TM 9-2330-356-14
f. If coupling to an M931A1 or M932A1 towing
vehicle, secure sand shoes in a swing-a-way position
rearward to the semitrailer, using chain "assembly
provided.
If ground boards were used, stow them in their
brackets at each side of semitrailer (fig. 2-2).
Release of Fail-Safe Brakes
NOTE
On M970 and M970A1, brakes will not
release unless hose reel cabinet is closed.
a.
Reserve Air Release. If semitrailer is to be moved by
other than a towing vehicle, push brake release plunger on
roadside of semitrailer to release fail-safe brakes
release twice. When pressure falls under 55 pounds, the
air reservoir must be recharged either by connecting air
lines to tractor or by using a standard air hose and filling
reservoir through filler valve (fig. 2-4). When filling
through filler valve, only front (secondary) reservoir is
filled. Fill to air gage reading of 90-100 psi. A standard tire
gage can be used to check the pressure.
Manual Release (Caging) (M967, M969, and M970
b.
1. Push crank IN for low speed operation.
except M970 SN TC-0843, TC-0844, and TC-103 thru TC-
2. Pull crank OUT for high speed operation.
178) (Fig. 2-5). To manually release the fail-safe brakes when
3. Rotate crank counterclockwise to lower landing gear legs.
no air is available, use the following procedure:
4. Rotate crank clockwise to raise landing gear legs.
(1) Block wheels to prevent semitrailer
TA502281
movement.
Change 3
