Lubricating Joints that have Grease Fittings

Refer to the illustration for the location of the grease fittings

Important: Wipe off all dirt from the grease fitting before lubricating the joint. Ball joints should not be lubricated unless the temperature of the ball joints is -12°C (+10°F) or higher. During cold weather, allow the ball joint to warm up as necessary before being lubricated.

Use a low-pressure grease gun on all joints in order to prevent seal damage.

Apply grease slowly while watching the grease seal. Apply the grease until the grease is seen bleeding from the seal. If the seal expands but you do not see any grease, do not apply any more grease. Allow time for the grease to bleed from the seal.

Lubricate the steering linkage, the upper and the lower ball joint.

Footnotes

[Dagger] The U.S. Environmental Protection Agency or the California Air Resources Board has determined that the failure to perform this maintenance item will not nullify the emission warranty or limit recall liability prior to the completion of the vehicle's useful life. It is recommended that all maintenance services be performed at the indicated intervals and the maintenance be recorded.

1. If your vehicle has an Allison automatic transmission your GM owner's manual is supplemented by an Allison Transmission Operator's Manual. Always refer to these manuals for related maintenance services.
2. Refer to the Caterpillar Diesel Engine Operation and Maintenance Manual for oil recommendations and change intervals.
3. An Emission Control Service.
4. A Noise Emission Control Device.
5. Applies only to vehicles sold in the United States.
6. Check fluid level in following components:

•	Master Cylinder

•	Power steering pump

•

Axle

•	Transmission and hydraulic spring parking brake pump (if equipped)

•	A low fluid level in the brake master cylinder can indicate worn brake linings and should be checked accordingly.

7. Inspect brake lines and hoses for the following:

•	Proper hook-up

•

Binding

•

Leaks

•

Cracks

•	Chafing and etc.

8. Inspect parking brake drum and linings for wear or cracks and check linkage and adjustment.
9. This vehicle has the GM Oil Life System. This system will show you when to change the engine oil and filter--usually between 5 000 km (3,000 miles) and 12 000 km (7,500 miles) since your last oil change. Under severe conditions, the indicator may come on before 5 000 km (3,000 miles). Never drive your vehicle more than 12 000 km (7,500 miles) or 12 months without an oil and filter change.

Remember to reset the Oil life System whenever the oil is changed. For more information, see "Change Oil Light" in the index.

10. Inspect rear axle air shift motor for fluid leaks. Remove plug to check fluid level. Inspect air lines and hoses for proper hook-up, binding, leaks, etc. inspect at 5 000 km (3,000 miles) thereafter.
11. Chassis Lubrication Service--Lubricate all grease fittings in front suspension, front axle and steering linkage. DO NOT lubricate kingpin bushings with air pressure equipment; instead, use a hand grease gun to ensure complete purge and eliminate sealer cap distortion. Lubricate transmission and shift linkage, hood latches and hood hinges, parking brake lever pivot, clevis pins and linkage, disc brake caliper rails, clutch linkage and release bearing (if equipped), bearing pads, propshaft universal joints, brake camshaft bracket, slack adjusters, pedal shaft, clutch cross shaft and clutch pedal springs. Lubricate suspension, axle and steering linkage more often when operating under dusty or muddy conditions and in excessive off-road use.
12. Check steering system:

•

Look for damaged, loose or missing parts. Also look for parts showing signs of wear or lack of lubrication. Replace parts as needed. Also check steering gear mounting bolts, pitman arm nut, gear housing upper cover and side cover attaching bolts, steering column mounting bolts and cardan joint clamp bolts; tighten if necessary.

•	Inspect power steering hoses, tubes and fittings for leaks. Hoses and lines must not be twisted, kinked or tightly bent. Make sure clips, clamps, supporting tubes and hoses are in place and properly secured.

•	Check steering gear for leakage around pitman shaft and housing. If leakage is evident (lubricant oozing out, not just oily film), leak should be corrected immediately.

