Piper Cheyenne IIIA Airplane Maintenance Manual page 580

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Nose Gear and Doors (continued)
3. Installation of Nose Gear (refer to 32-20-00 Figure 401) (continued)
NOTE: Be sure locknuts are tightened against retraction rod.
(i) Grasp gear fork and rotate to ensure no gaps exist between steering arm travel bushings and
steering bellcrank, which could cause the nose wheel to shimmy. Bushings are available in
several different diameters to establish proper clearance. Adjustment must be made with no
load at these points.
(j) Lubricate landing gear assembly. (Refer to 12-20-00 Chart 3 and Figure 302).)
(k) Check nose gear for alignment and operation.
4. Adjustment of Nose Gear (refer to 32-20-00 Figures 401 and 501)
NOTE: Use emergency hand pump in the cockpit or hydraulic test unit to supply hydraulic
pressure for adjustment operations.
(a) With airplane on jacks and gear extended, disconnect door retraction rods and secure doors in
the open position.
(b) To facilitate adjustment of up lock, observe the following:
(1.) Disconnect lower drag link from gear oleo housing.
(2.) Disconnect actuating cylinder rod end from idler link.
(3.) Disconnect end of down lock spring from idler link.
(4.) Disconnect and slip boot over up lock rod and locknut back along rod until adjustment is
complete.
(5.) Pull actuating cylinder barrel down and forward until actuator attaching bolt is at the
bottom of the slots in attachment bracket.
(6.) Rotate drag link assembly by hand until up lock hook engages up lock bearing.
(7.) With both up lock rods fully extended and the hook resting fully on the up lock roller, adjust
the rod ends (up lock and blowdown actuating rod) until the attaching bolt on the hook can
be freely inserted. Remove the bolt, extend the rod ends one full turn and lock. Reinstall
the bolt and secure.
NOTE: The actuating cylinder's and up lock rod's attaching bolt must remain in the
bottom of the attachment fitting slots during this adjustment.
(8.) Lubricate as necessary, slip boot over the up lock rod end locknut and secure after the
adjustment of nose gear is complete.
(c) Return the drag links to the DOWN position, attach the lower drag link to the landing gear
housing; secure and safety unless checking the link through its travel.
(d) The through travel of the link is checked as follows:
(1.) With the gear in the DOWN position and the stop surfaces of the drag links touching,
check the linkage is 0.063 to 0.156 inches through center.
NOTE: The linkage must not exceed 0.156 inches through center. A fabricated tool can
be constructed to check through-center travel of the drag link assembly while the
links are installed on the airplane. (Refer to 32-20-00 Figure 501).)
EFFECTIVITY:
PAGE 8 32-20-00
Jan
10/90
32-20-00