PIPER CHEROKEE SERVICE MANUAL
II - HANDLING AND SERVICING
01/31/08
1D16
2-30. SERVICING.
2-31. INTRODUCTION TO SERVICING. This includes replenishment of fuel, oil, and hydraulic fluids; the
maintenance of tire pressures; and the lubrication of various items.
2-32. HYDRAULIC SYSTEM (PA-28R)
2-33. SERVICING HYDRAULIC SYSTEM. The general condition of the hydraulic pump and landing gear
actuating cylinders should be checked. Ensure that there are no leaks and that the line fittings are tight.
The cylinder rods are to be free of all dirt and grit. To clean the rods use an oil soaked rag and carefully
wipe them. All the hydraulic lines should also be checked for freedom of leaks, kinks, and corrosion.
Check for tightness of the attachment fittings.
The gear back up extender actuator assembly is located beneath the rear seat and should be checked to
determine that it is operating properly. The diaphragm shaft may be operated by hand to make sure that it
is free to fluctuate and that the actuating arm and its components are operating freely. Check the pressure
housing assembly for absence of cracks, breaks, or fatigue. Check to ensure that the hydraulic valve and
fittings are free of leaks.
Repair and check procedures for the hydraulic pump, cylinders and various components may be found in
Section VI of this manual.
2-34. 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 right rear side of the baggage
compartment.
To check fluid level, remove the 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, add fluid, MIL-PRF-
5606, through the filler hole until full. Reinstall the filler plug and tighten.
NOTE: A small vent hole is located under the vent screw head. Retain 1/64 inch clearance between the
screw head and the small vent hole.
2-35. LANDING GEAR SYSTEM.
2-36. SERVICING LANDING GEAR. The landing gear consists of tires, brakes, oleo strut assemblies and on
some models, wheel fairings. The gear should be inspected for proper extension, unscored piston tubes,
soundness of hydraulic fluid seals, the security and firm mechanical condition of all connection points
and the absence of cracks in the fiberglass fairings. Check the brake linings for excessive wear, the brake
discs for scoring and replace as necessary. The PA-28R should be checked for proper adjustment of
down locks, the mechanical soundness and firm action of drag and side brace links. Minor servicing is
described in the following paragraphs. Detailed service and overhaul instructions are given in Sections
VII or VIIA.
Summary of Contents for Cherokee 140 PA-28-140
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