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Service Manual
Series T90 Axial Piston Pumps
Adjustments
©
Danfoss | March 2020
the pressure increases by an equal amount on the other gauge. Again note the angular position of
the wrench.
Neutral adjustment (HCEDC) (bottom view)
Solenoid shaft
Control spool
Feedback pin
Maximum
adjustment
less than 120°
P106 046E
Illustration shows how cam on adjusting pin rotates to adjust for neutral position after pump is re-
installed.
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 (M060). Torque to 10 Nm [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 1.5 bar [22 psi] or less is acceptable. Achieving zero differential is
usually not possible.
Verify neutral setting
1. If using a PWM signal to set mechanical neutral, check that servo pressure differential is less than 1.5
bar [22 psi].
2. To verify mechanical neutral, provide current to solenoid C1, or turn neutral adjusting screw, until the
servo pressure differential is 3 bar [43 psi]. The system pressure differential must be below 1.5 bar [22
psi]. Repeat test on solenoid C2 side.
3. The current required to set the servo pressure differential to 3 bar [43 psi] should be the same for
each solenoid.
4. If using neutral adjusting screw to set mechanical neutral, reset control neutral.
Servo Adjustment Side M4
1. Run prime mover at 1500 rpm.
2. If using a PWM signal to set mechanical neutral, start with the electronic control testing tool off (no
current/hydraulic pressure to either solenoid). Check to be sure the servo pressure differential is less
Adjusting
screw
(cam)
AX216086485386en-000101 | 35
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