SCORPION 1975 Brut Service Manual Download

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Summary of Contents for 1975 Brut

Page 1: ... J 1975 Scorpion Brut Service Manual Engine Section 1 l ...

Page 2: ...efore it is necessary to know something about the basic fundamentals of this engine and how it functions OPERATION The Scorpion Brut engine uses a mixture of gasoline oil and air for combustion lubrication and cooling It fires on every stroke of each piston There are two or three power strokes depending on the model for every revolution of the crankshaft As the piston moves upward in the cylinder ...

Page 3: ...ges the combustion area giving it a fresh charge and the cycle is then repeated Fig 1 lD Because lubrication is dependent on the mixing of oil and fuel it is extremely important that good quality oil and gasoline are properly mixed The proper ratio of oil to gasoline will prevent possible engine overheating piston or cylinder scoring or eventual engine seizure Too much oil and not enough gasoline ...

Page 4: ...m 20Ft lbs Exhaust Manifold Nuts 8mm 20Ft lbs Water Manifold Nuts 6mm 15Ft lbs Crankcase Bolts 8mm 20Ft lbs 10 mm 25Ft lbs CRANKCASE BOLTS TORQUE SEQUENCE 20 10 mm Bolts Circled 15 11 7 3 1 6 10 14 All others are e18 16 17 13 9 5 2 4 8 12 19 440 Brut is shown Use the same torquing pattern for the 340 Brut which has 12 instead of 18 8 mm bolts CYLINDER HEAD NUT TORQUING SEQUENCE 340 440 Models 1 4 ...

Page 5: ...or outlet 2 Remove the 3 8 nuts which fasten the tie rod ends to the steering frog Remove the cotter key from the lower end of the steering frog Remove the 2lf4 bolts which secure the upper steering brack et to the roll bar SERVICE MANUAL 1975 SCORPION BRUT CLAMPS FIG 1 2 CARB ELBOW MOUNTING SCREWS FIG 1 3 STEERING FROG TIE RODS l 5 ...

Page 6: ...the steering post clear of the engine area UPPER STEERING BRACKET 3 Disconnect the engine electrical connectors spark plug leads and the temperature light wire from th heat sensing element SENSING ELEMENT CONNECTOR 1 6 FIG 1 4 FIG 1 5 FIG 1 6 ...

Page 7: ... 4 Disconnect the coolant hoses from the manifolds and plug both manifolds and hoses to reduce coolant spillage COOLANT BY PASS HOSE SERVICE MANUAL 1975 SCORPION BRUT FIG 1 7 FIG 1 8 HOSE I 1 7 ...

Page 8: ...Release the springs which fasten the exhaust wye to the muffler 7 lift the engine from the sled and drain the coolant ENGINE DISASSEMBLYI ASSEMBLY Disassembly Peripheral Equipment 1 Remove the carburetor to engine Elbow connectors 2 socket head screws elbow See Fig 1 2 2 Disconnect the exhaust wye Socket head screws 3 Disconnect the coolant by pass hose 2 clamps See Fig 1 7 l 8 FIG 1 10 ...

Page 9: ...tlet manifolds 6 mm nuts 5 Disconnect the water pump mounting brackets 3 8 mm bolts 6 Remove the front motor mounts from the engine SERVICE MANUAL 1975 SCORPION BRUT COO ANT COOLANT INLET MANIFOLD OUTLET MANIFOLD FIG 1 12 FIG 1 13 1 9 ...

Page 10: ...RUT Engine Disassembly 1 Remove heads Remove 8 mm nuts 6 per head Pry up carefully to separate heads from cylinder 2 Remove cylinders 0 Remove 10 mm cylinder nuts Slide cylinders off pistons FIG 1 14 HEAD NUTS FIG 1 15 CYLINDER NUTS ...

Page 11: ...s SNAP RIN Slide piston pin out of piston Exercise care that excessive side pressure is NOT applied to the connecting rod Pull piston from connecting rod Remove pin bearing and bearing spacers SERVICE MANUAL 1975 SCORPION BRUT FIG 1 16 FIG 1 17 FIG 1 18 1 1 1 ...

Page 12: ...ND 1 Remove hex head bolts with locking strips 2 Remove seal 3 Remove gask et MAGNETO END 1 Remove Recoil Starte r Take hex head screws out Pull recoil off crankcase 2 Complete Disassembly 1 12 LOCKING STRIP 1 FIG 1 19 HEX SCREWS t FIG 1 20 ...

