Piper Arrow IV Turbo Maintenance Manual page 342

CHART 2903. CHARACTERISTICS, HYDRAULIC PUMP MOTOR
Electrical Characteristics:
Voltage
Rotation
Polarity
Operating Current
Operating Time
Overload Protection
Automatic Reset Time
Location, Automatic Reset
Mechanical Characteristics:
Bearings
End Play, Armature
H. Should it be necessary to check the pump motor, first connect the ammeter in the electrical circuit
with the positive terminal of the meter to the black lead and the negative terminal of the meter to
negative terminal of the DC power supply.
I. Connect the blue lead to the positive terminal of the power supply. With the high pressure
indication within the 1600 to 2000 psi range (2000 to 2500 psi on Piper P/N 67509-2) on the
pressure gauge, the ammeter should read between 35 to 60 amperes. Disconnect the electrical lead.
J. Connect the green lead to the positive terminal of the power supply. With the high pressure
indication within the 500 to 800 psi range, the ammeter should read between 15 to 35 amperes.
In the event that any of the various tests do not perform
s a t i s f a c t o r i l y, the pump assembly should be overhauled or
replaced.
K. Connect the green lead to the power supply to drop pressures before disconnecting the hydraulic
lines.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
14 DC
Reversible
Negative ground
18 amps, max. at 14-volts (both rotations)
5 to 10 seconds with a current load of
Thermal circuit breaker
12 seconds, max.
Commutator end head of motor
Absorbent bronze
Steel ball
.005 inch, min.
(Adjust by selection of thrust washers on
drive end of armature shaft.)
—NOTE—
2C15
100 amps at 77°F.
(Drive end bearing in upper pump and
valve assembly casting.)
(Thrust, between commutator end head
and end of armature shaft.)
Revised: November 6, 1979
29-10-06
Page 29-21