Rockwell Commander 112 - Page 70

ROCKWELL
COMMANDER
112/B/TC/TCA
TROUBLE
Gear retraction/
extension system
fails to operate.
Slow gear retraction.
Change 2
MAINTENANCE MANUAL
PROBABLE CAUSE
Emergency extension valve in down
position.
Landing gear ACT circuit breaker
open.
Landing gear SEL circuit breaker open.
Landing
gear ACT circuit wires broken.
Landing gear SEL circuit wires broken.
Ground contact switch out of adjustment
or inoperative.
Battery low or dead.
Gear selector switch ground incomplete.
Gear selector switch inoperative.
Hydraulic power pack pump retraction
relay inoperative.
Hydraulic power pack pump ground
incomplete.
Hydraulic power pack pump inoperative.
Hydraulic fluid in power pack reservoir
below operating level ..
Restriction in hydraulic lines.
Gear up pressure switch defective.
Gear down pressure switch defective.
Hydraulic fluid in reservoir below
operating level.
Low battery.
Restriction in hydraulic lines.
REMEDY
SECTION III
HYDRAULICS
Check visually. Reset valve.
Check visually. Reset circuit
breaker.
Check visually. Reset circuit
breaker.
Check wiring. Replace defective
wiring. To check switches and
wiring refer to Section X.
Check wiring. Replace defective
wiring. To check switches and
wiring refer to Section X.
Check switch. Adjust or replace
switch (see Section VI). If circuit
breakers continue to open, locate
and repair short circuit within
system. To check wiring refer to
Section X.
Check specific gravity. Replace
defective battery.
Check visually. Complete ground.
Check switch. Replace defective
switch.
Check relay. Replace defective
relay.
Check visually. Complete ground.
Check pump. Replace defective
power pack unit.
Check fluid. Fill reservoir with
MIL-H-5606 hydraulic fluid.
Isolate and check hydraulic lines.
Clean hydraulic lines.
Check switch. Replace defective
switch.
Check switch. Replace defective
switch.
Check fluid. Fill reservoir with
MIL-H- 5606 hydraulic fluid.
Check specific gravity. Replace
defective battery.
Isolate and check hydraulic lines.
Clean hydraulic lines.
Figure 3-8. Trouble Shooting Hydraulic System (Sheet 1 of 2)
3-13
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