WHEELS AND TIRES (Contd)
Engage parking brake and chock wheels on both sides to keep vehicle from rolling. Failure to do so may
result in injury to personnel.
Tire Removal (M939 series vehicles).
Remove hydraulic jack (10), jack handle (12), wheel stud nut wrench (1), and wrench handle (14) from
tool compartment. Remove spare tire from storage location.
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 (14) through wheel stud nut wrench (1) and position wrench (1) on wheel stud nuts
(2). Loosen ten wheel stud nuts (2) but do not remove.
Turn jack screw (9) of jack (10) out approximately 3 in. (7.6 cm) by hand.
Turn valve (11) at base of jack (10) by turning clockwise with slotted end of jack handle (12) 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 M934 models before jacking vehicle up.
Position jack (10) under axle housing (8) near tire to be removed. Insert jack handle (12) into jack (10).
Move jack handle (12) up and down until tire is off the ground.
Use special second wheel stud wrench NSN 5120-00-378-4411 to hold inner adapter spacer nuts in place
when braking outer lug nut.
If rear dual tire is to be replaced, remove ten wheel stud nuts (2) from adapter spacer nuts (4) and outer
tire (3) from axle hub (13). If rear inner wheel (6) is to be removed, reverse wheel stud nut wrench (1), remove handle
(14), and install near large end of wrench (1). Remove ten adapter spacer nuts (4) and inner tire (6).
If front tire is to be replaced, remove ten wheel stud nuts (2) from studs (7) and tire (6) from hub (13).