BUMPERS

TIRES Tire Rotation

To equalize wear it is recom m ended th at the tires be rotated every 6,000 miles. U pon rotation, tire pressure m ust be adjusted (fro n t and rear) in accordance w ith the recom m endations for tire inflation pressure in the Load Capacity Chart on page 4.

S T E E R I N G

STANDARD STEERING

Check the steering gear to frame bolts regularly to be certain they are tight. Keep the pitm an arm to pitm an shaft n u t tight. Keep the housing side and end covers tight to prevent lubricant loss and prevent steering from loosening. Seasonal change o f this lubricant is unnecessary and the housing should not be drained.

The steering gear is factory-filled w ith steering gear lubricant. Seasonal change o f this lubricant should n o t be perform ed and the housing should not be drained—no lubrication is required for the life o f the steering gear. Every 36,000 miles, the gear should be inspected for seal leakage (actual solid g rease-n o t ju st oily film). If a seal is replaced or the gear is overhauled, the gear housing should be refilled w ith No. 1051052 (13 oz. container) Steering Gear Lubricant which m eets GM Specification GM 4673M , or its equivalent.

NO TE: Do not use EP Chasis Lube, which meets GM Specification GM 6031M , to lubricate the gear. DO NO T O V E R -F IL L the gear housing.

NO TE: Do lubricate intermediate steering shaft with water resistant EP chassis grease which meets General Motors Specification No. GM 6031M every 6,000 miles.

POWER STEERING

Power steering assist is provided by a hydraulic pum p driven by the engine. When the engine is n ot running or if the power steering pum p drive belt breaks, the vehicle can still be steered, b ut m uch greater steering effort will be required.

Service gear box in the same m anner as prescribed for the conventional or standard steering gears. In addition, for all models, check fluid in pow er steering pum p reservoir—while h o t and wheels in full left turn position—make additions using GM Power Steering Fluid or if n o t available use A utom atic Transmission Fluid—DEXRON or equivalent required to bring level to full m ark on filler cap dipstick.

S U S P E N S IO N

C A U T IO N :. Certain driving conditions such as dust storms and frequent driving on dusty roads necessitate more frequent lubrication periods.

Maintain correct front end alignment to provide easy steering, longer tire life, and driving stability.

INDEPENDENT FRONT SUSPENSION

Check control arm bushings and ball join ts for wear.

Lubricate tie rods, upper and lower control arms, and ball joints at fittings w ith w ater resistant EP chassis grease w hich meets General M otors Specification No. GM 6 0 3 1M every 6,000 miles.

NO TE: Ball joints must be at +10°F. or more before lubricating.

REAR SUSPENSION

Keep spring to axle U bolts and shackle bolts properly tightened. Check U bolt nuts after the first 1,000 miles of operation if the U bolt or U bolt nuts are changed in service.

Model

GA-10-20 GA-30 “U ” Bolt Torques-R ear

Diameter

9 /1 6 " 5/8" Torque in Ft. Lbs.

115-125 125-175

T A C H O M E T E R - M E C H A N I C A L

Lubricate drive cable w ith SAE 90 m ulti-purpose gear lube every 6,000 miles.

B O D Y L U B R IC A T IO N

Normal use o f truck causes metal-to-metal movem ent at certain points in the cab body. Noise, wear and im proper operation at these points will result when a protective film of lubricant is not provided.

For exposed surfaces, such as door checks, door lock bolts, lock striker plates, dovetail bum per wedges, etc., apply a thin film of light engine oil.

Where oil holes are provided in body parts a dripless oil can be safely used, but any lubricant should be used sparingly, and after application all excess should be carefully wiped off.

The seat adjusters and seat track and sliding door track, ordinarily overlooked, should be lubricated w ith w ater resistant EP chassis grease w hich m eets General M otors Specification No. GM 6 0 3 1M.

There are other points on bodies which may occasionally require lubrication and which are difficult to service. Window regulators and controls are confined in the space betw een the upholstery and the outside door panel. Easy access to the working parts may be made by removing the trim . Door weatherstrips and rubber hood bumpers should be lightly coated w ith a rubber lubricant.