65
4-4-2 Hydraulic pump
The fault phenomenon possible reason
Pump noise。
Oil level is low。
The oil is very thick (too viscous)
Pump inlet line is limited。
Worn parts in the pump.
Oil is very dirty。
Air leaked into the inlet line。
The oil temperature is too high。
Oil level is low。
The oil duct is restricted。
The oil is too thin。
There is a leak in the system。
There is too much wear and tear on the pump。
The system operates under too much pressure。
The pump shaft seal is leaking。
The shaft seal has worn away。
Internal wear of pump body。
Operating at too low an oil level in the tank can
cause suction on the seals。
During installation, seal the shoulder cut in the
pump or keyway。
Seal lips are dry and hardened by heat。
The pump is unable to move fluid。
The oil content in the tank is low。
Pump inlet line is limited。
There e is a leak in the pump inlet line. Loose
bolts.
Defects in inlet line of bay。
The viscosity of the oil is wrong。
There is too much wear and tear on the pump。
Pump shaft failure
The pump bolt does not have the correct torque。
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