Chevrolet 1948 heavy duty Operator'S Manual Download Page 46

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Summary of Contents for 1948 heavy duty

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Page 2: ... I I LIGHT and HEAVY 11 I DUTY TRUCKS 1 I t ...

Page 3: ...he booklet Chevrolet Motor Division General Motors Corporation Detroit 2 Mi l an SUBJECT INDEX Driver s Operatin Information Page Breaking in Period 3 Controls and Instruments 4 Prestarting Inspection _ 13 Starting thelngine 14 GearsMbng 14 Cold Weather OperatIOn 17 Hot Weather Operation 18 Tire Inflation 19 Tools 20 Description Care and Maintenance Preventive Maintenance Engine Cooling System Clu...

Page 4: ...1ig J Controls and nstrumenfs 12 and I Ton ...

Page 5: ...operly break in the moving parts and assure long care free service do not drive faster than 35 miles per hour for the first 100 miles 45 miles per hour for the next 200 miles 50 miles per hour for the next 200 miles Continuous high speed driving should be avoided until the truck has been driven 2 000 miles The engine should not be raced or run at high speed in lower gears especially until it is th...

Page 6: ... instrument group fig 3 It is in effect a ther mometer with the operating bulb located in the water jacket at the left rear corner of the cylinder head Normally this thermometer will register between 140 and 180 degrees when the engine is thoroughly warmed up The driver should watch this instrument closely as a quick rise in tem perature usually indicates trouble Should the temperature rise above ...

Page 7: ...increased the hand should move over near the 15 mark In cold weather especially with heavy oil the hand may move over to the 30 mark at comparatively low engine speeds This indicates that the oil is too heavY to properly lubricate the engine NOTE Do not accelerate the engine excessively until the oil is suffi ciently warm to permit a lower pres sur If the gauge does not show any pressure stop the ...

Page 8: ...osition the headlamps and tail lamp are lighted Current for the lighting circuits passes through a thermal circuit breaker located on the light ing switch behind the instrument panel In case all lights fail to operate check for trouble at the thermal circuit breaker The instrument lights can be dimmed or turned off by turning the light switch button clockwise Dimmer Switch The dimmer switch locate...

Page 9: ...e purpose of this control is to close or partly close the carbu retor choke valve restricting the air intake and producing a richer fuel mixture for starting When the engine is warm and the weather is warm it should not be necessary to use the choke when starting the engine When it is necessary to use the choke for starting it should be pushed part way in as soon as the engine starts and all the w...

Page 10: ...the correct amount to obtain the desired engine or vehicle speed Clutch Pedal Is conveniently located for use by the driv er s left foot fig 10 It is used to engage and disengage the clutch thereby connect ing the engine to or disconnecting it from the transmission and drive line to rear wheels The clutch pedal should have to 1 inch free travel if less than adjust free travel see Clutch Adjustment...

Page 11: ...ge the clutch move Fig II Four Sp d the lever across neutral to right or T an mission Shlflin9 Diagram left as desired and then forward or back into gear To shift into reverse disengage the clutch move the lever to the left against the spring tension as far as it will go and pull it back into reverse position Gearshift Lever 3 speed Synchro mesh Transmission Gear shift control on all h and ton tru...

Page 12: ...ash tray is located in the instrument panel to the left of the package compartment fig 14 The tray is opened or closed by pulling back or pushing forward on the handle Instrument Panel Compartment Lock The door to the convenient package compartment at the right end of instrument panel is controlled by a lock above the com partment fig 15 When the lock is unlocked depressing the lock cyIin der rele...

Page 13: ...back Fig 17 Door Lock and Key to vertical position to remove key fig 17 To lock the door insert key in lock and turn key counterclockwise as far as it will go and back to ver tical position to remove key To lock either door from the inside it is only neces sary to move the inside re mote control handle up fig 18 Pushing down on the inside handle unlocks the door even when it has been locked with a...

Page 14: ...through the left door window Seat Adjuster The entire seat as sembly can be moved forward or back to obtain the most comfortable position for the driver As the seat is moved forward it raises and tips for ward and as it is moved hack it is lowered to accomodate a tall person Moving the adjuster handle forward fig 20 releases the seat adjuster lock so that the seat assembly can be moved for ward or...

