Piper SENECA II - Page 339

PIPER SENECA II SERVICE MANUAL
11. Connect the green lead from the pump motor to the positive terminal of the power supply. With
low pressure indication within the 500 to 800 psi range, the ammeter should read between 15
to 35 amperes.
NO
TE: In the event any of the various tests do not perform satisfactorily, the pump assembly
should be replaced.
12. Disconnect the green lead from the power supply and permit the pressure to drop before
disconnecting the hydraulic lines.
01/01/09 VI - HYDRAULIC SYSTEM
1I13
TABLE VI-II. CHARACTERISTICS, HYDRAULIC PUMP MOTOR
Electrical Characteristics: Prestolite Oildyne
Voltage 12 DC 12 DC
Rotation Reversible Reversible
Polarity Negative ground Negative ground
Operating Current 75 amps, max. at 12 volts 25 amps, max. at 12 DC
(both rotations) volts (both rotations)
Operating Time 12 seconds max. with a current Continuous with circuit
load of 75 amps at 77° F breaker protection
Overload Protection Thermal circuit breaker Thermal circuit breaker
25 amp
Automatic Reset Time 12 seconds, max.
Location, Automatic Reset Commutator end head of motor
Mechanical Characteristics: Prestolite Oildyne
Bearings Absorbent bronze N/A *
(Drive end bearing in upper pump
and valve assembly casting)
Steel ball
(Thrust, between commutator
end head and end of armature
shaft)
End Play, Armature .005 inch, min. N/A *
(Adjust by selection of thrust
washers on drive end of
armature shaft)
* NO
TE: Since the Oildyne hydraulic pump has a sealed motor assembly, with disassembly not
approved, there are no mechanical characteristics.