NPK DG16 - Adjustment of Rotation Speed

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TROUBLESHOOTING
TROUBLESHOOTING FOR SLOW ROTATION SPEED
ROTATION PRESSURE CHECKING PROCEDURE
1. Install gauges in the rotation circuit lines.
2. Position the Demo Grab so that it will not rotate.
3. Attempt to rotate the unit in both directions. Each gauge should read 2,000 psi
(138 bar).
TROUBLESHOOTING CHART FOR ROTATION
PROBLEM
CAUSE
CHECK
REMEDY
Unit will not rotate
Low or no flow.
Check hydraulic
flow. Reference
hydraulic flow chart
above.
Adjust the carrier's
flow to the
attachment.
Pressure setting of
cross port relief
valves (ma4).
Check cross port
relief valve settings.
See procedure
above.
Adjust the cross port
relief valves on the
rotation holding
valve.
Replace cross port
relief valves.
Broken pinion gear
or hydraulic motor
shaft.
Check pinion gear
and hydraulic motor
shaft.
Replace hydraulic
motor or pinion gear.
Unit will not hold
position.
Pressure setting of
cross port relief
valves.
Check cross port
relief valve settings.
See procedure
above.
Adjust the cross port
relief valves on the
rotation holding
valve.
Replace cross port
relief valves.
Broken pinion gear
or hydraulic motor
shaft.
Check pinion gear
and hydraulic motor
shaft.
Replace hydraulic
motor or pinion gear.