Vacuum Pump - Piper COMANCHE PA-24-180 Service Manual

PIPER COMANCHE SERVICE MANUAL
11-16. Vacuum Pump Installan.
The vacuum pump is mounted u follows
a
Remove the top porion of the engine cowling.
b. Align spline on the pump drive with spline on the engine drive asembly.
c. Secure pump to engine drive aembly uaing four retaining nus, lock wahem and plain washers.
d. Connect the inlet and oudet hoses to their repective firrmng on the vacuum pump usng two hose
clamps.
e. Check ll connections for security and reinall the top engine cowling.
11-17. Troubleshetling.
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TABLE XI-I. VACUUM SYSTEM
Troble
Cause
No vacuum pressure gauge
indication.
No vacuum pressure gauge
indication at insrumet.
No vacuum sucion gauge
indication at either
instrument or source.
Low vacuum system
pressure.
Pump inoperative. Dsu-
connected. Broken or
resricted lines.
Hose from insrument to
gauge leaking or restricted.
Faulty gauge. Malfunctioning.
regulator valve, or
vacuum pump.
Vacuum regulator valve
incorrectly adjusted.
Leaking of the system
lines or fitting.
Replace pump. Locate
trouble and correct.
Check all lines and
connections.
Check operanon of insuru-
mens. If operation is
normal, replace gauge.
If instrument are n-
operanve. check operation
of vacuum pump or regulator
valve.
Adjust regulator valves in
accordance with (Adjust-
ments) of thu ection.
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Check all lines and fittings.
Normal prersure indication.
but sluggish operation
of instruments.
High system pressure.
Instruments ir filter
demens dirry.
Vacuum regulator valve
sncking or dirty screen.
Remove and dean or replace.
Clean and check operation
of regulator valve.
INSTRUMENTS
REVISED: 6/25/6
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3 F23