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

PIPER NAVAJO SERVICE MANUAL
j. Adjust the retraction rod (36) to provide a distinct snap-through action as the idler linkage passes
through center.
k. Adjust the idler link stop bolt (30) on the right side of the wheel well so that the link is .220 to
.280 of an inch through center. A straightedge laid from the attachment bolt heads of the idler link and
retraction rod will give the through travel measurement.
1.
Connect the down lock spring (22).
m. Extend the actuator cylinder with hydraulic pressure from the hand pump and adjust the rod end
(33) until the attachment bolt can be freely inserted. Release pressure and extend the rod end one full turn.
NOTE
Actuator cylinder attachment bolt must remain at the top of the
attachment fitting slot during adjustment.
n. Reinstall attachment bolt and secure. Tighten rod end lock nut. Figure 7-8 shows the piston rod
end with installation of lock nut and lock.
NOTE
It may be necessary to partially retract gear to tighten lock nut.
o. Retract gear and adjust stroke control stop (52) actuator until the uplock bearing (54) clears the
inside of the uplock hook (10) surface by .030 to .060 of an inch. Tighten locknut on stroke control stop.
(Refer to Figure 7-8.)
p. Connect landing gear doors and ascertain doors are properly adjusted.
CAUTION
Ascertain that all rod ends have sufficient thread engagement by
inserting a wire in the check hole of the rod.
7-12. ALIGNMENT OF NOSE LANDING GEAR.
a. With no load on the nose wheel, make sure no gap exists at the points where the steering arm
bushings contact the steering bellcrank, but will allow the bushings to rotate with a slight drag. Install
bushings (.625 dia., P/N 14976-23; .687 dia., P/N 14976-21; .812 dia., P/N 14976-102; .750 dia., P/N
14976-13; 1.00 dia., 14175-113) to obtain proper adjustment.
b. Two methods of aligning the nose landing gear are as follows:
CHALK METHOD:
1. Place the airplane on a smooth level floor that will accommodate the striking of a chalk line.
2. Place the airplane on jacks. (Refer to Jacking, Section II.)
3.
Level the airplane laterally and longitudinally. (Refer to Leveling, Section II.)
4. From the center of the tail skid, extend a plumb bob and mark the contact point on the
floor.
5.
Extend and attach a plumb from a point that is approximately 24 inches forward along the
bottom-center row of rivets as measured from the wheel well opening. Mark the point of contact on the
floor.
6. Using the two plumb bob marks as a guide, snap a chalk line, extending several feet beyond
each mark.
7.
Clamp rudder pedals to align in a lateral position. (Refer to Figure 7-3.)
Reissued: 10/12/79
LANDING GEAR AND BRAKE SYSTEM
2E20