TB20J Plus Maintenance Manual 135
© Feb. 2023
10 FUNCTIONS AND CONTROLS
10.1 DRIVE FUNCTION
Driving at reasonable speed is essential for ensuring
machine safety. The drive function should respond
quickly and smoothly under the control of the operator.
The machine should travel without shaking, shocks and
abnormal noise over the controllable speed range. To
ensure that the drive unit runs smoothly and keeps good
condition, it is recommended to check the drive function
every 3 months or after 250 hours of operation.
Select flat, level, unobstructed and solid ground to per-
form the following tests with the platform carrying one
person and stowed:
1. Mark two straight lines with the distance of 30m
(98.4ft) on the ground as the test start and stop
lines.
2. Start the machine.
3. Depress the foot switch.
4. Slowly push the travel/steer control handle forward
to the full drive position.
5. Move the high/low engine speed selector switch on
the platform controller to switch the engine speed to
high speed (if the machine is equipped with an
engine).
6. Push the high/low travel speed selector switch on
the platform controller upwards to switch the travel
speed to high speed.
7. When the front wheel contacts with the test start
line, press the timer to start timing.
8. Keep the machine running at high speed until the
contact point between the front wheel and the
ground reaches the test stop line, and stop timing.
9. Calculate the travel speed with the measured data
and compare it with the specified maximum travel
speed in the stowed position.
NOTICE
If the above calculation result exceeds the maximum
travel speed in the stowed position by 10%,
immediately lower the platform to the stowed position,
turn off and mark the machine, and contact a qualified
service technician for inspection and repair.
10.2 BRAKING FUNCTION
Proper braking function is essential for the safe opera-
tion of the machine. The braking device should respond
quickly and smoothly without any abnormal noise under
the control of the operator. To ensure that the brake de-
vice works smoothly and keep good condition, it is rec-
ommended to check the brake device every 3 months or
after 250 hours of operation.
The braking distance of the machine controlled within
the normal range is an important indicator of the normal
braking function of the machine. Select flat, level, unob-
structed and solid ground to perform the following tests
with the platform carrying one person and stowed:
1. Check to make sure the drive hub cap is engaged.
2. Mark a test line on the ground as a reference.
3. Start the machine.
4. Depress the foot switch.
5. Slowly push the travel/steer control handle forward
to the full drive position.
6. Move the high/low engine speed selector switch on
the platform controller to switch the engine speed to
high speed (if the machine is equipped with an
engine).
7. Push the high/low travel speed selector switch on
the platform controller upwards to switch the travel
speed to high speed.
8. When the front wheel contacts with the test line,
quickly release the travel/steer control handle.
9. Measure the vertical distance between the test line
and the contact point between the front wheel and
the ground, which is the braking distance.
10. Compare the measured distance with specified
braking distance at full travel speed.
NOTICE
If the measured distance exceeds the specified
maximum braking distance, immediately lower the
platform to the stowed position, turn off and mark the
machine, and contact a qualified service technician
for inspection and repair.
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