Mec 3072RT, Руководство по обслуживанию

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"3072RT / 3772RT / 3772RT HD" Service & Parts Manual - ANSI Specifications March 2008
Page 4-13
HI RANGE
ADJU S TMENT
S CREW
PLATFORM
CONTROL S
THRE S H
LO RANGE
RAMP
Adjustment Procedure
Note: Proportional Controller adjustments should
only be made when the possibility of unau-
thorized tampering exists or after the
Proportioning Valve or Proportional Circuit
board was replaced. Though testing the
proportional output should be part of rou-
tine maintenance, adjustments should not
be necessary as a routine maintenance
procedure.
The Trim Pots are located in the Platform Controls box
(see illustration).
1. Turn the RAMP trim pot counterclockwise until a
clicking noise is heard.
2. Ensure there are no overhead obstructions
preventing lift to full height. Select LIFT mode, pull
the enable and move the Joystick in reverse slowly
to the point that the engine accelerates and hold it
at that point. While holding the Joystick in that
position, adjust the THRESH trim pot until the
platform does NOT lift. Once adjusted, slight
additional reverse motion of the Joystick should
result in very slow and controlled lift action.
•
Counterclockwise trim pot adjustment
increases the amount of Joystick travel before platform movement.
• Clockwise trim pot adjustment will allow platform movement sooner in the
Joystick travel.
3. If the machine was slow in the High Speed portion of the test, turn the HI RANGE trim pot
clockwise until a clicking noise is heard.
4. If the Elevated Speed Drive Test resulted in speeds other then those listed, turn the LO
RANGE trim pot clockwise to increase elevated drive speed or counterclockwise to
decrease elevated drive speed to the proper speed. Repeat the Elevated Speed Drive
Test.
5. The RAMP trim pot controls the smoothness of the motion start-up and linear ramp-up
response. Turn the RAMP trim pot clockwise until the slowest machine start-up can be
achieved while maintaining good proportional ramp-up through the travel of the Joystick.