Piper Navajo PA-31 Service Manual page 365

6-133. CLEANING, INSPECTION AND REPAIR OF GEAR ACTUATING CYLINDER. (Same as
Paragraph 6-127.)
6-134. ASSEMBLY OF GEAR ACTUATING CYLINDER. (Refer to Figure 6-30.) Lubricate all parts
with oil per MIL-H-5606 prior to assembly.
a.
Install GT-ring (2) on the head of the piston (3).
b. Install back up (5) and "O" ring (4) into outside groove of end cap (6).
c. Install GT-ring (7) and scraper (8) into inside grooves of end cap (6). Tapered lip of scraper (8) to
face outward.
d. Lubricate the piston assembly (3), the end cap assembly (6) and the bore of the cylinder body
(1).
e. Slide the end cap assembly (6) onto the piston assembly (3).
f. Slide the piston with the end cap into the cylinder, tighten the end cap (6) by torquing to 65
inch-pounds and secure to the cylinder body (1) using safety wire (16).
g. Install the stop (9) and the nut (10) with key (13) on the piston (3).
h. Install the rod end (12) with nut (11) and key (15) into the piston (3).
i. Adjust stop (9) for proper piston stroke, tighten nut (10) by torquing to 65 inch-pounds and
secure by wiring nut (10) to key (13) using safety wire (14).
j. Adjust rod end (12) to preliminary length obtained before disassembly. (Refer to Adjustment of
Landing Gear, Section VII for final adjustments.) Engage key (15) and tighten nut (11) to a torque of 85
inch-pounds.
6-135. INSTALLATION OF GEAR ACTUATING CYLINDER. (Same as Paragraph 6-129.)
6-136. GEAR DOOR ACTUATING CYLINDERS (OZONE).
6-137. REMOVAL OF GEAR DOOR ACTUATING CYLINDERS.
a. With master switch off, actuate the hand pump handle to bring the gear door down.
b. Disconnect the hydraulic lines from the actuating cylinder and cap the open line ends to prevent
contamination.
c. Disconnect the cylinder from the door and its mounting bracket.
d. Remove the cylinder from the wheel well.
6-138. DISASSEMBLY OF GEAR DOOR ACTUATING CYLINDERS. (Refer to Figure 6-31.)
a. Unlock cylinder by applying hydraulic pressure to port in clevis end (22) of actuator.
b. Loosen locknut (2) and remove rod end (1) from piston rod. Remove locknut from piston.
c. Remove safety wire from knurled nuts (13) and loosen knurled nuts.
d. Remove gland end (5) from barrel (17), using a strap wrench on barrel.
e. Remove clevis end (22) from barrel, then push piston (7) from barrel. Use care when pushing
piston from barrel, to prevent the loss of the six balls (12).
f. Remove spacer (6) from barrel.
g. Remove "O" ring (4) and back up ring (3) from gland end (5).
h. Apply a sharp blast of air to hydraulic port of clevis end (22) to remove plunger (18), washer
(11) and race (10). Remove spring (21) from clevis end.
i. Remove "O" rings and back up rings from barrel, piston and plunger.
Revised: 10/12/83
HYDRAULIC SYSTEM
PIPER NAVAJO SERVICE MANUAL
2D11