5-2
2. ELECTRICAL SYSTEM
MOTOR
When the motor brush has been worn to approx. one half(16mm) that of a new brush, replace it
with a new one. At the same time, adjust the brush, as the spring pressure retaining the brush is
changed with shortened brush. The recommended brush retaining pressure is 1.4kg
Ü
10%
(0.35kg/cm
2
). When the brush is replaced with a new one, be sure to fit it properly so that the entire
surface of the brush makes proper contact with the commutator surface.
Do not attempt to move the motor brush position from the current set position in any cases.
Be sure to remove the dust deposit as far as applicable, as it may cause a spark and short-circuit,
possible result in a failure.
If the commutator surface is roughened and black, it might be in some trouble.
When the commutator has been worn to rough surface, make contact with service station, as the
commutator surface needs to be ground for correction.
When servicing the motor, be careful not to allow any oil to be adhered to the commutator surface.
If it is adhered accidentally, wipe it off with a dry cotton cloth.
D
D
IRECTION CONTROL LEVER
Check the segment-to-finger contact condition.
If they have poor contact, the power application part may be heated, causing the segment to be
roughened or consumed.
Check the microswitch for operating point.
The microswitch is adjusted so that it is closed with turning on the main circuit segment and
opened before the segment is turned off.
Check each terminal for looseness.
ACCELERATOR
Check the microswitch for operating point.
The microswitch is adjusted so that it is closed to open the slit when the accelerator pedal is
stepped on approx. 10%, when the tractor starts.
The electric bulb used to irradiate the CDS(cadmium sulphide photoconductive element) and it
may be disconnected during long-time use due to vibration, etc.
Be sure to replace the bulb with a new one when it is blown, as the tractor cannot run with the
bulb blown.
FET UNIT
Be sure to remove the dust, dirt, etc. deposited at each terminal of the FET, as it can cause a
trouble.
Check each terminal for looseness. Check the terminal colored in red extremely carefully.
In case the tractor has not any trouble, but it will not travel even if the accelerator pedal is stepped
on, check for the following points :
Check whether the travelling fuse is blown or not.
Check whether the electric bulb for accelerator is properly connected or not.
Make sure that each switch and microswitch operate properly. If no failure is found in the above
checks, the FET unit is possibly defective. Since the FET unit is assembled in extremely precise
way and adjusted, do not attempt to disassemble the unit unnecessarily. When such
disassembling is necessary, be sure to make contact with HYUNDAI service shop.
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(5)
1)
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2)
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3)
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Η
Θ
Ι
4
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)
