Piper COMANCHE PA-24-180 Service Manual page 239

PIPER COMANCHE SERVICE MANUAL
6-58. Checking Landing Gear Retraction Load (Refer to Figures 6-19 and 6-20.) After the landin gear
ha been lubricated and properly adjusted as described in the preceding paragraphs, check retraction load
by using the following procedure:
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. With the gear fully extended, disconnect the retraction transmission assembly by pulling up on the
emergency release lever.
c. Partially retract the gear until it hangs in the neutral position, by using the emergency extension
lever.
d. On airplanes with Serial Nos. 24-1 to 24-4782 inclusive and 24-4784 to 24-4803 inclusive, remove
the red knob on the emergency extension lever and install adapter tool, P/N 26348, on the lever with
attaching bolt forward. (Refer to Figure 6-19.)
e. On airplanes with Serial Nos. 244783 and 24-4804 and up, remove retraction transmission floor
place and install adapter tool, PN 26347, in the left socket of the retraction torque tube. (Refer to Figure
6-20.)
f.
Ascertain that the shoulder of the adapter is seated on the extension handle or on the torque tube
socket.
g. Open the gear motor circuit breaker to prevent motor from running during gear check.
h.
Partially retract landing gear using adapter and install torque wrench on adapter, aligning the
centerline of the torque wrench with the centerline of the retraction torque tube.
i. Turn on the master switch and slowly pull aft on the torque wrench completely retracting the
gear.
j. Observe torque reading when the amber gear up indicator light initially comes on. The torque
reading should not exceed limits given in Table VI-l.
TABLE Vl-I. TORQUE FOR EFFECTIVE WRENCH LENGTH
EFFECTIVE WRENCH LENGTH
MAXIMUM TORQUE
(INCHES)
(FOOT POUNDS)
18
111
16
106
14
100
12
93
10
84
k. If torque exceeds the limits specified, check for the following:
1. Insufficient lubrication. possible binding, improper adjustment and damaged parts of the
retraction system.
2. Check the up limit switch for proper adjustment. It may not actuate soon enough causing the
main gear to be pulled too hard against the rubber stop blocks, exerting excessive load on the system. The
main gear should fit snugly aganst the rubber stop blocks in the wheel well.
LANDING GEAR AND BRAKE SYSTEM
ISSUED: 8/18/72
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