Removal Of Dry Pneumatic Pump - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
10-11. REMOVAL OF DRY PNEUMATIC PUMP.
a.
Remove engine cowling and locate the pneumatic pump at the top center aft of the engine.
b.
Remove hose clamps on inlet and outlet sides of pump.
c.
Disconnect hoses from both sides of the pump.
d.
Disconnect the four nuts securing the pump and remove the pump.
NOTE
Before installation of fittings on pump, check for external damage.
A pump that has been damaged or dropped should not be
installed. When a vise is used to secure pump while installing
fittings, suitable caution must be exercised to avoid pump damage.
The square mounting flange must be held between soft wood
blocks and only at right angles to the vise jaws. Use only enough
vise pressure to hold pump firmly. DO NOT apply vise pressure to
outside diameter or overall length. The ports of the AIRBORNE
dry air pump have been treated with a dry film lubricant and the
AIRBORNE fittings are cadmium plated thus eliminating any need
for thread lubricants. If a thread lubricant is required, use a
powdered moly sulfide or graphite in dry form or in an
evaporating vehicle; or employ a silicone spray. Apply sparingly to
external threads of fittings only. DO NOT use pipe tape, thread
dope, hydrocarbon oil or grease, as these can contaminate pump
and cause malfunction. With pump properly secured in vise, insert
fittings in ports and hand tighten firmly. Next, using a wrench,
tighten each fitting from one-half to two turns additional.
Reissued: 9/23/80
INSTRUMENTS
3A16