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Common faults in hydraulic system? How to recognize and overcome?

1 . Pumps emit noise or excessive vibration

Air into the suction line of the pump to :

Go suck dirt into the filter - or replace toilet

Connection between the suction nozzle and filter loose - Tighten the

Low oil - level check oil level , add oil if necessary

Pump operation speed - check the parameters of the pump and motor

Using the wrong hydraulic oil standards

The volume is too large actuators lead to low oil level in oil tank

Dauqua viscosity leads to large holes - check oil viscosity suitable replacement dodau high - temperature cooling unit fitted with oil

Worn pump - repair or replacement , check the oil filter

Motor and pump assembly - coaxial not check dongtam

Coupling between motor and pump worn or loose - fitting tighten or replace if necessary couplings .

Overflow valve noise - adjusted test ( cothe adjusted too low or improper size)

Overflow valve work continuously pumped through the valve by the oil spill from the tank when the system is in the state do not cause loss of power , heat - replacement scheme open center or unload

2 . Pump output pressure is low or unstable

The air enters the system caused by :

The air - to - actuator replacement assorted phosphate .

- No air enters the pump - see point 1 .

- The air enters the connector hole or holes in the pipe - inspection of pipelines , repair or replace a new one.

Pump wear - repair or replacement .

Khongdung pump speed or improper size- checking specifications , selecting compatible pump and motor speed , flow and capacity .

Coupling between motor and pump worn or loose - fitting tighten or replace if necessary couplings .

Overflow valve adjustment - adjusted too low .

3 . Pump output pressure of zero

Motor no - boot Check motor power supply , check fuses , check wiring connection , reset the emergency stop button .

No oil in barrels of oil or low oil - level check .

Pump not turned the right way - Check direction of rotation specified by the manufacturer .

Coupling between motor and pump broken - fix checked or replaced .

Line pressure is broken or not connected - pipe test , finding large leaks .

4 . Hydraulic Cylinders not work :

Distribution valve - damaged electrical coil inspection , testing electrical systems , wiring connection .

Not provide enough pressure - pressure test system .

Pipeline trouble - spot checks twisted pipes , hollow and test connectors .

Broken cylinder - cylinder test condition , cylinder company has warped or scratched cylinder tube makes piston seals are worn lead to oil leakage through the piston .

Big load test - pressure system , calculations of piston diameter suitable for the load and pressure used .

System - faulty valve installed incorrectly , installed opposite one -way valve , pipe fitting incorrect .

5 . Hydraulic Cylinders go slow , or unstable vibration

The system can not go on the air .

Supply pressure is fluctuating .

Broken cylinder - cylinder test condition , cylinder company has warped or scratched cylinder tube makes piston seals are worn lead to oil leakage through the piston .

Broken or worn pump - repair or replacement .

Twisted pipe when moving cylinders .

Control valves broken toilet valve need repair or electrical coil can burn , check the power supply system .

Big load test - pressure system , calculations of piston diameter suitable for the load and pressure used .

6 . Hydraulic oil temperature is too high :

Barrels too small - sized check for container flow pump , suitable container volume greater than 3 times the pump flow .

Oil level too low - checking and adding oil .

Using non-standard oil , or oil is too dirty - toilet or replacing a new filter if necessary .

Oil Ministry heat - damaged repair or replace if necessary .

Overflow valve work continuously pumped through the valve by the oil spill from the tank when the system is not working causing power loss , heat - replacement scheme open center or unload .

Pump speed is not correct - check specifications of pump and motor .