THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 3
Jun 1/03
3K7
37-10-00
C. Installation
NOTE: Change the vacuum system filter when installing a new pump.
(1) If required, install fittings on pump per Replacing Pump Fittings, below.
CAUTION: ONLY PUMP MOUNTING GASKET AUTHORIZED AND APPROVED FOR USE
ON AIRBORNE VACUUM PUMP IS AIRBORNE GASKET B3-1-2, PIPER PART
NUMBER 751-859. USE OF ANY OTHER GASKET MAY RESULT IN OIL
SEEPAGE OR LEAKAGE AT MOUNTING SURFACE.
(2) Place pump gasket in its proper place and align spline on pump drive with spline on engine
drive assembly.
(3) Secure pump to engine with four plain washers, lock washers and retaining nuts. Torque nuts
50 to 70 inch-pounds.
(4) Connect hoses to pump and secure with hose clamps.
(5) Reinstall engine cowling.
D. Replacing Pump Fittings
CA
UTION: WHEN REPLACING ANY OF THE THREADED FITTINGS, DO NOT USE PIPE
DOPE, THREADLUBE, OR TAPE. PIPE DOPE / TAPE PARTICLES INGESTED BY
THE VACUUM PUMP COULD CAUSE THE PUMP TO FAIL. USE ONLY SILCONE
SPRAY, LETTING IT DRY BEFORE ASSEMBLY.
(1) Before installing any fittings on pump, check for any external damage. A pump that has been
damaged or dropped should not be installed.
CA
UTION: DO NOT APPLY VISE PRESSURE TO OUTSIDE DIAMETER OR OVERALL
LENGTH OF PUMP.
(2) When a vise is used to hold pump while installing fittings, suitable caution must be exercised to
avoid pump damage. Square mounting flange must be held between soft wood blocks and only
at right angles to vise jaws. Use only enough vise pressure to hold pump firmly.
(3) The ports of AIRBORNE pumps have been treated with a dry film lubricant and AIRBORNE
fittings are cadmium plated thus eliminating any need for thread lubricants. If thread
lubricant is required, use only a silicone spray. Apply sparingly to external threads of
fittings only and let dry before assembly.
4. V
acuum Regulators (See 37-00-00, Figures 1 and 2.)
Two (2) vacuum regulators are incorporated in the system to control vacuum pressure to gyro
instruments. The regulators are located below the forward baggage compartment floor.
A. Service Tips
(1) Vacuum regulators seldom need replacement. Symptoms that suggest replacement are:
(a) Chatter as indicated by rapid fluctuation of vacuum gauge needle or an audible sound.
(b) Non-repeatability of vacuum gauge reading when panel gauge is not suspect or has been
checked against a known test gauge (cruise RPM only).
(2) All modes of regulator malfunction tend to increase vacuum power applied to gyros. Thus,
although excess vacuum is applied, a loss of vacuum does not occur.
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