Electric Motors; Theory Of Operation; Maintenance - prime mover smx45 Master Service Manual

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Electric Motors

Electric motors provide power to the transmission and
hydraulic systems. Motor speed and direction are controlled
by the transistor controller or contactor with inputs from the
operator controls.

1. Theory of Operation

The lift pump motor assembly consists of the pump motor,
pump assembly and lift valve assembly. The pump motor and
pump are an integrated unit. The drive unit assembly consists
of the electromagnetic brake assembly, drive motor,
transmission assembly and drive wheel. The drive motor is
part of the drive unit. The steering bearing is mounted on top
of the drive unit assembly.

2. Maintenance

A routine maintenance schedule with recorded findings is the
best way to reduce costly shut-downs and repair of
equipment during operating hours. The goal of any
maintenance program, long-life and trouble-free operation, is
related to time spent making inspections and correcting minor
problems as they occur.
Inspect the motor more frequently when working in an
abnormally severe or corrosive environment or if in a rigorous
duty cycle. Set up and maintain a strict inspection schedule to
obtain the maximum efficiency from the electrical equipment.
Operating environments of truck motors varies widely.
The following recommendations should be applied as actual
conditions dictate:
Normal Service:
Severe Service:
Extreme Service:
Master Service Manual 2006-08-04
F-code Section
PT S1.0
Version no T-code
001 SMX
Basically an eight hour day of indoor
material handling.
Extended operating hours, or constant
usage.
Chemical processing
Cold storage operation
Processing plants (poultry, meat)
C-code
1700
Electric Motors
87