Piper Arrow IV, Maintenance Manual

Page: 470 / 752

REMOVAL OF VACUUM PUMP.
1. Remove the top portion of the engine cowling. (Refer to Chapter 71.)
2. Loosen the hose clamp and remove the hose from the pump fitting.
3. Remove the four retaining nuts, lock washers and plain washers used to secure the pump to the engine;
then remove the pump.
REPLACING PUMP FITTINGS.
1. Before installing any fittings on the pump, check for any external damage. A pump that has been
damaged or dropped should not be installed.
2. When a vise is used to hold the 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 the pump firmly.
—CAUTION—
DO NOT apply vise pressure to the outside diameter or overall
length of the pump.
3. The ports of the AIRBORNE pump have been treated with a dry film lubricant and the AIRBORNE
fittings are cadmium plated thus eliminating any need for thread lubricants. If 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.
—CAUTION—
DO NOT use pipe tape, thread dope, hydrocarbon oil or grease,
as these can contaminate the pump and cause malfunction.
4. With the pump properly secured in the vise, insert fittings in ports and hand tighten firmly.
5. Using a wrench, tighten each fitting from one-half to two additional turns.
INSTALLATION OF VACUUM PUMP.
1. Place the pump gasket in its proper place and align the spline on the pump drive with the spline on the
engine drive assembly.
—CAUTION—
The only pump mounting gasket authorized and approved for use
on the Airborne vacuum pump is the Airborne gasket B3-1-2,
Piper part number 751 859. Use of any other gasket may result in
oil seepage or leakage at the mounting surface.
37-10-05
Page 37-05
December 1, 1978
2H23
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL