Component Replacement
42
17730-299
ULTIMAAX
®
for Fire and Rescue Vehicles
INSPECTION
After removing the center bushing, thoroughly inspect the beam bore . If damaged, replace
with a new equalizing beam .
DO NOT
attempt to re-bush or use an equalizing beam that has
been damaged .
FAILURE TO REPLACE AN EQUALIZING BEAM THAT HAS BEEN DAMAGED FROM BUSHING REMOVAL
CAN RESULT IN THE FAILURE OF THAT BEAM, LEADING TO ADVERSE VEHICLE HANDLING AND POSSIBLE
PERSONAL INJURY OR PROPERTY DAMAGE .
When installing new center bushings the following steps will minimize the chance of damaging
a new bushing:
1 . Clean the bore of the equalizing beam with emery cloth or ball hone, removing any nicks or
metal buildup from bushing removal .
2 . Measure the inside diameter of the equalizing beam center bore . The specification for the
inside diameter
of the equalizing beam center bore on a new ULTIMAAX equalizing beam is
3 .886" ± 0 .003" (98 .7 mm ± 0 .1 mm), calculate the mean of any two measurements 90°
apart in the same plane, see Figure 8-22 . If the mean is
NOT
within the specified range, replace-
ment of the equalizing beam is required .
NOTE
Always use the bushing outer metal for pressing operations . Pressing on the bushings inner metal
may damage the bushing and require bushing replacement .
FIGURE 8-22
FIGURE 8-23
FIGURE 8-24
ASSEMBLY
1 . The equalizing beam bore may have a more substantial
lead in chamfer at one end of the bore than the other,
see Figure 8-23 . Take advantage of the larger chamfer by
pressing in the new bushing from this end .
2 . Place the equalizing beam in a shop press on the receiv-
ing tool or press . Support the beam squarely at the center
bore area to avoid distortion of the beam bore or bending
of the beam .
3 . Lubricate the equalizing beam bore and the equal-
izing beam center bushing outer metal sleeve with an
NLGI#2 – EP (Extreme Pressure) grease, see Figure 8-24 .
NOTE
The ULTIMAAX center bushing has voids that must be
positioned horizontally front and back, see Figure 8-25 .
NOTE
The center bushing must be square with the equalizing beam
hub before pressing the center bushing into the beam . Center
bushings pressed in at an angle will damage the center bushing and the equalizing beam, see
Figure 8-26 .
Lead in Chamfer Edge
in Equalizing Beam
Center Bushing Bore
Inside diameter
of the equalizing beam center
bore on a new ULTIMAAX equalizing beam is
3.886" ± 0.003"
(98.7 mm ± 0.1 mm)