TM 9-2330-294-14
(6) Using driver (CPR 102256) seat seal
assembly into the plunger housing same as (2) (c )
above. Hand tighten guide assembly into the
plunger housing.
(7) Proper meshing of the pawl and actuator
teeth can be checked at this point. Grease-coat
(BRH) adjusting bolt threads and thread adjusting
bolt into the adjusting actuator after working it
through the seal assembly flap hole, being careful
not to pinch the seal in the threads. Thread ad-
justing bolt into the actuator until it bottoms. A
clicking sound and a ratcheting feel will indicate
meshing of the teeth. Turn the adjusting bolt out
three turns. Proper meshing is indicated if there is no
clicking sound or ratcheting feel.
(8) Tighten guide assembly to 15-20 lb ft
(9) Turn adjusting bolt in to just short of the
seal assembly. Do not bottom it on the seal. Pull the
adjusting bolt and actuator outward slightly against
the seal, to insure entry of the seal lip in the actuator
groove. Push the bolt and sleeve back into the
plunger.
f. Installation. Install new or repaired plunger
housing assembly in reverse order of removal
(b above). Take care to install right-hand and left.
hand assemblies on proper side of semitrailer.
Section VIII. AIR SYSTEM MAINTENANCE
towing vehicle air system is operating
4-36 General
properly.
The air system includes lines, fittings, valves,
(1) Air pressure check. Prior to making the
controls, and reservoir necessary to operate the air
following checks and tests be sure good connections
brake and air suspension systems. Refer to
are made at the air supply couplings from the towing
vehicle. Allow approximately 10 minutes for the
system. Refer to paragraph 4-52 for a description of
trailer air system to become fullycharged. Install
the air suspension air system.
accurate tire gage (recently calibrated) on tank valve
of auxiliary air supply valve (fig. 2-8). Assure that
Conjunction with Troubleshooting
system air pressure is at 90.120 psi. (Same reading
a. General. The following procedures briefly
should be obtained at tank valve at air tank fill (fig.
outline steps necessary to isolate malfunctions. This
2-3) ). If air pressure is low, check emergency and
paragraph also includes individual air system
reservoir air line tubing for kinks and listen for
component tests necessary for troubleshooting. All
leakage (d below). Refer to figure 4-27 and 4-28 to
tests for valves are on-vehicle, in-system tests.
identify air lines.
Valves shold not be removed unless they are to be
(2) Test while driving. Tow vehicle short
replaced.
distance while observers are stationed along roadside
b. Brake Air System Checks.
at sides of trailer, Perform test first with front
NOTE
suspension raised, then with rear suspension raised.
No testa should be made on the semitrailer
If brakes fail (no wheel skid observed), or if brakes
air system until you make sure that the
pull, grab, are weak, uneven, slow in application, or
