Verify swashplate neutral adjustment (see Swashplate neutral adjustment on page 23) before performing
control neutral adjustment.
Measured data
•
Servo pressure at M4
•
Servo pressure at M5
•
Pressure differential between M4 and M5 (optional)
Procedure
1. Attach 20 bar [300 psi] gauge to each servo gage port.
2. Using a 3/8 hex wrench, loosen screw (1210) to allow the neutral adjustment bracket to move, but
not freely.
3. Start prime mover and slowly accelerate to normal operating RPM.
4. Using your hand, press neutral adjustment bracket towards the pump housing, and rotate
adjustment bracket until both servo gages read equal pressures. Rotate adjustment bracket until one
of the servo pressure gages indicates an increase in pressure. Rotate adjustment bracket in opposite
direction until the other servo pressure gage indicates an increase in pressure. Rotate neutral bracket
until it is half way between the two positions.
5. While holding the neutral adjustment bracket in place, use a 3/8 hex wrench to tighten screw (1210).
Torque to 14 Nm [10 ft•lb].
Manual displacement control bracket adjustment
Electronic Displacement Control/Hydraulic Displacement Control Neutral Adjustment
With the pump properly plumbed, primed and mounted on a vehicle or test stand, use the following
procedure to adjust the pump displacement control to neutral position. If pump is on a vehicle, block the
wheels to prevent movement.
Verify swashplate neutral adjustment (see Swashplate neutral adjustment on page 23) before performing
control neutral adjustment.
Service Manual
Series 40 M46 Tandem Variable Pumps
Adjustments
©
Danfoss | September 2017 11029852 | AX00000030en-US0202 | 25
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