Arctic Cat 2015 400 Service Manual Download

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Feeler Gauge Procedure

Using a feeler gauge, check each valve/tappet clearance.

If clearance is not within specifications, loosen the jam

nut and rotate the tappet adjuster screw until the clear-

ance is within specifications. Tighten each jam nut

securely after completing the adjustment.

CC007DC

Valve Adjuster Procedure

A. Place the Valve Clearance Adjuster onto the jam

nut securing the tappet adjuster screw; then rotate

the valve adjuster dial clockwise until the end is

seated in the tappet adjuster screw.

B. While holding the valve adjuster dial in place, use

the valve adjuster handle and loosen the jam nut;

then rotate the tappet adjuster screw clockwise

until friction is felt.

C. Align the valve adjuster handle with one of the

marks on the valve adjuster dial.

D. While holding the valve adjuster handle in place,

rotate the valve adjuster dial counterclockwise

until proper valve/tappet clearance is attained.



NOTE: Refer to the appropriate specifications in

Feeler Gauge Procedure sub-section for the proper
valve/tappet clearance.



NOTE: Rotating the valve adjuster dial counter-

clockwise will open the valve/tappet clearance by
0.05 mm (0.002 in.) per mark.

E. While holding the adjuster dial at the proper

clearance setting, tighten the jam nut securely

with the valve adjuster handle.

3. Place the two valve inspection covers with O-rings

into position; then tighten the covers securely.

4. Install the spark plug; then install the timing inspec-

tion plug.

Testing Engine

Compression

To test engine compression, use the following procedure.

1. Remove the high tension lead from the spark plug.

2. Using compressed air, blow any debris from around

the spark plug.

3. Remove the spark plug; then attach the high tension

lead to the plug and ground the plug on the cylinder

head well away from the spark plug hole.

4. Attach the Compression Tester Kit.



NOTE: The engine must be warm and the battery

must be fully charged for this test.

5. While holding the throttle lever in the full-open posi-

tion, crank the engine over with the electric starter

until the gauge shows a peak reading of 95-115 psi

(five to 10 compression strokes).

6. If compression is abnormally low, inspect the

following items.

A. Verify starter cranks engine over at normal speed

(approximately 400 RPM).

B. Gauge functioning properly.

C. Throttle lever in the full-open position.

D. Valve/tappet clearance correct.

E. Valve not bent or burned.

F. Valve seat not burned.



NOTE: To service valves, see Engine/Transmission.

7. Pour approximately 30 ml (1 fl oz) of oil into the

spark plug hole, reattach the gauge, and retest com-

pression.

8. If compression is now evident, service the piston

rings (see Engine/Transmission - Servicing Top Side

Components).

Spark Plug

A light brown insulator indicates that a plug is correct. A

white or dark insulator indicates that the engine may need

to be serviced or the carburetor may need to be adjusted.

To maintain a hot, strong spark, keep the plug free of car-

bon.

CAUTION

The feeler gauge must be positioned at the same angle
as the valve and valve adjuster for an accurate measure-
ment of clearance. Failure to measure the valve clear-
ance accurately could cause valve component damage.

VALVE/TAPPET CLEARANCE

Intake

0.076-0.127 mm (0.003-0.005 in.)

Exhaust

0.152-0.203 mm (0.006-0.008 in.)

! WARNING

Always wear safety glasses when using compressed
air.

Summary of Contents for 2015 400

Page 1: ...S E R V I C E M A N U A L www arcticcat com 400 ...

Page 2: ...d decals display the words Warning Caution Note and At This Point to emphasize important information The symbol WARNING identifies personal safety related information Be sure to follow the directive because it deals with the possibility of serious injury or even death A CAUTION identifies unsafe practices which may result in ATV related damage Follow the directive because it deals with the possibi...

Page 3: ...ft Side Components 48 Servicing Left Side Components 50 Installing Left Side Components 52 Right Side Components 52 Removing Right Side Components 53 Servicing Right Side Components 56 Installing Right Side Components 57 Center Crankcase Components 60 Separating Crankcase Halves 60 Disassembling Crankcase Half 61 Servicing Center Crankcase Components 62 Assembling Crankcase Half 67 Joining Crankca...

Page 4: ...stance trigger charging 90 110 ohms Less than 1 ohm Peak Voltage trigger 7 8 9 3 volts AC Generator Output no load 60 AC volts 3000 RPM Generator Output approx 220W 5000 RPM CRANKSHAFT Connecting Rod small end max 20 021 mm Connecting Rod big end side to side max 0 7 mm Connecting Rod big end width 21 95 22 00 mm Connecting Rod small end deflection max 3 0 mm Crankshaft web to web 60 9 mm Cranksha...

Page 5: ...e Ball Joint 35 47 Shock Absorber Frame 35 47 Shock Absorber Upper A Arm 35 47 Knuckle A Arm 35 47 SUSPENSION COMPONENTS Rear Shock Absorber Upper Frame 35 47 Shock Absorber Lower Lower A Arm 35 47 A Arm Frame 35 47 Knuckle A Arm 35 47 STEERING COMPONENTS Steering Post Bearing Housing Frame 20 27 Handlebar Cap Steering Post 20 27 Lower Steering Post Bearing Cap Screw Steering Post 40 54 Tie Rod En...

Page 6: ... to a warm area ft lb N m ft lb N m ft lb N m ft lb N m 1 1 4 26 35 4 51 69 4 76 103 4 2 2 7 27 36 7 52 70 7 77 104 7 3 4 1 28 38 1 53 72 1 78 106 1 4 5 4 29 39 4 54 73 4 79 107 4 5 6 8 30 40 8 55 74 8 80 108 8 6 8 2 31 42 2 56 76 2 81 110 2 7 9 5 32 43 5 57 77 5 82 111 5 8 10 9 33 44 9 58 78 9 83 112 9 9 12 2 34 46 2 59 80 2 84 114 2 10 13 6 35 47 6 60 81 6 85 115 6 11 15 36 49 61 83 86 117 12 16...

