JLG 642 Operation & Safety Manual page 63

Boom Functions
• Move the joystick back to lift boom; move joystick forward to lower boom; move
joystick right to extend boom; move joystick left to retract boom.
• The speed of boom functions depends upon the amount of joystick travel in
corresponding direction. Increasing engine speed will also increase function speed.
• For two simultaneous boom functions, move joystick between quadrants.
For example; moving the joystick forward and to the left will lower and retract
boom simultaneously.
TIP OVER/CRUSH HAZARD. Rapid, jerky operation of controls will cause rapid, jerky
movement of the load. Such movements could cause the load to shift or fall or could
cause the machine to tip over.
Attachment Tilt Function
Attachment tilt is controlled by the roller switch (1).
• Press the roller switch up to tilt attachment down; press the roller switch down to tilt
attachment up.
Auxiliary Hydraulic Functions
The Auxiliary Hydraulics roller switch (2) controls the function of attachments that require
the hydraulic supply for operation. See Section 5—Attachments for approved
attachments and control instructions.
Transmission Disconnect
Transmission disconnect is controlled by button (3).
Note: Verify functionality of Transmission Disconnect prior to operation.
• While applying service brake, depress and release button to enable transmission
disconnect function and disengage transmission.
While applying service brake, depress and release button to disable transmission
disconnect function and engage transmission.
• (1055, 1255 Early Production Only) While applying service brake, squeeze and hold
button to enable transmission disconnect function and disengage transmission.
While pressing service brake, release button to disable transmission disconnect
function and engage transmission.
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Section 3—Controls and Indicators
WARNING
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