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Fluid Power Information Center

Incorrect Pressure Chart for Hydraulic systems

INCORRECT PRESSURE

A
B
C
D
NO PRESSURE
LOW PRESSURE
ERRATIC PRESSURE
EXCESSIVE PRESSURE
No flow
Refer to INCORRECT FLOW CHART
Pressure relief path exists
Refer to INCORRECT FLOW CHART cols:A&B
Air in fluid
Remedy: b
Pressure reducing, relief or unloading valve misadjusted
Remedy: d
Pressure reducing valve set too low
Remedy: d
Worn relief valve
Remedy: e
Yoke actuating device inoperative(variable displacement pumps)
Remedy: e
Pressure reducing valve damaged
Remedy: e
Contamination in fluid
Remedy: a
Pressure reducing, relief or unloading valve worn or damaged
Remedy: e
Damaged pump, motor or cylinder
Remedy: e
Accumulator defective or has lost charge
Remedy: c
Worn pump, motor or cylinder
Remedy: e

Remedy:a
Replace dirty filters and system fluid
Remedy:b
Tighten leaking connections(fill reservoir to proper level and bleed air from system).
Remedy:c
Adjust, repair or replace.
Remedy:d
Clean and adjust or replace; check condition of system fluid and filters
Remedy:e
Overhaul or repair.
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