Page 13: ...lley SERVICE MANUAL 1975 SCORPION BRUT 440MODEL a Remove 6 mm pump pulley bolts emergency rope pulley and water pump pulley EMERGENCY ROPE PULLEY k WATER PUMP PU b Remove 18 mm nut holding rotor on shaft FIG 1 22 FIG 1 21 b Remove 18 mm nut holding rotor on shaft FIG 1 23 l 1 3 ...

Page 14: ...from shaft using puller d Take out pulleys head screws holding magneto to crankcase Remove magneto FIG 1 25 1 14 ROTOR 440MODEL c Pull rotor from shaft using puller FIG 1 24 d Take out Phillips head screws holding magneto to crankcase Remove magneto FIG 1 26 j ...

Page 15: ...MODEL e Remove Phillips head screws holding seal to crankcase Remove seal FIG 1 27 SERVICE MANUAL 1975 SCORPION BRUT 440MODEL e Remove Phillips head screws holding seal to crankcase Remove seal FIG 1 28 1 15 ...

Page 16: ... 1 Remove 8 mm bolts 18 440 12 340 and 2 1 0 mm bolts 2 To loosen crankcase hold bottom half firmly and tap top half with plastic mallet 3 Lift top half of crankcase off 4 Lift crankshaft out of lower half of crankcase 1 16 FIG 1 29 FIG 1 30 FIG 1 31 FIG 1 32 ...

Page 17: ...t in crankcase with positioning ring in groove 3 Install rotor key in crankshaft carefully 440 Model only Grease labyrinth seal and oil bearings Apply gasket sealer on lower half of crankcase Place upper half of crankcase on lower half SERVICE MANUAL 1975 SCORPION BRUT LABYRINTH SEAL FIG 1 34 FIG 1 33 FIG 1 35 1 17 ...

Page 18: ...SERVICE MANUAL 1975 SCORPION BRUT 4 Install crankcase bolts and torque See Specifications P 1 4 5 Install cylinder bose gaskets l 18 FIG 1 36 FIG 1 37 I ...

Page 19: ... Select and install correct end gasket depending upon depth measurement as follows Depth Measurement 091 and over 081 to 091 080 and less Gasket Thickness 2 mm 003 3 mm 0 12 5 mm 020 3 Bolt seal plate in position 4 Bend lock tabs to secure plate bolts FIG 1 40 SERVICE MANUAL 1975 SCORPION BRUT SEAL MOUNTING SURFACE FIG 1 38 FIG 1 39 FIG 1 41 1 19 ...

Page 20: ...before placing pistons on rods 3 Slip pistons over connecting rods holding bear ings and spacers in position 4 Insert piston pin through piston bearing and spacers elnstall remaining snap ring See Fig 1 16 and 1 17 PISTON RING INSTALLATION Expand ring until it just slips over piston Do not expand any further than necessary Position rings so that ring notch slides over ring locating pin See Fig 1 4...

Page 21: ...buretor side is toward side of crankcase with im pulse fittings 2 Place wooden block or other sup port crankcase to support piston 3 With ring compressor over rings slide cylinder onto piston SERVICE MANUAL 1975 SCORPION BRUT PISTON SUPPORT RING COMPRESSOR r FIG 1 43 l 21 ...

Page 22: ...N Tighten torque 10 mm nuts on cylinder studs securely to 25 Ft lbs 5 Place heads on cylinders 1 22 Locate outlet coolant manifold on heads eTorque 6 mm manifold nuts to 5 Ft lbs Torque 8 mm head nuts on studs torque to 20 Ft lbs See Specifications for torquing sequence I It r FIG 1 44 CYLINDERS INLET MANIFOLD HEAD NUTS J v FIG 1 45 OUTLET MANIFOLD ...

Page 23: ...ial cam without magnetic f lywheel installed so that gap check can be seen Under normal cond itions t he gap w il l be checked through the windows in the f lywheel rotor See Fig 1 49 SERVICE MANUAL 1975 SCORPION BRUT ARMATURE MOUNTING SCREW POINTS CAM CAM LLER AT HIGH POINT ON CAM POINTS MOUNTING SCREW FIG 1 47 015 POINT GAP l 23 ...