13. Check front and rear suspension. Look for damaged, loose or missing parts or parts showing signs of wear or lack of lubrication. Replace parts as needed.
14. Adjust tire pressures as indicated on the GVW Rating label for optimum tire life. Check tires for excessive or abnormal wear or damage. Also check for damaged wheels. Replace wheels and/or tires as needed.
15. Check spring-to-axle U-bolts and shackle bolts for proper torque. When parts are replaced the torque must be checked and adjusted more often during the first 10 000 km (6,000 miles). Check torque at 800 km (500 miles) and 3 000 km (2,000 miles) after first use of parts.
16. Check complete exhaust system and cab areas near the exhaust system for broken, damaged, missing or out-of-position parts. Also inspect for open seams, holes, loose connections or other conditions which could let exhaust fumes seep into the driver compartment. Needed repairs should be made at once. To help maintain system integrity, replace exhaust pipes whenever a new muffler is put on.
17. Check all gasoline engine drive belts for cracks, fraying and wear. Replace as needed.
18. With the engine off and below normal operating temperature, check to see that the thermostatically controlled engine cooling fan can be rotated by hand on viscous-operated drives. Replace as needed.
19. Check shields and underhood insulation for damage or looseness. Adjust or replace as needed.
20. Wheel bearing service

•	Grease type--Clean, inspect and lubricate with the proper wheel bearing grease at designated intervals or when hubs are removed. Refer to Fluid and Lubricant Recommendations .

•

Oil-filled type--Some wheel bearings are lubricated by rear axle lubricant. When you have oil-filled hubs, use lubricant identical to that used in your rear axle. Lubricant change intervals are the same for front and rear axles. However, you must maintain oil level at the OIL LEVEL mark between change intervals. Refer to Fluid and Lubricant Recommendations .

21. Check the air intake system installation to see that gaskets are seated properly and all hose connections, fasteners and other components are tight. Tighten connections and fasteners or replace parts as required.
22. Evaporative Control System Service, if equipped--Check all fuel and vapor lines and hoses for proper connections and correct routing, or every 24 months, whichever occurs first. Replace parts as needed.

•	Check all fuel and vapor lines and hoses for proper connections and correct routing, or every 24 months, whichever occurs first.

•	Replace parts as needed.

23. Replace spark plugs. Inspect wires for damage. Check the wire boot and boot heat shield fit at spark plugs and coil. Replace parts as needed.
24. Check the fuel tank, fuel cap and fuel lines for damage which could cause leakage. Inspect fuel cap for correct sealing ability and any indications of damage. Check fuel cap gasket for even filler neck imprint. Replace parts as needed.
25. Check EGR system.
26. Inspect Electronic Vacuum Regulator Valve (EVRV) filter for excessive contamination or plugging. If needed, clean filter with solution of soap and water, let dry and s=install.
27. Drain, flush and refill cooling system. Refer to Fluid and Lubricant Recommendations for what to use. Inspect hoses, clean radiator, condenser, pressure cap and neck. Pressure test cooling system and pressure cap. For Caterpillar® diesel engines, always refer to the Caterpillar Diesel Engine Operation & Maintenance Manual for coolant recommendations and change intervals.
28. Rear axle service--Change the lubricant. Refer to Fluid and Lubricant Recommendations .
29. Front axle service--Re-pack upper kingping roller bearing.
30. Air brake service:

•

Inspect brake lines and hoses for proper hook-up, binding, leaks, cracks, chafing, etc. Inspect drum brake linings for wear or cracks. Inspect other brake parts at each wheel, including drums, wheel cylinders and piston heat shields, boots and wheel speed sensor wiring. Check brake pedal for excessive free play or travel (or every 6 months, whichever occurs first) and have serviced if needed. Check brakes more often if driving habits and conditions result in frequent braking. Replace air dryer cartridge only if excessive oil or moisture is present. A small amount of oil in the system is normal and should not be considered as a reason to replace the cartridge.

•	Test air lines for leaks. Tighten as needed. Replace compressor filter.

•	Inspect air parking brake chamber for leaks and damage. Inspect lines and hoses for leaks, cracks, chafing, etc. Also check all attachments for tightness, wear or damage. Note: The spring brake section of the rear brake diaphragms are non-serviceable.

•	Replace the air compressor filter element, mounted on the air compressor. For remote air compressor intake service.

•	Remove, disassemble, clean and inspect the safety valve, standard brake chamber, quick release valve, quick release/double check valve combination, parking brake control valve, double check valve, pressure protection valve and alcohol injector.

•	Remove, disassemble and clean the application valve. Replace parts showing wear.

•	Remove, disassemble, clean and inspect the spring brake control valve. Replace rubber parts.

31. Clean and lubricate air brake automatic slack adjuster. Check pushrod travel and auto adjustment operation. Have serviced if needed.
32. Air brake chamber service--Check operation, mounting, clamps and air lines and check for leaks.
33. Trailer brake hand control valve service--Check operation. Lubricate cam and follower.
34. Tighten the wheel stud nuts to the specified torque values at 160 km (100 miles) after each time the wheel is removed.