SECTION 5 - HYDRAULICS
5-8
– JLG Lift –
3121623
5.5
DRIVE GEAR MOTORS
Each drive gear motors runs forward or backward inde-
pendently, it's so possible to turn the machine. Drive gear
motors are controlled by the ground valve-blocks and
each one is equipped with an automatic brake that is
hydraulically deactivated only while it runs.
Drive gear motors are equipped with a second speed sys-
tem, indeed they are variable capacity so that they can
perform two different hydraulic speeds in order to change
tracks speeds further that rpm regulation.
The second speed block contains the coil in charge to acti-
vate the second speed, selecting RABBIT from remote con-
trol button the control module will energize that coil.
When that coil is energized oil is sent to both drive gear
motors to move their plate so that their chamber capacity
will be reduce.
With reduced capacity the gear rate is increased so that
the tracks speed is increased too.
This second speed system is also controlled by an auto2speed valve, in case of an higher torque is required to the drive
gear motors, such as driving uphill, the second speed line pressure will raise and if it overcomes the calibrated maximum
pressure (26 bar) it will automatically open the auto2speed valve reducing the gear rate and the tracks speed.
SECOND SPEED
VALVE COIL
AUTO2SPEED
VALVE
SECOND SPEED
PRESSURE GAUGE
SECOND SPEED
PRESSURE
CALIBRATION
PLUG
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