Page 7: ...e the bat tery clean the battery posts and cables and store in a clean dry area 9 Store the ATV indoors in a level position Preparation After Storage Taking the ATV out of storage and correctly preparing it will assure many miles and hours of trouble free riding Arctic Cat recommends the following procedure to pre pare the ATV 1 Clean the ATV thoroughly 2 Clean the engine Remove the cloth from the...

Page 8: ...rence A Throttle Lever Pivot Cable Ends B Brake Lever Pivot Cable Ends C Auxiliary Brake Cable Ends Air Filter CLEANING AND INSPECTING FILTER 1 Rotate the three locking tabs free of the lugs on the air filter cover then rotate the cover forward and away from the filter housing KC0056A KC147 2 Remove the foam filter element from the air filter housing and separate the foam element from the spring K...

Page 9: ...ation 3 Wipe any accumulation of oil or gas from the filter housing and drain Valve Tappet Clearance To check and adjust valve tappet clearance use the fol lowing procedure NOTE The seat left side and right side engine cov ers and gas tank must be removed for this proce dure 1 Remove the timing inspection plug and spark plug then remove the valve inspection covers for more detailed information see...

Page 10: ...h tension lead from the spark plug 2 Using compressed air blow any debris from around the spark plug 3 Remove the spark plug then attach the high tension lead to the plug and ground the plug on the cylinder head well away from the spark plug hole 4 Attach the Compression Tester Kit NOTE The engine must be warm and the battery must be fully charged for this test 5 While holding the throttle lever i...

Page 11: ...sen and remove the arrester KC334A 2 Using a suitable brush clean the carbon deposits from the screen taking care not to damage the screen NOTE If the screen or gasket is damaged in any way it must be replaced 3 Install the spark arrester assembly with gasket then secure with the cap screws Tighten to 48 in lb KC145 Adjusting Throttle Cable To adjust the throttle cable free play follow this proce ...

Page 12: ...mounting boss located on the front side of the transmission case and allow the filter to drain completely Install the plug and tighten securely 6 Using the adjustable Oil Filter Wrench and a suitable wrench remove the old oil filter NOTE Clean up any excess oil after removing the filter 7 Apply oil to a new filter seal ring and check to make sure it is positioned correctly then install the new oil...

Page 13: ...ve each fill plug KC0077A 2 Drain the lubricant into a drain pan by removing the drain plug from each ATV0082A 737 651B 3 After all the oil has been drained install the drain plugs and tighten to 45 in lb 4 Pour the appropriate amount of approved SAE 80W 90 hypoid gear lubricant into the filler hole 5 Install the fill plugs and tighten to 16 ft lb NOTE If the differential rear drive oil is contami...

Page 14: ... engaged turn the ignition switch to the ON position then shift the transmission into each of the gear positions and note that the gear position indicated on the LCD corre sponds to the gear position selected by the lever If the indicator does not correspond to the selected gear it will be necessary to test drive the ATV to determine if the gear position switch is faulty or the shift lever needs a...

Page 15: ...er screw before releas ing the brake lever pedal Repeat this procedure until no air bubbles are present AF637D PR377C NOTE During the bleeding procedure watch the appropriate reservoir very closely to make sure there is always a sufficient amount of brake fluid If low refill the reservoir before the bleeding procedure is continued Failure to maintain a sufficient amount of fluid in the reservoir w...

Page 16: ...t lb steel or 80 ft lb aluminum 6 Burnish the brake pads Burnishing Brake Pads Brake pads both main and auxiliary must be burnished to achieve full braking effectiveness Braking distance will be extended until brake pads are properly burnished To properly burnish the brake pads use the following procedure 1 Choose an area large enough to safely accelerate the ATV to 30 mph and to brake to a stop 2...

Page 17: ...riven pulley fixed face and push the movable face open allowing the V belt to drop down between the pulley faces approximately 3 4 in KC137 5 Pinching the V belt together in front of the driven pulley pull it forward and outward off the clutch shaft then remove it from the driven pulley KC136 6 Inspect the faces of the drive and driven pulleys for scoring pitting cracks or grooving then clean any ...

Page 18: ... KC141 4 Remove the cap screw from the fixed driven face then rotate the pulleys counterclockwise until the driven pulley faces are together 5 With the two alignment pins installed in the V belt housing and a new V belt cover gasket in place install the V belt cover Using the pattern shown secure with the cap screws tightened to 8 ft lb KC142A KC153A 6 Slide the auxiliary brake pedal fully onto th...

Page 19: ...tter pins not damaged or missing Front Body Panel Fender REMOVING 1 Remove the seat and both side panels 2 Remove the front rack then disconnect the head light running light connectors located on the frame KC224 NOTE Use a small screwdriver to disengage the tab connector allowing the connector assembly to be removed from the frame KC223 3 Remove the cap screws A then remove the rein stallable rive...

Page 20: ...rs and attach onto the frame KC210G KC224 3 Install the screws securing the front body to the front body supports then install the left side and right side footwell fasteners Do not tighten at this time 4 Place the gas tank cover into position and secure with the existing hardware then install the two cap screws securing the rear of the panel to the frame Tighten all cap screws and fasteners secur...

Page 21: ...rear body panel components with warm soap and water 2 Inspect side panels and rear body panel for cracks and loose rivets 3 Inspect threaded areas of all mounting bosses for stripping 4 Inspect for missing decals INSTALLING 1 Place the rear body panel fender in place on the ATV then secure with the cap screws on the side frame and the rear rack assembly Tighten all fasten ers securely KC317A KC320...

Page 22: ...e the outer tie rod ends from the knuckles at this time 5 Remove the cap screw securing the lower steering post to the bearing Account for a flat washer KC184B 6 Remove the steering post from the ATV CLEANING AND INSPECTING 1 Wash the tie rod ends in parts cleaning solvent Dry with compressed air Inspect the pivot area for wear Apply a low temperature grease to the ends 2 Inspect the tie rods for ...

Page 23: ...hreads install the tie rod ends into the lower steering post arm and tighten to 30 ft lb then install new cotter pins KC184A 4 Place the handlebar and caps in place on the steering post and with the handlebar correctly positioned tighten the cap screws to 20 ft lb KC0058 5 Install the steering post cover then install the front body panel fender LCD Gauge REPLACING 1 Remove the two screws securing ...

