Main Landing Gear Adjustment - Piper PA-44-180 SEMINOLE Maintenance Manual

ADJUSTMENT OF MAIN LANDING GEAR.
1. Place the airplane on jacks.
2. Level the airplane laterally and longitudinally. (Refer to Chapter 8.)
3. Disconnect the gear door actuating rods at either the door or the housing, as desired, by removing the rod
attachment bolt. Secure the door out of the way.
4. Adjust rod end on upper side brace link with no load on wheels to obtain 90 degree angle between wheel
centerline and level floor line on outboard side of gear.
5. Check that the rod end has sufficient thread engagement in the end bearing. align the flat sides of the
bearing casting with the flat side of the bearing and tighten the jam nut.
6. Adjust the turnbuckle of the downlock mechanism by first ascertaining that the gear is down and locked,
and then move the retraction fitting outboard until it contacts the stop slot of the side brace link. Hold the
fitting in this position and turn the turnbuckle barrel until the downlock hooks make contact with the lock
pin. Safety the turnbuckle.
7. For easier adjustment of the downlock limit switch, it may be set at this time.
8. Retract and extend the gear manually several times to ascertain that the side brace link falls through center:
the downlock hook falls into position and there is no binding of the gear assembly.
9. The gear should be adjusted in the up position to allow the gear fork to press lightly into the rubber bumper
pad on the wing. The adjustment may be accomplished as follows:
If it requires less than .025 of an inch to move the gear into the correct adjustment,
Steps B and F thru H need only be followed.
A. Ascertain that the rod end bearing of the actuating cylinder is disconnected from the retraction fitting.
B. Actuate the hydraulic system to bring the hydraulic cylinder to the up position by turning the master
switch on and moving the gear selector handle to the up position. The piston of the cylinder should be
bottomed.
C. Raise the gear by pushing up on the retraction fitting, thus disengaging the hooks, and pushing up on
the pivot point at the bottom of the side brace links to bring the links out of the locked position. Raise
the gear until the fork presses lightly into the rubber pad. Retain the gear in this position.
D. Loosen the jam nut on the piston rod of the actuating cylinder and turn the rod end bearing in or out to
allow a slip fit of the attachment bolt.
E. Install with the attachment bolt, bushing, spring swivel, and secure with washer and nut. Install the
gear downlock spring.
When adjusting rod end be sure to allow at least a .03 inch cushion prior to bottoming
with the downlock in the up position.
F. When the gear is to within .125 of an inch of correct adjustment, the rod end need not be disconnected
and therefore all that will be required is to loosen the jam nut. place a wrench on the flat at the end of
the piston rod and turn to obtain correct adjustment.
G. Check the rod end bearing for adequate thread engagement and tighten jam nut.
H. If the downlock limit switch is properly adjusted, retract and extend the gear hydro-electrically to
ascertain that the gear operates properly.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— Note —
— Note —
2G10
3 2 - 1 2 - 0 4
Page 32-18
Revised: May 15, 1989