Page 24: ...ANUAL 1975 SCORPION BRUT 2 Install special bolt in flywheel to hold the weight arms in the full advance position 1 24 WEIGH ARMS FLYWHEEL FIG 1 48 SPECIAL BOLT FOR POSITIONING WEIGHT ARM FIG 1 49 FLYWHEEL WINDOW ...

Page 25: ...clarity Under nor mal circumstances the dial in dicator will be inserted through the spark ptug hole Connect an ohmmeter with one terminal to the red lead from the magneto the other termi nal grounded to the crankcase SERVICE MANUAL 1975 SCORPION BRUT DIAL INDICATOR OHMMETER I OHMMETER GROUND 0 HOT LEAD CONNECTED HERE 1 25 ...

Page 26: ...en decrease in resistance This means that the points have closed 1 26 The dial indicator should read 150 to 160 See Note If the dial indicator reads outside this tolerance adjust to within tolerance by loosening the moun ting screws and rotating the magneto armature plate in the applicable direction NOTE Timing is set at 150 160 full advance 340 Brut when new points are used to allow for break in ...

Page 27: ...he white lead from the magneto 8 Adjust the point closing position to within 005 of the position established for the 1 cylinder This is done by loosening the points mounting screw and ad justing the point gap in the necessary direction See Fig 1 47 SERVICE MANUAL 1975 SCORPION BRUT FIG 1 53 1 27 ...

Page 28: ......

Page 29: ... 1975 SCORPION BRUT Service Manual Carburetor Section 2 l ...

Page 30: ...l for all engine demands In order for the carburetor to provide the correct air fuel ratio under all eng ine loads four separate fluid circuits are provided 1 Starter System 2 Pilot System 3 Main System 4 Float System The schematics included in the section are functionally correct but do not necessarily represent the actua l physical appearance of the carburetor A significant departure from the ph...

Page 31: ...ng Valve and there is mixed with air from the intake port 4 The final mixture is delivered to the engine intake through the fuel discharge port 5 The starter system is activated by the Fuel Enriching Valve Control on the instrument panel NOTE It is important that the throttle valve is closed during the Starting Operation SERVICE MANUAL 1975 SCORPION BRUT r l I Jt r t J I INTAKE PORT EMULSION TUBE ...

Page 32: ...m 2 Fuel is metered through the pilot jet 3 The fuel is mixed with air adjusted to the proper amount by the air screw 4 The mixture is mixed with additional air coming in through the by pass 5 Finally the mixture is drawn through the pilot outlet to mix with air flowing through the main bore FIG 2 4 AIR JET AIR SCREW 2 4 NEEDLE JET AIR FLOW I I BY PASS AIR SCREW 1 I 11 I I I I I I L _ I I I I _ _ ...

Page 33: ... passes through main jet b Fuel is metered in the clearance between the needle jet and the jet needle c Fuel is mixed with air in the needle jet d The mixture is injected into the main bore and mixed with the main air flow as it is transported to the engine 3 Throttle valve to full open a Fuel is metered by the main jet SERVICE MANUAL 1975 SCORPION BRUT AIRFLOW JET NEEDLE NEEDLE JET THROTTLE VALVE...

Page 34: ...to the float chamber 3 When the buoyancy of the floats overcomes the fuel pressure the needle valve closes shutting off the fuel supply 4 If the fuel level becomes too high excessive fuel leaves the nozzle enrich ing the mix ture 5 Too low fuel level results in a lean mixture FUEL OUTLETS FIG 2 10 PUMP DIAPHRAGM 2 6 NEEDLE VALVE FLOAT FLOAT ARM NEEDLE JET RETAINER NEEDLE VALVE FIG 2 7 FIG 2 8 FIG ...

Page 35: ... sequence removed MISCELLANEOUS 1 To drain the float bowl remove the main jet holder in the bottom of the bowl 14 mm wrench 2 Remove the jet from the jet holder 6 mm wrench 3 Remove Enriching Valve Starter Assembly 12 mm wrench ENRICHING VALVE CYLINDER ENRICHING VALVE CAP RETAINER SPRING FIG 2 13 SERVICE MANUAL 1975 SCORPION BRUT MAIN JET FIG 2 12 MAIN JET HOLDER ENRICHING VALVE CAP FIG 2 11 2 7 ...

