a.
Before installing any fittings on the pump, check for thread damage.
CAUTION
Do not secure the pump in the raw steel jaws of a vice for installation of
fittings. Caution must be taken to avoid pump damage by installing
protective sleeves to the vice and using only enough pressure to hold the
pump firmly. Do not apply vise pressure to the outside diameter or overall
length of the pump.
b. With the pump properly secured, insert fittings into the ports and hand tighten firmly; then using a
wrench, tighten each fitting from one-half to two additional turns.
CAUTION
The only pump mounting gasket authorized and approved for use on the
AIRBORNE vacuum pump is AIRBORNE gasket B3-1-2, Piper Part
Number 751 859. Any other gasket could result in oil seepage or leakage at
the mounting flange.
c.
Place pump gasket in place and align spline on pump drive with spline on engine drive assembly.
d. Secure pump to engine with four plain washers, lockwashers, and retaining nuts.
e.
Tighten the four nuts to a torque of 50 to 70 inch-pounds.
f.
Snug one locknut on each of the four retaining nuts.
g. Remove all plugs and caps from the fittings and hoses and secure the hoses to the pump with clamps.
h. After a functional operation check, replace the top cowling.
10-12. AUXILIARY VACUUM PUMP (Serial Numbers 2837001 and up of PA-28R-201 and 2803001 and up
of PA-28R-201R models). (Refer to Table 10-1 for Troubleshooting Instructions.)
CAUTION
When replacement of the auxiliary pump is required, the complete pump
and motor must be replaced with a new operational unit. It is important that
repair is made by authorized maintenance personnel only for proper
operation.
a.
The auxiliary vacuum pump is mounted on the right side of the firewall and serves as a backup to the
engine operated pump if it should fail to operate the gyro instruments. There is a 20 amp circuit
breaker in the system that protects the pump motor and a 5 amp circuit breaker that protects the
annunciator light switch.
b. Auxiliary Vacuum Pump Engine Off Operational Check.
CAUTION
Excessive running of the auxiliary pump will weaken the battery to an
unreliable charge level. Ensure that all electrical equipment is off before
beginning engine off operational check. Operate system as short a time as
possible.
Revised: 2/13/89
2F15
CHEROKEE ARROW III SERVICE MANUAL
INSTRUMENTS
Summary of Contents for ARROW III
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