Page 24: ...from end to end and peel off the rubber 4 Using an adhesive solvent clean all glue residue from the handlebar INSTALLING 1 Apply a liberal amount of Handlebar Grip Adhesive to the inside of the new grip 2 Slide the grip onto the handlebar until it is fully seated with the smooth part of the grip facing up NOTE A quick firm push is required to seat the grip completely on the handlebar Install while...

Page 25: ...he two halves of the throttle control onto the handlebar and secure with the two machine screws ADJUSTING To adjust throttle cable free play see Periodic Mainte nance Adjusting Throttle Cable Steering Knuckles REMOVING AND DISASSEMBLING 1 Secure the ATV on a support stand to elevate the wheel then remove the wheel 2 Remove the wheel cap from the hub then remove the cotter pin from the nut 3 Remove...

Page 26: ...l the knuckle to the upper and lower ball joints and secure with the two cap screws Tighten to 35 ft lb KC313A 3 Install the tie rod end and secure with the nut Tighten to 30 ft lb then install a new cotter pin and spread the pin NOTE During assembling new cotter pins should be installed 4 Apply a small amount of grease to the hub splines 5 Install the hub assembly onto the splines of the shaft 6 ...

Page 27: ... NOTE Care must be taken not to allow the handle bar to turn while securing it NOTE The front wheels do not have to be removed to adjust the tie rod Also care should be taken not to disturb the handlebar position 6 Using a permanent marker of some type mark the center of each front tire at a height parallel to the belly panel AF789D 7 Measure the distance between the marks at a height parallel to ...

Page 28: ...muffler internally by shaking the muffler back and forth and listening for rattles or loose debris inside the muffler NOTE For additional details on cleaning the muf fler spark arrester see Periodic Maintenance Muf fler Spark Arrester INSTALLING MUFFLER 1 Using a new grafoil seal place the muffler into posi tion engaging the mounting lugs into the grommets then slide the muffler forward 2 Install ...

Page 29: ... boot making sure it seals completely on the headlight harness KC146 TAILLIGHTS BRAKELIGHTS To replace a taillight brakelight bulb use the following procedure 1 Turn the bulb socket assembly counterclockwise and remove from the housing KC157 2 Press in and turn the bulb counterclockwise to remove Press in and turn clockwise to install the bulb 3 Insert the bulb socket assembly into the housing and...

Page 30: ...iming sur face wall or similar aiming surface ATV 0070C NOTE There should be an average operating load on the ATV when adjusting the headlight aim 2 Measure the distance from the floor to the mid point of each headlight 3 Using the measurements obtained in step 2 make horizontal marks on the aiming surface 4 Make vertical marks which intersect the horizontal marks on the aiming surface directly in...

Page 31: ...n replace lug nuts wheel studs 4 Replace bearing 5 Replace tighten tie rod ends 6 Replace tires 7 Replace bushings 8 Tighten bolts nuts Problem Steering pulling to one side Condition Remedy 1 Tires inflated unequally 2 Front wheel alignment incorrect 3 Wheel hub bearings worn broken 4 Frame distorted 5 Shock absorber defective 1 Adjust pressure 2 Adjust alignment 3 Replace bearings 4 Repair replac...

Page 32: ... break in period The first 10 hours or 200 miles are most critical to the life of this ATV Proper operation during this break in period will help assure maximum life and performance from the ATV Instruct the customer to follow the proper break in procedure as described in the Operators Manual SPECIAL TOOLS A number of special tools must be available to the techni cian when performing service proce...

Page 33: ...een valve screen 4 Replace valve Problem Engine stalls easily Condition Remedy 1 Spark plug fouled 2 Magneto defective 3 CDI unit defective 4 Valve clearance out of adjustment 5 Carburetor jets obstructed 1 Clean plug 2 Replace stator coil 3 Replace CDI unit 4 Adjust clearance 5 Clean jets Problem Engine noisy Excessive valve chatter Condition Remedy 1 Valve clearance excessive 2 Valve spring s we...

Page 34: ...4 Cam rocker arms tappets worn 5 Spark plug gap too narrow 6 Ignition coil defective 7 Float level too low 8 Air cleaner element obstructed 9 Fuel hose obstructed 1 Shift into higher gear decrease speed 2 Replace springs 3 Correct timing check chain sprockets and cam chain ten sioner 4 Replace cam arms tappets 5 Adjust gap 6 Replace ignition coil 7 Adjust float height 8 Clean element 9 Clean or re...

Page 35: ...defective 5 Oil circuit obstructed 6 Intake manifold leaking air 7 Fan malfunctioning 8 Fan switch malfunctioning 9 Gasoline level in float chamber too low 1 Clean piston 2 Add oil 3 Drain replace gasoline 4 Replace pump 5 Clean circuit 6 Tighten replace manifold 7 Check fan fuse replace fan 8 Replace fan switch 9 Adjust float height ...

Page 36: ...nd cooling fan connector KC251 KC250 KC249 4 Disconnect the speedometer sensor then remove the E clip securing the shift rod to the shift arm and discon nect the shift rod Account for a bushing and flat washer KC248 KC255 5 Remove the inlet air duct air filter housing and air silencer duct then remove the carburetor and set aside leaving the throttle cable attached AT THIS POINT If the technician ...

Page 37: ...seal and seal ring KC170 KC238 7 Disconnect the gear position switch starter cable and engine ground cable then disconnect the trigger coil and stator coil connectors KC228C KC228B 8 Remove the front and rear V belt cooling boots from the V belt housing 9 Remove the cap screws from the front and rear out put flanges then remove the front and rear engine mounting through bolts KC242 KC243 ...

Page 38: ...ate the crankshaft to top dead cen ter of the compression stroke NOTE Arctic Cat recommends the use of new gas kets lock nuts and seals and lubricating all internal components when servicing the engine transmis sion 1 Remove the cap screws securing the two valve inspection covers Remove the two covers Account for the O rings MD1264 NOTE Keep the mounting hardware with the covers for assembly purpo...