Page 36: ... 7 Remove idle speed screw flat blade screwdriver See Fig 2 15 THROTTLE VALVE Fig 2 16 1 Remove the cap lock Phillips screwdriver 2 Unscrew the carburetor cap hand operation 3 Remove the following parts a Spring b Valve c Keeper Washer d Jet Needle THROTTLE VALVE 2 8 AIRSCREW FIG 2 14 IDLE SPEED SCREW FIG 2 15 CARBURETOR CAP CAP SPRING LOCK t r JET NEEDLE KEEPER WASHER FIG 2 16 J ...

Page 37: ...ead screws Phillip screwdriver 2 Remove float bowl MOUNTING SERVICE MANUAL 1975 SCORPION BRUT SCREWS FIG 2 18 FIG 2 17 NEEDLE JET RETAINER FITTING I NEEDLE JET FIG 2 19 1 Unscrew retainer fitting 8 mm wrench 2 Remove needle jet o FIG 2 19 NEEDLE JET 2 9 ...

Page 38: ...cleaning Any nicks scratches or other damage may cause the carburetor to malfunction REASSEMBLY Reassemble in the reverse order of disassem bly CARBURETOR ADJUSTMENTS FLOAT ADJUSTMENT See FIG 2 20 1 The float arm position determines the fuel level in the float bowl 2 The float arm is adjusted by bending the lip 3 The dimension from the flat surface of the carburetor body to the bottom of the float...

Page 39: ... dull the pilot jet is too big d If the increase of engine speed is slow and irregular or if speed can not be maintained in the 12 25 MPH range with throttle constant the pilot jet is too small 3 Air Screw Position a Warm up the engine b Set the idle speed screw about 15 higher than the desired idle speed c Turn the air screw in and out to deter mine the point at which the engine RPM is maximum d ...

Page 40: ...roper air fuel rati_ o and thereby engine performance at partial loads 1 4 to throttle valve opening The jet needle tapers and the clearance between the needle and needle jet increases as the throttle valve opening increases The air fuel ratio is controlled by the position of the E ring that is inserted in one of the five 5 slots on the head of the needle See Fig 2 21 2 The main jets provided with...

Page 41: ...d 3 Clean as necessary FUEL LEAN CONDITION Engine overheats 1 Ice or water in float bowl 1 Drain and clean float bowl Acceleration is poor main jet and needle jet 2 Dirt in jets or fuel passage 2 Disassemble carburetor and Spark plugs burn clean Engine RPM fluctu 3 Carburetor connections leak 3 Repair as necessary ates power is low air Condition improves 4 Needle jet blocked or 4 Replace as necess...

Page 42: ......

Page 43: ... l 1975 SCORPION BRUT Service Manual Electrical Section 3 1 ...

Page 44: ...and controls operation is generated by rotating a per manently magnetized flywheel mounted on the engine crankshaft past a stator which contains lighting coils The no load voltage generated increases with engine R P M To safeguard the system a regulator limits the voltage level to 13 14 volts maximum See Voltage Regulation Section Main Elements 1 Magnetic Rotor 2 lighting Coils BRUT 340 3 2 BRUT 4...

Page 45: ... LIGHTING COILS STATOR LIGHTING COILS STATOR TAN RED RED TAN SERVICE MANUAL 1975 SCORPION BRUT YELLOW YELLOW ENGINE CONNECTOR 340 BRUT FIG 3 4 YELLOW YELLOW ENGINE CONNECTORS 440 BRUT FIG 3 5 3 3 ...

Page 46: ...flow through the primary wind ing its force field immediately collapses and generates a very high voltage in the second coil This voltage in the region of several thousand volts will jump the spark plug gap causing ignition to begin The collapsing lines of force cut through the primary windings raising the voltage in that circuit also As this occurs the condenser ab sorbs the generated current to ...

Page 47: ...SERVICE MANUAL 1975 SCORPION BRUT IGNITION COIL STATOR CONDENSER Ht SPARKPLUG EXTERNAL IGNITION COILS SPARK PLUG FIG 3 8 ENGINE CONNECTOR 340 BRUT IGNITION SCHEMATIC 3 5 ...

