(d)
Thethroughtravelof the link is checked as follows:
(1.) With the gear in the DOWNpositionand the stop surfacesof the drag links touching, checkthe linkage is 0.063 to 0.156 inches throughcenter.
NOTE:Thelinkagemustnot exceed 0.156inchesthroughcenter.Afabricatedtool can be constructed to check through-center whilethe
travel of the drag link assembly linksare installed onthe airplane. (Referto 32-20-00 Figure501).)
EFFECTIVITY:
PAGE 8 32-20-00
Jan10/9032-20-00
A. Nose Gear and Doors (continued)
1.25
MATERIAL: Steel or hard aluminum .875 x .095 x 9.188 Tube .125 x 3.50 x 24.71 Plate
NOTE: It is important that center line accuracy be used when locating holes for installation of bushing, sight slot and elongated hole.
See Note .50 as
.875 R .25
Nose Gear Gauge Link Travel Tool
Figure 501
4. Adjustment of Nose Gear (refer to 32-20-00 Figures 401 and 501) (continued)
(2.) To use the fabricated tool, be sure the gear is in the down locked position with no hydraulic pressure on the system.
(3.) Remove cotter pins which safety the nuts securing both upper drag links to their attachment plates and the lower link to the gear housing.
(4.) Place the tool tube through the elongated hole in the tool plate. Place the tube over and between the upper link attaching nuts.
(5.) Swing the plate up against the head of the bolt connecting the upper and lower links. The plate sleeve slides over the nut of the bolt connecting the lower link to the gear housing.
(6.) Look through the right hole in the plate to ensure the center of the bolt is 0.063 to 0.156 of an inch below the centerline on the plate.
(7.) Remove tool and reinstall cotter pins.
EFFECTIVITY:
040-999
32-20-00Jan10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Nose Gear and Doors(continued)
4. Adjustmentof NoseGear(referto 32-20-00 Figure 501) (continued)
(e)
Theidleror retractionrod mustbe adjustedto provide a distinct snap-throughactionas the idler linkage passesthroughcenter.
(f)
Adjustthe idlerlink stop bolt on the rightsideof the wheelso the idlerlinkageis0.22 to 0.28 inchesthroughcenter. Tightennutson idler links.
(g)
Connectdownlockspringto the idlerlink.
(h)
Extendactuatorpistonwith hydraulicpressureand adjustrodend untilthe attachingboltcan be freely inserted. Releasepressureand extendrodend one fullturn. Reinstallboltand secure. Tighten the rodend locknutand safety wire.
NOTE: Rod ends andstrokecontrolare locked with an NAS559lockingkeyand safetywire. Usethe propertechnique.
(i) Reinstallattachingbolt and secure. Placekey locks betweenlocknutsand the keywayin the
rod. Screw locknuton the rodand keepthe key lock centered in the keywaywhiletighteningthe locknuts (32-20-00 Figure401 showsproperinstallationof the locks on the pistonrod end).
NOTE: It couldbe necessaryto partiallyretractthe gearto tighten the locknuts.
() Retractgearandadjuststrokecontrolstopon the actuator untiltheup lock bearingclearsthe insideoftheuplockhooksurfaceby0.030to0.060ofaninch.Tightenthelocknuton the strokecontrolstop(referto 32-20-00 Figure401).
(k)
Withthegearupandlocked,closeonedoorat a time and adjustdooroperatingrodsuntilbolts canbe freely inserted.Shortenrodsonefullturnoftherod ends. Donotinstallbolts.
(I)
Extendgearandinstalldooroperatingrodbolts.Adjustdooropenstopboltsto allow thedoor linkageto pass 0.06to0.12 inches throughcenter.
(m)Retractgearslowly(use hand pump)andensureallpartsareoperatingsatisfactorily.
(n) Ifgearfailsto remain retractedafterthecockpithandlereturnsto neutral,it is necessaryto readjusteitheror both of the following,untilthegearlocksup:
(1.) Increasetheactuatorstrokebyturningoutthestrokecontrolstop.
(2.) Relieve doorpinchby lengthening thedooroperatingrods.
CAUTION: CHECKALL ROD ENDSFORADEQUATETHREADENGAGEMENT.
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