Page 39: ...sprocket off the camshaft While holding the cam chain slide the sprocket and camshaft out of the cyl inder head Account for an alignment pin NOTE Loop the chain over the cylinder and secure it to keep it from falling into the crankcase MD1132 7 Remove the cam chain tensioner by lifting it from the chain cavity then remove the two lower nuts securing the cylinder head to the cylinder one in front a...

Page 40: ...nt pins MD1214 13 Using an awl remove the piston pin circlips Take care not to drop them into the crankcase MD1213 14 Using Piston Pin Puller remove the piston pin Account for the opposite side circlip Remove the piston NOTE It is advisable to remove the opposite side circlip prior to using the puller MD1219 AT THIS POINT To service valves and cylinder head see Servicing Top Side Components sub se...

Page 41: ...il a uniform bright metallic finish is attained CC130D Removing Valves NOTE Keep all valves and valve components as a set Note the original location of each valve set for use during installation Return each valve set to its original location during installation 1 Using a valve spring compressor compress the valve springs and remove the valve keepers Account for an upper spring retainer CC994 2 Rem...

Page 42: ...f the spring facing away from the cylinder head NOTE If the paint is not visible install the ends of the springs with the closest wound coils toward the head ATV 1011A 4 Place a spring retainer over the valve springs then using the valve spring compressor compress the valve springs and install the valve keepers CC994 PISTON ASSEMBLY NOTE Whenever a piston rings or pin are out of tolerance they mus...

Page 43: ...st be replaced see Center Crankcase Components in this section 3 Insert an inside dial indicator into the piston pin bore Take two measurements to ensure accuracy The diameter must not exceed specifications If the diameter exceeds specifications the piston must be replaced ATV 1069 Measuring Piston Skirt Cylinder Clearance 1 Measure the cylinder front to back in six places CC397D 2 Measure the cor...

Page 44: ...ttained Measuring Cylinder Head Distortion 1 Remove any carbon buildup in the combustion chamber 2 Lay a straightedge across the cylinder head then using a feeler gauge check the distortion between the head and the straightedge 3 Maximum distortion must not exceed specifications CC141D Cleaning Inspecting Cylinder 1 Wash the cylinder in parts cleaning solvent 2 Inspect the cylinder for pitting sco...

Page 45: ...ne NOTE To produce the proper 60 cross hatch pat tern use a low RPM drill 600 RPM at the rate of 30 strokes per minute If honing oil is not available use a lightweight petroleum based oil Thoroughly clean cylinder after honing using soap and hot water Dry with compressed air then immediately apply oil to the cylinder bore If the bore is severely damaged or gouged replace the cylinder CC390D 4 If a...

Page 46: ...ston on the connecting rod making sure there is a circlip on each side NOTE The piston should be installed so the arrow points towards the exhaust MD1213 2 Place the two alignment pins into position Place a new cylinder gasket into position then place a piston holder or suitable substitute beneath the piston skirt and square the piston in respect to the crankcase MD1344 3 Lubricate the inside wall...

Page 47: ...nto position on the cylinder making sure the cam chain is routed through the chain cavity MD1347 MD1163 7 Install the four cylinder head cap screws with wash ers Note that the two cap screws on the right side of the cylinder head nearest the cam sprocket are longer than the two cap screws on the left spark plug side Tighten only until snug MD1270 8 Install the two lower nuts securing the cylinder ...

Page 48: ...installed in the camshaft loosely place the cam sprocket with the recessed side facing the camshaft lobes onto the camshaft and place it into position with the cam chain over the sprocket MD1359 14 Place the C ring into position in its groove in the cyl inder head MD1131 NOTE At this point oil the camshaft bearings cam lobes and the three seating journals on the cylinder head NOTE Note the positio...

Page 49: ...e tab to secure the cap screw 20 Install the cylinder head plug with the cupped end facing the camshaft and the opening directed down wards 21 Remove the cap screw from the end of the chain ten sioner Account for the plunger spring and gasket MD1248 22 Depress the spring loaded lock and push the plunger into the tensioner MD1146 23 Place the cam chain tensioner assembly and gasket into the cylinde...

Page 50: ... install the timing inspection plug Left Side Components NOTE For efficiency it is preferable to remove and disassemble only those components which need to be addressed and to service only those components The technician should use discretion and sound judgment NOTE The engine transmission does not have to be removed from the frame for this procedure Removing Left Side Components A Cover Stator As...

Page 51: ...tor NOTE Steps 1 3 in the preceding sub section must precede this procedure 4 Remove the rotor flywheel nut MD1194 5 Install the crankshaft protector MD1365 6 Using Magneto Rotor Remover break the rotor fly wheel assembly loose from the crankshaft Remove the remover the crankshaft protector the rotor fly wheel and the starter clutch gear Account for the key MD1368 MD1369 CAUTION Care must be taken...

Page 52: ...laced as an assembly 13 Using an impact screwdriver remove the three Phil lips head screws holding the crankshaft bearing retainer Remove the crankshaft bearing retainer MD1122 Servicing Left Side Components INSPECTING STARTER CLUTCH GEAR 1 Place the starter clutch gear onto the rotor flywheel and attempt to rotate the starter clutch gear clock wise It should lock up to the rotor flywheel Rotate t...

Page 53: ...h the cap screws after applying a drop of red Loctite 271 to the threads Tighten to 26 ft lb using a crisscross pattern Make sure the one way bearing is installed with the notches directed away from the rotor flywheel FI576A FI578 REPLACING STARTER GEAR BEARING 1 Support the starter clutch gear in a press making sure to support the hub around the entire circumference then using a suitable bearing ...

Page 54: ...ace over the crank shaft Tighten the nut to 107 ft lb C Cover NOTE Steps 1 7 in the preceding sub section must precede this procedure 8 Install two alignment pins and place the left side cover gasket into position Install the left side cover Noting the different lengthed 6 mm cap screws the position of the shifter bracket and the location of the long cap screw with the washer tighten cap screws in...

Page 55: ...slide the brake pedal outward and remove the V belt cover Account for two align ment pins and a gasket KC142A 3 Mark the movable drive face and the fixed drive face for installing purposes then remove the nut holding the movable drive face onto the crankshaft MD1033 4 Remove the movable drive face and spacer Account for the movable drive face rollers and outer drive face cover MD1035 MD1034 MD1036...

