17730-299
17
Preventive Maintenance
ULTIMAAX
®
for Fire and Rescue Vehicles
■
Look for the equalizing beam to be lower in the axle bracket, see Figure 6-6 .
■
If the adapter style end bushing is visually offset, a floor jack test should be performed,
refer to Jack Test in this section .
FIGURE 6-6
FIGURE 6-7
3 . The beam end adapter style connections have
the flange of the adapter cut off for assembly
clearance with the axle housing bowl .
■
The flat must be positioned vertically as
shown in Figure 6-7 . If the flat of the adapter
position is incorrect, removal of the fasten-
ers will be necessary to correct position,
refer to the Adapter Style End bushings in
the Component Replacement Section .
JACK TEST
FIGURE 6-8
1 . Place a jack under each beam end as shown .
Raise the jack to check for movement in
the connection or rubber components, see
Figure 6-8 .
NOTE
The gap at each side of the visible rubber on the
lower part of the bar pin end bushing is normal,
see Figure 6-8, and is not an indication to replace
the bushing . Because all rubber end bushings are
in compression, with the load bearing on the top
side, the lower side of the rubber is slightly relieved,
allowing the rubber to move inward, and a gap
appears .
PHYSICAL INSPECTION
IF BUSHING MOVEMENT OR LOOSENESS IS NOTED IN THE EQUALIZING BEAM END HUB, DO NOT
OPERATE THE VEHICLE . REPLACE THE RUBBER END BUSHINGS AND ALL CONNECTING PARTS .
THE ABOVE CONDITION CAN RESULT IN COSTLY REPAIR, DOWNTIME, POSSIBLE SEPARATION OF
COMPONENTS, ADVERSE VEHICLE HANDLING, PROPERTY DAMAGE, OR PERSONAL INJURY .
C
L
C
L
Axle Bracket
GOOD BUSHING
A
bushing will result in the equalizing
GOOD
beam end hub appearing to be
centered
with the centerline of the end bushing
in the axle bracket
A
bushing will result in the equalizing
WORN
beam end hub appearing to be / " (15 mm)
5
8
offset/below
the centerline of the end bushing
in the axle bracket
Axle Bracket
WORN BUSHING
Axle Bracket
Adapter
Equalizing
Beam
Adapter
Flat Side
Vertical
Chisel Reliefs
Axle Bracket
Supplied by
Vehicle
Manufacturer
Gap in rubber of
End Bushing
is normal