Group 16, Electrical Motors
SM 765, Nov ’06 Drive Motor Overhaul • 16-2-3
Replacing Encoder Bearing
In general the encoder bearing should be replaced every
time the motor is disassembled.
To replace the encoder bearing:
• Turn key OFF.
• Set park brake.
• Disconnect battery.
• Remove the drive motor (see page 1 of this sec-
tion).
• Remove motor thru bolts.
• The silicone sealing the cables into the end frame
will need to be loosened to allow removal of the
end frame.
• Remove the non-drive end housing from motor.
• Remove rotor from motor.
• Use a gear puller to remove encoder bearing from
the rotor.
• Press new encoder bearing on to rotor at the inner
ring with a steady pressure. The inner ring of the
bearing must to be pressed against the shaft shoul-
der.
Motor Reassembly
N
TE
The encoder bearing is very sensitive to static
electricity. If you are going to be working on
the encoder bearing you should have a
ground strap on to insure that the encoder
bearing does not get damaged.
• Insure that the encoder cables are installed cor-
rectly and do not get pinched or touch the rotor.
• Install the end housing carefully onto the encoder
bearing and press it on with a steady pressure. The
lead from the bearing must located in the notch in
the housing frame.
• Install the rotor into the stator housing.
• Tie strap the encoder bearing lead to one of the
motor leads to prevent it from being pulled and
contacting the rotor.
• Install the drive end onto the motor making sure
that the terminal block mounting bracket is aligned
with the slots in both end frames.
• Install the motor through bolts and tighten.
• Fill the void around the drive motor leads with Sil-
icone # 1758629.
• Reinstall the motor into the truck.
Notch for Lead
Terminal Block
Mounting Bracket
Thermal Sensor Lead
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