Page 56: ...half Note the positions of the different lengthed cap screws for installing pur poses 10 Using a rubber mallet loosen the clutch cover then pull it away from the right side crankcase half Account for two alignment pins and gasket MD1115 D Centrifugal Clutch Assembly E Oil Pump Drive Gear F Oil Pump Driven Gear G Oil Pump NOTE Steps 1 10 in the preceding sub section must precede this procedure KC32...

Page 57: ...ft hand threaded nut holding the cen trifugal clutch assembly MD1014 MD1016 13 Remove the cam chain MD1335 14 Remove the oil pump drive gear cap screw MD1018 15 Remove oil pump drive gear Account for the pin MD1017 16 Remove the snap ring holding the oil pump driven gear CAUTION Care must be taken when removing the nut it has left hand threads ...

Page 58: ...the complete set ATV1014 INSPECTING CENTRIFUGAL CLUTCH HOUSING 1 Inspect the clutch housing for burns marks scuffs cracks scratches or uneven wear 2 If the housing is damaged in any way the housing must be replaced INSPECTING PRIMARY ONE WAY DRIVE 1 Place the one way clutch onto the clutch shoe assem bly with the green dot or the word OUTSIDE directed away from the clutch shoe KC330 2 Place the cl...

Page 59: ...y assembly is a non service able component and must be replaced as a complete assembly Installing Right Side Components A Oil Pump 1 Place two alignment pins and the oil pump into posi tion on the crankcase and secure with the Phil lips head screws coated with blue Loctite 243 Tighten to 8 ft lb MD1060 2 Place the thrust washer and drive pin into position on the oil pump shaft install the oil pump...

Page 60: ...ay from the crankcase MD1286 KC325A KC326B B Clutch Cover C Fixed Drive Face D Movable Drive Face NOTE Steps 1 6 in the preceding sub section must precede this procedure 7 Install two alignment pins and place the clutch cover gasket into position Install the clutch cover MD1115 8 Tighten the clutch cover cap screws to 8 ft lb CAUTION Care must be taken when installing the flange nut it has left ha...

Page 61: ...reading a V belt cover cap screw into the fixed driven face and tightening until the faces open sufficiently to allow the V belt to drop into the pulley approximately 3 4 in KC137 NOTE The arrows on the V belt should point in direction of engine rotation 13 Making sure the movable drive face rollers are in position pinch the V belt together near its center and slide the spacer and movable drive fa...

Page 62: ...e must precede this procedure NOTE For efficiency it is preferable to remove and disassemble only those components which need to be addressed and to service only those components The technician should use discretion and sound judgment Separating Crankcase Halves 1 Remove the left side and right side cap screws securing the crankcase halves noting the position of the different sized cap screws for ...

Page 63: ... sleeve Account for the washer MD1325 3 Remove the driveshaft MD1326 4 Remove the shift fork shaft and the outer shift fork MD1327 5 Remove snap ring and gear from the output side of the gear cluster Remove the gear cluster and the inner shift fork together Account for snap ring gear and washer MD1328 6 Noting the position of the slot on the end remove the shift cam assembly Account for inner and ...

Page 64: ...ection is necessary 1 If backlash measurement is less than specified remove an existing shim measure it and install a new thinner shim 2 If backlash measurement is more than specified remove an existing shim measure it and install a thicker shim NOTE Continue to remove measure and install until backlash measurement is within tolerance Note the following chart Checking Tooth Contact NOTE After corr...

Page 65: ...0D 2 Maximum diameter must not exceed specifications Measuring Connecting Rod Small End Deflection 1 Place the crankshaft on a set of V blocks and mount a dial indicator and base on the surface plate Position the indicator contact point against the center of the connecting rod small end journal 2 Zero the indicator and push the small end of the con necting rod away from the dial indicator 3 Maximu...

Page 66: ...wing steps 3 4 Measuring Crankshaft Web to Web 1 Using a calipers measure the distance from the out side edge of one web to the outside edge of the other web KC513 2 Acceptable width range must be within specifica tions COUNTERSHAFT Disassembling 1 Remove the reverse driven gear dog then remove the circlip securing the reverse driven gear FI663 FI664 2 Remove the splined washer then remove the rev...

Page 67: ... Remove the slid ing dog FI668 FI669 5 Remove the circlip securing the high driven gear then remove a washer the high driven gear along with the bearing and bushing and remove the high driven washer FI670 FI671 Assembling 1 With the high driven washer 1 on the countershaft install the high driven gear bushing 3 bearings 2 and gear 4 on the countershaft then install the washers 5 and secure with th...

Page 68: ...ow driven bushing 10 bearing 9 and gear 11 on the countershaft then install splined washer 12 FI667A FI666 4 Place the reverse driven bushing 13 onto the shaft then install the bearing 14 gear 15 and splined washer 16 Secure with a snap ring FI665A FI664 5 Install the reverse dog on the shaft then place the shift forks and shift shaft into position FI663 ...

Page 69: ...h peen the nut MD1333 3 Apply a liberal amount of oil to the crankshaft bear ing Using a propane torch heat the bearing until the oil begins to smoke then slide the crankshaft assem bly into place MD1334 NOTE If heating the bearing is not possible the crankshaft can be installed using a crankshaft installer 4 Rotate the crankshaft so the counterweight is toward the rear of the engine Install the c...

Page 70: ...an assembly FI662 FI653 8 Align the shift forks to allow engagement with the shift cam then engage the shift forks and slide the shift fork shaft into the locating boss in the crankcase FI653A FI655A 9 Install the input driveshaft FI646 10 Install the spacer 1 shaft 2 reverse idler gear and washer 3 FI641A FI645 ...

Page 71: ...lves together until cap screws can be installed 3 From the right side install the crankcase cap screws noting the location of the different sized cap screws then tighten only until snug NOTE Rotate the shafts back and forth to ensure no binding or sticking occurs while tightening the cap screws MD1008 4 From the left side install the remaining crankcase cap screws then tighten only until snug NOTE...

