7-25. ALIGNMENT. (Refer to Figure 7-7.)
a. Place a straightedge no less than twelve feet long across the front of both main landing gear wheels.
Butt the straightedge against the tire at the hub level of the landing gear wheels. Jack the airplane
up just high enough to obtain a six and one-half inch dimension between the centerline of the strut
piston and the centerline of the center pivot bolt of the gear torque links. Devise a support to hold
the straightedge in this position.
b. Set a square against the straightedge and check to see if its outstanding leg bears on the front and
rear side of the brake disc. (It may be necessary to remove the brake assembly to have clear access
to the disc.) If it touches both forward and rear flange, the landing gear is correctly aligned.The toe-
in for the main landing gear wheels is 0 ± 1/2 degrees.
NO
TE: A carpenter’s square, because of its especially long legs, is recommended for checking
main landing gear wheel alignment.
c. If the square contacts the rear side of the disc, leaving a gap between it and the front flange, the
wheel is toed-out. If a gap appears at the rear flange, the wheel is toed-in.
d. To rectify the toe-in and toe-out condition, remove the bolt connecting the upper and lower torque
links and remove or add spacer washers to move the wheel in the desired direction. Refer to the
chart on the following page.
e. Should a condition exist that all spacer washers have been removed and it is still necessary to move
the wheel further in or out, then it will be necessary to turn the torque link assembly over. (Refer to
Figure 7-8). This will put the link connecting point on the opposite side allowing the use of spacers
to go in the same direction.
f. Recheck wheel alignment. If the alignment is correct, safety the castellated nut with cotter pin.
g. If a new link on the top left main gear had to be installed or it had to be reversed during the
alignment check, it will be necessary to check the gear safety switch (squat switch) bracket for
engagement and locking in place. If the large machine surface of the link is inboard, the bracket is
mounted with the small rivet hole next to link. (Refer to Sketch A, Figure 7-7.) This hole should be
aligned with centerline of the link and a .096 inch hole drilled .150 inch deep. Insert an
MS20426AD3-3 rivet in the hole. This locking rivet is held in place by the flat washer, castellated
nut and cotter pin. If link has to be reversed, then the bracket and bolt are also reversed. (Refer to
Sketch B, Figure 7-7.)
h. Check adjustment of landing gear safety switch (squat switch) per Paragraph 7-35.
7-25a. REPAIR.
Repair of the landing gear is limited to reconditioning of parts such as replacing components, bearings
and bushings, smoothing out minor nicks and scratches and repainting areas where paint has chipped or
peeled. Existing components should also exhibit limited free play when installed otherwise the bearings
or bushings should be replaced.
PIPER SENECA II SERVICE MANUAL
04/30/07 VII - LANDING GEAR AND BRAKE SYSTEM
1K19
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