Piper Arrow IV, Maintenance Manual

Page: 337 / 752

CHART 2902. LEADING PARTICULARS, HYDRAULIC SYSTEM
Hydraulic Pump 67509 67509-02
High Pressure 1600 to 2000 psi 2000 to 2500 psi
Low Pressure 650 ± 150 psi 650 ± 150 psi
Flow Rate @ 1000 psi 45 cu. in. per min. 45 cu. in. per min.
High Pressure Control 1600 to 2000 psi 2000 to 2500 psi
Thermal Relief 4000 psi 2000 to 2500 psi
Hydraulic Fluid MIL-H-5606 MIL-H-5606A
Pressure Switch
Open (OFF) Pressure 1400 ± 100 psi 1800 ± 100 psi
Close (ON) Pressure 400 ± 200 psi below 300 ± 100 psi below
opening pressure opening pressure
MAIN.
HYDRAULIC PUMP.
REMOVAL OF HYDRAULIC PUMP.
The hydraulic pump with reservoir incorporated is located in the aft section of the fuselage. Access to the
pump is through the access panel in the aft wall of the baggage compartment.
1. Disconnect the pump electrical leads from the pump solenoid relays and the ground wire from the
battery shelf.
2. Disconnect the hydraulic lines from the pump. Cap the line ends to prevent contamination.
3. Remove the pump by removing the pump attaching bolts.
DISASSEMBLY OF HYDRAULIC PUMP. (Refer to Figure 29-5.)
After the hydraulic pump has been removed from the airplane, cap or plug all ports and clean the exterior
of the pump with a dry type solvent to remove accumulated dust or dirt. To disassemble any one of the three
main components of the pump, proceed as follows:
1. The base of the pump may be removed from the case as follows:
A. Cut the safety wire and remove the bolts with washers that secure the base to the pump case.
B. The shuttle valve within the base should be removed for cleaning purposes only. To remove the
valve, cut safety wire. Remove plug with spring and valve.
—NOTE—
The shuttle valve and pump base are matched, lapped parts.
Should it be necessary to replace, replace as an assembly only.
29-10-03
Page 29-16
Revised: November 6, 1979
2C10
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL