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,
Connect the electrical leads from the machine
starter relay to the electrical connections on the
Start the prime mover and operate at normal
Note pressure reading on the gauges at this time.
The reading should be noted as base pressure.
Slowly move the control handle in one direction
while observing the pressure gauge and the
continuity checker. Continuity must be broken
before the gauge pressure increases more than 12
PSI from the base pressure obtained at neutral.
Slowly move the control handle in the opposite
direction. Again, continuity must be broken before
the gauge pressure increases more than 12 PSI
from base pressure.
Continuity must again be verified when the control
is returned to neutral.
If continuity is not broken at base pressure +0-12
PSI in either direction, stop the prime mover and
readjust the eccentric as described in step 5. If the
pressure difference is equal in each direction but
greater than 12 PSI loosen the switch locknut and
turn the switch in 1/16 of a turn to increase the
sensitivity. Retighten the locknut and recheck
pressure differences and continuity.
After verifying proper control and switch operation,
stop the prime mover. Remove the continuity
checker and pressure gauges. Install pressure port
plugs and torque to 10-20 ft. lbs. Install and
adjust, if necessary, the external control linkage.