Lovol FR18E-u - Overflow Valve; Working Mechanism

Troubleshooting
Troubleshooting 6-
4
Overflow Valve
Trouble Cause Measures
Under pressure Valve core is always open Disassemble and clean valve
Unstable pressure Damaged sealing ring for pilot
valve core
Replace sealing ring
Stuck valve core in pilot valve Disassemble and clean valve
Sudden rise/fall of pressure Abrasion caused by foreign matter;
contaminated system
Replace oil and worn parts
Lock nuts and adjust damaged
spring
Adjust pressure
Oil Leakage Sealing rin g has cracks, O - ring
wear
Replace worn parts
Stuck parts caused by foreign
matter
Disassemble, inspect and clean
parts
Working Mechanism
Trouble Cause Measures
Delayed action Under power of engine Adjust engine
Worn hydraulic pump Replace sealing ring
Faulty main overflow valve Adjust pressure or replace valve
Low hydraulic oil level Refill oil
Low viscosity of hydraulic oil Use oil with adequate viscosity
Lower performance of mechanism Bad hydraulic pump Replace hydraulic pump
Low hydraulic oil level Refill oil
Unable to work Lower pressure in overflow valve Adjust the pressure
Damagedsealingringfor
hydraulic oil c ylinder
Replace sealing ring
Damaged piston or rod of
hydraulic oil c ylinder
Replace sealing ring
Abnormal sound from joints Lack of g rease Refill oil
Worn connecting pin Replace liner or pin