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General Maintenance Articles


Suggested H1 & HMMWV Maintenance Schedules


VehicleService Interval
H1 up to 19973,000 • 6,000 • 12,000 • 15,000 • 30,000 • 57,000 • 60,000 Miles
H1 1997 and After3,000 • 6,000 • 12,000 • 15,000 • 24,000 • 36,000 • 60,000 Miles
General MaintenanceGroup A • Group B • Group C

H1, up to 1997

3,000 Miles (4,800 km)
9,000 • 15,000 • 21,000 • 27,000 • 33,000 • 39,000 • 45,000 • 51,000 • 57,000 • 63,000
Check!Change engine oil and replace filter.
Check!Check alignment and toe-in, toe-out.
Check!Check items in Maintenance Group A.
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6,000 Miles(9,600 km)
18,000 • 30,000 • 42,000 • 54,000 • 66,000 • 78,000 • 90,000 • 102,000 • 114,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Check items in Maintenance Groups A & B
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12,000 Miles (19,000 km)
24,000 • 36,000 • 48,000 • 60,000 • 72,000 • 84,000 • 96,000 • 108,000 • 120,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Change engine coolant.
Check!Change transmission fluid and transfer case fluid.
Check!Check alignment and toe-in, toe-out.
Check!Check items in Maintenance Groups A, B & C.
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15,000 Miles (24,000 km)
21,000 • 27,000 • 33,000 • 39,000 • 45,000 • 57,000 • 63,000 • 69,000 • 75,000 • 81,000 Miles
Check!Change engine oil and replace filter.
Check!Check items in Maintenance Group A.
Back to Top

30,000 Miles (48,000 km)
96,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Check alignment
Check!Check items in Maintenance Groups A & B.
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57,000 Miles (91,700 km)
63,000 • 69,000 • 75,000 • 81,000 • 87,000 • 93,000 • 99,000 • 105,000 • 111,000 • 117,000 Miles
Check!Change engine oil and replace filter.
Check!Check items in Maintenance Group A.
Back to Top

60,000 Miles (65,500 km)
24,000 • 36,000 • 48,000 • 60,000 • 72,000 • 84,000 • 96,000 • 108,000 • 120,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Change engine coolant.
Check!Change transmission fluid and transfer case fluid.
Check!Check alignment and toe-in, toe-out.
Check!Check items in Maintenance Groups A, B & C.
Back to Top

H1, 1997 and Up

3,000 Miles (4,800 km)
9,000 • 15,000 • 21,000 • 27,000 • 33,000 • 39,000 • 45,000 • 51,000 • 57,000 • 63,000 Miles
Check!Change engine oil and replace filter.
Check!Check items in Maintenance Group A.
Back to Top

6,000 Miles (9,600 km)
18,000 • 30,000 • 42,000 • 54,000 • 66,000 • 78,000 • 90,000 • 102,000 • 114,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Check items in Maintenance Groups A & B
Back to Top

12,000 Miles (19,000 km)
72,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Change geared hub oil.
Check!Change axle oil.
Check!Change engine coolant.
Check!Change transmission fluid and transfer case fluid.
Check!Change transmission filter.
Check!Check items in Maintenance Groups A, B & C.
Back to Top

15,000 Miles (24,000 km)
Check!
Check!Change engine oil and replace filter.
Check!Check items in Maintenance Group A.
Back to Top

24,000 Miles (38,6000 km)
48,000 • 84,000 • 108,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Change engine coolant.
Check!Change transmission fluid and transfer case fluid.
Check!Change transmission filter.
Check!Check items in Maintenance Groups A & B
Back to Top

36,000 Miles (58,0000 km)
96,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Change engine coolant.
Check!Change transmission fluid and transfer case fluid.
Check!Change transmission filter.
Check!Change geared hub oil.
Check!Change axle oil.
Check!Check items in Maintenance Groups A & B
Back to Top

60,000 Miles (65,500 km)
120,000 Miles
Check!Change engine oil and replace filter.
Check!Clean or replace air filter.
Check!Replace fuel filter element.
Check!Change engine coolant.
Check!Change transmission fluid and transfer case fluid.
Check!Change transmission filter.
Check!Inspect fuel tank, fuel cap and fuel lines.
Check!Change geared hub oil.
Check!Change axle oil.
Check!Drain and replace brake fluid.
Check!Check items in Maintenance Groups A, B & C.
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General Maintenance Groups

Group A (approx. 1.0 hours of labor)
Check items in Maintenance Group A
Check!Check fluid levels and condition of power steering, pump, cooling system, (reservoir tank), brakes, transmission, transfer case, geared hubs and axels.
Check!Check CDR valve for oil separation.
Check!Inspect condition of control arms, springs, and shock absorbers.
Check!Check tire wear and condition.
Check!Inspect geared hubs for leaking seals or damage.
Check!Inspect service brakes and parking brake.
Check!Check axels for leaks or damage.
Check!Check wheel bolt and nut torque.
Check!Inspect condition of transmission and transfer case vent lines.
Check!Inspect U-joints for wear or missing / damaged grease fittings.
Check!Inspect transmissions / transfer case shift linkage for wear, binding, loose, excessive play.
Check!On non-turbo models. Inspect accelerator linkage for wear binding, distortion.
Check!Inspect condition of engine mounts and insulators.
Check!Check fuel filter and drain / clean if necessary.
Check!Check CTIS operation. Verify that system inflates / deflates tires and has no leaks.
Check!Check winch condition. Payout and pay-in at least 30' of cable.
Check!Inspect ball joints for wear.
Check!Check air cleaner.
Check!Test drive vehicle and complete a function check of all systems.
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Group B (approx. 5.6 hours of labor)
Check items in Maintenance Group B
Check!Inspect fuel injection pump, lines and fittings for leaks or damage.
Check!Check battery voltage and condition. Clean battery exterior with ammonia / water or baking soda mixture.
Check!Inspect serpentine belt condition.
Check!Inspect exhaust system and shields.
Check!Inspect and rotate tires.
Check!Inspect half-shaft boots and ball joint seals.
Check!Inspect condition of steering column, u-joints, tie-rods, steering arm, center link, and idler arm.
Check!Check fuel tank line filter.
Check!Inspect condition of frame rails and cross-members.
Check!Check A/C system operation.
Check!Check wheel alignment.
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Group C (approx. 8.0 hours of labor)
Check items in Maintenance Group A
Check!Inspect surge tank, radiator and shroud, A/C condenser.
Check!Power steering and transmission coolers and all hoses and fittings for security of mounting, leaks, or damage.
Check!Inspect fuel tank, lines and cap.
Check!Inspect all wiring harnesses for frays, splits, missing insulation, poor connections.
Check!Inspect power steering pump, power steering gear, hoses, lines and fittings for leaks or damage.
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