TM-9-2330-335-14-P

SEMITRAILER, TACTICAL, BREAKBULK/CONTAINER TRANSPORTER, 22-1/2 TON, RESET M871R, M871A1R AND M871A2R

TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE MANUAL (INCLUDES REPAIR PARTS AND SPECIAL TOOLS LIST)

SEPTEMBER 2008
TM-9-2330-335-14-P

  TM-9-2330-335-14-P - Page 94 of 640

TM 9-2330-335-14&P
0012-6
0012
BRAKES - CONTINUED
5.
SLOW BRAKE APPLICATION OR RELEASE.
Step 1.
Check air pressure gage on towing vehicle for a minimum of 90 psi (621 kPa).
a.
If air pressure is low, build up pressure to normal level.
b.
If air pressure is low and will not build up, troubleshoot towing vehicle air system.
(See maintenance manual for towing vehicle.)
c.
If air pressure gage indicates normal, go to step 2.
Step 2.
Check air lines and connectors for restrictions and leaks.
a.
Remove any restrictions from hoses and tighten connections. Repair or replace as necessary
(WP 0037).
b.
If air lines and connections are not restricted or leaking, go to step 3.
Step 3.
Check control valves for plugged exhaust ports, (WP 0040).
a.
If exhaust port is plugged, clean valve.
b.
If exhaust port is not plugged, go to step 4.
Step 4.
Test operation of control valves (WP 0040).
a.
If control valve is defective, replace (WP 0040).
b.
If control valves are operating, go to step 5.
WARNING
To prevent injury, keep hands away from brake chamber push rods and slack adjusters. They will
move as service brakes are operated, and will automatically apply if system pressure drops.
Fingers/hands could be pinched or cut by moving parts. Failure to comply may result in injury to
personnel.
Step 5.
Have a helper apply and hold the towing vehicle service brakes. Using soapy water, check air brake
chambers for leaks at clamp bands and hose fittings.
a.
If leaks are seen at brake chamber clamp band, replace spring brake chamber (WP 0038).
b.
If leaks are seen at hose fitting, tighten hose fitting or replace hose (WP 0037).
c.
If brake chambers are not leaking, go to step 6.
Step 6.
Remove brake drum (WP 0033) and check for broken brake shoe tension spring.
a.
If spring is broken, replace (WP 0032).
b.
If spring is not defective, go to step 7.
Step 7.
Visually check for broken or frozen camshaft roller.
If camshaft roller is broken or frozen, replace (WP 0032).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
0.


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