Page 15: ...G INSPECfION The following inspections are not necessary each time the vehicle is started provid ing the driver has recently driven the vehicle and is cer tain that attention is not re quired 1 Raise the hood remove the oil gauge rod from right side of crankcase just back of distributor fig 23 wipe oil from rod with clean cloth and replace Remove gauge rod and note level of oil If down to the add ...

Page 16: ...n as engine starts If engine does not start in 15 seconds release pedal and check to see that the above operations have been completed 6 As soon as engine starts push choke button in part way and adjust throttle for smooth idle 7 Note oil gauge and ammeter readings Ammeter should show some charge unless engine is idling slowly Oil gauge should show some pressure In unusually cold weather the oil g...

Page 17: ... accelerator pedal and at the same time slowly engage the clutch Control the vehicle speed with the accelerator Shifting to Reverse 3 speed transmission The vehicle should not be moving forward when shifting to reverse 1 Depress clutch pedal to disengage the clutch 2 Raise shift lever up across neutral and forward into re verse position fig 12 3 If parking brake is on release the brake 4 Push down...

Page 18: ...dometer reading regard less of the axle ratio used To shift from low speed to high fig 24_Two_Sp d Axle Shift speed move control lever to high Control speed position as indicated on uDECAL above speedometer release accelerator pause a second to allow engine speed to drop down then again step down on the accelerator To shift from high speed to low speed move control lever to low speed position rele...

Page 19: ...d to provide the additional power necessary to crank a cold engine and furnish a good spark A discharged battery will freeze in extremely cold weather which will make battery replacement necessary 4 The carburetor fuel pump and fuel tank should be kept free from water which will freeze and restrict fuel flow 5 The ignition system should be kept in good condition 6 Assuming that the above items hav...

Page 20: ...pay dividends in the form of economy and convenience 1 Check the radiator regularly for sufficient coolant as the rate of evaporation is higher in hot weather 2 Make sure the fan belt is in good condition and properly adjusted 3 Keep the radiator area free of bugs and other things that restrict air circulation 4 Have the water level in the battery checked at lO day intervals 5 Starting a cool engi...

Page 21: ...s rear 32 pounds 6 00 18 6 Ply front 30 pounds rear 36 pounds 7 00 18 8 Ply froni 40 pounds rear 55 pounds 8 25 18 10CPly rear 60 pounds 9 00 18 lO Ply rear 65 pounds 6 50 20 6 Ply front 40 pounds rear 50 pounds 7 00 20 8 Ply front 40 pounds rear 55 pounds 7 50 20 8 Ply front 40 pounds rear 60 pounds 8 25 20 10 Ply front 40 pounds rear 65 pounds 6 50 20 8 Ply front 50 pounds rear 65 pounds 7 00 20...

Page 22: ...oad ad justments Figure 25 shows the tools furnished with the 1V2 ton 2 ton and 2 ton C O E models Other models have similar tool kits how ever the jack tire iron and wheel nut wrench will vary depending on models A very large tool com partment is provided under the seat of all Chevrolet built bodies fig 26 Fig 26 Cab 1001 Compartment 20 ...

Page 23: ... 0 1000 0 2000 0 0 0 3000 0 0 0 4000 0 0 0 0 5000 0 0 0 6000 0 0 0 0 0 7000 0 8000 0 0 0 9000 0 0 0 10000 0 0 0 0 0 0 0 11000 0 12000 0 0 0 0 0 13000 0 14000 0 0 0 15000 0 0 0 0 0 0 For complete instructions see Charts on paees 76 to 81 tFor complete r ommendatlon on changing oil and proper rade oC oil to use see pages 63 to 67 tAlso crankcase ventilatc r and hydrovac air cleaners when used The fo...

Page 24: ...d cause undue wear and poor oil economy The water passages between the cylinder block and cylin der head properly direct the flow of water to provide uniform cooling of the engine fig 27 Additional cooling of the area around the exhaust valve seats is provided by the use of nozzles to direct the flow of water to these points Care The engine oil level should be checked each time fuel is purchased a...

Page 25: ...earance and counterclock wise to increase clearance fig 2S Tighten lock nut and recheck clearance 5 Adjust remaining valve clearances in the same man ner Exhaust Valves 013 to 015 020 6 Install the rocker arm Fig 28 Valve Tappet Adjustment cover using a new gasket Make sure cover seats properly on gasket and tighten retain ing nuts Check for oil leaks Carburetor Description Conventional Models The...

