191Service Manual – SC5000 34 - Scrub System, Cylindrical
Maintenance and Adjustment
Lift Actuator Limit Adjustment
The power module commands the actuator to raise
or lower, but the actuator itself determines when
it should stop moving. This is accomplished by two
cam lobes and two micro switches (limit switches).
The lower cam is not adjustable, so the lower limit
is adjusted by rotating the leadscrew nut. Then the
upper limit is adjusted by turning the cam lobe until
the actuator stops at the correct height.
To make the adjustment, you will need to manually
power/control the actuator. If you don’t have the
Actuator Test Kit described on page 200, you can
use the Deck Lift Output Test described on page
35. Just note that if you use the Output Test, you
may periodically cause a controller fault, and have to
reset the machine. For simplicity, this procedure is
written for the test kit method.
This procedure is typically performed as part of
replacing the actuator. If the actuator is not already removed from the machine, then remove it following the
procedure on page 184.
1. Connect the tester (A) to the positive and negative terminals of the battery. (The full 36 volts must be
used. Otherwise the motor speed will be too low and the results will be skewed.)
2. Using the adapter plug (B), connect the tester to the actuator.
3. While preventing the actuator leadnut (E) from turning, use the switch (C) to extend the actuator until
it stops.
4. Manually unscrew the leadnut (E) until there is at least 2.5” (60mm) distance between the leadnut and
housing (F&G).
• The actual distance isn’t import, so pick a number that is easy to work with.
• Record this distance.
CAUTION: If while retracting the actuator
with the “Output Test”, it
appears the leadnut is going
to crash into the actuator
housing, let go of the leadnut
and let it spin.
5. While preventing the actuator leadnut (E)
from turning, use the switch (C) to retract
the actuator until it stops.
6. Measure the distance between the actuator
gearbox at (G) and the top of the leadnut at (F), and subtract it from the previous distance. This is the
travel.
• The target travel is: 3.35 ± 0.09”
(85 ± 2 mm)
• If the target travel is off, adjust it as described below.
C
B1
B2
A
E
G
F
Extended — Retracted
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