75
- FORM NO. 56043115 - 34 RST
Electrical System
Removal and Installation
Caution!
• Use extreme caution when working with batteries. Sulfuric acid in batteries can cause severe injury if
allowed to contact the skin or eyes.
• Explosive hydrogen gas is vented from the batteries through openings in the battery caps. Do not smoke
while servicing the batteries.
• Remove all jewelry. Wear safety glasses, rubber gloves and a rubber apron
• Do not allow tools to touch more than one battery terminal at a time
• Electrical components in this machine can be severely damaged if the batteries are not installed and
connected properly.
1. Turn the Key Switch to the off position and open the recovery
tank.
2.
Remove the cables from the batteries, and remove the
batteries. Make note of the battery polarity and cable locations.
3.
Install the new batteries into the compartment. Note the
orientation of the batteries shown to the right. Not all of the
batteries are oriented the same way.
4. Put a rubber boot over each end of the battery cables.
5. Connect the battery cables.
• There are 3 short cables
(S)
, 2 long cables
(L)
, and the main
positive
(Bat+)
and negative
(Bat-)
cables leading to the
machine.
• All cables are connected positive-to-negative for a series
connection between all 6 batteries.
• Position the cables so the battery caps can be easily removed
for battery service.
• Take care to not over torque the cable connector, as this may damage the battery post.
6. Coat the terminals with spray-on battery terminal coating (available at most auto parts stores).
7. Put one of the black rubber boots over each of the terminals and connect the Battery Pack Connector
(14
or
18)
.
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.
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. Look for a battery with a voltage that is 1 or 2 volts less
than the other batteries. Check under the following conditions:
•
With the batteries fully charged,
•
With the scrub and drive motors running,
•
With the batteries discharged, but still above the voltage cutoff threshold.
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.
BAT+
BAT-
+
−
+
−
+
−
+
−
+
−
+
−
L
S
S
S
L