01JUN10
MP45.271M
MP85.6148
SENSING UNIT MAINTENANCE/SERVICE
± 1 inch side to side on a 36 foot vehicle. Typical leveling results will be better.
The sensing unit has an accuracy tolerance of ± 5.4 inches front to rear and
SENSING UNIT ACCURACY TOLERANCE
SENSING UNIT ADJUSTMENT
There are four LED’s on the Sensing Unit, A,B,C and D. Refer
while making the A-C adjustment.
adjustments first, then hold the adjustment nut from moving
Control Box. If two LED’s are on, it is best to make the B-D
be a problem with the Sensing Unit or the mounting of the
be turned more than 3/4 turn to turn the LED out, there may
to be turned more than 1/2 flat or the adjustment screw has to
screw will turn out LED’s A and C. If the adjustment nut has
the adjustment nut to turn out LED’s B and D. The adjustment
to the drawing below. The Sensing Unit is adjusted by turning
MAY BE DIFFERENT
LED’S - LOCATION
A
C
TOP VIEW - SENSING UNIT
D
B
7/8, 3/4, 1/2, 5/16 or 1/4 sizes will be needed.
screw driver or sockets w/driver or box end wrenches of
adjustments to the Sensing Unit are needed. A Phillips
are yellow LEVEL lights lit on the Touch Panel, manual
Touch Panel, the sensing unit is properly adjusted. If there
With the vehicle level , if there are no yellow light lit on the
Control Box is mounted to the power unit/valve assembly.
The Sensing Unit is mounted inside the Control Box. The
LEVEL lights. Recheck the level. If more adjustment is
"tweaking" process until the system levels the vehicle
touch panel. Recheck with a level. Repeat the
relevel the vehicle using the yellow level lights on the
the front up more. Again, unlevel the vehicle then
the front yellow light to stay on slightly longer to bring
instructions for LED’s A, B, C, and D. This will allow
the OPPOSITE direction that is given in the above
Move the adjustment for that light very, very, slightly in
which sensing unit light is the front light, A-B-C or D.
yellow level light is turning off too soon. Determine
the vehicle, the front is still low. This means the front
Example: After the initial adjustment and releveling
sensing unit, ignoring the LED’s on the sensing unit.
yellow level lights go out, instead just "tweak" the
needed, DO NOT try to adjust the sensing unit until the
SIDE VIEW - CONTROL BOX
NUT (5/16" OLD) - (1/2" NEW)
ADJUSTMENT
properly.
lights are on. Level the vehicle according to the yellow
vehicle to an unlevel position so one or two yellow
IMPORTANT: When all 4 LED’s are off, move the
If LED (D) is lit: Turn the adjustment nut CLOCKWISE
If LED (B) is lit: Turn the adjustment nut COUNTER
If LED (C) is lit: Turn the adjustment screw CLOCKWISE
If LED (A) is lit: Turn the adjustment screw COUNTER
NOTE: If opposing LED’s are lit, there is a problem with
until the LED is off.
CLOCKWISE until the LED is off.
until the LED is off.
CLOCKWISE until the LED is off.
the Sensing Unit.
ADJUSTMENT SCREW
SCREW (Phillips or 1/4")
ADJUSTMENT
NUT (7/8" or 3/4")
(OLD STYLE)
ADJUSTMENT
ADJUSTMENT NUT (5/16" OLD) - (1/2" NEW)
ADJUSTMENT
NUT (7/8" or 3/4")
BOX WALL
CONTROL
(OLD STYLE)
the control box/sensing unit.
be placed on a flat surface close to the mounting location of
use a small bubble level. If using a bubble level, the level should
vehicle trim line to determine level. An alternative would be to
to manually level the vehicle. It is recommended to use the
position the vehicle on a level surface or use the leveling system
To adjust the sensing unit, first the vehicle must be level. Either
