Table 2-1. Operator Preventive Maintenance Checks and Services (PMCS) for M870A3
Trailer (MHET) Continued.
Not Fully Mission
Any drop in air pressure will
indicate an air leak.
Check for leaks in airbrakes system Any leaks are evident
by shutting off truck tractor engine
when air pressure is at the
maximum. Observe air pressure
gauge for one minute.
If ABS indicator lamp stays on
during mission, continue on with
mission until system can be
properly diagnosed by Unit
Maintenance. Braking capacity
will not be impaired. The only effect
will be no modulation at wheel or
wheels that have a fault.
Trailer is not NMC if during mission
ABS is inoperable and there is no
time to diagnose problem(s)
During blackout mode conditions,
tape over ABS indicator lamp. Do
not remove or otherwise disable
Check that ABS indicator lamp
ABS indicator lamp does
does not stay on.
not come on or ABS
indicator lamp remains
on w/Blink codes.
Check all trailer lights including
brake and tail lights (2), blackout
components or parts.
lights (3), running lights (4), and
clearance lights (1) for proper
operation and cleanliness.
Check for leaks at gooseneck
Any leaks are evident.
Check for leaks in air reservoir tanks. Any leaks are evident.
Momentarily check air tank dump
Inoperative or leaking
valve release cable.