70

1.
Bracket,LockCylinder 38. Bolt Assembly

2.
LockCylinder 39. ValveAssembly

3.
BearingHinge 40. Housing, Gear

4.
Bracket,InboardDoor 41. Switch,Squat

5.
Hinge, Inboard Door 42. Link, Torque Upper

6.
Bearing,Hinge 43. Link,TorqueLower

7.
Door,Inboard 44. Line, Brake

8.
Bracket, Uplock Hook 45. StrutAssembly

9.
Spring,Uplock 46. Valve Assembly, Bleeder

10.
Bolt Assembly and Bushing 47. Brake Assembly

11.
Hook,Uplock 48. Bolt Assembly

12.
Bolt Assembly and Bushing 49. Wheeland Tire

13.
Nut, Lock 50. Hinge, Outboard Door

14.
Uplock Cable 51. Bearing, Hinge

15.
Actuator 52. Door, Outboard

16.
Switch,Uplock 53. Bracket, Door

17.
Wire Assembly 54. Rod, Retraction

18.
Bracket,Switch 55. Tube, Piston

19.
Bracket, Cylinder Mounting 56. Nut, Lock

20.
Nut,Lock 57. Washer

21.
CrankAssembly 58. Cylinder Assembly

22.
RodEnd 59. Valve

23.
DownlockCable 60. EmergencyUplock Release

24.
Nut,Lock 61. Dust Boot

25.
RodEnd 62. Pin,Downlock

26.
Arm, Gear Retraction 63. ClevisBolt

27.
Plate Attachment 64. Bushing

28.
Pivot Shaft 65. Washer

29.
Fitting,Shaft 66. Bolt,HookPivot

30.
Fitting,Grease 67. Bolt,AN178-33

31.
SideBrace, Upper Forward 68. Spring,Downlock

32.
Switch,Downlock 69. ShuttleValve

33.
Bracket,Switch 70. Door Ajar Switch

34.
Hook,Downlock 71. UplockActuator

35.
Side Brace, Lower 72. TrunnionBoltRetainer

36.
SideBrace,UpperAft 73. ForkAntirotation Stop (Clip)

37.
Plate,Mounting 74. Fork

MainGear Installation
Figure 401 (Sheet2 of3)

EFFECTIVITY:
040-999

PAGE4 32-10-00
Jan10/90
A. MainGearand Doors(continued) A
r
Sketch A

Bushing Bushing (42129-9) (42129-10) Washer
2 Req.)
MainGear Installation
Figure 401 (Sheet3 of 3)

EFFECTIVITY: 040-999
PAGE
32-10-00
Jan 10/90

PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

A. MainGear and Doors (continued)
3. Installationof Main Landing Gear (refer to 32-10-00 Figure 401)
CAUTION:  WHEN ASSEMBLING ANY UNITS, LUBRICATE BEARINGS, BUSHINGS, AND FRICTIONSURFACEWITHPROPER LUBRICANT.
(a) Positionattachmentplatesof landing gear housing andupperdrag links and bolt in place.
(b)Theup lock hookis installed as follows:
(1.) Place U end of the up lock spring over the back of the hook with loops toward the back.
(2.) Spreadthe spring andfit loops over bushing extending throughhook.
(3.) Slide hook inboard throughthe bracket until the bracket holealignswiththe bolt hole in
hook. (4.) Install pivot bolt and tighten so hook rotates freely without side play.
(c)
Attachup lock cable and blowdown uplock rod with sliding endsattachedto the hook and the other end of their fittings.

(d)
To install main gearhousingassembly,positiongear so attachment pointsonthe housing align with attachment plates. If needed, installspacerwashersbetweenattachmentsto allow a minimumamount of end play.Tightennut on each pivot bolt to a snug fit,allowinggear to swing free and safety and install main landinggearbolt retainers (forwardandaft).

(e)The upper and lower side brace link assemblyis installed as follows:
(1.) Reinstallpivot shaft (forward upper side brace link) spar attachment fittingas follows:
(a.) Slide a washerover each bolt.Insert bolts through appropriatemountinghole in the fitting. (b.) With bolts in their fittings,installthe required shimsto correctly space fitting away from the spar for proper positioningof the pivot shaft. (c.) Withshimson the bolts of the fitting, carefullyinsertfittingthrough access holeand bolt the fitting to thespar.
(d.) After the fourboltsare tightened, removeoneboltat a time andreinstallthem so only onethread is engagedin the spar rivnut. Pull on the bolt and check distancebetween bearingsurfaceof bolt headand the pivot shaft fitting(or surface of washer). The allowabletoleranceof the gap is 0.370 inchminimumto 0.385 inch maximum. One additional0.03125(1/32)inch washer can be used under thebolt head to prevent the unthreadedshank from bottoming in the rivnut. If the gap is not big enough, usethe nextsize AN-4-##A bolt (refer to 32-10-00 Figure 401). Reinstalleachbolt and torqueto 70 inch-pounds.
(2.) Slide pivot shaftthroughattachmentplate mounted to the wheelwell and into the attachmentfittingonthe spar. Securepivotshaft at attachment fitting. (3.) Checkthatthe forward upperarm is installedonthe link, install thelink on the pivot shaft and secure itwith washers and nut. (4.) The aft upperdrag link is installed by slidingthe link on aft attachmentplate pivot bolt. Tightennutto allow linkto swing free with no side play;safetythe nut. (5.) Positionlowerlinkbetweenupperdraglinkends,installthe bolt assembly and tighten, allowingthelink to turn free with no side play. (6.) Attachlowerdrag link to landinggearhousing;secureand safety. Movegearin and outof the down lock positionseveraltimestoensure no binding exists.
　
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