jcb JS200 Service Manual page 254

Section E
22 - 1
Regulator Trouble Shooting
Engine Overloads
Put a load on each pump to determine if the front or rear pump is malfunctioning. If both pumps are abnormal, check 1 and 2.
If only one pump is abnormal, begin with 3.
1. Check to see if the power shift command current value I is normal or not.
2. Power shift pressure is low
3. Disassemble and clean the compensatory piston, compensatory rod.
4. Disassemble and clean the pin (898).
Maximum Flow Rate Is Not Achieved
1. Confirm that the pilot pressure Pi is normal or not.
2. Disassemble and clean the pilot piston.
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3. Disassemble and clean the piston (648).
4. Disassemble and clean the spool.
Note: If any of the parts shows wear or scratches, replace it.
9803/6400
Hydraulics
Regulator JS200. JS240
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Check fluctuation of solenoid current.
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Renew the proportional pressure reducing valve.
Section E
22 - 1
Issue 2*