Optional speed sensor
When installing or adjusting the speed sensor on a pump, you must set it to a specific distance from the
speed ring on the cylinder block.
Removal
1. Loosen the lock nut using a 1-1/16 in hex wrench.
2. Unthread the speed sensor (N002) from the pump housing. Remove and discard the O-ring (N002A).
Speed sensor replacement
P108 081E
1-1/16 in
13 N•m
[10 lbf•ft]
11/16 in
37 N•m
[27 lbf•ft]
N002 O-ring plug
N002
N002A
N002A
Reassembly
1. Always install a new O-ring before reinstalling the sensor.
2. Reinstall the speed sensor (with lock nut and O-ring) into the housing. 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].
Cross section view of speed sensor in variable pump
Magnetic speed ring
Speed sensor
Gap
P104 152E
Cylinder block
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Minor Repair
520L0638 • Rev 0300 • July 2015 39
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