TM 9-2330-356-14
4-30. Spring Seat Bearings, M967, M969, M970 except
(5) Look for damaged brake camshaft.
M970 SN TC-0843, TC-0844, and TC-103 thru TC-178.
a. Lubrication Internal. See figures 3-1 through 3-6,
(6) Look for worn brake hoses or damaged broke
Lubrication Chart.
chamber.
Procedure. Remove plug A on bottom of spring
b.
seat (fig. 3-7) and install a -inch NPT grease fitting.
(7) Check tightness of bobs which fasten bogie
Apply enough grease to ensure lubrication of the
assembly to trailer frame.
bearings. Remove grease fitting and install plug.
c.
Replacement of Bearings. If excessive wear is
Repair. Tighten loose bolts. If damage or wear is
c.
evident in the spring seat bearings, notify direct support
evident, notify direct support maintenance.
maintenance.
Section XII. MAINTENANCE OF BRAKE SYSTEM
General, M967, M969, and M970 except M970
chamber is threaded into the wedge bore of the plunger
SN TC-0843, TC-0844, and TC-103 thru TC-178.
housing.
Description. The semitrailer brakes are air-oper-
a.
ated, wedge-type brakes. Two air chambers and two spring
(2) The socket in the end of the diaphragm push
chambers (fail-safe unit) are assembled on each axle. The
rod connects the brake chamber to the wedge rod.
brake chamber forces a wedge between two rollers in the
(3) The wedge retracting spring acts as the return
spring for both the wedge and the diaphragm.
plungers in the actuator assembly to push the brake shoes
against the brake drum.
(4) Rollers on the wedge head engage slots in the
(1) The brakes are double-actuated. One of the
inner ends of the plungers. The outer end of the plungers
are in contact with the brake shoes.
Figure 4-52. Brake Actuator Assembly (M967,
M969, and M970
except M970 SN TC-0843, TC-0844,
and TC-103 thru TC-178).
Change 3