(b)
Loosenlocknut and remove rod end. Remove locknutfrom piston.
(c)
Removesafety wire and loosen both knurled nuts.
(d)
Removeend cap from barrel.
(e)
Removeclevis end from barrel. Pull piston with end cap from barrel, being careful not to lose any of the six balls nested in the head end of the piston.
(f)
Removeend cap from piston.
(g)
Pull race, plunger, and spring out of the clevis end.
(h)
RemoveGT-ringfrom end cap.
(i)
RemoveO-rings and back up rings from barrel.
(j)
RemoveGT-ringfrom piston.
(k)
RemoveO-ringand back up ring from plunger.
EFFECTIVITY:
32-30-00Jan
32-30-00 10/90
Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Extension and Retraction (continued)
Rod End Locknut-End Cap
Piston
GT-Ring
Back Up
Barrel
Back Up Race Plunger-Back Up
Clevis End
Gear Door Actuating Cylinder
Figure 403
GT-Ring SafetyWire
O-Ring
Nut
Nut
O-Ring
Ball
)-Ring
Spring
SafetyWire
EFFECTIVITY:
Jan10/9032-30-00
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Extensionand Retraction(continued)
22. Assemblyof Gear DoorActuatingCylinders (referto 32-30-00 Figure403)
Lubricateall partswith oil (MIL-H-5606)priorto assembly.
(a)
InstallO-ring andbackup ringintoplungergroove.
(b)
Installnutson barrel.
(c)
Installback up ringsandO-ringsintogroovesof barrel.
(d)
Installspring,plunger,andrace intoclevis end. Secureby screwingbarrelintoclevisend. Torquebarrel downagainstthe raceto 120-140 inch-poundsand nut againstclevisend to 120-140 inch-pounds.
(e)
InstallGT-ringintogrooveof piston.
(f)
InstallGT-ringintogrooveinsideendcap.
(g)
Slidepistonintoendcap. Installsix balls intoholesin pistonheadand insertassemblyinto boreof barrel. Screwendcaponto barreland alignport in end capwith portin clevisend. Tightennut againstendcap andtorqueto 120-140 inch-pounds.
(h)
Securenutto endcapusingsafetywire.
(i)
Securenutto clevisendusingsafetywire.
(j)
Installlocknutand rodendon piston.
(k)
Adjustrod endfor properlengthof actuatorassemblyandlockwith locknut.
23. Installationof GearDoorActuatingCylinders
(a)
Positioncylinderon its mountingbracket. Securewith attachmentbolts.
(b)
Extendcylindercontrolrodenoughto attachrod endto door. Securewith attachmentbolt.
(c)
Connecthydrauliclineto cylinder.
(d)
Tobringgear doorbackto theclosedposition,set masterswitchON. Placegearleverin the DOWNpositionand actuatethe handpumpuntilthe doorcloses.
24. Inspectionof GearDoorActuatingCylinders
(a)
Inspectall threadedsurfacesfor cleanliness,cracks,andexcessivewear.
(b)
Inspectplungerspringforbreaksanddistortion.Compressspringto a lengthof 0.750inches and measureload. Loadshouldbe 30± 2 pounds.
(c)
Inspectend cap,piston,barrel,race,plunger,andclevisendfor cracks,chips,scratches, scoring,wear,and surfaceirregularitieswhichcouldaffectfunctionof dooractuatorcylinder.
25. Cleaningof Gear DoorActuatingCylinders
(a) Cleancylinderpartswith a suitablesolvent;dry thoroughly.
26. Repairof Gear DoorActuatingCylinders
(a)
Replaceall defectivelandinggearactuatorassemblypartswith newparts.
(b)
Minorscratchesand scorescanbe removedby polishingwith fineabrasivecrocuscloth (FederalSpecificationP-C-458)providingtheir removaldoesnot affectoperationof actuator assembly.
(c)
Replaceall O-rings,backup rings,andGT-ringswith newonesduring reassemblyof actuator.
EFFECTIVITY:
32-30-00Jan
Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Wheel Assemblies NOTE: Refer to vendor publications list for B. F. Goodrich manual.
1. Fault Isolation -Wheel Assemblies
NOTE: Place airplane on jacks before attempting fault isolation of landing gear system (refer to 7-10-00).
CHART 1 FAULT ISOLATION (WHEEL ASSEMBLIES)
Fault Cause Remedy
Nose gear shimmies Tire out of balance. Check balance and replace
during fast taxi, takeoff tire if necessary.
and landing.
Worn or loose wheel Replaceand / or adjust wheel
bearings. bearings.
Main landing gear Tire out of balance. Check balance and replace tire
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