TM-9-2330-356-14
SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1
TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1990
TM-9-2330-356-14 - Page 46 of 528
TM 9-2330-356-14
(5) Install nut on release tool, and tighten until
2
1
/
2
to 2
3
/
4
-inches of release tool is exposed.
Figure 2-5. Manual Release o Fail-Safe Brake (M967,
M969, and M970 exept M970
SN TC-0843, TC-0844, and
TC-103 thru TC-178).
(2)
Unsnap breather cap from each of the four
fail-safe units (fig. 2-5).
(3) Using a
3
/
4
-inch deep socket wrench (Appen-
dix D), turn the manual release bolt counterclockwise un-
tit brake shoes are released on each drum.
CAUTION
Do not leave breather caps off any longer
than necesssary. Water, mud, and other
contaminants can harm the operation of the
brake actuator. The vent on the breather cap
must beat the lowest location pointing down.
(4)
As
soon as air is available to refill the
reservoirs, turn the manual release bolt clockwise on each
of the four fail-safe units until bottomed. Snap breather
caps in place.
c. Manual Release (Caging) (M967A1, M969A1, and
M970A1 including M970 SN TC-0843, TC-0844, and TC-103
thru TC-178) (Fig. 2-6).
To manually release the fail-safe
brakes when no air is available, use the following prodedure:
(1) Block wheels to prevent semitrailer move-
ment.
(2) Remove nut and the release tool from
mounting hole in the fail-safe unit (fig. 2-6).
(3) Remove plug.
(4) Insert the release tool into the hole and turn
1
/
4
-turn to seat release tool in pressure plate.
(6) Repeat steps (2) through (5) for remaining
fail-safe units.
(7) As soon as air is available to refill the
reservoirs, remove the release tool and nut from each of
the four fail-safe units, and install in mounting hole.
Install plugs in place.
Figure 2-6. Manual Release of Fail-Safe Brake (M967A1,
M969A1, and M970A1 including M970 SN TC-0843, TC-
0844, and TC-103 thru TC-178).
2-5.
Operating Towing Vehicle With Semitraller
Coupled
a.
Driving.
The overall length of the towing vehicle
and semitrailer must be kept in mind when passing other
vehicles and when turning. Because the unit is hinged in
the middle, turning and backing are affected. The surge of
the load also affects stopping.
b.
Turning.
When turning corners, remember that
the semitrailer has a shorter turning radius than the tow-
ing vehicle. To make a right turn at a road intersection, the
towing vehicle must continue forward to about the center
of the crossroads, and then turn sharply to the right to al-
low for the shorter turning radius of the semitrailer. lb
back the semitrailer to the right, turn the steering wheel of
the towing vehicle to the left or counterclockwise. The
front of the semitrailer will be pushed to the left, and the
semitrailer wheels will steer to the right.
C.
Stopping. In
normal operation, the brakes of the
towing vehicle and those of the semitrailer are applied at
the same time. Brake pressure should be applied gradually
and smoothly. On steep grades and slippery surfaces, the
semitrailer brakes should be applied first; then the brakes
of the towing vehicle should be applied. This procedure
will reduce the possibility of the semitrailer “jack-knifiig”.
2-4
Change 3
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