Page 72: ...hten to 38 ft lb 3 Align the front and rear output flanges with the drive couplers then secure with the screws and tighten to 20 ft lb KC242 KC243 4 Install the front and rear V belt cooling boots and secure with the existing hardware KC235 KC236 5 Connect the stator coil trigger coil and gear position switch connectors then attach the engine ground cable and starter cable and secure with cap scre...

Page 73: ...ke pipe being care ful to align the lug on the carburetor with the align ment tabs on the air intake pipe then tighten the clamp securely KC245A 8 Install the air filter housing onto the frame then con nect the inlet air duct air silencer duct and intake housing to carburetor boot and tighten all hose clamps securely KC254 9 Install the shift rod onto the shift arm with bushing and flat washer and...

Page 74: ...dal and secure with a flat washer and cap screw Tighten to 20 ft lb KC232A KC149A 12 Install the heat shield then install the gas tank see Fuel Lubrication Cooling Gas Tank 13 Install the front body panel front rack and foot wells 14 Pour the appropriate quantity and grade oil into the crankcase then connect the negative battery cable and move the ATV outside to a well ventilated area 15 Start the...

Page 75: ...Inspect the plunger A for scoring or scratches the needle B for damage to the tip the spring C for breakage and the O ring D for breaks KC328A 2 With the choke at room temperature approximately 70 F measure plunger extension Measurement A should be 18 6 19 1 mm KC328B 3 Connect Electric Choke Test Harness to the choke connector and a suitable 12 DC volt power supply for 2 3 minutes Disconnect the ...

Page 76: ... The carburetor can now be removed for service KC258A WARNING Whenever any maintenance or inspection is performed on the fuel system during which there may be fuel leak age there should be no welding smoking open flames etc in the area KEY 1 Cover 2 Screw 3 Spring 4 Vacuum Piston 5 Spring Seat 6 Jet Needle 7 Needle Jet 8 Jet Holder 9 Main Jet 10 Slow Jet 11 Starter Jet 12 Float Valve 13 Clip 14 Fl...

Page 77: ...three screws securing the pump housing Account for the diaphragm assembly spring and U ring in the housing CC748 4 Remove the Phillips head screws securing the float chamber then remove the chamber Account for the O ring KC0022A KC0063A 5 Remove the float pin KC0024A 6 Lift the float assembly from the carburetor Account for the float valve and clip KC0025A NOTE Note the locations of the jets pilot...

Page 78: ...t ing 6 Inspect the vacuum piston diaphragm for cracks imperfections in the casting or cracks and tears in the rubber 7 Inspect float for damage 8 Inspect gasket and O rings for distortion tears or noticeable damage 9 Inspect tips of the jet needle pilot screw and the needle jet for wear damage or distortion 10 Inspect the slow jet and main jet for obstructions or damage NOTE If the slow jet is ob...

Page 79: ...all the main jet into the needle jet holder and tighten securely then install the needle jet and nee dle jet holder assembly into the carburetor and tighten securely KC0031 KC0030A 5 Place the float assembly with float valve into posi tion and secure to the carburetor with the float pin KC0024 NOTE Check float height by placing the carburetor on its side w float contacting the needle then mea sure...

Page 80: ...eedle spring seat and spring into the vacuum piston then place the assembly down into the carburetor CC746 9 Place the top cover into position then secure with the Phillips head screws Tighten securely KC0019A INSTALLING 1 Connect the vent hose to the carburetor then connect the electronic choke connector and install the throttle cable onto the throttle arm CAUTION It is important to press down on...

Page 81: ...sure the alignment lug on the carburetor is between the two tabs on the air intake pipe then tighten the clamp securely KC245A KC256A 4 Connect the intake air housing and tighten all clamps and mounting hardware securely KC257 5 Install the gas tank see Gas Tank in this section Throttle Cable Free Play To adjust throttle cable free play see Periodic Mainte nance Engine RPM Idle To adjust the idle ...

Page 82: ...remove gas tank cover and place the tank cap back on the tank KC220 5 Using suitable straps hook the body panel at the rear of the gas tank and route it over the handlebar to the front rack then pull it tight to spread open the panel at the rear of the gas tank KC509A 6 Remove the fuel shut off valve knob KC515A 7 Remove the cap screw A securing the gas tank to the frame then unplug the fuel level...

Page 83: ...e making sure the heat shield is in position KC252A 2 Using a suitable block support the rear of the tank and connect the gasline hose Secure with the clamp KC241A 3 Remove the block and slide the tank forward con nect the fuel level sensor wires and insert the cap screw into the rear of tank Tighten securely KC514 4 Remove the straps then using the existing cap screws install the instrument pod T...

Page 84: ... in diagnostic mode and select tACH 2 Connect the Oil Pressure Test Kit to the oil filter drain plug KC195A KC267 NOTE Some oil seepage may occur when installing the oil pressure gauge Wipe up oil residue with a cloth 3 Warm up the engine to normal operating temperature cooling fan cycling then increase engine RPM to 3000 RPM The oil pressure must read 1 1 1 7 kg cm2 16 25 psi KC268 NOTE If the oi...

Page 85: ...etor leaking air 4 Gas contaminated 1 Clean jet 2 Clean passage 3 Replace gasket 4 Drain gas tank and fill with clean gas Problem Idling or low speed impaired Condition Remedy 1 Slow jet obstructed loose 2 Slow jet outlet obstructed 3 Low speed fuel screw setting incorrect 4 Float height incorrect 1 Clean tighten jet 2 Clean outlet 3 Adjust screw 4 Adjust float height Problem Medium or high speed ...

Page 86: ...ed by ambient temper ature ignition OFF current draw corroded terminals self discharge frequent start stops and short engine run times Frequent winch usage snowplowing extended low RPM operation short trips and high amperage accessory usage are also reasons for battery discharge Maintenance Charging NOTE Arctic Cat recommends the use of the CTEK Multi US 800 or the CTEK Multi US 3300 for battery m...

Page 87: ...nates If the battery becomes hot to the touch stop charging Resume after it has cooled 7 Once the battery has reached full charge unplug the charger from the 110 volt electrical outlet NOTE If after charging the battery does not perform to operator expectations bring the battery to an autho rized Arctic Cat dealer for further troubleshooting RPM Limiter NOTE The ATV is equipped with a CDI unit tha...

