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Fluid Power Information Center

Excessive Heat Chart for Hydraulic systems

EXCESSIVE HEAT

A
B
C
D
PUMP HEATED
MOTOR HEATED
RELIEF VALVE HEATED
FLUID HEATED
Remedy:SEE COLUMN D
Fluid heated
Remedy:SEE COLUMN D
Fliud heated
Remedy:SEE COLUMN D
System pressure too high
Remedy: d
Cavitation
Remedy: a
Relief or unloading valve set too high
Remedy: d
Valve setting incorrect
Remedy: d
Unloading valve set too high
Remedy: d
Air in fluid
Remedy: b
Excessive load
Remedy: c
Worn or damaged valve
Remedy: e
Fluid dirty or low supply
Remedy: f
Relief or unloading valve set too high
Remedy: d
Worn or damaged motor
Remedy: e
Incorrect fluid viscosity
Remedy: f
Excessive load
Remedy: c
Faulty fluid cooling system
Remedy: g
Worn or damaged pump
Remedy: e
Worn pump, valve, motor, cylinder or other component
Remedy: e

Remedy:a
Replace dirty filters; clean clogged inlet line; clean or replace reservoir breather vent; change system fluid; change to proper pump drive motor speed; overhaul or replace supercharge pump.
Remedy:b
Tighten leaking connections;fill reservoir to proper level(with rare exception all return lines should be below level in reservoir);bleed air from system; replace pump shaft seal(and shaft if worn at seal journal).
Remedy:c
Align unit and check condition of seals and bearings; locate and correct mechanical binding; check for work load in excess of circuit design.
Remedy:d
Install pressure gauge and adjust to correct pressure(keep at least 125 PSI differecnce between valve settings).
Remedy:e
Overhaul or replace.
Remedy:f
Change filters and also system fluid if improper viscosity; fill reservoir to proper level.
Remedy:g
Clean cooler and/or cooler strainer; replace cooler control valve; repair or replace cooler.
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