Page 48: ...ll exceed the voltage necessary to jump the spark plug gap even when the plugs are fouled All three plugs fires simultaneously every 120 degrees Timing of cylinder pressure however determines which one of the three cylinders supports combustion The keyed relationship between the crankshaft and the rotor determines the timing of the engine The timing is electronically advanced progressively from st...

Page 49: ...S CONDENSER CDI UNIT CONNECTOR SERVICE MANUAL 1975 SCORPION BRUT ENGINE CONNECTOR CD IGNITION t NGINE CONNECTORS LIGHTING COIL FIG 3 10 EXTERNAL COILS CONNECTOR 1 SAFETY SWITCH CONNECTOR ENGINE CONNECTOR FIG 3 11 EXTERNAL COILS 11 SPARK PLUG LEADS FIG 3 12 3 7 ...

Page 50: ...across the lighting coils in parallel with the electrical load of the sled Under operating conditions the voltage drop across the regulator is such that 13 8 volts RMS is supplied to the snowmobile lighting circuit 3 8 SCR MOUNTING BRACKET TRANSISTOR VOLTAGE REGULATOR SCHEMATIC FIG 3 14 FIG 3 13 SENSING ELEMENT ...

Page 51: ...ned out sensing element Normal resistance across the regulator is approximately 155 160 The symptom of a burned out sensing element is a significantly increased resistance reading b Shorted SCR Shorted SCR is characterized by a significantly reduced resistance reading 2 Set point check Use test circuit as shown below Read voltage across regulator Value should be 13 8 5V 120V 100W 5 n REGULATOR SET...

Page 52: ...items is supplied through the ignition switch in the lights mode Grounding of the wiring system is ac complished at the roll bar Main elements of the system are 1 Main wiring harness 2 Seat wiring harness 3 Safety switch 4 Brake light switch 5 High Low switch 6 Ignition switch SPEEDOMETER CONN TACHOMETER CONN HEAD LIGHT CONN REG CONN ENGINE CONN In WAR ING t SAFETY SWITCH LIGHT CONN I I CONN TAILL...

Page 53: ...1975 SCORPION BRUT 340 r I R W r w Y W I 7 I IGNITION SWITCH CONN Y W 111 1 r TACHOMETER CONN Y W B I 7 1 SPEEDOMETER CONN z 3 0 Ill 111 1 fl BROWN r 7 BRAKE SW CONN YELLOW WHITE BLACK 3 0 w I I Y W B RED WHITE YELLOW I BROWN l GREEN WHITE BLUE L HEADLAMP CONN TEMP LIGHT CONN TAIL BRAKE LIGHT CONN HI LO SWITCH CONN C m a n m 3 z c r o Cll C n 0 a tt 0 z a c 4 ...

Page 54: ...tch Red White Hot Brake Light Switch Taillight Connector Yellow Connector White Hot Engine Connector Safety Switch Connector Hot Safety Switch Connector Ignition Switch Connector Yellow Hot Brake Light Switch Connector Heat Warning Indicator Yellow White Hot Engine Connector Ignition Switch Connector Hot Engine Connector Regulator Connector Hot Regulator Connector Brake Light Switch Connector Hot ...

Page 55: ...RAKE SW CONN L I IGNITION SWITCH CONN YELLOW WHITE BLACK 3 0 yffl B I I LI I RED WHITE YELLOW BROWN II I J TEMP LIGHT CONN TAIL BRAKE LIGHT CONN WIRING SCHEMATIC FIG 3 18 ELECTRICAL DISTRIBUTION CONTROL 1975 SCORPION BRUT 440 yffl B I I SPEEDOMETER CONN z 3 0 1111 CCI r II BROWN GREEN BLUE HI LO SWITCH CONN HEADLAMP CONN m a n m 3 z c r o II n 0 a 0 z CCI a c t ...

Page 56: ... Taillight Connector Ground Roll Bar Green Hot Lo Hi Lo Switch Connector Headlamp Connector Lo Lo Red White Hot Brake Light Switch Taillight Connector Yellow Connector Brake Light Yellow Hot Brake Switch Connector Temperature Light Connector Yellow White Hot Engine Connector Ignition Switch Connector Hot Ignition Switch Connector Instrument Connector hot Engine Connector Regulator Connector Hot Re...

