JLG 3246E2 ANSI Service Manual - Manual (Page 46)

SECTION 2 - PROCEDURES
2-32 – JLG Lift – 3120737
2.18 PRESSURE SETTING PROCEDURES
NOTE: Make all pressure adjustments with motor operating
and hydraulic oil at normal operating temperature. In
addition, all functions must be operated from the
platform control station in order to achieve full pump
speed. It may be necessary to use an assistant to
adjust the pressure settings while operating the func-
tions from the platform control station.
Lift Relief for Non Proportional Control
Machines
1. Install a pressure gauge at gauge port MP, located at
the inside top of the valve body. The port is identified
by a stamping on the valve body.
2. Disconnect the hose from valve port 3, then plug the
hose and the valve port.
3. From the platform control station, activate the Lift Up
function by pressing the LIFT switch and activating
the controller to the full forward position.
4. Adjust Lift Relief to value in the Pressure Settings
Chart.
5. Shut down hydraulic system and remove pressure
gauge.
Steer Adjustment for Non Proportional
Control Machines
1. With pressure gauge at "MP" port on control valve
activate steer in either direction.
2. Adjust Steer Relief to value in the Pressure Settings
Chart.
Main Relief Pressure Switch for Non
Proportional Control Machines
1. Install a pressure gauge at gauge port MP, located at
the bottom front of the valve body. The port is identi-
fied by a stamping on the valve body.
2. Disconnect the power from the drive valve on top of
the valve body.
3. Activate drive by moving the joystick to the full for-
ward position.
4. Adjust Main Relief to value in the pressure setting
chart.
5. Reinstall the electrical connections to the drive
valve.
Lift Relief Adjustments for Proportional
Control Machines
1. Install a pressure gauge at gauge port MP, located at
the inside top of the valve body. The port is identified
by a stamping on the valve body.
2. Disconnect the hose from valve port 3, then plug the
hose and the valve port.
3. From the platform control station, activate the Lift Up
function by pressing the LIFT switch and activating
the controller to the full forward position.
4. Adjust Lift Relief to value in the Pressure Settings
Chart.
5. Shut down hydraulic system and remove pressure
gauge.
Steer Adjustment for Proportional Control
Machines
1. With pressure gauge at "MP" port on control valve
activate steer in either direction.
2. Activate drive by pressing the drive switch and acti-
vating the controller to the full forward position.
While holding the controller, activate steer right and
check steer right pressure. If necessary, adjust steer
right pressure to value in the Pressure Settings
Chart.
3. Activate drive by pressing the drive switch and acti-
vating the controller to the full forward position.
While holding the controller, activate steer left and
check steer left pressure. If necessary, adjust steer
left pressure to value in the Pressure Settings Chart.
Main Relief and High Drive Pressure Switch
for Proportional Control Machines
1. Install a pressure gauge at gauge port MP, located at
the bottom front of the valve body. The port is identi-
fied by a stamping on the valve body.
2. Close the steer valve completely by turning clock-
wise.
3. Once the steer valve is closed activate the steer
switch in either direction until the steer cylinder bot-
toms out.
4. Adjust your Main Pressure to value in the Pressure
Settings Chart.
5. Once you have adjusted your main pressure be sure
and reset your steer pressure back to value in the
Pressure Settings Chart.