(e)
Inspecttheuplockrollerforfreemovementand minimum wobble.

(f)
Inspectbothuplockcableslidingsurfacesforcorrosion,freemovement,and lubrication.

(g)
Checkthegeneralconditionof limitswitchesandwiringforfraying,poorconnections,

or conditionswhichcouldleadto failures.

(h)
Attachtheupperandlowerdrag links andcheck,whenstopsurfacestouch,thatlinkageis

0.063to 0.156inchthroughcenter.Shouldthisdistanceexceedtherequiredthrough-centertraveland bolt andbushingsaretight,replaceoneoralldraglinks.
(i) Inspectshimmydampenerforsecurity,damage,corrosion,andleaks.
8. Cleaningof NoseGear
(a)Cleanall parts witha suitablecleaningsolvent.
9. Repairof NoseGear
NOTE:Theshimmydampenerrequiresnorepairotherthanroutineinspection.Incaseof damageor malfunction, the dampener mustbereplaced,notrepaired.
Repairtothelandinggearislimitedto reconditioning bearingsand
of parts, suchasreplacing

bushings,smoothingout minor nicksandscratches,repaintingof areaswherepainthaschipped
or peeled, andreplacingofparts.
EFFECTIVITY:
040-999
Jan10/90

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

A. Nose Gear and Doors (continued)
10.Disassemblyof Nose Gear Oleo (refer to 32-20-00 Figure 402)
The nose gear oleo assembly is removed from the gear oleo housing with the
and disassembled
gear removed from or installed on the airplane.

(a)
Place the airplane on jacks. (Refer to 7-10-00.)

(b)
Placea drip pan under the nose gear to catch spillage.

(c)
Removeair and fluid from the oleo. (Refer to Oleo Struts, 12-10-00.)

(d)To remove complete cylinder and fork assembly from the oleo housing, cut the safety wire and removecap bolts attaching the steering arm and aligner guide bracket to the top of the oleo cylinder.
(e)
Disconnectthe shimmy dampener by removing thebolt assembly connecting the dampener to the cylinder.

(f)
Releaseand remove theretainer ring at the top of the housing. Pull the complete cylinder assemblyfrom the bottom of the housing. The upper and lower housing bushings mustremain pressed in the housing.

(g)To remove the piston tube assembly from the cylinder, separateupper and lower torque links by removing the connecting bolt with washer, nut, and cotter pin. Note the spacer washer betweenthe two links.
(h)Compressthe piston tube, reach up along the tube and release the snap ring from the annular slot at the bottom of the oleo housing.
(i)
Pull piston tube with componentparts from cylinder.

(j)
The piston tube components are removed by reaching in the tube and pushing out the upper bearing retaining pins. Slide off the tube, the upper bearing,spacer,lower bearing with outer and inner O-rings, wiper strip, washer, and retainer ring.

(k)
Toremovethe orifice tube, remove the large bolt of the orifice tube and lock plate from top of the cylinder. Pull the tube from the cylinder.

(I)
Theorifice place is removed from the bottom of the orifice tube by releasing theretainer ring holdingthe plate in position.

NOTE: Do not remove the piston tube plug or O-ring of the piston tube from the fork.
11.Assemblyof Nose Gear Oleo (refer to 32-20-00 Figure 402)
(a) Ensure parts are clean and inspected.
(b)To assemble orifice tube, insert orifice plate into the bottom of tube with countersunk side of the orifice hole exposed. Secure the plate with the retainer ring. Lubricate and install the O-ring on theupperend of tube.
(c) Insert tube up through bottom of cylinder. With the tube exposed through the top of the cylinder,install orifice tube bolt finger tight.
(d)The piston tube assembly is assembled by installing the tube components on the tube. Slide the retainer ring, washer, lower bearing with outer and inner seals, spacer, and upper bearing onto tube. Align bearing retainer pin holes of the upper bearing and piston tube; install pins.
NOTE: Refer to parts catalog for correct part number when replacing O-rings and wiper strip.
(e) Lubricateinner wall of cylinder and carefully insert the piston tube assembly into the bottom of the cylinder, allowing the orifice tube to guide itself into the piston tube, until the retainer ring can be installed in the annular slot, at the end of the cylinder. Install the wiper strip and slide the washer into position securing the assembly with the retainer ring.
EFFECTIVITY: 040-999

Jan 10/90 32 2000
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

A. Nose Gear andDoors(continued)
1.
Pin,Retainer

2.
Bearing,Upper

3.
Spacer

4.
O-Ring, OuterPacking
　
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