Page 88: ...of 140 C 284 F the meter should read an open circuit 5 On the cooling fan switch when the temperature reaches 120 C 248 F the meter should read a closed circuit 6 On the cooling fan switch allow the oil to cool and when the temperature is at or just before a tempera ture of 110 C 230 F the meter should read an open circuit 7 If the readings are not as indicated the switch must be replaced 8 Apply ...

Page 89: ...nnector terminals individually 5 The meter must show battery voltage from one side of the connector terminal ends NOTE Battery voltage will be indicated from only one side of the fuse holder connector terminal the other side will show no voltage NOTE When testing the HI fuse holder the head light dimmer switch must be in the HI position when testing the LIGHTS fuse holder the headlight dimmer swit...

Page 90: ...es not read as specified replace the spark plug cap PEAK VOLTAGE NOTE All of the peak voltage tests should be made using the Fluke Model 73 Multimeter or Fluke Model 77 Multimeter with Peak Voltage Reading Adapter If any other type of tester is used readings may vary due to internal circuitry NOTE The battery must be at full charge for these tests Primary CDI NOTE The CDI is located on the electri...

Page 91: ...Switch The ignition switch harness connects to the switch with a three pin connector To access the connector remove the access panel in front of the handlebar KC339D VOLTAGE NOTE Perform this test on the main harness con nector 1 Set the meter selector to the DC Voltage position 2 Connect the red meter lead to the red white wire then connect the black meter lead to ground 3 Meter must show battery...

Page 92: ...nnect the other tester wire to the green red wire The meter must show less than 1 ohm 3 Depress and hold the reverse override button The meter must show an open circuit NOTE If the meter does not show as specified replace the switch Gear Position Switch The gear position switch connector is located on the right side of the engine over the V belt housing KC227A To troubleshoot the switch use the fo...

Page 93: ...ing must be within specification Starter Relay 1 Remove the seat then using the multimeter set to the DC Voltage position check the relay as follows 2 Connect the red tester lead to the positive battery ter minal then connect the black tester lead to the starter cable connection on the starter relay The meter must show battery voltage NOTE Make sure that the ignition switch is in the ON position t...

Page 94: ...ive it is advisable to perform a CDI peak voltage test see Ignition Coil in this section and or perform a continuity test of the wiring harness from the CDI connector to the CDI unit Regulator Rectifier The regulator rectifier is located under the front rack and front fenders above the oil cooler TESTING 1 Start engine and warm up to normal operating tem peratures then connect a multimeter to the ...

Page 95: ...ng harness TAILLIGHTS BRAKELIGHTS Voltage Taillights NOTE Perform this test on the main harness side of the connector Also the ignition switch should be in the LIGHTS position 1 Set the meter selector to the DC Voltage position 2 Connect the black tester lead to the black wire then connect the red tester lead to the brown blue wire 3 The meter must show battery voltage NOTE If the meter does not s...

Page 96: ...t 5 Replace stator coil Problem Spark plug fouled with carbon Condition Remedy 1 Gasoline incorrect 2 Air cleaner element dirty 3 Spark plug incorrect too cold 4 Valve seals cracked missing 5 Oil rings worn broken 6 Mixture too rich 7 Idling RPM too high 1 Change to correct gasoline 2 Clean element 3 Replace plug 4 Replace seals 5 Replace rings 6 Replace jets with correct size 7 Adjust carburetor ...

Page 97: ...y 5 Turn on switches 6 Connect tighten repair connections Problem Battery sulfation Acidic white powdery substance or spots on surfaces of cell plates Condition Remedy 1 Charging rate too low too high 2 Battery run down damaged 3 Electrolyte contaminated 4 Battery electrolyte insufficient 5 Specific gravity too low 1 Repair charging system 2 Replace battery 3 Replace battery 4 Keep electrolyte to ...

Page 98: ...ke lever lock 7 Remove the upper and lower ball joint cap screws taking care not to strip the threads AF628D 8 Pull the steering knuckle away from the axle taking care not to damage the seals as the axle clears the knuckle KC314 9 Support the axle to not allow it to drop or hang 10 Pull out on the axle until completely extended then push it back in approximately one half inch and pull out sharply ...

Page 99: ...ion and sound judgment 1 Remove the cap screws securing the front drive actu ator and remove the actuator CD102 2 Remove the cap screws securing the pinion housing then using a rubber mallet remove the housing Account for a gasket Note the location of all the components for assembling purposes 3 Using a side cutter remove the boot clamps then remove the boots and splined drive from the input shaft...

Page 100: ...l making sure it is flush with the edge of the housing 3 Lubricate the input shaft splines with High Perfor mance 2 Molybdenum Disulphide Grease NOTE Any time drive splines are separated clean all splines with parts cleaning solvent and dry with compressed air then lubricate with recommended grease KX221 KX222 4 Install the input shaft into the housing then install the front boot and secure with a...

Page 101: ...ling purposes KX173 3 Using a plastic mallet tap lightly to remove the dif ferential cover Account for an O ring and a shim NOTE If the cover is difficult to remove pry on the cover in more than one recessed location GC063 4 Place the differential with the open side down then lift the housing off the spider assembly Account for shim s and mark as right side KX179 KX181 5 Unstake the lock collar th...

Page 102: ...se tolerances therefore it is very impor tant to properly adjust any gear set prior to final assem bly The following procedure can be used on both front differ ential or rear drive gear case NOTE All bearings must be installed in the gear case and the pinion properly installed before pro ceeding Backlash NOTE Always set backlash prior to any other shim ming 1 Install the existing shim or a 0 051 0...

Page 103: ...uge at a 90 angle and on the index mark GC070 GC072A 6 Zero the dial indicator then while holding the pinion stationary rock the ring gear assembly forward and back and record the backlash Backlash must be 0 011 0 015 in If backlash is within specifications proceed to Ring Gear End Play If backlash is not within specifications increase shim thickness to increase backlash or decrease shim thickness...

Page 104: ... the thrust button with shim into the gear case cover and tighten securely left hand threads GC057A 2 Place the ring gear with selected shim into the cover and measure the ring gear to thrust button clearance with a thickness gauge Clearance should be 0 002 0 004 in GC058A 3 If clearance is as specified remove the ring gear and thrust button then place a drop of red Loctite 271 on the threads and ...

