54
- FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C
ELECTRICAL SYSTEM
BATTERY TESTING
A battery problem is usually recognized by the machine operator, as a decrease in the machine’s running time. This condition is usually caused
by one or more “dead cells” in the battery system- that is, one or more cells that is putting out less voltage than the other cells.
Note:
Always charge batteries before testing.
There are 2 ways to find a dead cell:
•
Use a hydrometer to check the specific gravity (or “state of charge”) of the fluid in each cell. A dead cell is one that reads 50 points (or more)
lower than the other cells.
•
Use a volt meter to check the voltage of each battery with the scrub and drive motors running. The battery with the dead cell will read 1 or
2 volts lower than the other batteries in the system.
If the batteries in the machine are more than 1 year old, it’s usually best to replace the whole set, rather than replacing just one battery.
ACTUATOR DRIVE NUT ADJUSTMENT
This manual section explains the steps for adjusting the drive nut (spring housing) setting for all the models’ scrub brush lift actuator motor.
Reference the chart below to find the IN & OUT dimensional specification for an actuator motor needing adjustment.
Part #
Actuator Motor
Spring Housing IN Position
Spring Housing OUT Position
Models**
56393303
Scrub Brush Lift
1-3/8" (35mm)*
5-3/8" (136mm)*
A
56393303
Scrub Brush Lift
2-1/4" (57mm)*
5-3/8" (136mm)*
B
56393303
Scrub Brush Lift
7/8" (22mm)*
4-3/8" (111mm)*
C
*The “Spring Housing IN/OUT Position” dimensions are measured when completely assembled. Reference points are the gear box step to the edge of the plastic
Spring Housing Guide
(C)
as shown in Figures 3 and 4.
**Model designation: (A)
=CMAX 28ST & BA 750ST,
(B)
= CMAX 34ST & BA 850ST,
(C)
=I-MAX 28C, I-MAX 32C & BA 750C
General Instructions for All Actuator Motors
1
See Figure 2. This shows the special actuator power cord adapter
(PN 56407502)
that is needed to connect the machine’s battery pack
and actuator motor for setting the drive nut limit settings.
Instructions for Scrub Brush Lift Actuator Drive Nut Adjustment
1
See Figure 3 and 4. On a new scrub lift actuator motor remove (spin-off) the Drive Nut
(A)
and first slide on the Spring Housing Guide
(C)
,
then install the short compression Spring
(D)
onto the actuator (lead screw) shaft. Next reinstall the plastic drive nut as shown (with the nut
pin pocket away from the motor). Then finish assembly of remaining parts (long compression spring, Spring Housing
(E)
and mounting
hardware).
2
Hold onto the spring housing assembly and press the rocker switch to run the drive motor and retract the spring housing towards the motor
housing (its IN limit).
3
Measure the position of the spring housing assembly on the actuator shaft. Manually turn the spring housing assembly to the appropriate
IN position shown in the chart above.
4
Hold the spring housing assembly then press the adapter cord rocker switch to run the drive motor to the OUT position (wait until the motor
stops).
5
Measure the position of the spring housing assembly on the shaft and compare the measurement with the OUT position shown in the chart.
6
When the measurement doesn’t match the dimension shown in the chart it is necessary to remove the Adjuster Cover
(B)
and adjust the
OUT position.
2
Open the machine battery compartment and dis-
connect the battery connector. The battery pack
is needed to power the lift actuator motor to
properly set the IN & OUT limit switches.
3
Connect the actuator motor to be tested to the
power cord adapter end. Then connect the alliga-
tor clips from the cord adapter (red clip to the
positive and black to negative) to battery connec-
tor or battery posts. The rocker switch is used to
change the motor rotation in setting the correct
drive nut dimension.
FIGURE 2
