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Fluid Power Information Center

Faulty Operation Chart for Hydraulic systems

FAULTY OPERATION

A
B
C
D
NO MOVEMENT
SLOW MOVEMENT
ERRATIC MOVEMENT
EXCESSIVE SPEED OR MOVEMENT
No flow or pressure
Refer to INCORRECT FLOW CHART
Low flow
Refer to INCORRECT FLOW CHART
Erratic pressure
Refer to INCORRECT PRESSURE CHART
Excessive flow
Refer to INCORRECT FLOW CHART
Limit or sequence device (mechnical, electrical or hydraulic) inoperative or misadjusted
Remedy: e
Fluid viscosity too high
Remedy: a
Air in fluid
Refer to EXCESSIVE NOISE CHART
Feedback transducer malfunctioning
Remedy: e
Mechanical bind
Remedy: b
Insufficient control pressure for valves
Refer to INCORRECT PRESSURE CHART
No lubrication of machine ways or linkage
Refer to INCORRECT PRESSURE CHART
Misadjusted or malfunctioning servo amplifier
Remedy: c
No command signal to servo amplifier
Remedy: f
No lubrication of machine ways or linkage
Remedy: g
Erratic command signal
Remedy: f
Over-riding work load
Remedy: h
Inoperative or misadjusted servo amplifier
Remedy: c
Misadjusted or Malfuctioning amplifier
Remedy: c
Misadjusted or Malfuctioning amplifier
Remedy: c
Inoperative servo valve
Remedy: c
Sticking servo valve
Remedy: c
Malfunctioning feedback tranducer
Remedy: e
Worn or damaged cylinder motor
Remedy: e
Worn or damaged cylinder motor
Remedy: e
Sticking servo valve
Remedy: d
Worn or damaged cylinder or motor
Remedy: e

Remedy:a
Fluid may be too cold or should be changed to clean fluid of correct viscosity
Remedy:b
Locate bind and repair.
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.
Remedy:f
Repair command console or interconnecting wires
Remedy:g
Lubricate
Remedy:h
Adjust,repair or replace counterbalance valve
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