Page 105: ...hten to 18 ft lb CD110 Removing Needle Bearing NOTE Removing the needle bearing is rarely nec essary Avoid removing the needle bearing unless the bearing is clearly damaged NOTE This procedure can be performed on a rear gear case 1 Place a 1 4 in drill bit on the inside surface of the needle bearing against the bottom side then drill through the pinion shaft needle bearing housing CC885 2 Using a ...

Page 106: ... to 125 ft lb CC890 4 Place a punch on the edge of the lock collar in the oil gallery area then using a hammer stake the lock col lar to ensure that the collar will remain securely tightened CC891 5 Install the pinion housing Removing Installing Axle Seal NOTE This procedure can be performed on a rear gear case 1 Remove the seal using a seal removal tool GC066 2 Using a press remove the bearing CC...

Page 107: ...install the cap screws and nuts Tighten to 38 ft lb KC488 2 Install the cap screws securing the flange couplers together and tighten to 20 ft lb AG925 3 Install the front axles AF610D AF897D 4 Install the wheels and tighten to 40 ft lb steel or 80 ft lb aluminum 5 Pour 275 ml 9 3 fl oz of SAE 80W 90 hypoid gear lubricant into the differential and install the filler plug Tighten to 16 ft lb 6 Remov...

Page 108: ...ve axle into place in the gear case NOTE To assure proper seating of the axle give it a light pull the axle should remain clipped in place 2 Swing the knuckle up and onto the drive axle then place the knuckle into place in the upper A arm Secure the knuckle to the A arm with a cap screw and a new lock nut Tighten to 35 ft lb 3 Place the hub into position on the axle followed by a hex nuts Tighten ...

Page 109: ...into position through the left side of the frame then secure it to the frame with cap screws and lock nuts Tighten to 38 ft lb 2 Secure the engine output flange to the rear gear case input flange with four cap screws and lock nuts Tighten to 20 ft lb 3 Install the rear drive axles Hub REMOVING 1 Secure the ATV on a support stand to elevate the wheel then remove the wheel 2 Remove the cotter pin fr...

Page 110: ...as an assembly REMOVING 1 Slide a piece of flexible tubing over one of the wheel bleeder valves and direct the other end into a con tainer Remove the reservoir cover then open the bleeder valve Allow the brake fluid to drain com pletely NOTE Compressing the brake lever several times will quicken the draining process AF637D 2 Place an absorbent towel around the connection to absorb brake fluid Remo...

Page 111: ...ad then remove the inner brake pad NOTE If brake pads are to be returned to service do not allow brake fluid to contaminate them PR237A PR238 5 Remove the caliper holder from the caliper and dis card the O ring PR239B NOTE The O ring is used for shipping purposes and provides no function in operation 6 Cover the piston end of the housing with a shop towel then keeping fingers clear of piston trave...

Page 112: ...spect the piston surface for scoring discoloration or evidence of binding or galling 5 Inspect the caliper holder for wear or bending ASSEMBLING INSTALLING 1 Install new seals into the brake caliper housing and apply a liberal amount of DOT 4 brake fluid to the cylinder bore of the housing seals and brake piston PR715 PR717A 2 Press the piston into the caliper housing using hand pressure only Comp...

Page 113: ...se fitting and install it on the caliper Tighten to 20 ft lb 8 Fill the reservoir then bleed the brake system see Periodic Maintenance Hydraulic Brake Systems 9 Install the wheel Tighten to 40 ft lb steel or 80 ft lb aluminum 10 Remove the ATV from the support stand and verify brake operation CAUTION If brake pads become contaminated with brake fluid they must be thoroughly cleaned with brake clea...

Page 114: ... coupling 4 Replace joint 5 Replace gear s 6 Replace gears pinions 7 Replace gear s 8 Replace axle 9 Replace axle Problem Braking poor Condition Remedy 1 Pad worn 2 Pedal free play excessive 3 Brake fluid leaking 4 Hydraulic system spongy 5 Master cylinder brake cylinder seal worn 1 Replace pads 2 Replace pads 3 Repair replace hydraulic system component s 4 Bleed hydraulic system correct or repair...

Page 115: ...r assembly must be replaced INSTALLING 1 Place bushings and sleeves where appropriate into shock eyelet then install shock with cap screws and nuts Tighten all nuts to 35 ft lb 2 Remove the ATV from the support stand Front A Arms REMOVING 1 Secure the ATV on a support stand to elevate the front wheels then remove the wheels 2 Remove the cotter pin from the nut Discard the cot ter pin 3 Remove the ...

Page 116: ...drive axle 7 Secure the hub assembly with the nut Tighten only until snug 8 Secure the brake caliper to the knuckle with the two patch lock cap screws Tighten to 20 ft lb 9 Secure the hub nut from step 7 to the shaft axle Tighten to 200 ft lb 10 Install a new cotter pin and spread the pin to secure the nut 11 Install the wheel and tighten to 40 ft lb steel or 80 ft lb aluminum 12 Remove the ATV fr...

Page 117: ... nut Tighten to 35 ft lb 11 Secure the boot guard to the lower A arm with the two cap screws Tighten securely 12 Install the wheel and tighten to 40 ft lb steel or 80 ft lb aluminum 13 Remove the ATV from the support stand Wheels and Tires TIRE SIZE The ATV is equipped with low pressure tubeless tires of the size and type listed in the General Information sec tion Do not under any circumstances su...

Page 118: ...5 Increase the air pressure in the tires with the smallest circumference measurement until all tires are equal in circumference 6 Repeat steps 4 5 as necessary to ensure proper han dling Troubleshooting WARNING Do not operate the ATV if tire damage exists Problem Suspension too soft Condition Remedy 1 Spring s weak 2 Shock absorber damaged 3 Shock absorber preload too low 1 Replace spring s 2 Repl...

Page 119: ...Printed in U S A Trademarks of Arctic Cat Inc Thief River Falls MN 56701 p n 2260 382 ...

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Arctic Cat 2015 400, Service Manual

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Summary of Contents for 2015 400

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