© 2014-2015 Minuteman International, Inc.
Nautilus Hi-Dump Rider Scrubber/Sweeper #988752UM Rev. * 03/16
Page 86
PREVENTATIVE MAINTENANCE
HYDROBACK
UNIT
NEUTRAL SENSING
SWITCH
Fig. 1: Adjusting the Neutral Sensing Switch
CAM
MOUNTING
FASTENERS
SENSING SWITCHES
Adjusting the Neutral Sensing Switch
The Neutral Sensing Switch shuts off and raises the scrub
brushes and turns off the solution fl ow whenever the vehicle
is not in motion. When vehicle motion resumes the scrub
brushes automatically turn on and lower and the solution
fl ow is turned on.
The Neutral Sensing Switch is a normally open roller switch
located below and inboard of the pump centering unit
(Hydroback unit).
The switch is activated by a cam attached to the pump
centering arm.
Neutral Sensing Switch Adjustment:
Note:
Hydrostatic transmission neutral must be set before
performing this adjustment.
The cable should be adjusted so that there is little play in
the brake pedal but not so tight to cause the brakes to drag
when the brake pedal is released. (See Fig. 1 & 2)
1. Slightly loosen the neutral switch mounting fasteners so
that the switch can be repositioned by hand.
The adjustment can be monitored by listening to the sound
of the switch as it opens and closes.
2. Begin the adjustment by moving the switch body so that
the roller fi ts up into the half-round cut out in the cam.
This is the neutral position and the switch should be
open.
Ensure that the switch body is kept level during adjustment.
3. Adjust the switch body so that a very small amount of
pump arm motion will force the roller down and close the
switch.
This adjustment should be made while pushing the pump
arm slightly forward by hand (towards the front of the
vehicle) and then releasing the arm while listening for the
switch to close and open.