PIPER SENECA II SERVICE MANUAL
04/30/07 VII - LANDING GEAR AND BRAKE SYSTEM
1K17
g. Install the access plate on the underside of the wing and remove the airplane from jacks.
7-24. ADJUSTMENT.
a. Place the airplane on jacks.
b. Level the airplane laterally and longitudinally. (Refer to Leveling, Section II.)
c. 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.
d. Adjust rod end on lower side brace link with no load on wheels,to obtain 89° angle between wheel
centerline and level floor line on outboard side of gear.
e. 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.
f. 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.
g. For easier adjustment of the downlock limit switch, it may be set at this time as explained in
Paragraph 7-34.
h. 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.
i. 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:
NO
TE: If it requires less than .125 of an inch to move the gear into the correct adjustment, Steps 2
and 6 thru 8 need only be followed.
1. Ascertain that the rod end bearing of the actuating cylinder is disconnected from the retraction
fitting.
2. 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.
3. 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.
4. 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.
5. Install with the attachment bolt, bushing, spring swivel, and secure with washer and nut. Install
the gear downlock spring.
6. 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.
7. Check the rod end bearing for adequate thread engagement and tighten jam nut.
8. If the downlock limit switch is properly adjusted, retract and extend the gear hydro-electrically
to ascertain that the gear operates properly.
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