Troubleshooting; Battery Testing; Removal And Installation; Batteries - Nilfisk-ALTO Scrubtec R 6-71C 28C Service Manual

Service Manual – Focus II / Scrubtec R6 Rider Autoscrubber

Troubleshooting

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 one or two batteries. Mixing old and new batteries can result in over-charging problems.

Removal and Installation

Batteries

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 disconnect
the main battery connector (1).
2. Disconnect the vacuum motor connector and remove the
Recovery Tank described on page 52.
3. Remove the cables from the batteries, and remove the
batteries. Make note of the battery polarity and cable
locations.
4. 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.
Caution!
If you change the type of batteries (Wet VS Gel), you
must change the charging profile used by
the battery charger to be compatible with
the new type of batteries.
5. Put a rubber boot over each end of the battery cables.
6. Connect the battery cables.
• All cables are connected positive-to-negative for a
series connection between all 4 batteries.
Electrical System
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