Page 26: ...e made together as changing the adjustment on one affects the other Run engine a few min utes to warm it up Push choke button in all the way Tum idling mixture adjust ing screw A fig 29 in clockwise as far as it will go and then back it off 1 turns Let engine idle at 450 to 500 revolutions per min ute and turn idling mixture adjusting screw A in or out as necessary to obtain a smooth idle NOTE If ...

Page 27: ...mp ened filter element in the air cleaner This filter element com bined with a woven pad in the top of cleaner acts as a flame arrestor in case of engine backfire Description Heavy Duty Cleaner In certain sections of the country or under certain operating conditions where an un usual amount of dirt is encountered a heavy duty air cleaner of the oil bath type is available This cleaner is interchang...

Page 28: ...nd lighter oil in winter adding oil and servicing the cleaner will vary greatly depend ing upon operating conditions Experience will tell when these services should be performed Servicing of this cleaner an important operation must be performed as follows Loosen clamp screw and remove air cleaner assem bly Remove wing nut which retains the cover and remove cover and filter element as sembly fig 32...

Page 29: ...d at the lower right hand side of the cylin der block fig 33 All and C O E models are oil filled through a com bined oil filler and ventilator tube assembly Fuel Pump Description The fuel pump is mounted on the right side of engine fig 34 and is operated by an eccentric on Fig 33 FiII Cap and Venfllotor the engine camshaft It pumps fuel from the main fuel tank and delivers it to the carburetor Fig...

Page 30: ... and remove the pipe connector nuts Remove the fuel pump to engine cap screws and remove fuel pump Remove pipe fittings from pump Obtain new pump and pump tb engine gasket Install pipe fittings in new pump and install pump on engine using new gasket Connect gasoline lines start engine and check for pump operation and possible leaks Governor Description Governors are standard equipment on the schoo...

Page 31: ...rting the engine or operating at idling speed The generator furnishes the ignition current at higher speeds The distributor mounting provides a means of properly setting the initial ignition timing The spark advance for various speeds and loads Fig 37 19niliolt Cirelli is controlled automatically by governor weights and vacuum control in the distributor The vacuum control is connected to the carbu...

Page 32: ...e file they should be replaced Point Adjustment Crank the engine or place transmission in high gear and rock the truck forward enough to place the movable point cam follower on the peak of cam and check the point opening using a feeler gauge Correct adjustment is 018 If nec essary to adjust the points loosen the stationary point lock screw and turn the eccentric screw as necessary fig 38 Tighten l...

Page 33: ...and retard it to prevent excessive detonation with lower octane rated fuels Note the position of the octane selector scale fig 39 loosen the clamp bolt and move the distributor assembly toward advance or retard as desired and tighten the clamp bolt securely By adjusting the spark in this manner it can be readjusted to the original set ting when desired without special ignition timing equipment Spa...

Page 34: ...As the engine warms up the thermostatic spring moves the valve to the heat off position as shown in the right half of Figure 41 and directs the exhaust gases away from the center of the intake manifold This thermostatic control results in maintaining the proper temperature of the incoming gases under all operating condi tions The tension of the thermostatic spring is very important When it is too ...

Page 35: ...sion cannot be successfully tuned Spark Plugs Remove clean and adjust page 31 Battery Check state of charge by testing specific gravity page 53 Battery Cables Clean and tighten cable terminals Distributor Clean and adjust distributor points Inspect cap and rotor page 30 Ignition Timing Check and adjust ignition timing page 31 Fuel Pump Clean fuel pump filter bowl and screen page 28 Air Cleaner Cle...

Page 36: ... operating tempera ture Care The cooling system must be kept in good condition if it is to properly cool the engine under all operating conditions The radiator cap should be removed and the coolant level checked frequently If the coolant level is low water or anti freeze should be added NOTE The volume of solution in a Chevrolet cooling system expands about one quart when its temperature is change...

Page 37: ...stat may cause abnormally high or abnormally low engine temperature If the condition of the thermostat is questioned it can be removed and tested as follows 1 Open radiator drain cock and drain out about half the coolant which will bring the coolant level below the thermo stat close drain cock 2 Loosen upper hose clamps and remove hose 3 Remove the two cap screws that attach the water outlet to th...

Page 38: ...e necessary to replace the water pump it may be done as follows 1 Drain the cooling system and remove the fan belt as instructed above 2 Remove the cap screws attaching the fan blades to pump and remove the fan 3 Loosen clamp and disconnect hose from pump Discon nect heater hose if one is attached to water pump 4 Remove the cap screws that attach pump to cylinder block and remove pump 5 Place new ...

