TSE DP20-4H, Owner'S Manual

Page: 75 / 242

Displacement limiter adjustment data
Displacement Locknut wrench size and torque Adjusting screw
size
Approximate displacement change
per revolution of adjusting screw
28 13 mm 23 N•m [17 lbf•ft] 4 mm internal hex 2.9 cm
3
[0.18 in
3
]
32 13 mm 23 N•m [17 lbf•ft] 4 mm internal hex 3.3 cm
3
[0.20 in
3
]
38 13 mm 23 N•m [17 lbf•ft] 4 mm internal hex 3.56 cm
3
[0.22 in
3
]
45 13 mm 23 N•m [17 lbf•ft] 4 mm internal hex 4.22 cm
3
[0.26 in
3
]
Control Neutral Adjustment
All functions of the control are preset at the factory. Adjust the pump to neutral with the pump running
on a test stand or on the vehicle/machine with the prime mover operating. If adjustment fails to give
satisfactory results, you may need to replace the control or coils. See
Minor repair for details.
W
Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable/disconnect the mechanism
while servicing.
1. Install a 50 bar [1000 psi] gauge in each of the two servo gauge ports (M4 and M5). Disconnect the
external control input (electrical/hydraulic connections) from the control. Start the prime mover and
operate at normal speed.
2. Use a 4mm internal hex wrench to hold the neutral adjusting screw stationary while loosening the
locknut with a 13mm wrench.
3. Observe pressure gauges. If necessary, turn adjusting screw to reduce any pressure differential.
A small pressure differential of 1.5 bar [22 psi] or less is acceptable. Achieving zero differential is
usually not possible.
Adjustment of the EDC/HDC is very sensitive. Be sure to hold the hex wrench steady while loosening
the locknut. Total adjustment is less than 120 degrees.
Control adjustment
P109037
Locknut
Adjusting screw
Servo gauge port M4
Servo gauge port M5
4. Rotate the neutral adjusting screw clockwise until the pressure increases on the gauge. Note the
angular position of the wrench. Then rotate the neutral adjusting screw counter clockwise until the
Service Manual
MP1
Adjustments
© Danfoss | July 2017 AX00000244en-US0103 | 41