WHEELS AND TIRES (Contd)
Tire Removal (M939A1 series vehicles).
Engage parking brake and chock wheels on both sides. Failure to do so may result in injury to personnel.
Remove hydraulic jack (9), jack handle (7), wheel stud nut wrench (2), and wrench handle (1) from tool
compartment. Remove spare tire from storage location.
This procedure requires two personnel.
Wheel stud nuts on left side have left-hand threads. Those on right side have right-hand threads.
Studs and nuts are marked L and R accordingly.
Install wrench handle (1) through wheel stud nut wrench (2) and position wheel stud nut wrench (2) on
wheel stud nuts (3). Loosen ten wheel stud nuts (3) but do not remove.
Turn jack screw (10) of jack (9) out approximately 3 in. (7.6 cm).
Turn valve (8) at base of jack (9) by turning clockwise with slotted end of jack handle (7) until closed
Do not work under vehicle supported by jack only. Jack may slip causing vehicle to fall, which will result in
injury or death.
Place a block under jack if used on soft terrain.
Use jack stands if available.
Expansible van bodies must be retracted on M934A1 model trucks before jacking vehicle up.
Position jack (9) under axle housing (6) near tire (4) or (12) to be removed. Insert handle (7) into jack
(9). Move jack handle (7) up and down until tire (4) or (12) is off the ground.
Remove ten wheel stud nuts (3) from studs (11) and tire (4) or (12) from hub (5).