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Fluid Power Information Center

Noise Control Chart for Hydraulic systems

EXCESSIVE NOISE


A
B
C
PUMP NOISY
MOTOR NOISY
RELIEF VALVE NOISY
Cavitation
Remedy:a
Coupling misaligned
Remedy:c
Setting to low too close to another valve setting
Remedy:d
Air in fluid
Remedy:b
Motor or coupling worn or damaged
Remedy:b
Worn poppet and seat
Remedy:e
Coupling Misaligned
Remedy:c
Pump worn or damaged
Remedy:e

Remedy:a
Replace dirty filters;wash strainers in solvent compatible with system fluid;clean or replace reservoir breather vent;change system fluid;change to proper pump drive motor speed;overhaul or replace supercharge pump;fluid may be too cold
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, bearings and couplings.
Remedy:d
Install pressure gauge and adjust to correct pressure
Remedy:e
Overhaul or replace
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