TM 5-3805-263-14&P-3
f. Seal on piston in one or more of the wheel
TESTING AND ADJUSTING
spindle housings has wear or damage.
g. Service brake(s) have wear or damage.
7. DIFFERENTIAL
LOCK
NOT
ENGAGING
CORRECTLY
4. SERVICE BRAKES NOT RELEASING
Causes:
CORRECTLY.
Causes:
a. Wear or damage to control valve prevents or
a. Adjustment of screw on plunger of control valve
slows the release of pressure oil to the differential lock
does not let the piston in control valve release
valve.
completely.
b. Wear or damage to control valve permits
b. Wear or damage to control valve prevents or
leakage of pressure oil in the LOCK position.
slows the release of pressure air from the signal
c. Wear or damage to the lock valve.
hoses to the relay valves.
d. Wear or damage to the differential lock .
c. Wear or damage to the control valve permits
e. Restriction in oil passage from No. 6 clutch to
leakage of pressure air to one or both of the
differential lock control.
relay valves in the brake OFF position.
d. Wear or damage to one or both relay valves
If the TROUBLESHOOTING gives an indication that
prevents or slows the release of pressure air
pressure oil is not available at the supply port(s) of the
from behind the piston(s) in the service brakes.
control valves, loosen the connection at the supply port
e. Wear or damage to one or both of the relay
and make sure there is oil flow at the connection.
valves permits leakage of pressure air to the
service brakes in the brake OFF position.
If the TROUBLESHOOTING gives an indication of
leakage through a control valve disconnect the delivery
5. CENTERSHIFT LOCK PIN NOT OPERATING
hose at the end opposite the delivery port. Do visual
CORRECTLY
check for oil leak. Replace any leaking oil lines.
Causes:
Check fuse and replace if defective. Check light and
a. No pressure air at supply port of control valve.
replace if defective. Activate steering console switch. If
b. Wear or damage to control valve prevents or
light goes on, touch screwdriver to control lock solenoid.
slows the release of pressure air from one or
If there is no magnetic pull, replace solenoid. If light
both of the hoses to the lock pin.
does not go on, repair wiring or electrical connection at
c. Wear or damage to the control valve permits
solenoid. Recheck solenoid.
little or no pressure air at one or both of the
ports of the lock pin.
d. Wear or damage to control valve permits
TEST PROCEDURES
leakage of pressure air to one or both of the
WARNING: Before any tests of the air
ports of the lock pin.
system
e. Lock pin has wear or damage.
and brakes are done, install the safety
lock pin
6. DIFFERENTIAL
LOCK
NOT
RELEASING
and lower all implements to the ground. Make sure the
CORRECTLY
safety lever is in the PARK position. Put blocks in front
and behind the wheels. Release the pressure air from
the air tank before removing plugs or disconnecting lines.
Causes:
a. No pressure oil at supply port of control valve.
NOTE: Release the pressure from both sections of the
b. Wear or damage to control valve permits oil
air tank.
pressure leakage to oil inlet port of the differential
lock valve.
c. Lock valve has wear or damage.
d. Differential has damage.
e. Defective switch.
f.
Defective fuse.
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