Upright X27-33RT, Service & Parts Manual

Page: 23 / 134

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Auto Level System Troubleshooting
If the auto level system fails to level the
machine there could be electrical or
hydraulic problems.
If the lift enable light comes on but the
machine is not level or the auto level
board has been removed or replaced the
unit will need to be re-calibrated.
An EZcal is required to do this.
❑
Test procedures
1. Remove the stabiliser cylinder covers.
2. Verify that the micro switches are working by
operating them by hand. An EZcal can be
plugged into the auto level board to verify the
signals are reaching the board.
3. Verify that electrical signals are being sent
from the auto level board to the stabiliser
valves when auto level is selected.
There should be approximately 12 volts
across each leg coil and the stabiliser divert
valve when auto level is selected.
4. Verify the hydraulic system by manually
powering the stabiliser divert valve at each
leg coil individually with the engine running.
Each leg should move both up and down.
❑
Using the EZcal
1. Plug EZcal into the P1 port of the auto level
board (see Figure 1.), and turn on the
ignition of the SR.
Figure 1.
NOTE:
The EZcal is a menu driven measuring and
calibration device. Use the
four arrow keys to
scroll through menus and levels within menus, the
enter key to enter/confirm data, and the escape
key to cancel an operation or return to a previous
menu level.
Incorrect use of the EZcal could lead to
safety issues and result in damage to the
machine.
Ensure that you carefully follow the
procedures set out below.
2. The display screen will show the following
information (See Figure 2.).
Figure 2.
3. Use the [RIGHT ARROW] to scroll through to
[DIAGNOSTICS] then press [ENTER].
4. Use the [RIGHT ARROW] to scroll to
[SWITCHES] and press [ENTER].
NOTE:
The designations LR, RR, RF, and LF used
subsequently refer to leg positions
with respect to
the auto level board not the position on the
machine (see Figure 3.).
Figure 3.
SR3370 & SR2770 – 13184B Rev D page 19
Maintenance Information
WARNING
GP122 MENU:
HELP:PRESS ENTER
FRONT OF SR
REAR OF SR
ENGINE
CABINET
HYDRAULIC
CABINET
AUTO LEVEL
BOARD
RR
LR
RF
LF
P2-2
P4-2
P2-1
P4-1
P2-3
P4-3
P2-4
P4-4