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 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.
Adjustment of the EDC is very sensitive. Be sure to hold the hex wrench steady while loosening the
locknut. Total adjustment is less than 120 degrees.
Control adjustment
Locknut
13 mm
Neutral adjusting screw
4 mm
P106 145E
10 N•m
[7 lbf•ft]
Servo pressure gauge port M5
Servo pressure gauge port M4
0 - 50 bar [0 - 1000 psi]
3/16 in
19 N•m [14 lbf•ft]
0 - 50 bar [0 - 1000 psi]
3/16 in
Servo pressure gauge port M4
0 - 50 bar [0 - 1000 psi]
3/16 in
Servo pressure gauge port M5
0 - 50 bar [0 - 1000 psi]
3/16 in
19 N•m [14 lbf•ft]
19 N•m [14 lbf•ft]
19 N•m [14 lbf•ft]
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 counterclockwise until the
pressure increases by an equal amount on the other gauge. Again note the angular position of the
wrench.
5. Rotate the neutral adjusting screw clockwise half the distance between the wrench positions noted
above. The gauges should read the same pressure, indicating that the control is in its neutral position.
6. Hold the neutral adjusting screw stationary and tighten the lock nut. Torque to 10 N•m [7 lbf•ft]. Do
not over torque the nut.
7. When the neutral position is set, stop the prime mover, remove the gauges, and install the gauge
port plugs. Reconnect the external control input.
A small pressure differential of 2.5 bar [36 psi] or less is acceptable. Zero differential is usually not
possible.
Service Manual
H1 45/53/60/68 Tandem Closed Circuit Axial Piston Pumps
Adjustments
©
Danfoss | June 2018
520L0928 | AX00000103en-US0303 | 41
