PowerBoss Nautilus Hi-Dump PB45HDSL, Service Booklet

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The rear bumper and squeegee can be raised separately from the debris hopper. This is particularly
useful when inspecting or performing maintenance on the rear squeegee. If desired both of the lift arm
assemblies can be raised and lowered at the same time.
The outer (bumper) lift arm assembly is equipped with a solenoid-operated latch located in the lower
end of the right lift arm. This latch insures that the lift arms stay in place while traveling and during
scrubbing operations.
The bumper lift arm assembly is also equipped with a tilt switch located at the lower end of the right lift
arm inboard of the solenoid-operated latch. If the operator raises and then lowers the hopper without
opening the dump door, the tilt switch will open the hopper dump door automatically when the hopper
is within 15 degrees of fully lowered.
An “interference” switch is located on the lower end of the inner (hopper) lift arms. This switch
prevents the hopper lift arms from being powered into the bumper lift arms when the bumper lift arms
are not fully raised.
The left switch (bumper raise, hold, and lower switch) and the center switch (hopper raise, hold, and
lower switch) are three-position, spring-to-center, rocker switches. Each has a front “raise” position,
center “hold” position, and a rear “lower” position.
The right switch (hopper dump door switch) is a two-position intermittent rocker switch. It has a front
“door open” position and a rear “off” position. The switch is spring loaded to the off position. There is
no “door closed” position.
Operating the bumper lift:
Pressing and holding the front of the left switch (bumper switch) causes the solenoid-operated latch to
release the bumper lift arms and raises the bumper lift arms.
The bumper can be raised to its full height or it can be stopped at any desired height by releasing the
switch. A pilot-operated check valve holds the lift arm assembly in place when raised.
Pressing and holding the rear of the left switch lowers the bumper lift arms.
Operating the hopper lift:
Pressing and holding the front of the center switch (hopper raise and lower switch) raises the hopper
after a four second delay. During this delay the hopper dump door closes. This is automatic and
prevents debris from falling out when the hopper is raised.
The hopper can be raised to its full height or it can be stopped at any desired height by releasing the
switch. A pilot-operated check valve holds the hopper in place when raised.
Pressing and holding the rear of the center switch lowers the hopper lift arm assembly.
Opening the hopper door:
Pressing and holding the front of the right switch (hopper door open switch) for three seconds opens
the hopper dump door. This switch is used only for emptying the contents of the hopper. The
remaining hopper dump door operation is automatic. The dump door is always automatically opened