Maintenance Schedule - Hummer H1 Service Manual

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MAINTENANCE SCHEDULE

Recommended Maintenance
Maintenance recommendations in this section were developed
to maintain satisfactory vehicle operation. Items described in
Maintenance Inspection Groups A, B, and C are important to
proper operation, performance, and safety.
It is important that maintenance items outlined in the schedules
be performed at suggested intervals. Regular maintenance will
greatly improve vehicle reliability and longevity.
Normal Maintenance
The vehicle maintenance schedules reflect services required
for normal operation. Normal operation includes city/highway
driving on hard surface roads with only minimal operation on
unpaved road surfaces.
Maintenance After Severe Operation
Severe operation includes extensive off-road driving, salt water
fording, commercial use, sustained operation in high ambient
temperatures, and trailer towing. This type of vehicle operation
requires additional and more frequent service. If the vehicle is
going to be used frequently in severe operating situations,
maintenance should be done on an hourly rather than a mileage
schedule, as shown in the Scheduled Maintenance Chart on
page 1Ð22 . To keep track of the hours of severe operation, an
optional hourmeter can be installed at your Hummer dealer.
Commercial use involves regular operation as a delivery or ser-
vice type vehicle. Severe off-road use involves extended opera-
tion on rough terrain, stream fording, salt water fording, or
sustained operation in sand, mud, snow, or dirt surfaces. Severe
operation also includes prolonged daily operation in heavy
trafÞc when ambient temperatures are high.
The additional maintenance required immediately after severe
off-road operation is as follows:
¥ Wash the vehicle underbody, driveline and brake compo-
nents, and all steering linkage and suspension parts with a
low pressure fresh water spray.
¥ If vehicle was driven over rough terrain, examine the
underbody and driveline components for impact damage.
Also check for leaks and loose parts.
¥ If the vehicle was driven through deep water, examine
geared hub, axle and vent lines for water contamination. If
the lines have become disconnected, these components
may become water contaminated. Also inspect the axle
and hub vents if required.
¥ Check the front/rear brake pads for contamination by dirt,
mud, sand, etc. Replace the pads if foreign material has
become embedded in the lining. However, if the pads are
only wet from water, allow them to air dry, or drive the
vehicle about a block with the brakes lightly applied to
heat and dry the pads.
¥ Check transmission and transfer case ßuid levels and con-
dition. Drain and replace the ßuid in either assembly if
05745159
General Information, Lubrication and Maintenance
water contamination is evident. If water contamination
proves extensive, it will also be necessary to replace the
transmission ßuid Þlter, and ßush the transmission ßuid
cooler and lines.
¥ Lubricate the steering linkage, ball joints, propeller shaft,
and body lubrication points.
¥ Check the brake and power steering ßuid levels and top off
as needed.
¥ Examine the engine air Þlter. Replace the Þlter element if
necessary and clean the air Þlter housing and dust
unloader.
¥ Change engine oil and replace engine oil Þlter.
Maintenance Inspection Groups A-B-C
The inspection groups outline additional components to be
checked at stated mileage intervals. The intervals are described
in your maintenance booklet. Perform necessary service repair,
replacement, or adjustments as each inspection item is
checked.
Maintenance Inspection Group A:
¥ Check ßuid levels and condition for power steering pump,
cooling system (reservoir and surge tank), brakes, trans-
mission, transfer case, geared hubs, and axles.
¥ Check CDR valve for oil saturation.
¥ Inspect condition of control arms, springs, and shock absorb-
ers.
¥ Check tire wear and condition.
¥ Lubricate all grease Þttings and body lubrication points.
¥ Inspect geared hubs for leaking seals or damage.
¥ Inspect service brakes and parking brake.
¥ Check axles for leaks or damage.
¥ Check torque of wheel half nuts and lug nuts.
¥ Inspect condition of geared hub and axle vent lines.
¥ Inspect condition of transmission and transfer case vent lines.
¥ Inspect U-joints for wear or missing/damaged grease Þttings.
¥ Inspect condition of engine mounts and insulators.
¥ Inspect transmission/transfer case shift linkage for wear,
binding, distortion.
¥ Check fuel Þlter and drain/clean if necessary.
¥ Check CTIS operation. Verify that system inßates/deßates
tires.
¥ Check winch operation and cable condition (if equipped).
Free-spool out and pay-in at least 30 feet of cable.
¥ Check ball joints for wear.
¥ Test drive vehicle and complete a functional check of all
systems.
¥ Check air cleaner.
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