Page 39: ...subsequent freezing The vehicle finish is softened and damaged by contact with alcohol solutions or vapors Alcohol accidentally spilled on the finish should be flushed off immediately with a large quantity of cold water without wiping or rubbing The use of an overflow tank connected to the overflow pipe of the radiator serves to condense and trap vapor or liquid that would otherwise be lost On coo...

Page 40: ...s are not injurious to the vehicle finish GM Ethylene Glycol is especially treated and compounded for use in the cooling system Other ethylene glycol prepara tions are available but only those containing suitable corrosion inhibitors and compounded for use in automotive cooling sys tems should be used GM ETHYLENE GLYCOL PROTECTION TABLE Cooling System C888eity in uarts QUirts of GM Ethylene Glycol...

Page 41: ...l and glycerine have a tendency to shrink rubber that previously has been swollen by the absorption of water and leaks may develop The water pump seal must be leak tight not only to avoid loss of liquid but to prevent air from being drawn into the cooling system Aeration of the cooling liquid causes foaming and promotes oxidation which may result in serious corrosion After the anti freezing soluti...

Page 42: ...temperature of the solution when tested may cause an error as large as 30 F Some testing devices are made to test only one kind of anti freezing solution Others have several scales and may be used for the correspond ing kinds of anti freeze The freezing point of a solution containing both al cohol and ethylene glycol cannot be determined accu rately by means of a hydr ometer CLUTCH Description The...

Page 43: ...be 3 4 to 1 fig 45 If adjust ment is necessary follow in structions below Maintenance Fig 4S Clufch Pedal Free Travel Clutch Pedal Adjustment Push the clutch pedal down with the fingers and note the amount of pedal free travel If this free travel is more than 1 or less than 3 4 adjustment should be made Loosen the lock nut A fig 46 on clutch release rod and back off the adjusting nut B to increase...

Page 44: ...he Lubrication Section Propeller Shaft and Universal Joints Description The If ton models use one universal joint directly back of the transmission and a torque tube enclosed tubular propeller shaft that is splined to the pinion shaft The universal joint is of the fully enclosed bushed type taking its lubrica tion from the transmission The ton models use two propeller shafts and three uni versal j...

Page 45: ... The shafts are locked in place by c locks which fit in grooves on the inner ends of the shafts and a thrust block between the ends of the two shafts Description a 1 Ph and 2 Ton These models all use a sturdy full floating rear axle having straddle mounted pinion bearings a four pinion differential and hypoid ring gear and pinion An adjustable thrust pad is placed back of the ring gear in line wit...

Page 46: ...he differential carrier and io spection plate bolts should be kept tight The axle flange to hub bolts on and 1 ton trucks should be kept properly tightened If these bolts are found loose and grease has worked out between hub and axle flange the safe way to avoid further trouble is to perform the following operations 1 Remove axle flange bolts bolt lock axle shaft and flange gasket 2 Clean the end ...

Page 47: ...heel hub mounted on the outer end of axle housing with two large barrel type roller bearings An adjust ing nut which screws onto the end of axle housing provides a means of adjusting the bear ings The h ton semi floating axle has the wheel bolted di rectly to the axle flange the bearing is in the outer end of the axle housing and rides on a special race on the axle shaft just back of the axle flan...

Page 48: ...lignment Since considerable expensive special equipment is required to properly check and adjust all the factors of front end align ment it is advisable to take the truck to your Chevrolet dealer for this service when the front end alignment requires attention Front Wheels and Bearings Description All Chevrolet trucks are equipped with demount able steel disc front wheels The h ton and ton use one...

Page 49: ...school bus and 2 ton models these have a reduction ratio of 27 76 The wormshaft is supported in the steering gear housing on barrel type roller bearings The ball nut is mounted on the worm with two sets of recirculating ball bearings The design of the steering gear makes it possible to adjust all backlash from the steering gear when the wheels are in a straight ahead position When the wheels are t...

Page 50: ... supply of fluid This automatically keeps the system full of fluid as long as there is a reserve supply in the reservoir Should the reservoir become empty or the hy draulic system be opened at any point air will enter the sys tem and affect the efficiency of the brakes When this occurs the hydraulic system must be bled Since this operation re quires the use of special equipment the vehicle should ...

