NPK DG16 - Rotation Pressure Checking Procedure; Troubleshooting Chart for Rotation

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TROUBLESHOOTING
TROUBLESHOOTING FOR SLOW ROTATION SPEED
ROTATION
The rotation speed is a direct result of the amount of flow (gpm/lpm) supplied by the
rotation circuit of the carrier or NPK hydraulic kit. The chart on the following page lists
the approximate flow required.
The relief listed on the chart is only necessary to protect the rotation supply
componentry.
MODEL
OIL FLOW
PRESSURE
ROTATION
ROTATION
gpm
(lpm)
psi
(bar)
DG16
5 - 8
(20 - 30)
1,450 - 2,030
(100 - 140)
DG20
9 - 16
(35 - 60)
1,450 - 2,030
(100 - 140)
DG30
9 - 16
(35 - 60)
1,450 - 2,030
(100 - 140)
DG40
9 - 16
(35 - 60)
1,450 - 2,030
(100 - 140)
Adjust the rotation flow so that it is within the guidelines shown for the model being
tested.
Flows are checked at a normal operating pressure of 1,000 psi (70 bar). Cross port
relief valves rated at 2,500 psi (172 bar) are included in the hydraulic motor.
Excessive rotation speed will result in damage to the hydraulic motor, gearbox, or
bearing.
MEASURING ROTATION PRESSURES
Tools and Equipment Required
Qty. 1 -Pressure gauge: 0 – 3,000 psi (0 – 210 bar)
Qty. 1 -Gauge adapter fitting: 1/4” npt female x #6 JIC male
(NPK part number K023-6690)
Qty. 2 -Swivel run tee fittings: #8 JIC
Qty. 2 -Test hoses: rated for 3,000 psi (210 bar); #8 JIC female swivel one end and #6
JIC female swivel the other end.