Table 4-1. Troubleshooting - continued
PROBLEM
POSSIBLE CAUSE
REMEDY
Motor not devel-
4. Motor requiring ex-
Remove motor and check torque re-
oping sufficient
cessive torque.
quirements of driven shaft.
speed or torque -
continued
5. Parts of motor cart-
Remove motor for overhaul.
ridge scored due to
excessive pressure or
foreign matter in oil.
Motor turning in
1. Improper port connec-
Reverse port connections or shift
wrong direction
tions or control.
valve.
2. Components in system
Check complete system for proper
not functioning as in-
operation.
tended.
Motor noisy
1. Air in system.
Bleed air from highest point in sys-
tem and replenish fluid.
2. Motor internally dam-
Remove motor for overhaul.
aged.
3. Noise from other sys-
Check complete system for proper
tem components tele-
operation.
graphing back through
lines and emerging
from motor.
External leakage
Worn seals or cut "O"
Install new seals and "O" rings.
from motor
rings.
Motor shaft con-
Control valve is not
Check control valve for correct spool
tinuing to rotate
functioning properly.
and leakage.
when control is in
"OFF" position
Table 4-2. Air Compressor Troubleshooting
PROBLEM
CHECK & CORRECTION (Refer to figure 4-1)
1. Failure to Engage Compressor
a. Check for truck air system pressure PSI (No. 31). If low, compressor relay is disconnected. After the air
supply pressure is restored, reset Tattletale button on relay No. 34.
b. Check power on the contact NC relay No. 34.
c. Check connection and power to the solenoid valve No. 6.
d. See troubleshooting for air compressor drive clutch (table 4-1).
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