greaseand80%MobilJetII Oil lubricant,orequivalentto O-rings.
(e)
Insertwormshaftintohousing.
(f)
Insertbothballbearingsintohousing,makingsurebearingsareseated.
(g)Attachoneoutputflangeandsecurewithfourscrews.Onoppositesideattachoutputflange
withtwoscrews.Usinga dialindicator,checkendplayofwormshaftandaddshimasrequired toobtain0.004to 0.010inchendplay.Securewithfourscrews.
(h)
Inserttool7801-T3ontosplineofwormshaftandcheckthatshafttorquedoesnotexceed12 inches.
(i)
Insertfrontbearingassemblyintofronthousingassembly.
NOTE:Shoulderofbearingis to bepressedintobumperwasher.
EFFECTIVITY:
PAGE
040-999 27-50-00 7
27-50-00 Jan 10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Flaps(continued)
11.Assemblyof FlapTransmission(continued)
(j) Takemeasurementfrommilledsurfaceofhousingto innerraceYdimension.SubtractZ
dimensiontakeninfirstmeasurement (referto Figure501).
fromYdimension
(k) Measurewidthofwormgearface.TakehalethethicknessandsubtractthisfromA dimension
obtainedin secondmeasurement.Subtract0.001/0.002inchfromresults.Thisistheshim
thicknessrequired(referto Figure501).
(l) Placeshimovertopoffrontbearing.Placewormgearovershim,shoulderendup.
(m)Takemeasurement to shoulder
frommilledsurfaceof housing ofwormgearW dimension (referto Figure501). MeasurewidthofrearbearingKdimension.Subtractthetwomeasurements.
Subtract0.001/0.002fromresults.Thisistheshimrequired.
NOTE:Donotinstalltheshimatthistime.
(n)Applyapproximately1/8oz.of lubricationconsistingof 20% AeroshellNo.7greaseand80%
MobilJetIIOil,orequivalentmixture,to worm shaftandwormgear. Rotatewormshaftwhile
applying.
(o) Installball screwandtube assemblythroughbearingandwormgearin front housingand line up keyways.
NOTE: Keepwormgearandwormshaftinmeshwhileinserting.
(p)
Insertkey in keyway.
(q)
Placeshim,previouslydeterminedontop of wormgear.
(r)
Placerearbearing,flangesideup, in housing.
(s)
Place lockwasher over ballscrew. Threadlocknut(chamferedsidedown)ontoscrew.
CAUTION: MAKESUREBALLNUTANDTUBEASSEMBLYIS POSITIONEDAWAYFROM HOUSINGBEFORETIGHTENINGLOCKNUT.
(t) Tightenlocknutto a torque of80 in. lbs.minimumtoalignlockwashertangwithslotin nut.
Bendtangintoslot.
CAUTION: MAKESURETHATNOCHIPSARE FORMEDDURINGTIGHTENINGOF NUT.
(u)
Aftertighteningnut,measuredistancefrommilledsurfaceofhousingtoouterraceofrearbearing.Readingshouldbebetween0.001/0.004inch.
(v)
PlaceO-ringintoO-ringgrooveinhousing.Installrearhousingandattachwithbolts.Tightenboltstoatorqueof35-40in. lbs.
EFFECTIVITY:
PAGE8 27-50-00
040-999
Jan10/9027-50-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Flaps (continued)
Pin 0.328"O.D.
PinDia. divide by 2 = 0.164" (0.328"ref) X +0.164" (Z)Firstreading First Measurement NOTE:Shouldread0.750"(ref)
(A) Second reading
Bearing Front Bearing
SecondMeasurement
Third Measurement
FlapTransmissionMeasurements
Figure501 (Sheet1 of 2)
EFFECTIVITY: 040-999 27-50-00 Jan 10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Flaps(continued)
FrontBearing
RearBearing
Measurerearbearing
"K"width,subtractfrom
dimension"W"
Subtract0.001/0.002" W for shim requirement -K ANS
WormGear
Fourth Measurement
Flap Transmission Measurements Figure501(Sheet2of2)
EFFECTIVITY:
040-999
Jan10/90
275000
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Flaps (continued)
12. Serviceand Inspectionof FlapTransmissionInternalComponents(CALCO)
CAUTION: ALL DEFECTIVEOR WORNPARTSMUSTBE REPLACEDWITHNEWPARTS. DONOT ATTEMPTTO REPAIRDEFECTIVEPARTS.
(a)
Washalldisassembledpartsin a suitabledry cleaningsolvent.
(b)
Thoroughlycleanoff oldsealantandadhesive.
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