Speed Travel And Max Flow Cut - jcb JS200 Service Manual
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Also See for JS200:
- Operator's manual (31 pages) ,
- Service manual (51 pages) ,
- Operator's manual (31 pages)
Table of Contents
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Section C
5 - 10
3-Speed Travel and Max. Flow (Q) Cut
Travelling at middle speed (always middle speed as
1.
the key is switched ON).
Even though travel and upper pressure switches are ON,
there is no output to solenoid valves A and B.
Travel motor swash plate is in low speed position.
Pump: Standard flow.
2.
Travelling at high speed (pressing IN5 switch once
when travelling at middle speed, shifts to high speed.)
The travel motor switching solenoid valve turns ON and
swash plate of the motor shifts to high speed position.
3.
Travelling at low speed (pressing IN5 switch once
when travelling at high speed, shifts to low speed.)
When a travel pressure switch is switched, the max. flow
cut solenoid valve turns ON and flow (Q) is cut. Swash
plate of the motor shifts to low speed position.
Pump flow is cut.
When upper pressure switch is turned on, max. flow rate
cut solenoid valve is de-energised to prevent excavator
circuits being slowed
9803/6400
Electrics
Pump Control
A
A
B
B
1.
At middle speed travel
Travel motor swash plate: low side
Pump: Standard
2.
At high speed travel
Travel motor swash plate: Upper side
3.
At low speed travel
Pump: Q cut
Same as in S mode.
Section C
5 - 10
Issue 1
- Quick Links:
- Section E - Hydraulics
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Table of Contents
Troubleshooting
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Questions and answers
Trouble shoot no swing
To troubleshoot a no swing issue on a JCB JS200, follow these steps:
1. Check if engine starts and operates normally:
- If the engine does not start and “Electric system abnormality” is indicated, refer to Trouble No. 10.
- If the engine starts but rotation does not change with throttle, controlling engine rotation may not be possible.
2. Check hydraulic system components:
- Inspect for sufficient hydraulic oil amount; refill if low.
- Check the hydraulic oil strainer for contamination; clean or drain as needed.
- Ensure oil levels in reduction gears are adequate; refill if needed.
3. Check for mechanical or control blockages:
- Inspect the remote control valve for:
- Low secondary pressure due to low primary pressure—apply correct primary pressure.
- Damaged spring—replace the spring.
- Excessive clearance between spools and casing—replace the remote control valve.
4. Inspect motor operation:
- If motor does not run or rotates slowly:
- Check for pressurized oil; inspect pilot piping for damage.
- Remove foreign matter between plunger and body, orifice, or dumper piston and cap.
- Repair or replace damaged parts as needed.
5. Check electrical and wiring connections:
- Inspect battery terminals and alternator wiring for looseness or corrosion; tighten or replace as needed.
These checks cover both hydraulic and electrical causes that could lead to a no swing condition.
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