Manual Displacement Control
The following procedure requires
that steps be taken to disable the
machine in the event the pump
should go into stroke (raise drive
wheels off ground, etc.)
Remove the external control linkage from
the control handle.
Install two 300 PSI gauges into the
pressure gauge ports on either side of the
control (7/16-12 str. thd O-ring).
Start the prime mover and operate at
Remove the protective cap. Loosen the
spring housing locknut. Turn the spring
housing adjustment CW or CCW until the
two gauges read the same pressure. This
Turn the spring housing adjustment CW
until one of the gauges begins to raise
above the "base" pressure. Note the
amount of adjustment rotation.
Keeping track of the amount of rotation,
turn the adjustment CCW until the other
gauge begins to raise above the 'base"
Note the amount of rotation from the
previous adjustment position (amount
turned CCW in Step 6). Turn the
adjustment CW by one-half (1/2) that
Holding the adjustment in place, tighten
the spring housing locknut to 60-100 ft.
If the pump consistently returns to neutral.
after cycling the control several times.
the neutral adjustment is complete 10. If
the pump does not consistently return to
neutral, stop the prime mover and refer to
the procedure on the following page.
Stop the prime mover. install protective
cap. remove the two (2) pressure gauges
and install the pressure port plugs.
Torque to 10-20 ft. lbs.
Install and adjust, if necessary. the
external directional control linkage.