Piper Cherokee Six Service Manual page 230

PIPER CHEROKEE SIX SERVICE MANUAL
b. Connect the manual control push rod (30) to the actuator control arm (19) using
clevis pin (1). Place a washer over end of clevis pin and secure with cotter pin.
c. Move the actuator on its mounting brackets to allow the manual control push rod to
have maximum clearance from the left stabilator cable and center in the fairlead on the aft
face of the main spar box. Check system for sufficient travel and freedom of movement of
controls. Tighten actuator attaching hardware.
NOTE
Care should be used when attaching the forward hose (13) to
the diaphragm assembly (10) so that no strain is placed on
the teflon bushing (15) and diaphragm shaft (16), thus
causing friction in movement.
d. Connect hydraulic tubes (26, 39, 40 and 41) to cross (38) and tee (46).
e. Connect the pressure (13) and static (11) hoses to the elbows (12) of the diaphragm
housing (10). Secure hoses with clamps.
f.
Connect the actuator electrical leads terminal to their mating terminals and insulate.
Refer to the electrical schematic for hookup.
g. Check the actuator adjustments as given in Paragraph 5A-14.
h.
Check to insure that maximum distance between end of link (18) and teflon bushing
(15) does not exceed .65 inch. Override must be engaged for this check. Make any adjustments
at the control cable assembly connector located at the spar box linkage. (Refer to Figures 5A-
6, detail B, and 5A-2, Note 1.)
i. Install floorboard and center seats.
5A-14.
CHECK AND ADJUSTMENT
OF GEAR
BACK-UP EXTENDER
ACTUATOR. (Refer to Figure 5A-6.)
a. If diaphragm failure is suspected note the following:
1. If the landing gear retracts or extends at too high an airspeed or will not retract
at all unless the back-up extender is placed in the override position, then the diaphragm is
possibly defective.
2. If it is determined that the diaphragm is defective, then remove the Back-Up
Extender per instructions given in Paragraph 5A-12 and install, Piper Kit No. 761 138V,
Back-Up Gear Extender Diaphragm Replacement. Instructions for installing the diaphragm
are included in the kit.
3. Following completion of Replacement Kit, reinstall the extender unit in the
aircraft and functionally test and adjust as outlined below and in Paragraph 5A-14a.
b. Adjustment of the gear back-up extender actuator is preset to allow the hydraulic
valve (25) of the actuator to open when the airspeed is reduced below 118 MPH (103 Kts)
with the engine power OFF. This adjustment is accomplished by setting the tension of
spring (24) on the actuator with adjustment screw (2) as follows:
NOTE
The airspeed at which the hydraulic valve of the actuator
opens was preset at the factory under ideal conditions. There
could be some
variations at different
altitudes and
atmosphere conditions.
Revised: 12/15/80 HYDRAULIC SYSTEM
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