Piper SEMINOLE PA-44-180, Maintenance Manual

Page: 345 / 881

OILDYNE HYDRAULIC PUMPS.
REMOVAL OF OILDYNE HYDRAULIC PUMP (Refer to Figure 29-5, Sheet 1 of 2)
The Oildyne hydraulic pump with reservoir incorporated is located in the aft section of the fuselage
between stations 156 and 191. Access to the pump is through the access panel in the baggage compartment.
1. Remove the ABS nose gear cover.
2. Remove anti-splash cover (Piper P/N 96374-0) by removing the four attaching screws,
3 . Disconnect the three knife connectors that attach the black, blue, and green forward and reverse
h a rness wires.
4. Disconnect and plug the UP and DOWN pressure hydraulic lines from pump mount. Cap the lines .
5. Remove the three each mounting bolts and washers securing pump mount to deck
6. Lift assembly from airplane.
FIELD SERVICE OF OILDYNE HYDRAULIC PUMP
Field service of Oildyne hydraulic pump is limited to motor replacement and removal, cleaning, and
inspecting the hydraulic fluid reservoir. Should pump malfunction, either replace pump, or return pump to
Piper Aircraft, via the local Piper distributor, for servicing or repairs.
DISASSEMBLY OF OILDYNE HYDRAULIC PUMP FROM BRACKET (Refer to Figure 29-5, Sheet 1
of 2)
1. Remove safety wire securing two bolts that attach bracket to pump.
2. Remove the two bolts and washers.
3. Separate pump assembly from bracket.
D I S A S S E M B LY OF MOTOR ASSEMBLY FROM OILDYNE PUMP-ADAPTER ASSEMBLY (Refer to
Figure 29-5, Sheet 2 of 2)
1. Remove two each mounting bolts on flange of motor assembly and separate the motor assembly from
the pump.
2. Remove coupling and O-ring and discard.
— NOTE —
New O-ring and coupling are included in replacement motor
assembly.
D I S A S S E M B LY OF RESERVOIR ASSEMBLY FROM OILDYNE PUMP-ADAPTER ASSEMBLY
(Refer to Figure 29-5, Sheet 2 of 2)
— CAUTION —
DO NOT DISASSEMBLE PUMP ASSEMBLY FROM
ADAPTER ASSEMBLY. DAMAGE TO VA LVES AND
P R E SSURE SETTINGS, WHICH ARE NON-ADJUSTABLE,
WILL OCCUR.
1. Remove screw and O-ring securing the reservoir to the adapter assembly.
2. Remove reservoir and reservoir seal.
3. When replacing reservoir, remove the cushion pad. It will have to be bonded to the new reservoir base
using Scotch Grip 2210 or Contact Adhesive B-10161 rubber cement.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
29-11-25
Page 29-18
Added: June 20, 1995
2C13