jcb JS200 Service Manual page 105
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Also See for JS200:
- Operator's manual (31 pages) ,
- Service manual (51 pages) ,
- Service manual (51 pages)
Table of Contents
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Section B
12 - 10
System Diagnosis (cont'd)
Low R-134a Charge
Gauge Readings:
Low Side Gauge - Low.
High Side Gauge - Low.
Other symptoms:
Sight Glass - Bubbles continuously visible.
Diagnosis:
System slightly low on R-134a, due to leak or
incorrect charge.
Correction:
1. Leak test system.
2. Evacuate A/C system.
3. Repair system leaks.
4. Charge system with R-134a.
5. Operate system and check performance.
Poor Refrigerant Circulation
Gauge Readings:
Low Side Gauge - Zero to negative.
High Side Gauge - Low.
Other symptoms:
Receiver-Drier - Frost on tubes from receiver-drier to
evaporator unit.
Diagnosis:
Refrigerant flow obstructed by dirt, receiver-drier
clogged.
Correction:
1. Evacuate A/C system.
2. Replace receiver-drier.
3. Charge system with R-134a.
4. Operate system and check performance.
9803/6400
Body & Framework
Air Conditioning
LOW SIDE (RED)
LOW SIDE - 0.76 bar (0.77 kgf/cm
HIGH SIDE - 8.3 bar (8.5 kgf/cm
LOW SIDE (RED)
Zero to negative
LOW SIDE - -1.0 bar (-1.1 kgf/cm
HIGH SIDE - 5.4 bar (5.5 kgf/cm
HIGH SIDE (BLUE)
Low
2
)(11 lbf/in
2
)(121 lbf/in
HIGH SIDE (BLUE)
2
)(-15 lbf/in
2
)(78 lbf/in
Section B
12 - 10
Low
2
)
2
)
Low
2
)
2
)
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.
This answer is automatically generated