Page 51: ... cylinder until the shoes fig 52 Adjusting 1f2 and 31 Ton 81 0 cause a slight drag on the brake drum 4 When the drag condition is reached turn the adjusting cover in the opposite direction four 4 notches Repeat this operation on each shoe in each brake NOTE The backing oft of the adjusting cover the specified num ber of notches will be indicated by 3 faint click of the cover lock spring as the cov...

Page 52: ...th for the pin to pass through clevis and cable end 4 Apply the parking brake enough to produce a drag at the wheels and check for equal drag at each wheel If one wheel has more drag than the other loosen the parking brake adjustment of the tight wheel until they are equal Re lease brake lever and check to see that the brakes do not drag 5 Tighten the adjusting nuts to maintain correct adjust ment...

Page 53: ...prings 2 wide with from 7 to 9 leaves All models except the Cab Over Engine have a threaded bushing and pin type shackle at the front and a plain bushing and eye bolt at the rear hanger The C O E models have the shackle at the rear and the permanent hanger at the front Care The spring to I beam U bolts should be checked oc casionally to make sure they are tight The shackles and hanger bolts should...

Page 54: ... covered Battery Description A 6 volt 100 ampere hour storage battery is lo cated under the floor board on the right side of the vehicle on all models except the school bus which has a 125 ampere hour battery under the hood Care To aSsure long carefree battery service it is suggested that you register the battery with your dealer and take the ve hicle to him to have the battery serviced If this ca...

Page 55: ...attery will be from 1 275 to 1 300 Battery Cables Care The battery cable terminals must be kept clean and tight Loose or corroded terminals cause hard starting and discharged batteries When corrosion appears on the terminals they should be cleanedin a solution of baking soda and water or ammonia and water After cleaning the top of the battery should be flushed off with clear water To reduce the te...

Page 56: ...em is in good con dition The generator output is controlled by the combined current and voltage regulator which also contains the circuit breaker The circuit breaker points close when the generator voltage is higher than the battery voltage so that current can flow to the battery and open when the generator voltage is lower than the battery voltage to prevent the battery from discharging through t...

Page 57: ... the necessary tests and repairs Lamps Description All Chevrolet trucks are equipped with Sealed Beam headlight units in which the light source the reflector lens and gasket are all assembled in a securely sealed unit Figure 57 shows the component parts of the light With this o F E Fig 57 Headlamp arts A Sealed Beam Unit F VenicaJ Adjustment Screw B Sub Body G Horizontal Adjustment SCl2W C Retaine...

Page 58: ...ound unit push the as sembly into place and install the three attaching scr ws 6 Hook the headlamp rim at the top and pull it down into place In stall and tighten the clamp screw Proper aiming of these powerful lights is most important to assure sufficient illumination of the high way without blinding other motor ists When light aiming is necessary it is advisable to contact your Chev rolet dealer...

Page 59: ...er headlight beam parking lights taillight and stop light circuits Fig 62 Fuse Sox This fuse box also acts as a junction block between the chassis wiring harness and the body wiring harness The fuse box cover is held in place by a spring clip at each end A spare fuse clip containing one fuse is located inside the cover Fuse Replacement In case all lights in anyone circuit should fail to operate it...

Page 60: ...t flanges clean rust scale and straighten flanges 4 Using a brush or cloth swab apply a solution of neutral vegetable oil soap to the inside and outside of tire beads and also to the rim side of tube Do not allow soap solution to run down into tire 5 When mounting tire and tube on drop center rim follow the standard procedure ae sure tire is centered on rim so that beads are out of rim well before...

Page 61: ... the way around and the retaining ring can be moved from its support on the gutter diameter and into the gutter well 4 Insert curved end of tire iron in the square notch in the retaining ring and pry out and up while hold ing the ring down into the gutter at the opposite side fig 63 Continue this operation until the cutawaypor tion of the retaining ring nearest the tire iron spans the outside diam...

Page 62: ...eel rim To pry the ast portion J into place insert the tire iron in the notch liB thus putting tension on the ring and tap the ring with a hammer until it drops into place 7 Inflate slowly to not more than 10 pounds pressure See that the retainer ring is properly seated on its support in the rim gutter tapping lightly with a hammer will help seat it firmly and make sure that the tire bead rests ev...

Page 63: ...ide riD is slightly tapered this design makes removal of the ring much easier 5 Push the valve stem up inside the tire to prevent damage while re moving the tire The tire may be re moved from the rim by following the procedure described in IteI1 4 1 Ph and 2 Ton Tire Changing Mounting 1 Remove all rust scale from the rim side ring and clamp ring 2 Insert tube in tire and inflate until tube is near...

