There are two basic adjustments which are made at the time
of installation. However, when adjustment of a leveling unit
is needed, the following procedures are recommended.
Always make vertical adjustment first. If
the vertical adjustment is changed at anytime, be sure to check
the horizontal adjustment. Vertical position is changed by adjusting
Horizontal stop is adjusted by turning the set screws located
just inside the cable locknuts. The jack can be adjusted down
to provide clearance for objects which may interfere with the
operation of the jacks. The horizontal stop must be adjusted
to provide clearance between the hat bracket and mounting
bolts; and the actuator and hose fittings, when the jack is in
the STORE POSITION. The jack must be able to fully extend
in the horizontal position without interfering with suspension com-
Each jack should be checked to be sure
that it is vertical when it swings down. To do this, retract all
jacks, then extend each jack until it is close to, but not touching
the ground. If the jack stopped short of being vertical, it can
be adjusted by loosening the lower adjusting nut and tightening
the upper nut.
The horizontal stop can be adjusted up or down in the slot to
provide clearance for objects which may interfere with operation
If the jack stopped short of being vert-
ical loosen the set screw and turn the adjusting cap clockwise.
If the jack went beyond vertical, loosen the set screw and turn
the adjusting cap counterclockwise. After each adjustment,
the weight of the vehicle must be applied to the jack to make
the adjustment effective. DO NOT adjust cap more than one
turn without cycling the jack.
The horizontal stop on the heavy-duty jack is adjusted by adding
washers under the urethane stop.
MP45.0
13FEB03
MAINTENANCE
SYSTEM ADJUSTMENT
JACK ADJUSTMENT
ADJUSTING
UPPER
STANDARD &
LOW PROFILE
UNITS
9,000 lb. JACKS
ADJUSTING
LOWER
NUT
NUT
STOP
LEVELING
HEAVY DUTY
UNITS
16,000 lb. JACKS
ADJUSTING
SET SCREW
CAP
ADJUSTING
HORIZONTAL
ADJUSTMENT
VERTICAL
ADJUSTMENT
LOCK NUTS,
SET SCREW,
6,000 lb. JACKS
ponents, tanks, etc.
NOTE: The two front jacks should be adjusted to the same
horizontal position.
1. 6,000 lb. JACKS:
2. 9,000 lb. JACKS:
3. 16,000 lb. JACKS:
the lock nuts on the actuator cable. If the jack stopped short
of vertical, tighten the lock nuts. If the jack goes past vertical,
back the lock nuts off. Be sure to adjust each nut the same
number of turns.
of the jack. The stop must be adjusted so that the jack can be
fully extended in the horizontal position without interfering with
suspension components, tanks, etc.
LEVEL SENSING UNIT ADJUSTMENT
Level the vehicle by placing a circular bubble level in the
center of the freezer floor or location within the vehicle that
is to be level. With the vehicle level, adjust the sensing unit
until all yellow lights are off. This is done by drawing up the
corresponding screw if the sensing unit is mounted below
the surface as shown or backing out the corresponding
screw if the sensing unit is mounted above the surface.
Bump the sensing unit to see that it is settled tight against
all three screw heads and still indicates that the unit is level.
BELOW THE SURFACE MOUNTING
ELECTRONIC LEVEL SENSING UNIT
MOUNTING SURFACE
SIDE
FRONT
THIS
UP
SPRINGS (3)
SCREWS (3)
