Adjustment Of Nose Landing Gear - Piper Navajo PA-31 Service Manual

i. Grasp the gear fork (48) and rotate to determine that there are no gaps existing between the
steering arm travel bushings (3) and steering bellcrank (6) which could cause the nose wheel to shimmy.
Bushings (3) are available in several different diameters to establish the proper clearance. This adjustment,
as well as the adjustment of the nose gear may be found in Paragraph 7-11.
j.
Lubricate the landing gear assembly. (Refer to Lubrication Chart, Section II.)
k. Check the nose gear for alignment per Paragraph 7-12 and its operation.
7-11. ADJUSTMENT OF NOSE LANDING GEAR. (Refer to Figure 7-2.)
a. With the airplane on jacks and gear extended, disconnect both gear door retraction rods (40) and
secure the doors in the open position.
b. To facilitate adjustment of the uplock, disconnect the lower drag link (41) from the landing gear
oleo housing (44).
c. Disconnect the actuating cylinder rod end (33) from the idler link (24).
d. Ascertain that one end of the downlock spring (22) is disconnected.
e. Rotate the drag link assembly up by hand until the uplock hook (10) engages the uplock bearing
(54).
f. Pull the actuating cylinder barrel (25) down and forward until the actuator attaching bolt is at
the bottom of the slots in the attachment fitting (21).
g. With the uplock rod or cable (18) fully extended and the hook (10) resting on the uplock roller.
adjust the end (13) until the attaching bolt can be freely inserted. Remove bolt, turn rod end out one-half turn
and install bolt and secure.
NOTE
Actuator cylinder attaching bolt must remain in the bottom of the
attachment fitting slots during this adjustment.
h. Attach the lower drag link to the landing gear housing, secure and safety unless checking link
through travel as in step i.
i.
With the gear in the down position and the stop surfaces of the drag links touching, ascertain that
the linkage is 0.063 to 0.156 inch through center.
NOTE
A fabricated tool may be constructed to check through center
travel of the drag link assembly while the links are installed on the
airplane. (Refer to Figure 7-21.)
1.
To use the fabricated tool to check through travel of the drag link assembly, ascertain that
the gear is in the downlocked position with no hydraulic pressure on the system.
2. Remove the cotter pins that safety the nuts that secure both upper drag links to their
attachment plates and the lower link to the gear housing.
3. Place the tool tube through the elongated hole in the tool plate and place the tube over and
between the upper link attachment nuts.
4. Swing the plate up and against the head of the bolt that connects the upper and lower links.
The plate sleeve slides over the nut of the bolt that connects the lower link to the gear housing.
5.- Look through the sight hole in the plate to ascertain that the center of the bolt is .063 to
.156 inch below the center line on the plate.
6. Remove the tool and reinstall the cotter pins.
Revised: 3/2/84 LANDING GEAR AND BRAKE SYSTEM
2E19
PIPER NAVAJO SERVICE MANUAL