EQUALIZING BEAM SUSPENSION (HENDRICKSON)
All oscillating parts with the exception of spring pins and
optional bronze center bushings are rubber bushed.
Since rubber bushings require no lubrication, lubrication
points have been reduced to a minimum. Those
suspensions equipped with spring pins and/or bronze
bushings should be lubricated at the fittings provided. For
lubrication intervals, refer to Operators Manual. For
LUBRICATION section CTS-4033.
Clean all dirt from suspension parts and inspect all parts
carefully for cracks or damage. Inspect rubber bushings
for damage or deterioration. If the vehicle has been in
service for a long time, it is advisable to replace all
Most repairs to the suspension system consist of
replacing worn or damaged parts. The major item which
will concern the serviceman is removal and replacement
of the rubber bushings.
While the bushings have long life and replacement will
be limited, they can be replaced if damaged or
deteriorated. Special service tools for performing this
task are available, and though recommended are not
absolutely necessary. If press equipment is available,
standard steel tubing having diameters to match the
bushing sleeves (metal bands surrounding rubber
bushings) can be used as adapters for removing and
installing the bushings (see SPECIFICATIONS). Press
pressures required to remove the bushing and sleeve
assemblies will generally be between 31 and 45 Mg (35
and 50 tons).
Special tool equipment is available which can be used to
replace the equalizer beam bushings without completely
removing the equalizer beam from the chassis.
The tool can also be used to replace the bushings with
the equalizer beams removed. Operating instructions are
furnished with the equipment. However, the "CAUTION"
notices pertaining to equalizer component replacement
provided in this service manual should be followed.
WARNING - WHEN REPLACING EQUALIZER BEAM
BUSHINGS ONLY THE PROCEDURES OUTLINE IN THIS
MANUAL SECTION SHOULD BE EXERCISED.
ATTACHING MATERIAL TO THE EQUALIZER BEAM MUST
NEVER BE PERFORMED AS SUCH PRACTICE CAN
RESULT IN EQUALIZER BEAM FAILURE. EQUALIZER
NODULAR IRON, METALS WHICH CAN EASILY BECOME
BRITTLE WITH HEAT AT QUITE LOW TEMPERATURES.
WHEN REPLACING EQUALIZER BEAM BUSHINGS THE
HEATED, IF CAVITIES HAVE BEEN PRODUCED OR
OTHERWISE DAMAGED BY IMPROPER SERVICING AND
IF SO, REPLACE ANY COMPONENTS WHICH ARE
Except for different suspensions (leaf springs or rubber
cushions) and slight variations in size, all equalizing
beam suspension systems are disassembled in the
same manner. There are several approaches to
servicing the suspension system, but when a major
overhaul is required, the complete tandem unit can be
removed from the truck chassis. Torque arms, equalizer
beams, springs and other parts, however, may be
removal is performed, be careful disconnecting torque
rods, springs or rubber cushions from the frame since
axle assemblies are free to roll or pivot at the equalizer
beam ends. Use jacks and other equipment to block
vehicle securely. This will prevent harm to personnel
and avoid damage to the unit.
Suggested disassembly procedure is as follows:
Block tires on both axles.
control linkage (or piping), and brake lines from
Remove the axle shafts from both rear axles.
Remove the four saddle caps locking center
Disconnect torque rods from axle housing by
loosening locknuts and driving the shaft from the
bushing and the axle housing bracket.
sufficiently so that the lower part of saddle clears
the top of the axle housings. Block frame
securely. Block axles to prevent them from
pivoting on wheels.
Roll axles with beams attached out from under
Disconnect equalizer beams from axle housings.
Bolt type beam end mounting, Figure 4.
Remove equalizer beam end bolt.
Drive bushing adapters and sleeve (if so
equipped) out of bushing and axle housing
brackets. Adapters are notched to help keep
chisel in place between axle bracket and
adapter. Driving chisel first one side then the
other side of adapter will wedge out adapter.
After the first adapter is removed, the opposite
adapter can be driven out with an impact
hammer or heavy bar and hammer.
CTS-4169 - Page 4