Columbia ParCar Expediter EX21-24A, Service Manual, Page: 85 / 94

Section 10 – Traction Drive System
A good planned maintenance program will save many hours of
future down time and prevent catastrophic failure of major
motor components. Maintenance schedules consist of periodic
routine inspections of motors, battery and wiring circuitry.
Since operation of equipment varies widely, the following
recommendations are suggested for periodic maintenance
inspection:
Normal service
– 8 hours per day operation
▪
Routine inspection every 1,000 hours
Severe service
– 24 hours of daily operation
▪
Routine inspection every 500 hours
NOTICE: Severe service would include; Dusty or sandy
locations such as cement plant, lumber or fl our mills,
coal dust or stone crushing areas. High temperature
areas such as steel mills, foundries, etc. Sudden
temperature changes such as continuous indoor-
outdoor movement, as in refrigeration plants.
EXTERNAL INSPECTION
1. Check for clean, tight, terminal studs and mounting bolts.
2. Internal and external spline drives, between motor and final
drive axle, must be periodically lubricated with a thin layer
of quality, anti-seize compound.
3. Check for any signs of oil leaks from final drive axle, which
might cause oil to enter traction motor.
INTERNAL INSPECTION
The brush and commutator inspection is the most important
part of motor maintenance. By recognizing undesirable
commutator and/or brush conditions, internal repairs can be
performed before major component damage or failure occurs.
Brush and commutator inspection can be accomplished by
removing the motor head. The brushes and commutator should
be inspected for even wear and good commutation.
Good commutation will be indicated by a dark brownish,
polished commutator and an evenly polished brush wearing
surface. If the commutator appears rough, pitted, scored or has
signs of burning or heavy arcing between the commutator bars,
the motor should be removed for servicing.
REMOVA
L
NOTICE: Studs and jam nuts on the electric motor can
be damaged when attaching or removing electrical
leads. Hold a thin open end wrench on the electrical
stud connector jam nut while loosening or tightening
attaching nuts.
1. Mark traction motor cables (if not already marked), with
motor terminal identification Figure 10-1.
2. F1 and F2 terminals are 1/4-20, A1 and A2 terminals are
5/16-18. Hold terminal jam nut with a thin open end wrench
when loosening and removing hex nuts, lock washers and
flat washers securing electrical cables to traction motor.
Figure 10-1
3. Carefully support motor to prevent it from falling.
4. See Figure 10-
2. Loosen and remove the three 1/4” bolts,
lock washers and flat washers securing motor to rear
axle/differential housing.
5. Pull motor away from rear axle housing and clear of the
vehicle.
Traction motor is heavy and awkward to move. Get help
stabilizing and removal to prevent possible personal
injury.
Figure 10 - 2