Hyquip provides a wide range of components and installation materials for production automation and hydraulic engineering. Plus total solutions including design, installation and commissioning with problem solving service.
Telephone HYQUIP on +44 (0) 1204 699959Telephone HYQUIP on +44 (0) 1204 699959
 
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HYQUIP Contact Details
Hyquip Limited
New Brunswick Street
Horwich Bolton
Lancashire BL6 7JB
Tel:
+44(0)1204 699959
Fax:
+44(0)1204 699542
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HYQUIP Fault Finder

fault finder

Scroll down for remedies to common faults:

fault finder

LACK OF DELIVERY

  cause   remedy
  Incorrect rotation of pump   Reverse immediately
  Oil level in reservoir too low   Top up with correct filtered fluid
  Loose suction line connection   Check/tighten pipe fittings
  Suction pipe or strainer blocked   Clean if possible or replace
  Incorrect viscosity of fluid   Check with pump makers specifications
  Air breather blocked   Check and clear
  Pump parts broken   Replace or repair if possible
  Relief valve jammed open   Clean and adjust valve, replace if neccesary
  Pump speed to low   Check speed with makers modifications
  Loss of accumulator precharge   Check pressure against design specification
  Incomplete valve action   Isolate valve and check operation
  Incorrect assembly, broken drive coupling   Rectify
  Incorrect pump setting   Check and adjust if possible
  Blocked filter   Clean if possible or replace

fault finder

LACK OF PRESSURE
  cause   remedy
  Is there a lack of delivery   Check with 'Lack Of Delivery' chart
  Relief valve set too low   Isolate system and check relief valve
  Relief valve held open   Clean and adjust valve
  Is oil returning to tank through a valve   Check valve operation
  Are valves leaking internally   Isolate valves and check operation
  Are there any external leaks   Tighten fittings and check components
  Normally closed valves stuck open   Clean and check system for contamination
  Is pump casing loose   Tighten case to correct torque
  Are any oil line pipes blocked   Clear blockage
  Incorrect assembly, broken drive coupling   Rectify
  Pump failure due to fatigue, contamination, pressure overload, etc.   Check pump and repair if possible, if not replace the pump

fault finder

EXCESSIVE SYSTEM NOISE
  cause   remedy
  Suction line or strainer blocked   Clean if possible or replace
  Aeration in suction line   Check/tighten pipe fittings
  Is pump casing loose   Tighten case to correct torque
  Restriction in pump passages   Check and clear obstruction
  Trapped air in fluid   Check components, tighten pipe fittings, bleed system if neccessary
  Breather blocked   Check and clear
  Pump speed excessive   Check speed with makers recommendations
  Incorrect viscosity of fluid   Check ambient conditions and design specification
  Misalignment of drive coupling   Re-align
  Filter too small   Check flow and pressure drop
  Faulty sticking valve   Isolate valve and check operation, replace or repair if possible
  Accumulator surges   Check accumulator precharge and correct functioning of loading valve
  Loose return pipes under tank lid   Check/tighten pipe fittings
  Pipework too small   Check with design specification
  Intermittent electrical supply   Check for correct supply

fault finder

CAUSES OF PUMP FAILURE
  cause   remedy
  Excessive pressure   Check relief valve setting
  Seizure due to lack of fluid   See 'Lack Of Delivery' chart
  Dirt wedged in clearances   Check filters and fluid condition
  Fracture of body due to pressure overload   Check relief valve setting
  Pressure surges   Check accumulator precharge, valve settings, load and circuit design
  Failure of control valves   Replace or repair valve
  Cavitation aeration   Check fluid lines to tank and suction pipe
  Dirt materials in fluid   Check filter and fluid condition
  Incorrect viscosity of fluid   Check temperature and viscosity with design specification
  Excessive pressure over-rated   Check relief valve setting
  Misalignment of drive coupling   Re-align
  Intensification fluctuating load causing reverse flow   Check load against design specification and correct functioning of valves

fault finder

IRREGULAR CYLINDER ACTION
  cause   remedy
  Is there air in the system   Check/tighten pipe fittings, bleed if neccessary
  Cylinder misalignment   Check and adjust
  Heavy load at slow feeds   Slides require lubrication
  Hose burst valve sticking   Clean, adjust or replace if neccessary
  Bent piston rod   Replace with new and reseal cylinder if neccesary
  Over centre load   Fit a load control valve
  Incorrect valve setting   Isolate valve and check operation, adjust if neccessary

fault finder

EXCESSIVE FLUID TEMPERATURE
  cause   remedy
  Incorrect viscosity of fluid   Replace with oil of correct viscosity
  High ambient temperature   Check fluid temperature around system
  Worn pump   Replace
  Failure of the cooler   Repair or replace
  Oil level in reservoir to low   Top up with correct filtered fluid
  Insufficient ventilation of power unit   Check position of power unit and move if neccessary
  Incorrect relief valve setting   Isolate valve and check operation, adjust if neccessary
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