Piper Navajo PA-31 Service Manual page 412

PIPER NAVAJO SERVICE MANUAL
2.
Remove the cotter pins that safety the nuts that secure both upper side brace links to their
attachment plates. On the right gear only, remove the pin at the nut that secures the lower link to the gear
housing. Do not remove the nuts.
3. Place the tool tube through the elongated hole in the tool plate and place the tube over and
between the upper link attachment nuts.
4. Swing the plate up and against the head of the bolt that connects the upper and lower links.
The plate sleeve slides over the nut or the head of the bolt that connects the lower link to the gear housing.
5. Look through the sight hole in the plate to ascertain that the center of the bolt is .063 to
.156 inch below the centerline on the plate.
6. Remove the tool and reinstall the cotter pins.
d. Operate the downlock hook (34) by hand to ascertain that it engages freely and then open the
close the joint several times to assure that the hook is operating properly.
e.
If the hook operates properly, determine proper clearance between the hook (34) and pin (62)
by engaging the hook and pushing up on the side brace link assembly, where the upper and lower links
hinge, until the hook is tight against the pin. This will allow the link stops to separate. Clearance between
stops should not exceed .020 of an inch. If clearance between stops exceed .020 and pin is not worn and
the link through travel is within limits, then hook must be replaced.
f.
If hook will not clear pin, file inside surface of hook until minimum clearance is reached between
the link stops as indicated in Step e. Be careful to maintain the new surface parallel with the original
surface. Replace pin if worn.
CAUTION
Do not file pin.
g.
To replace pin (62), cut the pin, file off any burrs left by the cut and drive the pin out from each
side. Do not try to drill the pin out as this may damage the link. Install new pin and flange over.
h. With the downlock hook engaged. pull the retraction arm (26) located at the top of the forward side
brace toward the downlock hook to the limit of its travel. Also, if installed, pull the downlock operating rod or
cable (23) out to its full length and adjust the end until the hook bolt can be freely inserted through the hook
lugs. Remove bolt, extend end one-half turn. tighten locknut and install attachment bolt and tighten locknut
on rod end.
i. Partially retract and extend gear several times to see that the downlock is operating properly
j. To adjust the uplock hook ( 11). disconnect the uplock operating rod or cable (14) from the hook,
k.
Retract gear. being careful to keep rod or cable clear of moving parts. As uplock roller approaches
hook, operate hook by hand until roller is engaged.
Revised: 3/2/84
LANDING GEAR AND BRAKE SYSTEM
2F10