Page 64: ...ubricants are much cheaper than repair bills and should be applied regularly if you are to secure a maximum of useful service from your truck It is consequently important that the proper grade of lubricants be used in accordance with a definite schedule In your selection of the proper brand of oil it is desirable to consider the reputation of the refiner or marketer He is responsible for the quali...

Page 65: ...rosion preventive properties and detergent dispersant characteristics necessary to make it renerally suitable for use in both high speed Diesel and gasoline engines under heavy duty service conditions Regular Premium and Heavy Duty Type Oils The Regular Type or straight mineral motor oils which may be used under moderate or light driving conditions in passenger car engines may be used in light com...

Page 66: ...l to the proper level with the recommended oil Lubrication After 500 Miles After the first 500 miles the crankcase oil should be selected to give the best performance under your individual climatic and driving conditions Fall Wioter Spring During the colder months of the year an oil which will permit easy starting at the lowest atmospheric temperature likely to be encountered should be used When t...

Page 67: ...ble as it would appear on a thermometer the lowest tempera tUre at which the indicated grades of oil will permit easy starting NOTE When in doubt use the lighter grade of oU We recommend the use of 20 W rather than S A E 20 if you an ticipate temperatures to drop to freezing Summer The use of 20 W or S A E 20 oils during the summer months will permit better all around per formance than will the he...

Page 68: ...ages are plugged up When to Change Crankcase Oil Oils have been greatly im proved driving conditions have changed and improvements in engines such as the crankcase ventilating system have greatly lengthened the life of good lubricating oils However to insure continuation of best performance low maintenance cost and long engine life it is necessary to change the crank case oil whenever it becomes c...

Page 69: ...dvisable to let the engine reach normal operat ing temperature before draining the crankcase The benefit of draining is to a large extent lost if the crankcase is drained when the engine is cold as some of the suspended foreign ma terial will cling to the sides of the oil pan and will not drain out readily with the slower moving oil Crankcase Dilution Probably the most serious phase of engine oil ...

Page 70: ...bjected to this type of operation Poor mechanic a condition of the engine such as scored cylinders poor ring fit sloppy or loose pistons faulty valves and poor ignition will increase crankcase dilution Keep your truck in good mechanical condition Poor fuels which contain portions hard to ignite and slow to burn will increase crankcase dilution Use good fuel Water in Crankcase Serious lubrication t...

Page 71: ...ter vapor from condensing no harm will result but when an engine is run in low tempera tures moisture will collect and unite with the gases formed by combustion thus acid will be formed and is likely to cause serious etching or pitting This etching pitting or corrosion when using fuel containing considerable sulphur manifests itself in excessively rapid wear on piston pins camshaft bear ings and o...

Page 72: ...assenger Car Hypoid Axle The truck operates under the most severe lubrication condi tions in low gear under heavy load while the passenger car operates under the most severe lubrication conditions at high speed Recommended Lubricants Rear Axles S AE 90 All Pur pose Gear Lubricant 2 Speed Rear Axles S A E 90 All Purpose Gear Lubricant Transmissions S AE 90 Straight Mineral Oil Gear Lubricant S A E ...

Page 73: ... the recommended lubricant at least twice a year or every 6 000 to 10 000 miles It may be necessary and desirable to drain rear axles and transmissions in trucks subject to severe service more fre quently than recommended above CAUTION Use a light flushing oil to flush out the housings when draining DO NO f use water steam kerosene gasoline alcohol UNIVERSAL JOINT h Ton 116 Wheelbase Models The un...

Page 74: ...ubricated with chassis lubricant 1 Ton Truck 137 1 Ton Conventional Trucks 137 and 161 1 to 2 Ton Heavy Duty Trucks 137 and 161 Wheel Base Cab Over Engine Trucks 134 and 158 Wheel Base The front intermediate and rear universal joints are the needle bearing type equipped with lubrication fittings and should be lubricated with the same type of lubricant used in the trans mission CAUTION Under no con...

Page 75: ... BEARINGS All Models Except Cab Over Engine l h Ton School Bus and 2 Ton Heavy Duty Trucks Front wheels are equipped with ball bearings and should be packed with a high melting point front wheel bearing lubricant Cab Over Engine 1 h Ton School Bus and 2 Ton Heavy Duty Truck Models Front wheels are equipped with Barrel type roller bearings and should be packed with a soft smooth lubricant Fibrous o...

