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Model: 5731
Hydraulic Power Unit
08/2016 | Rev. 08
Page | 18
8.0
TROUBLE SHOOTING
(continued)
8.3
REDUCED FLOW
Possible Cause
Solution
Flow control is set too low ................................................... Increase flow setting.
Pressure adjustment is set too low. ..................................... Slightly increase pressure setting.
Pressure compensator control is ......................................... When system pressure exceeds the compensator control setting, or
reducing pump output
when the system no longer requires flow, the control de-strokes the
pump while maintaining the preset pressure.
Pump inlet is not receiving enough fluid ..............................
Follow the procedure for “Air in pump inlet lines” in Section 8.2.
(cavitation)
Motor is “Single Phasing” .................................................... Motor is not getting power on all three phase legs. Check across-
the-line voltage on all three phase legs.
Supply voltage is 50 Hz ....................................................... Pumps used on 50 Hz units will flow at only 83% of the pump
nameplate rating. An HPU designed to run on 50 Hz will supply flow
as stated in the specifications for that unit.
8.4
NO PRESSURE or REDUCED PRESSURE
Possible Cause
Solution
Pressure adjustment is set too low ...................................... Increase pressure adjustment.
Motor is “Single Phasing” .................................................... Motor is not getting power on all three phase legs. Check across-
the-line voltage on all three phase legs.
Pump inlet is not receiving enough fluid ..............................
Follow the procedure for “Air in pump inlet lines” in Section 8.2.
(cavitation)
Flow path is open ................................................................ Pressure is resistance to flow. The HPU will reach full pressure as
flow paths (such as moving actuators and open valves) are closed.
8.5
FLUID OVERHEATS
Possible Cause
Solution
Fan is not functioning properly ............................................ Check the cooler fan output. Forced air should be easily detected at
the right hand side of the HPU. Check the fuses for the fan motor
(See Appendix Electrical Schematic INS-1608).
Bypass valve or rear ball valve is being .............................. The bypass valve and all ball valves must be used in a fully open or
used in a partially closed position ........................................ fully closed position. These valves are not intended for metering
flow. All flow adjustments must be made using the pump flow
control.
8.6
HAND PUMP (
Option M)
IS NOT PUMPING FLUID
Possible Cause
Solution
Release screw is open ........................................................ Use the slotted end of the pump handle to close the release screw
located at the base of the pump.
Ball valve is closed .............................................................. Open the ball valve for the pump inlet line located at the bottom of
the reservoir.
Pump piston is filled with air ................................................ If the pump is not primed after several strokes, remove the bleed
screw from the top of the pump piston (see section 9.13.9.a
Pump Diagram). Slowly stroke the pump until fluid is present at the
bleed screw. Replace the bleed screw.
Summary of Contents for 5731
Page 55: ...Model 5731 Hydraulic Power Unit 08 2016 Rev 08 Page 50 This page left blank intentionally...
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Page 67: ...APPENDIX I Declaration Of Conformity...
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Page 71: ...APPENDIX II Hydraulic Schematic INS 1660...
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Page 73: ...APPENDIX III Electrical Schematic INS 1608 INS 2016...
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Page 75: ...APPENDIX IV Wiring Diagram INS 1597 INS 2046...
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Page 77: ...APPENDIX IV Lincoln Motor Manual...
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Page 83: ...APPENDIX V Oilgear Pump Manual...
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Page 101: ...APPENDIX VI Material Safety Data Sheet MSDS Hydraulic Fluid...
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Page 111: ...APPENDIX VII ANSI B93 19M 1972 R1993 Excerpt...
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Page 117: ...APPENDIX VIII Instrument Certification Notice...
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