EQUALIZING BEAM SUSPENSION (HENDRICKSON)
CLEANING, INSPECTION AND REPAIR
LEAF SPRING ASSEMBLY
1.
Wash all parts in cleaning solvent or use steam
cleaning equipment to remove grease and scale.
Use a wire brush to hasten dirt removal.
CAUTION DO NOT IMMERSE RUBBER SPRING
BUSHINGS IN CLEANING SOLVENT. USE A NON-
PETROLEUM BASE TYPE RUBBER LUBRICANT
ON A CLEAN CLOTH TO WIPE THESE PARTS
CLEAN.
2.
Remove spring center bolt. Inpect all spring leaves
for breakage and cracks. Also compare arch of
leaves with new leaves and if leaves are flattened
out, replace.
3.
Spring pins must be replaced if they are worn,
corroded or cracked.
4.
Spring eye bushing and spring shackle bushing must
also be replaced if defective.
5.
Inspect spring hangers for wear or elongated holes
and cracks. Replace hangers if defective.
6.
Always use new center bolts at each overhaul.
7.
Lightly lubricate spring leaves with a thin coat of IH-
251H-EP multi-purpose grease. Place spring leaves
in proper order and align center bolt hole with a long
drift.
8.
Compress spring leaves sufficiently for installing
center bolt and nut. Always use new center bolts at
each overhaul. Tighten center bolt to specified
torque.
WARNING
-
WHEN
ASSEMBLING
SPRING
LEAVES, BE CAREFUL TO PREVENT PHYSICAL
INJURY TO PERSONNEL.THE USE OF SPECIAL
HOLDING FIXTURES OR "C"
CLAMPS
FOR
HOLDING SPRING LEAVES IN PLACE DURING
ASSEMBLY IS STRONGLY RECOMMENDED.
9.
Align spring leaves by tapping with hammer and
position rebound clips on spring. If bolted type clips
are used, install spacers, bolts and nuts. Tighten
enough to hold leaves in alignment but not enough to
restrict free movement. If clinch type clips are used,
bend ends of clips down on top leaf. Heat clips with
torch to help eliminate breakage.
LOAD CUSHIONS
Visual
inspection
will
determine
necessity
for
replacement.If the load cushion is cut or damaged, it
will lose its capacity and replacement should be
made. The height of the load cushion is 10 cm (3-
15/16") and it is possible that a permanent set could
come about in service. A permanent set of not more
than 19mm (1/4") would still make the cushion
acceptable for use. This means that a cushion with a
free height of less than 9.37 cm (3-11/16") should be
renewed.
The load cushions are made of butyl and natural rubber and
are not resistant to petroleum products. If the cushions
become saturated with these products they will split and
disintegrate. In an operation where these products are used,
an oil resistant compound load cushion is available.
Replace cushions, if they have taken a permanent set, and the
height is 9.37 cm (3-11/16") or less.
DRIVE PIN BUSHING
1.
vertical drive pin bushings should be pressed out of
the saddles from the top side. If the outer sleeve is
frozen to the saddle wall, press the inner sleeve and
rubber out of the bushing and work the outer sleeve
out of the saddle. Do not cut with torch or use heat
as aluminum saddle Is Heat Treated.
2.
Clean the bushing cavities in the saddles with solvent
and remove any nicks with emery cloth.
3.
This bushing is not pressed to fit as there is at least
.18mm (.007") clearance and new bushings can be
hand pressed.
4.
Reinstall bushing caps and locknuts to specified
torque rating. (See Torque Chart).
EQUALIZER BEAM END BUSHING REPLACEMENT
Refer to the SERVICE portion of this manual section
pertaining to the WARNING regarding equalizer beams.
1.
Cut off rubber bushing flush with equalizer beam, as
shown’ in Figure 6. Rubber must be removed to
permit adapter to contact bushing sleeve squarely.
Figure 6 - PreparIng for Removal of Beam End Bushing
Bushing
CTS-4169 - Page 6
