2007-2008 XRT 800, 810 and 850 Maintenance and Service Manual
Page 27-1
27
SECTION 27 – MOTOR (MODEL EJ4-4001)
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DANGER
• See General Warning on page 1-1.
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WARNING
• See General Warning on page 1-1.
GENERAL INFORMATION
The electric vehicle is equipped with a 48-volt DC, shunt-wound, reversible traction motor. The shunt-wound
motor is designed for use on electric vehicles only. It is recommended that motors requiring major repair be
sent to a qualified motor repair shop; however, there are many relatively simple tasks that can be performed
by a technician with general knowledge and experience in electric motor repair.
MOTOR IDENTIFICATION
There are two types of motors used in the electric vehicle: Model 5BC59JBS6390 (gray housing), and EJ4-
4001 (black housing). Do not attempt to service a motor that has not been properly identified. If the motor can-
not be properly identified, contact your local dealer or distributor.
EXTERNAL MOTOR TESTING
The following tests can be performed without disassembling the motor using a multimeter or continuity tester.
NOTE:
Tag the motor wires for identification before disconnecting.
TEST PROCEDURE 1 – INTERNAL SHORT CIRCUITS
See General Warning on page 1-1.
1. Disconnect the battery cables as instructed.
See WARNING “To avoid unintentionally starting...” in
General Warning on page 1-2.
2. Disconnect wires from terminals on motor using two wrenches to prevent posts from turning.
3. With a multimeter set to 200 ohms, place black (–) probe on motor housing. Scratch through paint to
ensure a good connection. Place red (+) probe on A1, A2, S1, and S2 terminals respectively. Multimeter
should indicate no continuity. If readings are incorrect, motor will need to be removed from the vehicle
and repaired by a qualified technician.
See Motor Removal on page 27-2.
3.1. An incorrect reading from the A1 or A2 terminal indicates three possible problems: a grounded A1
or A2 terminal, a grounded wire in the brush area, or a grounded armature/commutator. An incor-
rect reading for the S1 or S2 terminal indicates a possible grounded S1 or S2 terminal or field coil.
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