Page 76: ...n the cab over engine truck models are equipped with pressure gun lubrication fittings On the other truck models only the brake pedal is equipped with a pressure gun lubrication fitting the lubricant so ap plied lubricates both the brake pedal and the clutch pedal Use chassis lubricant at these points Steering Gear Lubrication The steering gear is filled at the factory with an all season gear lubr...

Page 77: ...nd will have similar operating characteristics the year around The shock insulation fluid recommended should have a viscosity of from 70 to 80 seconds at 100 F Saybolt Univer sal and should not exceed 975 to 1 000 seconds at 20 F This type of fluid is carried by all Chevrolet Dealers NOTi Do not under any circumstances use a shock insulation fluid heavier in viscosity or body than that recommended...

Page 78: ... Front Spring Bolt 1 each side 1000 mile 9 Distributor 1 cup 1000 mile 10 Steering Gear see page 74 1000 mile 11 Starting Motor 1 oil cup see page 70 1000 mile 12 Air Cleaner see page 26 2000 mile 13 Throttle Bell Crank 1000 mile 14 Transmission see page 70 15 Rear Spring Bolt 1 each side 1000 mile 16 Brake Pedal Shaft 1000 mile 17 Rear Axle see page 70 18 Rear Spring Shackle 2 each side 1000 mile...

Page 79: ...6 15 o a 6 o J o o o 80 0 o 8 0 0 18 15 11 6 3 1 ol 8RICATE EVERY 1000 MILES a LUBRICATE EVERY 2000 MILES o LU8RICATE EVERY SOOO MkES oLUBRICATf EVERY 1 1 000 MILES ...

Page 80: ...ibutor 1 cup 1000 mile 10 Front Spring Bolt 1 each side 1000 mile 11 Starting Motor 1 oil cup see page 70 1000 mile 12 Air Cleaner see page 26 2000 mile 13 Brake Pedal 1000 mile 14 Throttle Bell Crank 1000 mile 15 Transmission see page 70 16 Universal Joints 1 each see page 71 1000 mile 17 Propeller Shaft Slip Joint 1000 mile 18 Rear Spring Bolt 1 each side 1000 mile 19 Rear Axle see page 70 20 Re...

Page 81: ...13 12 10 8 7 0 0 0 8 0 0 0 800 8 0 8 c 2 I i 0 i c t e g n 3 0 0 0 0 0 0 8 0 0 0 B 20 19 18 I I n 10 9 oLUBRiCATE ERY 1000 MILES oLUBRICATE EVERY 2000 MILES oLUBRICATE EVERY 5000 MILES oLUBRICATE EVERY 10 000 MILES ...

Page 82: ... Steering Gear see page 74 1000 mile 11 Starting Motor 1 oil cup see page 70 1000 mile 12 Air Cleaner see page 26 2000 mile 13 Universal Joints 1 each 1000 mile 14 Throttle Bell Crank 1000 mile 15 Transmission see page 70 16 Rear Spring Bolt 1 each side 1000 mile 17 Rear Axle see page 70 18 Rear Spring Shackle 2 each side 1000 mile 19 Propeller Shaft Bearing Support see page 42 20 Brake Pedal 1000...

Page 83: ...IS 2 I 8 7 0 0 0 000 G 000 0 0 0 S 0 3 e r 2 0 0 I e DO 0 c 0 0 0 0 e 0 0 0 B 0 0 18 I Il II 9 8 3 I ol U8SlKAll IVERY 1000 MUS olUBRICATf EVUY 2000 MIlES olUBIttCATI EVOY sooo NtW ollUlCATf EVaY 1 0 000 MILES ...

Page 84: ...s trouble may be caused by battery cables starter switch or starting motor Check for faulty bat tery cables or loose connections have the starter tested and necessary repairs made 3 1n some cases the trouble may be within the engine and caused by unusually heavy oil in cold weather overheating the engine or an unusually tight engine If the engine has been overheated the engine should be allowed to...

Page 85: ...ecially in cold weather This is due to the fact that cranking the cold engine places such a strain on the battery that it does not supply a suitable ignition spark In this case it may be possible to start the engine by pushing or towing the vehicle with the transmission in high gear after which it should be taken to your dealer to have the battery and ignition system checked Avoid using the starte...