Page 57: ...nd failed regulator sensing element bulbs Incorrect Set Point too high Burned out Failed bulb Replace bulb lights individual Burned out lights Intermittent short in wire harness Repair or replace wire harness Engine won t run 1 Open or shorted windings in 1 Replace armature plate Weak or no ignition coils stator spark 2 Open or shorted windings 2 Replace external coil in external ignition coil 3 S...

Page 58: ...1 ...

Page 59: ... 1975 Scorpion Brut Service Manual Clutch Drive Section 4 1 ...

Page 60: ...ble drive clutch at the minimum pitch under zero and idle speed conditions Under acceleration the torque from the engine is greater than the demand from the track As RPM increases the weight arms move to force the movable in away from the cover At the some time the belt tension and belt friction on the movable sheave results in a relative rotational motion between the cover and the movable such th...

Page 61: ... 2 Remove large nut holding clutch to gether 3 Insert a II x 3 V4 II steel plug in hollow drive clutch hub Use large nut with plug as puller to remove clutch SERVICE MANUAL 1975 SCORPION BRUT 7 16 CLUTCH BOLT CLUTCH ASSEMBLY NUT STEEL PLUG ASSEMBLY NUT 4 3 ...

Page 62: ...ble firmly with cover fac ing the floor rap the large nut sharply against the floor or some other firm object The cover will separate from the stationary hub 3 Remove the large nut Remove the movable and cover from the stationary 4 Completely disassemble clutch Re verse of assembly procedure which see 4 4 COVER J l t ASSEMBLY NUT MOVABLE SHEAVE 1 I Q r J OWJJ STATIONARY SHEAVE FIG 4 4 r ...

Page 63: ...h through that the keeper retainer can be installed The spring tang must be in one of the grooves in the movable bore 2 Position the spring retainer 3 Push the spring back up against the retainer Install the plastic bushing SERVICE MANUAL 1975 SCORPION BRUT SPRING TANG GROOVE FIG 4 5 FIG 4 7 4 5 ...

Page 64: ...ert the bushing with washer in weight arm NOTE The nylon washer always goes on the clockwise side of the weight arm when viewed looking into the clutch cover 2 Install weight arm in cover secur ing it with bolt 4 6 SHOE PAN HEAD SCREW FIG 4 8 BUSHING NYLON W SHER I 1 0 FIG 4 9 FIG 4 10 ...

Page 65: ...tationary hub 2 Prepare the cover with a rubber band holding the weight arms correctly Insure that the shoes on the weight arms are all properly oriented Place cover over movable SERVICE MANUAL 1975 SCORPION BRUT I FIG 4 12 HOLE INNER TANG CORRECT SHOE ORIENTATION INCORRECT ORIENTATION FIG 4 13 RUBBER BAND FIG 4 14 4 7 ...

Page 66: ...SERVICE MANUAL 1975 SCORPION BRUT Make sure that the index marks on rim of the movable and cover are aligned 3 Secure clutch together with large nut Remove rubber band 4 8 FIG 4 15 INDEX MARKS FIG 4 16 ...

Page 67: ...ary splined hub until locking inserts clear the cam top hub 2 Remove locking inserts 3 Allow cam top to move off the splined stationary hub slowly Be careful since the spring is un der both compression and wind up that the cam does not fly off or rotate rapidly from spring wind up 4 All parts of driven clutch can then be separated SERVICE MANUAL 1975 SCORPION BRUT SCREW SECURING CLUTCH TO JACK SHA...

Page 68: ...UT DRIVEN CLUTCH ASSEMBLY 1 Place washer on stationary hub Install movable sheave on stationary sheave 2 Place clutch spring over hub of movable 3 Insert the spring tang in the 2 hole 340 or 1 Hole 440 4 10 FIG 4 18 FIG 4 19 FIG 4 20 ...

Page 69: ...130 degrees This will wind up the spring The movable must be restrained during this step 7 Push the cam top down over the splines to clear the locking insert groove 8 Install inserts Release the clutch The cam top will snap back until the cam ramps are engaged SERVICE MANUAL 1975 SCORPION BRUT FIG 4 21 CAM LOBE SPLINES FIG 4 22 4 111 ...

Page 70: ...re and shaft In sure that there is no lubrication on the shaft or in the clutch bore 2 Insert the clutch attach bolt See Fig 4 1 Torque to 75Ft lbs DRIVEN CLUTCH 1 With the Jack Shaft in position slide the driven clutch assembly on the end of the shaft 2 Secure the clutch assembly on the shaft with attaching screw and lock washer See Fig 4 17 1 12 _ ...

