Piper Cherokee Six Service Manual page 345

PIPER CHEROKEE SIX SERVICE MANUAL
6A-31. ADJUSTMENT OF NOSE GEAR UP LIMIT SWITCH. The gear up limit switch is
mounted on a bracket above the point where the right side of the upper drag link attaches
to the engine mount. (Refer to Figure 6A-10.)
a. To facilitate adjustment of the limit switch, disconnect the gear doors or remove the
bottom cowl, as desired.
b. Retract the landing gear hydro-electrically by turning the master switch on, raising
the emergency gear extension lever and moving the gear selector handle to the up position.
Retain the emergency extension lever in the up position and turn the master switch off.
c. Block the nose gear in the up position and then slowly release the emergency
extension lever. This will relieve hydraulic pressure and the main gears will drop.
d. Place a .027 of an inch spacer on the oleo strut housing between the housing and the
crossover tube where the steering arm attaches. Push the gear up tight and block.
e. Loosen the lower attachment screw of the switch bracket and rotate the switch
toward the actuator tang until it is heard to actuate. Retighten the bracket attachment
screw of the switch.
f.
Manually move the gear up and down only as far as necessary to ascertain that the
switch actuates at the correct position. Remove the block from under the gear and allow it
to slowly extend.
g. Retract the gear hydro-electrically and ascertain that the red gear unsafe light will go
out when the gear has retracted and the pump has shut off.
6A-32. ADJUSTMENT OF NOSE GEAR DOWN LIMIT SWITCH. The gear down limit
switch is mounted on the horizontal support tube of the engine mount that runs between
the right attachment points of the gear housing and upper drag link.
a. Ascertain that the gear is down and locked.
b. The down limit switch should actuate only after the leading edge of the downlock
hook, when moving to the locked position, has passed the downlock roller by .06 of an
inch. (Refer to Figure 6A-10.) Position the hook at this location in relation to the roller by
moving the actuator piston manually toward the up position. The downlock spring may be
disconnected, if desired.
c. Loosen lower attachment screw of the switch mounting bracket and move bracket
toward the downlock hook until it is heard to actuate. Retighten the bracket attachment
scre w.
d. Manually move the hook from the locked to the unlocked position and ascertain
that the switch actuates at the correct location of the hook.
e. Retract and extend the gear hydroelectrically
by turning the master switch on.
raising the emergency gear extension lever and moving the gear selector handle to the up
position. As the gear begins to retract the green light below the selector should go out and
the red gear unsafe light at the top of the instrument panel should come on.
6A-33. ADJUSTMENT OF MAIN GEAR UP LIMIT SWITCH. A gear up limit switch is
located in each wheel well above the gear door hinge. There is no adjustment of these switches
other than checking that the gear. when retracting. will actuate the switch within .88 of an
inch of full up. Switch operation turns the red gear unsafe light out.
LANDING GEAR AND BRAKE SYSTEM
Issued: 7/28/75
2D21