J40XM J50XM J60XM J65XM [A216]
This section has the description and repair procedures
for the steering axle. See the following sections for addi-
tional information on the parts of the steering system:
THE STEERING CONTROL UNIT and HYDRAU-
DESCRIPTION (See FIGURE 1.)
The steering axle assembly includes an axle frame,
steering cylinder and two spindle and hub assemblies.
The steering axle is connected to the frame with center
pivot mounts. The center pivot mounts on the axle frame
are fastened to the lift truck frame with rubber mounts.
The steering axle can make an articulated motion and
give the lift truck a smoother travel over rough surfaces.
The end caps of the steering cylinder are also the mounts
for the cylinder and are held to the shell by the mount
capscrews. O–rings, seals, and wipers in the end caps
are used to keep the oil inside of the steering cylinder.
The ends of the piston rod extend from both ends of the
cylinder. A single piston and the seal are at the center of
the rod. Oil pressure on one side of the piston moves the
piston in the bore. When the piston moves in the bore, it
pushes an equal amount of oil from the opposite end of
the cylinder. This oil returns to the steering control unit.
When the piston reaches the end of the stroke, a relief
valve controls the oil pressure so that the components
are not damaged. Tie rods connect the spindle arms to
Each spindle turns on two tapered roller bearings. The
spindle and bearings are held in the axle frame by a king-
pin. The preload on the bearings is controlled by a
threaded nut on the bottom of the king pin.
The wheel or hub rotates on two tapered roller bearings
and is held on the spindle by a castle nut. The preload on
the bearings in the hub is adjusted by the castle nut. A
grease seal in the inner hub and a hub cap protect the
bearings from dirt and water. A wear sleeve in the inner
hub protects the hub fro