Stoning the Commutator
1. If the commutator has grooves or other damage,
the armature must be removed so the commuta-
tor can be repaired. Motors are normally repaired
by service persons that have the special equip-
ment required. Connect battery so the motor can
be operated. See Figure 6. The battery must be
removed for access to the motor. Use a jumper
cable to connect battery to lift truck. Raise drive
wheels. See How to Raise the Drive Wheels in
the Operating Manual or the YRM section Peri-
odic Maintenance for your lift truck.
2. Close seat switch and key switch so motor will op-
erate.
NOTE: A brush seater stone can also be fastened to
a wood stick with glue as shown in Figure 6. This ar-
rangement makes it easier to apply a brush seater
stone in small spaces.
3. Operate motor so commutator rotates slowly. Ap-
ply brush seater stone to moving commutator with
light pressure. Move brush seater stone backward
and forward across surface of commutator until
marks on commutator are removed. Apply brush
seater stone to commutator before each set of
brushes so the brush seater particles have an
even distribution.
CAUTION
Do not permit the brush seater stone to stay in
contact with the commutator too long and cause
more wear than necessary.
4. Turn key switch to OFF position and disconnect
battery. Check all brush contact surfaces. The
brushes fit correctly when 85 percent of the brush
contact surface touches the commutator. This
stoning procedure normally requires approxi-
mately 15 to 45 minutes.
5. When the brushes have the correct contact sur-
face with the commutator, use a vacuum cleaner
to remove abrasive dust from commutator area
and motor.
6. When the installation and checks are complete,
install brush cover. Make sure wires to brushes
do not touch any part of motor case and cause a
short circuit.
0620 YRM 0294 Stoning the Commutator
13
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