NPK M20C, Instruction Manual, Page: 143 / 152

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143
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TROUBLESHOOTING
JAW DRIFT
 Some jaw drift may be experienced depending on the Material Processor’s
position.
 Acceptable drift may occur over a number of minutes.
 Rapid drift may indicate a problem with the Material Processor’s cylinder,
booster, or swivel manifold. The problem could also be in the carrier’s hydraulic
circuit.
TO DETERMINE IF THE JAW DRIFT IS WITH THE MATERIAL
PROCESSOR OR THE CARRIER
1. Remove the hoses (m3 and m4) from the joint fittings on the outside of the Material
Processor’s frame and close the shut-off valves on the carrier.
2. Cap (AR) the joint fittings and plug (AS) the hoses. Fitting size is 20 JIC.
 IF THE JAW DRIFTS: The problem is in the cylinder, intensifier pilot checks or
internal leakage in the swivel manifold of the Material Processor (GX).
 IF NO DRIFT OCCURS: The problem is in the carrier’s main control valve.
Contact your carrier dealer.
NOTE: Drift due to the main control valve internal leakage may be inherent to
the carrier and not repairable.