TM-9-2330-238-14
CHASSIS, SEMITRAILER: 6-TON, 4-WHEEL M295A1; SEMITRAILER, VAN: EXPANSIBLE, 6-TON, 4-WHEEL M313; SEMITRAILER, VAN: SHOP, FOLDING SIDES, 6-TON, 4-WHEEL M447 AND M447C; SEMITRAILER, VAN: REPAIR PARTS, SHOP EQUIPMENT, 6-TON, 4-WHEEL M749; SEMITRAILER, VAN: REPAIR PARTS STORAGE, 6-TON, 4-WHEEL M750
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL
JULY 1992
TM-9-2330-238-14 - Page 96 of 462
TM
9-2330-238-14
Table 3-1.
Operator/Crew
Troubleshooting
(Con’t).
MALFUNCTION
TEST
OR INSPECTION
CORRECTIVE
ACTION
6.
BRAKES
DO NOT
RELEASE.
Step
1.
Step 2.
Step 3.
Step 4.
Step 5.
Check
to see if relay valve
is in applied
position.
If semitrailer
is coupled,
wait until air pressure
on towing
vehicle
reaches
normal
operating
pressure.
If semitrailer
is uncoupled,
open
air reservoir
draincock,
Check
to see if air reservoir
draincock
is open.
Close
air reservoir
draincock.
Check
intervehicular
air lines for loose
connections.
Connect
intetvehicular
air lines properly
(para 2-10).
Check
to see if shut-off
valves
on towing
vehicle
are closed.
Open
shut-off
valves
on towing
vehicle.
Check
intervehicular
air lines for restrictions.
Straighten
or remove
any kinks,
bends,
or restrictions
from
intervehicular
air lines.
7.
BRAKES GRAB.
Check
air system
for moisture.
Open
air reservoir
draincock
and drain
moisture
from
system.
8.
BRAKES ARE SLOW
TO ENGAGE
OR RELEASE.
Check
master cylinder
for proper
level of brake
fluid.
Fill master cylinder
with brake fluid
to proper
level
(Chapter
3, Section
I).
WHEELS AND
TIRES
9.
EXCESSIVELY
WORN,
SCUFFED,
OR CUPPED
TIRES.
Step
1.
Check
tires for proper
inflation.
inflate
tires to proper
pressure (para
1-10).
Step 2.
Inspect
wheels
for looseness.
Tighten
wheel
stud nuts.
Step 3.
Check
tires to ensure that they are properly
matched.
Replace
unmatched
tire with
one that matches.
3-10
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