How to change the oil on geared hubs on a HMMWV

Kooker Tech
38586 Webb Dr.
Westland, MI 48185
Phone: 734-326-3900 x212
Email: [email protected]

Gear Hub Oil Change

Tools
- ½” Air Impact
Carlyle 6-231
https://kookertech.com/products/carly...
- 7/8” Deep 6pt. Impact Socket for ½” Drive
Carlyle 61-4228
https://kookertech.com/products/carly...
- ½” Drive Extension 3”
Carlyle EXT1203
https://kookertech.com/products/carly...
- 3/8” Rachet-
Carlyle R38QR
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- 3/8” Torque Wrench (need to be able to do 8-13 ft lbs)
Pittsburgh 63880
https://kookertech.com/products/pitts...
- ½” Torque Wrench (need to able to do 90-110 ft lbs)
Carlyle TW12RH1
https://kookertech.com/products/carly...
- 1” shallow socket 6pt for ½” Drive
Carlyle S12032
https://kookertech.com/products/carly...
- 3/8” to ½” Adapter
Carlyle ADP3812
https://kookertech.com/products/carly...
- 5/16” Allen socket for 3/8” Drive
Carlyle SH3810
https://kookertech.com/products/carly...
- Hydraulic Jack
Carlye 791-6450
https://kookertech.com/products/carly...
- Jack Stand
Carlye 791-5050
https://kookertech.com/products/carly...
- Oil Pan
Hopkins 11838
https://kookertech.com/products/hopki...
- Wire Brush
NAPA 7771040
https://kookertech.com/products/napa-...
Materials
- 2 Liters of 80/90 Gear Oil (1 pint 0.47 liters Per Hub)
Valvoline 280
https://kookertech.com/products/valvo...
- Brake Clean
CRC 091314
https://kookertech.com/products/napa-...
- Rags
NAPA 7604140
https://kookertech.com/products/napa-...


Start repairs
1. Jack up truck and remove wheel/tire assembly
2. Check hubs for any possible leaks
3. Clean area around drain plug and fill plug
4. Place drain pan under gear box
5. Remove drain plug
6. Allow oil to drain
7. Check oil for any issues
8. Reinstall drain plug and tighten to spec
9. Remove fill plug
10. Refill with (1 pint or 0.47 liters of 80/90 gear oil)
11. Reinstall fill plug and tighten to spec
12. Clean hub of any remaining grease
13. Reinstall wheel/tire assembly
14. Tighten lug nuts to 90-110 ft lbs
15. Lower vehicle back down