PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
VA - HYDRAULIC SYSTEM
07/15/06
1K6
5A-28. REMOVAL AND INSTALLATION OF HYDRAULIC LINES. Remove a damaged hydraulic line by
disconnecting the fitting at each end and by disconnecting where secured by brackets. Refer to Figure
5A-2 as an aid in the location of attaching brackets and bends in the lines. Provide a small container for
draining the line. Install a new or repaired line in reverse. Operate the pump to purge the system of air
and check fluid level in reservoir.
5A-29. TESTING HYDRAULIC SYSTEM. The hydraulic system should be tested to determine that it
functions properly after performing any service or repairs. It is suggested that the airplane be connected
to an outside power source in order to conserve the battery. (Refer to External Power Receptacle, Section
II.)
CAUTION: TURN MASTER SWITCH OFF BEFORE INSERTING OR REMOVING EXTERNAL
POWER SUPPLY PLUG.
a.
Place airplane on jacks. (Refer to Jacking, Section II.)
b. With gear down, master switch ON, and circuit breaker closed, place landing gear selector switch in
the UP position. The pump should immediately start operating and the gear retract. The red gear
unsafe light on the instrument panel should light up until the gear is fully retracted. The hydraulic
pump should stop operating after full gear retraction.
c.
Place gear selector switch in DOWN position. The gear should extend and lock in position. Gear
down lights on the instrument panel will light up when all three gears are locked in position. Inspect
hydraulic system for leakage of hydraulic fluid.
d.
Recycle the landing gear to determine that it functions properly.
CAUTION: PRIOR TO REMOVING THE AIRPLANE FROM JACKS, TURN MASTER
SWITCH ON AND DETERMINE THAT ALL THREE GREEN LIGHTS ARE
ENERGIZED. THIS WILL INDICATE THE LANDING GEAR IS DOWN AND
LOCKED.
e.
To check operation of gear back-up extender actuator, refer to Paragraph 5A-14 for Check and
Adjustment Procedures.
5A-30. SERVICING HYDRAULIC PUMP/RESERVOIR. The fluid level of the reservoir of the combination
pump and reservoir should be checked every 50 hours by viewing the fluid through the filler plug hole in
the hydraulic pump. Access to the pump is through the panel at the left side of forward baggage
compartment.
To check fluid level, remove the filler plug located on the forward side of the pump and ascertain that
fluid is visible up to the bottom of the filler plug hole. Should fluid be below the hole, loosen the vent
screw and add fluid, MIL-H-5606A, through the filler hole until full. Reinstall the filler plug and tighten
the vent screw.
Summary of Contents for Cherokee LANCE
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