(b)
LubricateO-ringand installinto power packbody.
(c)
Ensurepoppetseatcontainssharpseatingedge. Lap as required to obtainsharpseatingedge. Push poppet seatintovalvebody,installassemblyinto power pack body,andtorqueto 70 inch-pounds.
(d)
Installbutton;springand securewith adjusting screw. Adjustingscrew provides adjustmentfor priorityvalveand mustbe installedflush.
EFFECTIVITY: PAGE 22 040-999 Jan 10/90 29-10-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. Main (continued)
36. Adjustment of Priority Valve. (Figure 403)
(a)
Place input shaft in gear up position. Remove cap from gear up fitting.
(b)
Apply pressure and note priority valve cracking pressure by observing pressure gauge when fluid first starts to flow from gear up port.
(c)
Adjust screw until priority valve cracks at 600 -650 psi ( 29-00-00, Chart 2). Bleed pressure after each adjustment by cracking cap on door open fitting.
(d)
Disconnecttest unit and cap all open fittings.
37. Disassembly of Time Delay Check Valve. (Figure 403, Item 59)
(a)
Remove check valve body from power pack body.
(b)
Remove snap ring.
(c)
Using a brass hook, pull out ball seat.
(d)
Remove ball and spring.
38. Assembly of Time Delay Check Valve. (Figure 403, Item 59)
(a)
Install spring and ball into check valve body.
(b)
Lubricate and install O-ring in seat.
(c)
Install seat into check valve body. Secure with snap ring.
(d)
Lubricate threads, install O-ring on valve body, mount into power pack body, and torque to 45 inch-pounds.
39. Disassemblyof Door Vent Valve. (Figure 403, Item 26)
(a)
Remove adjusting screw from top of retainer.
(b)
Remove vent valve body from power pack body.
(c)
Remove spring and stem.
(d)
Cut wire and remove retainer from vent valve body.
(e)
Remove O-ring and piston.
40. Assembly of Door Vent Valve. (Figure 403, Item 26)
(a)
Install piston into vent valve body.
(b)
Lubricateand install O-ring on retainer. Screw retainer into valve body; tighten and secure with
0.032inch safety wire.
(c)
Install stem, spring, and adjusting screw into retainer, ensuring adjusting screw is flush.
(d)
Lubricatethreads, install O-ring on valve body, and install assembly into power pack body.
41. Adjustment of Door Vent Valve. (Figure 403, Item 26)
(a)
Remove cap from door open fitting on power pack. Attach pressure hose from hand pump to door fitting with 200 psi pressure gauge.
(b)
Slowly apply pressure to ensure fluid seeps from door vent valve.
(c)
Adjust screw so fluid flows from vent valve at 0 to 100 psi ( 29-00-00, Chart 2).
(d)
Increasepressure to 150 psi maximum. Ensure door vent valve is shut off. If pressure falls below 100 psi, fluid must resume flowing from door vent valve ( 29-00-00, Chart 2).
(e)
Relieve pressure by cracking hose fitting from hand pump.
(f)
Disconnecttest unit. Cap all open fittings.
EFFECTIVITY:
29-10-00Jan
Jan109010/90
PIPERAIRCRAFT
PA-42-720(Advanced Tralner)
MAINTENANCEMANUAL
A. Main(continued)
42.Disassemblyof VentFilter.(Figure403)
(a) Removesnapringand pull out filter.
43.Assemblyof Vent Filter.(Figure403)
(a) Installventfilterintoreservoircover.Securewithsnapring.
44. Disassembly (Figure403) of Standpipe-Filter.
(a) Removestandpipe-filterfrompowerpackbody.
45.Assemblyof Standpipe-Filter. (Figure403)
(a) Installstandpipe-filterintopowerpackbody.
46. DisassemblyofHandPumpCheckValve.(Figure403,Item88)
(a)
Removefittingfrompowerpackbody.
(b)
Removesnapringfromfitting.
(c)
Removeguide,spring,andpoppet.
47.AssemblyofHandPumpCheckValve.(Figure403,Item88)
(a) Installpoppet,spring,andguideintofitting.Securewithsnapring.
(b)Lubricatethreadsonfittingvalve.InstallrequiredO-ringclosestto flanged end.
(c)
Installbackup ringandO-ringonfitting.
(d)
Installvalve assembly in body. Torqueto 55 inch-pounds.
48. Disassemblyof Hand PumpReliefValve.(Figure403,Item51)
(a)Removeadjustingscrewattopof hand pumpreliefvalve.
(b)Removehandpumpreliefvalve body byunscrewingit from powerpackbody.
(c)
Removespringandstemfromvalvebody.
(d)
Removeball.
(e)
Usebrasshookand carefully removeseatfrombody.Becarefulnot to damage bore.
(f)
RemoveO-ringfrom bottom of cavity.
49. AssemblyofHandPumpReliefValve.(Figure403, Item 51)
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