Disassembly Of Vent Filter; Assembly Of Vent Filter; Disassembly Of Standpipe-Filter; Assembly Of Standpipe-Filter - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Tralner)
MAINTENANCE MANUAL
A. Main (continued)
42. Disassembly of Vent Filter. (Figure 403)
(a) Remove snap ring and pull out filter.
43. Assembly of Vent Filter. (Figure 403)
(a) Install vent filter into reservoir cover. Secure with snap ring.
44. Disassembly of Standpipe-Filter. (Figure 403)
(a) Remove standpipe-filter from power pack body.
45. Assembly of Standpipe-Filter. (Figure 403)
(a) Install standpipe-filter into power pack body.
46. Disassembly of Hand Pump Check Valve. (Figure 403, Item 88)
(a) Remove fitting from power pack body.
(b) Remove snap ring from fitting.
(c) Remove guide, spring, and poppet.
47. Assembly of Hand Pump Check Valve. (Figure 403, Item 88)
(a) Install poppet, spring, and guide into fitting. Secure with snap ring.
(b) Lubricate threads on fitting valve. Install required O-ring closest to flanged end.
(c) Install back up ring and O-ring on fitting.
(d) Install valve assembly in body. Torque to 55 inch-pounds.
48. Disassembly of Hand Pump Relief Valve. (Figure 403, Item 51)
(a) Remove adjusting screw at top of hand pump relief valve.
(b) Remove hand pump relief valve body by unscrewing it from power pack body.
(c) Remove spring and stem from valve body.
(d) Remove ball.
(e) Use brass hook and carefully remove seat from body. Be careful not to damage bore.
(f) Remove O-ring from bottom of cavity.
49. Assembly of Hand Pump Relief Valve. (Figure 403, Item 51)
(a) Lubricate and install O-ring into power pack body.
(b) Inspect seat seating surface. Seating edge must be sharp. Lap if necessary to obtain clean,
sharp edge.
(c) Drop ball into cavity of hand pump relief valve body. Install ball seat into body, trapping ball
between two parts.
(d) Lubricate threads and install assembly into power pack body. Torque to 70 inch-pounds.
(e) Insert stem and spring into valve body. Install adjusting screw. Adjusting screw provides
adjustment for hand pump relief valve and must be installed flush.
EFFECTIVITY:
040-999
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10/9029-10-00