Manual Displacement Motor Control
The prime mover must not be operating during the initial
Remove the two (2) gauge port plugs and the
protective cap from the control. The spool lands on
the internal spool can be observed through the
exposed gauge ports. Remove the external control
linkage from the control handle.
Using a 1" wrench, loosen the spring housing
Turn the spring housing adjustment (CW and/or
CCW) until the areas between the spool lands and
the ports are equal (turning this adjustment moves
After adjusting the spool lands in the gauge ports,
turn the spring housing adjustment 900 + 150 in a
Holding the adjustment in place, torque the spring
housing locknut to 60-100 ft. lbs. Install two (2)
gauge port plugs and torque to 10-20 ft. lbs.
Start the prime mover and operate at normal speed.
When operating the machine, the motor should be
at full displacement when the control handle is
If the control functions satisfactorily, stop the prime
mover, install the protective cap and re-install
(adjust if necessary) the external control linkage.
If the control does not function properly, follow
Steps 12 through 17 from the procedure for Neutral
Adjustment, Variable Displacement Pump. Then
repeat Steps 1 through 6 of this procedure.
Conversion of a Pump Displacement Control for Motor
To convert a pump displacement control, which is properly
adjusted, for use on a motor; loosen the spring housing
locknut and turn the spring housing adjustment 900 + 150 in
a CW direction. Hold adjustment in place and torque
locknut to 60-100 ft. lbs.