Piper Aircraft Corporation Cherokee 140 PA-28-140, Service Manual

Page: 311 / 1024

PIPER CHEROKEE SERVICE MANUAL
01/31/08 VI - HYDRAULIC SYSTEM
2E5
6-20. DISASSEMBLY. (Refer to Figure 6-8.)
a. With the cylinder removed from the airplane, remove the fitting from the piston rod (6) end of the
cylinder (7). Mark the position of the fitting to facilitate reinstallation.
b. On Syncro Devices nose gear actuating cylinders remove the snap ring (1) from the annular slot in
the end of the housing. On Gar-Kenyon nose gear actuating cylinder remove safety wire (9) and
unscrew end gland (2).
c. On Syncro Devices Assemblies pull the piston (6) with end gland (2) from the cylinder housing. On
Gar-Kenyon Assemblies remove piston (6) after unscrewing end gland (2).
6-21. CLEANING, INSPECTION, AND REPAIR.
a. Clean the cylinder parts with a suitable dry type solvent and dry thoroughly.
b. Inspect the cylinder assembly for the following:
1. Interior walls of the cylinder and exterior surfaces of the piston for scratches burrs, corrosion,
etc.
2. Threaded areas for damage.
3. Rod end fitting and swivel fitting of cylinder for wear and corrosion.
c. Repairs to the cylinder and limited to polishing out small scratches, burrs, etc. and replacing parts.
6-22. ASSEMBLY. (Refer to Figure 6-8.)
a. Install O-ring (5) on the exterior of the end gland (2).
b. Install O-ring (4) in the interior of the end gland. The Syncro Devices Assemblies also include a
ring back-up (3) with the O-ring (4).
c. Install O-ring (8) on the body of the piston assembly.
d. Lubricate the areas around the O-rings with hydraulic fluid, slide the end gland on the piston rod
and the piston into the cylinder housing (7).
e. Secure the end gland in the cylinder by installing the snap ring (1) in the annular slot in the Syncro
Devices cylinder. The end gland in the Gar-Kenyon cylinder is secured by threading gland into
cylinder body (7) and securing with safety wire (9).
f. Install restrictor fitting in the piston rod end of the cylinder.
g. Check smoothness of operation of the piston.