(b)
Use new O-rings and gaskets during assembly.
(c)
Lubricate all O-rings with petrolatum (per W-P-236 or equivalent) during assembly.
(d)
Lubricate all threaded surfaces of all valves in power pack with MIL-G-7711 grease or equivalent before installing.
NOTE: When positioning reservoir cover, ensure vent fitting points to right when power pack is installed in airplane. Also, when installing reservoir cover, ensure large O-ring is not being pinched.
(e)
Install reservoir cover on reservoir, secure with nut, and torque to 35 inch-pounds. Safety nut to reservoir cover using safety wire.
EFFECTIVITY:
040-999 10/90
29-10-00Jan10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Main (continued)
36
NOTE:Theshadedparts,poppet (6) and poppet seat (7) are matched partsand must be replacedas an assembly.
0-55
56
--57
HydraulicPowerPack
Figure 403 (Sheet1 of 2)
EFFECTIVITY: 040-999
PAGE12 29-10-00
Jan 10/90
A.
1.
2.
3.
4.
5.
6.
7.
8.
9.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
10.
Priority Valve
11.
AdjustingScrew
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
41.
Deflector Plate
42.
Filter,Vent
43.
Snap Ring
44.
O-Ring
45.
Center Stud
46.
Snap Ring
47.
BafflePlate
48.
O-Ring
49.
Reservoir
50.
O-Ring
51.
Hand Pump Suction Filter
52.
Snap Ring
53.
Filter,Hand Pump
54.
Hand Pump Relief Valve
55.
Adjusting Screw
56.
Spring
57.
Stem
58.
Body, Secondary Relief Valve
59.
Ball
60.
Seat
61.
O-Ring
62.
Time Delay Check Valve
63.
Snap Ring
64.
O-Ring
65.
Seat
66.
Bal
67.
Spring
68.
Body, Check Valve
69.
O-Ring
70.
Body
71.
O-Ring
72.
Backup
73.
Nut
74.
Fitting
75.
Bolt
76.
Washer
77.
Bolt
78.
Washer
Main (continued)
Main Relief Valve AdjustingScrew Spring Button Body, Relief Valve Poppet Poppet Seat Backup
O-Ringl
Spring Button Body,Priority Valve Backup O-Ring Backup O-Ring Poppet PoppetSeat O-Ring
Fitting Nut Backup O-Ring
Door Vent Valve Adjusting Screw Spring Stem Retainer O-Ring Piston Wire, Safety Body,Vent Valve O-Ring
Nut Cover,Reservoir Wire, Safety O-Ring Fitting
79.
Bracket Assembly
80.
Bracket
81.
Plug,Electrical
82.
Screw
83.
Washer
84.
TerminalBlock
85.
Spring Cartridge
86.
Snap Ring
87.
Button
88.
Spring
89.
Plunger
90.
Body, Handle Release
91.
Screw, Stop
92. Hand Pump Check Valve
93. Fitting
94. O-Ring
95. Backup
96. O-Ring
97. Poppet
98. Spring
99. Guide
100.
Snap Ring
101.
Fitting
102.
O-Ring
103. Standpipe-Filter
104. Fitting
105. Nut
106. Backup
107. O-Ring
Hydraulic Power Pack
Figure 403 (Sheet 2 of 2)
EFFECTIVITY:
040-999
29-10-00 PAGE
Jan10/9013
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Main (continued)
18. Cleaning,Inspectionand Repairof Power Pack.
(a)
Discardall old O-rings and gaskets.
(b)
Removeline fittings caps, wash all parts in dry cleaning solvent (Federal Specification P-S-661, or equivalent), and dry with filtered compressed air.
NOTE: During inspection and until power pack is reassembled, keep parts as clean as possible. After cleaning parts, place on clean surface and cover with clean cloth.
(c)
Inspect all parts for scratches, scores, chips, cracks, and excess wear.
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