Hydraulic System - jcb JS300 Service Manual

Symptoms
The hydraulic system is not
working well or not at all
E-239

Hydraulic System

Table 4.
Possible Causes
1. Pump problem.
2.Foreign matter clogging inside the relief
valve.
3. Relief valve trouble.
4. Ram trouble.
5. Load is too heavy.
6. Crack in the valve.
7. Spool does not stroke fully.
8. Oil level too low.
9. Filters inside circuit are clogged.
10. Hose runs are kinked.
9813/5100-1
Section E - Hydraulics
Hydraulic System Fault Finding
Hydraulic System
Countermeasures
Check the pressure or replace the pump.
Disassemble the relief valve and clean.
Check according to the maintenance
procedures.
Repair or replace.
Check the circuit pressure.
Replace the valve assembly.
Check the spool movement and operation
link.
Replenish hydraulic oil.
Clean filter or replace.
Check the hoses.
E-239