Removal Of Nose Gear Door Assembly; Cleaning, Inspection And Repair Of Nose Gear Door Assembly; Installation Of Nose Gear Door Assembly; Adjustment Of Nose Gear Door - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
7-12d. SHIMMY DAMPER RIGGING. Ascertain which shimmy damper is installed and use the applicable
rigging procedures which follow:
a. MONROE:
1. Rotate the nose gear to its "FULL RIGHT" tow limit and retain.
2. Extend the shimmy damper piston rod to its full travel and adjust its rod end until the attachment
bolt fits the hole in the bracket.
3. Remove the bolt and turn the rod end bearing "OUT" one full turn and secure jam nut.
4. Reconnect the shimmy damper rod to the bracket.
b. GAR KENYON AND PARKER HANNIFIN:
1. Rotate the nose gear to its full right tow limit and make sure it is retained in that position.
2. Pull the piston rod of the shimmy damper to its full extension.
3. Adjust the push rod end bearing until the attached bolt fits freely through the rod end and bracket.
4. Check that the rod end bearing slides freely between the upper and lower mounting brackets without
distorting either bracket or rod end.
5. If deflection occurs, adjust the bracket by using an adjustable wrench. With suitable protection to
the brackets surface, bend the brackets at the 90
°
bend, along with rotating the top bracket to obtain proper
alignment.
6. Remove the bolt and turn the rod end bearing out one full turn and secure jam nut.
7. Bolt the rod end bearing to the bracket.
7-13. REMOVAL OF NOSE GEAR DOOR ASSEMBLY.
a. To remove the gear door, disconnect the retraction rod at the door and remove the hinge bolts at each
side of the wheel well.
b. To remove the door retraction mechanism, ascertain that the retraction rod is disconnected, disconnect
the downlock spring and remove the snap ring that holds the retraction mechanism on its support shaft. Pull the
retraction mechanism from the shaft.
7-14. CLEANING, INSPECTION AND REPAIR OF NOSE GEAR DOOR ASSEMBLY.
a. Clean all parts with a suitable cleaning solvent.
b. Inspect the door for cracks or bent skin, loose hinge brackets and worn or corroded bearings.
c. Check the retraction mechanism for worn downlock spring and worn or damaged surfaces.
d. Repair to the door assembly is limited to replacing hinge bearings or rivets and mechanism parts,
minor skin repairs and repainting.
7-15. INSTALLATION OF NOSE GEAR DOOR ASSEMBLY.
a. To install the door retraction mechanism, position and bolt the unit in place and connect the downlock
spring.
b. The gear door is installed by aligning the bracket bolt hole with the hinge, installing bolt assembly and
securing. Attach and secure retraction rod.
7-16. ADJUSTMENT OF NOSE GEAR DOOR.
a. Ascertain that the nose landing gear has been properly adjusted.
b. With gear up and locked, close one door at a time and adjust door operating rods until bolts can be
freely inserted. Shorten rods one full turn of rod end bearings. Do not install bolts.
c. Extend gear and install door operating rod bolts. Adjust "door open" stop bolts to allow door linkage to
pass .06 to .12 inches through center.
d. Retract gear slowly and observe that all parts are operating satisfactorily.
e. If gear fails to remain retracted after cockpit handle returns to neutral, it will be necessary to readjust
either or both of the following items until gear will lock up.
1. Increase actuator stroke by turning out stroke control stop.
2. Relieve door "pinch" by lengthening door operating rods.
Revised: 2/18/94
LANDING GEAR AND BRAKE SYSTEM
2E24