Speed Sensor Adjustment - Danfoss T90 Series Service Manual

Service Manual
Series T90 Axial Piston Pumps
Adjustments

Speed sensor adjustment

42 | © Danfoss | March 2020
4. Rotate the adjusting screw clockwise half the distance between the locations noted above. The
gauges should read the same pressure (case pressure), indicating that the control is in its neutral
position.
5. Hold the neutral adjusting screw stationary. Tighten the neutral adjusting screw lock nut to 7 N•m [62
lbf•in] for the 6 mm screw or 13.5 N•m [120 lbf•in] for the 8 mm screw. Do not overtorque the nut.
6. Once the neutral position is set, stop the prime mover, remove the gauges, and install the gauge port
plugs. Reconnect the external control input.
When installing or adjusting the speed sensor on a pump, it must be set at a specific distance from the
speed ring on the unit's cylinder. To locate the position of the speed sensor on the unit or description see
the corresponding section.
1. Loosen the sensor lock nut with an 11/16 inch hex wrench.
2. Turn the sensor clockwise (CW) by hand until it contacts the speed ring.
3. Turn the sensor counterclockwise (CCW) 1/2 turn (180°) to establish the nominal gap of 0.71 mm
[0.028 inch].
4. Then turn the sensor clockwise (CW) until the wrench flats on sensor body are positioned at a 22°
angle to the pump shaft center line.
Most open-end wrenches have a 22° handle offset.
5. The final sensor position should be between 1/2 (180°) and 1/4 turn (90°) counterclockwise (CCW)
from the point where the sensor contacts the speed ring.
6. Hold sensor in position with a 1/2 inch hex wrench while tightening the lock nut to 13 N•m [10 lbf•ft].
Cross section view of speed sensor in variable pump
Gap
Speed sensor
Magnetic speed ring
Cylinder block
Positioning speed sensor relative to pump shaft
Shaft centerline
1/2 inch wrench flats
22° 22°
Speed sensor with Speed sensor with
packard connector
Shaft centerline
1/2 inch wrench flats
22°
22°
Speed sensor with Speed sensor with
packard connector
P104 152E
turck connector
turck connector
P104 155E
AX216086485386en-000101