SENSING UNIT ADJUSTMENT
Level the vehicle by placing a bubble level in the center of
the freezer floor or upon whichever surface within the vehicle
that is to be level. Using the Leveling System and the bubble
level, ignoring the yellow LEVEL lights on the Touch Panel,
level the vehicle until the bubble is centered.
The Sensing Unit is mounted inside the Control Box. The
Control Box is mounted to the power unit/valve assembly.
NOTE: If opposing LED’s are lit, there is a problem with
the Sensing Unit.
If LED (A) is lit: Turn the adjustment screw COUNTER
CLOCKWISE until the LED is off.
If LED (C) is lit: Turn the adjustment screw CLOCKWISE
until the LED is off.
If LED (B) is lit: Turn the adjustment nut COUNTER
CLOCKWISE until the LED is off.
until the LED is off.
If LED (D) is lit: Turn the adjustment nut CLOCKWISE
ADJUSTMENT
NUT (5/16" OLD) - (1/2" NEW)
TOP VIEW - SENSING UNIT
ADJUSTMENT SCREW
D
C
A
B
CONTROL
BOX WALL
LED’S - LOCATION
SIDE VIEW - CONTROL BOX
MAY BE DIFFERENT
17JUN09
MP44.1610
There are four LED’s on the Sensing Unit, A,B,C and D. Refer
to the drawing below. The Sensing Unit is adjusted by turning
the adjustment nut to turn out LED’s B and D. The adjustment
screw will turn out LED’s A and C. If the adjustment nut has
to be turned more than 1/2 flat or the adjustment screw has to
be turned more than 3/4 turn to turn the LED out, there may
be a problem with the Sensing Unit or the mounting of the
Control Box. If two LED’s are on, it is best to make the B-D
adjustments first, then hold the adjustment nut from moving
MI15.4550
ADJUSTMENT NUT (5/16" OLD) - (1/2" NEW)
while making the A-C adjustment.
ADJUSTMENT
SCREW (Phillips or 1/4")
NUT (7/8" or 3/4")
ADJUSTMENT
IMPORTANT: When all 4 LED’s are off, move the vehicle to an
unlevel position so one or two yellow lights are on. Level the
vehicle according to the yellow LEVEL lights. Recheck the
level. If more adjustment is needed, DO NOT try to adjust the
sensing unit until the yellow level lights go out, instead just
"tweak" the sensing unit, ignoring the LED’s on the sensing unit.
Example: After the initial adjustment and releveling the
vehicle, the front is still low. This means the front yellow
level light is turning off too soon. Determine which sensing
unit light is the front light, A-B-C or D. Move the adjustment
for that light very, very, slightly in the OPPOSITE direction
that is given in the above instructions for LED’s A, B, C, and
D. This will allow the front yellow light to stay on slightly
longer to bring the front up more. Again, unlevel the vehicle
then relevel the vehicle using the yellow level lights on the
touch panel. Recheck with a level. Repeat the "tweaking"
process until the system levels the vehicle properly.
NUT (7/8" or 3/4")
ADJUSTMENT
SENSING UNIT ACCURACY TOLERANCE
The sensing unit has an accuracy tolerance of ± 5.4 inches front to rear and
± 1 inch side to side on a 36 foot vehicle. Typical leveling results will be better.
(OLD STYLE)
(OLD STYLE)
end wrenches of 7/8, 3/4, 1/2, 5/16 or 1/4 sizes will be needed.
needed. A Phillips screw driver or sockets w/driver or box
Touch Panel, manual adjustments to the Sensing Unit are
properly adjusted. If there are yellow LEVEL lights lit on the
are no yellow lights lit on the Touch Panel, the sensing unit is
With the vehicle level according to the bubble level, if there
625/625S SERIES LEVELING SYSTEMS
SECTION IV
LEVEL SENSING UNIT ADJUSTMENT AND ACCURACY TOLERANCE
The operation of the sensing unit should be checked with
the vehicle in several different out of level positions.
