2-89. AIR CHAMBER REPLACE (WPES-10 AND H-9518-1) - continued.
Towing ROWPU, even at low speed with brakes disabled could cause a serious accident.
This procedure is necessary when trailer is to be moved without a towing vehicle
supplying air-pressure to release the brakes.
To ensure combat readiness of vehicle, enable brakes as soon as short distance
move, or other reason for disabling brakes, is completed.
Disabling service brakes.
Using a 10 ton jack and jack stand, raise tire and wheel assembly off the ground, high enough to
permit turning (rotating) the tire and wheel assemblies.
Remove nut (13), lockwasher (14) and stud (15) from stowage tube (16) on air chamber assembly
Remove cap (17) from bottom hole in air chamber assembly (4).
Insert T of stud (15) into hole in bottom of air chamber (4). Push in and turn clockwise to engage
Install lockwasher (14) and nut (13). Tighten nut against air chamber assembly (4) until brake is
disengaged (wheel turns freely). Do not overtighten.
Repeat procedure for all other wheels and remove jack stand and jack.
Enabling service brakes.
This procedure must be performed when it is necessary to move the ROWPU with a
towing vehicle, equipped with airbrakes and studs are installed in bottom of air chamber.
Using A 10 ton jack and jack stand, raise wheel off the ground high enough to permit rotating the
tire and wheel assemblies.
Remove nut (13) and lockwasher (14) from stud (15).
Turn stud (15) counterclockwise while pushing in to disengage it. Remove stud.
Install stud (15) in stowage tube (16) with lockwasher (14) and nut (13).
Turn wheel to make sure brake is locked and repeat procedure for all other wheels. Remove jack
stand and jack
2-364 Change 1