7-4.4 SWIVEL LOCKS SYSTEM OPERATIONAL CHECK (Continued)
TM 55-1520-240-T
7-4.4
TASK
RESULT
TASK
RESULT
1. Check that HYDRAULIC BRAKE STEER
circuit breaker (1) iS closed.
2. Check accumulator gage (2).
3. Set SWIVEL switch (3) to LOCK.
4. Set SWIVEL switch (3) to UNLOCK.
5. Manually turn left aft landing gear wheel
(6) clockwise 180 degrees and release it.
6. Set SWIVEL switch (3) to LOCK.
7. Set SWIVEL switch (3) to UNLOCK.
8. Manually turn left aft landing gear wheel
(6) counterclockwise 180 degrees and
release it.
9. Set SWIVEL switch (2) to LOCK.
If BRAKE STEER circuit breaker (1) is open, close
it. If it opens again, go to task 7-4.5.
Gage (2) shall indicate at least 3,000 psi. If It does
not, service accumulator.
Swivel lock actuator rods (4) shall extend between
swivel lock pins (5) on each aft landing gear. If
either landing gear is not locked, go to task 7-4.6.
Both swivel lock actuator rods (4) shall retract and
unlock right and left aft landing gears. If both
gears remain locked, replace STEERING CON-
TROL box. If only one gear remains locked, re-
place swivel lock actuator on that landing gear.
Landing gear wheel (6) shall remain where posi-
t i o n e d.
Left gear wheel (6) shall turn to neutral (trail aft)
position. Both swivel lock actuator rods (4) shall
extend between swivel lock pins (5) on each aft
landing gear. If wheel does not turn or turns but
does not reach neutral position, repair or replace
swivel housing and spindle.
Both swivel lock actuator rods (4) shall retract and
unlock right and left Ianding gear.
Landing gear wheel (6) shall remain where posi-
tioned.
Left gear wheel
6) shall turn to neutral (trail aft)
position, Both swivel lock actuator rods (4) shall
extend between swivel lock pins (5) on each aft
landing gear. If wheel does not turn or turns but
does not reach neutral position, repair or replace
swivel housing and spindle.
10. Repeat steps 4 through 9 for right aft
landing gear wheel (7).
11.
12.
13.
14.
Lift switch guard (8). Set BRAKE STEER
switch (9) to OFF. Cycle SWIVEL switch
(3) three times from LOCK to UNLOCK
to LOCK.
Set BRAKE STEER switch (9) to ON
then back to OFF.
Pump pilots brake pedals three times.
Check accumulator gage (2).
Set BRAKE STEER switch (9) to ON. Close
switch guard (8).
Both swivel lock actuator rods (4) shall retract and
unlock right and left landing gear. If both gear
remain locked, go to task 7-4.7.
NOTE
When swivel lock actuator rods
retract, this indicates that swivel
locks, power steering, and wheel
brakes are isolated from utility
system.
Both swivel lock actuator rods (4) shall extend
between swivel lock pins (5) on each aft landing
gear.
Gage (2) indication shall remain steady. If indica-
tion decreases, replace check valve (10).
FOLLOW-ON MAINTENANCE
T M 5 5 - 1 5 2 0 - 2 4 0 - 2 3:
Battery Disconnected
Electrical Power Off
Hydraulic Power Off
Aft Landing Gear Lowered
and Jacks Removed
END OF TASK
7-145