Page 86: ...termine which cylinder may be missing Remove the questionable plugs and clean inspect and set the point gap at 040 If the plugs are thought to be faulty they should be replaced with plugs of the same make and number 3 A flooded carburetor may also cause a rough running en gine When the carburetor is flooded there is usually fuel on the outside of carburetor body Sometimes tapping on the body with ...

Page 87: ...r for repairs Engine Noises Certain fuels may produce a pronounced knock or ping on acceleration only Although this is annoying it does not seriously damage the engine It may be eliminated or decreased by the use of higher octane fuel retarding the oc tane selector setting or by having the engine tuned up by your dealer Ifa pronounced noise is noted check to see that there is normal oil pressure a...

Page 88: ...er this may freeze the lock cylinder so that it cannot be unlocked If the truck cannot be taken to a warm garage to thaw out and dry the lock it is generally pos sible to heat the key with a match and insert it in the lock After repeating this a few times the lock will absorb enough heat to thaw out and unlock If this trouble is experienced the lock should be removed dried and lubricated Hydrovac ...

Page 89: ...e from defects in material and workmanship under normal use and service its obligation under this warranty being limited to making good at its factory any part or parts thereof which shall within ninety 90 days after delivery of such vehicle to the original purchaser or before such ve hicle has been driven 4 000 miles whichever event shall first occur be returned to it with transportation charges ...

Page 90: ... explains the services you may rightfully expect where they can be obtained and how to get them It formally introduces you to any Chevrolet dealer who will gladly administer to your motoring needs The Chevrolet lOOO mile coupon attached to the policy pro vides a thorough inspection and adjustment of the functional parts of the truck as well as a complete lubrication at no charge to you except for ...

Page 91: ...ossible price consistent with this quality Protect your investment by having your replacement re pair and maintenance work done by an Authorized Chevrolet Service Station who has all the necessary tools and the fac tory trained men Repair Parts Genuine Chevrolet parts manufactured to the same rigid specifications as the parts used in the original as sembly of the truck are stocked by Authorized Ch...

Page 92: ... 30 gal Cooling System Except 2 Ton C O E and Special Heavy Duty Radiator 15 qts 2 Ton C O E and Special Heavy Duty Radiator 17 5 qts LAMP BULB CHART Location C P Bulb No Headlamp 45 35 watts Sealed Beam Parking Lamp 3 63 Tail and Stop Lamp Panel Models 1 Bulb 21 3 All Others 2 Bulbs 3 Instrument Cluster 2 Ignition Lock 2 Dome Lamp 15 SPECIFICATIONS Wheelbase 1154 63 55 55 87 h Ton 116 A Ton 125 I...

Page 93: ... Rated 90 93 Conventional 90 C O E Maximum Torque ft lbs Number of Main Bearings 174 4 192 Conventional 189 C O E Transmission Ratios 3 Speed First low 2 94 to 1 Second 1 68 to 1 Third Direct Fourth Reverse 2 94 to 1 Rear Axle Ratios Type h Ton Semi floating Hypoid Ton Full floating Hypoid I Ton Full floating Hypoid 1 hcTon R P O Full floating Hypoid l h Ton regular Full floating Hypoid 2 Ton Full...

Page 94: ...rburetor idling adjustment conv l t to 2 1 turns open Engine idling speed 450 to 500 R P M Intake valve clearance 006 to 008 hot Exhaust valve clearance 013 to 015 hot Heavy duty operation intake 010 hot Heavy duty operation exhaust 020 hot Clutch pedal free trav el 0 4 to 1 1 Brake pedal toe board clearance lJ4 Brake shoe release after slight drag is felt Ton Ton front rear 4 adj cover notches Al...

Page 95: ...Ton 3600 FR 3800 Fa 81eat 8 leaf Btl vy II ieat aad aUJllUary brake boodter and heavy duty frame 4 n 3 73 4 11 7 5 H fUr u t 00 lJi Ton Speelal RPB R ItS naa RV8 and RWS 8erles 8 25 20 10 ply_ r Relrular ProduetloQ Option tor tbe Front wllh DO aJlowable louease 10 15 000 lb OVW Never use an EI ra Ply Ratlol blJh presaure Front wlUl Ballooo Rear ...

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Summary of Contents for 1948 heavy duty

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Chevrolet 1948 heavy duty, Operator'S Manual

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Summary of Contents for 1948 heavy duty

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