32 - 1
Section E
Hydraulics
9803/6400
Section E
32 - 1
Issue 1
Control Valve JS200/JS240
Control Valve Trouble Shooting
Control Valve in General
Symptoms
Possible Causes
Countermeasures
Spool sticking
1. Oil temperature is abnormally high.
Remove the obstruction.
2. Hydraulic oil is dirty
Replace the hydraulic oil and clean the
circuit at the same time.
3. Port connector is tightened
Check the torque.
too much
4. Valve housing is deformed due to
Loosen the installation bolt and check.
Installation
5. Pressure is too high
Attach pressure gauge to pump port and
ram port and check the pressure.
6. Spool is bent
Replace the valve assembly.
7. Return spring is damaged
Replace the damaged parts.
8. Spring or cap is not on straight
Loosen the cap and after aligning, tighten.
9. Temperature inside valve is not even.
Warm up the circuit.
Spool does not stroke
1. Valve is clogged inside with dirt
Remove the dirt (flushing).
Load cannot be maintained
1. Oil leakage from the ram
Check the ram.
2. Oil is by-passing from the valve spool
Replace the valve assembly.
3. Oil leakage from the port relief valve
Remove the port relief from the housing
and clean the housing seat and relief
valve seat.
4. Oil leakage from the lock valve
Disassemble the lock valve and clean the
poppet seat and sleeve, plug seat.
If the seat is damaged, replace the
poppet, or lap the poppet and seat.
When the spool is selected from
1. Foreign matter in load check valve
Disassemble the check valve and clean.
neutral to raise position, the load
falls.
2. Check valve poppet or seat
Replace the poppet or lap the poppet and
damaged
seat part.
Summary of Contents for JS 200 Series
Page 57: ...9 1 Section 3 Routine Maintenance 9803 6400 Section 3 9 1 Issue 2 Component Location Diagram...
Page 113: ......
Page 137: ...5 3 Section C Electrics 9803 6400 Section C 5 3 Issue 2 Pump Control FLOW CHART...
Page 201: ...10 7 Section C Electrics 9803 6400 Section C 10 7 Issue 1 CAPs II Diagnostic system K C...
Page 215: ...Section E Section E Hydraulics 9803 6400 Issue 2 3 2 3 2 Schematics...
Page 217: ...Section E Section E 9803 6400 Issue 2 3 3 3 3 Hydraulics Schematics...
Page 218: ...3 5 Section E Hydraulics 9803 6400 Section E 3 5 Issue 1 Schematics Shuttle Block JS200 JS240...
Page 232: ...10 1 Section E Hydraulics 9803 6400 Section E 10 1 Issue 1 Hydraulic Pump JS200 JS240...
Page 233: ...10 2 Section E Hydraulics 9803 6400 Section E 10 2 Issue 1 Hydraulic Pump JS200 JS240...
Page 234: ...10 3 Section E Hydraulics 9803 6400 Section E 10 3 Issue 1 Hydraulic Pump JS200 JS240...
Page 263: ...30 2 Section E Hydraulics 9803 6400 Section E 30 2 Issue 1 Control Valve JS200 JS240...
Page 264: ...30 3 Section E Hydraulics 9803 6400 Section E 30 3 Issue 1 Control Valve JS200 JS240...
Page 265: ...30 4 Section E Hydraulics 9803 6400 Section E 30 4 Issue 1 Control Valve JS200 JS240...
Page 266: ...30 5 Section E Hydraulics 9803 6400 Section E 30 5 Issue 1 Control Valve JS200 JS240...
Page 267: ...30 6 Section E Hydraulics 9803 6400 Section E 30 6 Issue 1 Control Valve JS200 JS240...
Page 268: ...30 7 Section E Hydraulics 9803 6400 Section E 30 7 Issue 1 Control Valve JS200 JS240...
Page 327: ...51 12 Section E Hydraulics 9803 6400 Section E 51 12 Issue 1 Solenoid Valve 8 spool...
Page 328: ...55 1 Schematic Section E Hydraulics 9803 6400 Section E 55 1 Issue 1 Shuttle Valve...
Page 330: ...55 3 Schematic Section E Hydraulics 9803 6400 Section E 55 3 Issue 1 Cushion Valves...
Page 481: ...7 15 Section F Transmission 9803 6400 Section F 7 15 Issue 2 Motor...
Page 482: ...7 16 Section F Transmission 9803 6400 Section F 7 16 Issue 1 Motor...