Page 71: ...ary sheaves They should be parallel and off set by V2 See Fig 4 23 2 If the sheaves are not parallel loosen the mounting bolts on the chain case and rotate the chain case to bring the sheaves into parallelism SERVICE MANUAL 1975 SCORPION BRUT ALIGNMENT BAR ADJUSTMENT SLOTS CHAIN CASE MOUNTING BOLTS FIG 4 24 4 13 ...

Page 72: ...er washers on end of shaft to provide the correct off set DRIVE CLUTCH ADJUSTMENT The cut in speed of the BRUT clutch is 3800 4200 rpm The control speed is 7000 to 7200 rpm To vary the shift range of the machine add or subtract washers on the pan head screws on the weight arms See Fig 4 9 4 14 JACK SHAFT SPACING WASHER FIG 4 25 _ ...

Page 73: ...jack shaft splines DISASSEMBLY 1 Remove cotter pin and castillated nut Brake assembly can then be separated into component parts ASSEMBLY 1 Insert steel plate and wear pad into recessed area in back of castings SERVICE MANUAL 1975 SCORPION BRUT CABLE BRACKET CLEVIS FIG 4 26 ATTACHING BOLTS STEEL PLATE J FIG 4 27 4 15 ...

Page 74: ...g holes round ed end out 3 Position lever over threaded stud and washer on top of lever 4 Install castillated nut and cotter pin INSTALLATION 1 Reverse of removal See Fig 4 26 WASHER FIG 4 30 4 16 PINS DEND A LEVER NUT COTTER PIN FIG 4 28 FIG 4 29 FIG 4 31 _ ...

Page 75: ... 0 1975 Scorpion Brut Service Manual Suspension Section 5 l ...

Page 76: ...ejected from his operating position and controls 3 Prevent damage to the machine 4 Increase ground contact and improve trac tion The track suspension on the 1975 Scorpion Brut is a slide unit type suspen sion especially designed with the following characteristics 1 Rugged construction for all out performance 2 Fully adjustable to suit the operator s needs under all conditions 3 Dampening provided ...

Page 77: ...L 1 Place the sled on th e floor with a 2 x 4 underneath the track Place weight on the sled to ex tend the cross shaft 2 Remove the r ea r mounting screws Relea se w e ight 3 Remove locking bolts locks and front mounting bolts 4 Plug bl eed hole in gas cap Turn t machine on its side Pull suspe n sion out SERVICE MANUAL 1975 SCORPION BRUT FIG 5 2 FRONT MOUNTING BOLTS WITH LOCKING DEVICE 5 3 ...

Page 78: ...emove chain drive components a Remove snap ring on upper sprocket b Remove bolt on lower sprocket c Back out chain tension tighten ing bolt d Slide sprockets and chain out together CHAIN TENSION TIGHTENING BOLT LOWER SPROCKET BOLT CHAINCASE MOUNTING BOLTS 4 5 4 I _ FIG 5 3A FIG 5 38 ...

Page 79: ...collar over shaft 4 Loosen chaincase mounting bolts 5 Push shaft into chaincase hole 6 Lower opposite end of shaft and pull out of tunnel SUSPENSION DISASSEMBLY 1 Remove 5 16 bolts securing sprockets to shaft See Fig 5 4 2 Slide sprockets off shaft SERVICE MANUAL 1975 SCORPION BRUT FIG 5 4 LOCKING COLLAR SPROCKET MOUNTING BOLT 5 5 ...

Page 80: ...cross bolt Pull shock assembly out of slide assembly See Fig 5 6 3 Additional disassembly of the slide suspension may be ac complished by removing shafts which hold the a front idlers b rear idlers c front mounting weldment torque arm weldment FRONT IDLERS r t TORQUE ARM __ 111 WELDMENT EYEBOLT SUSPENSION SPRINGS REAR IDLERS 5 6 J FIG 5 5 u ...

Page 81: ... _ SERVICE MANUAL 1975 SCORPION BRUT FIG 5 6 ASSEMBLY INSTALLATION Assembly and installation is accomplished in reverse order of removal and disassembly FIG 5 7 FIG 5 8 5 7 ...

Page 82: ...0 ...

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