Group 26, Steer Axle
SM 765, Dec ’06 Steering Axle Specifications and Description • 26-1-1
Specifications
Steering System Relief Pressure Setting : 10000 kPa
(1450 psi)
Steer Cylinder Type : Double-acting, piston-type
Turning Arc : 83° maximum inside turning angle
59° maximum outside turning angle.
Bearing Grease : Grade No. 2 EP multi-purpose grease,
Clark Part MS-107C.
Fastener Torques
Steer Axle Mounting Bolts: 170-190 N⋅m (125-140 ft-lb)
Cylinder to Axle Mounting Bolts: 280-320 N⋅m (205-
234.5 ft-lb)
Steering Link to Steering Knuckle Nuts: 135-150 N⋅m
(98-110 ft-lb)
Steer Knuckle King Pin Castle Nuts: See installation pro-
cedures in Section 4, “Steer Axle Overhaul.
Service Intervals
Steering Linkage Inspection and Lubrication: Every 50-
250 hours and each PM.
Steer Wheel Bearing Inspection and Lubrication: Every
50-250 hours of operation.
Steer Cylinder Seals Leakage Check: Every 50-250 hours
and each PM.
Steer Axle Mounting Inspection: Every 50-250 hours and
each PM.
Power Steering Relief Pressure Check: Every year or 2000
hours of operation.
Description
The steer axle has the steer cylinder, steer knuckles, and
steering links mounted on it. All these components can be
removed, serviced, and replaced.
The steering gear (steering control unit) at the base of the
steering column directs hydraulic fluid to one end or the
other of the steer cylinder to pivot the steer wheels.
The steer axle is bolted to the truck frame. The steer cylin-
der is connected to the steering knuckles by steer links.
Mounting trunnions allow the axle to tilt independently of
the truck and “silent” mounts cushion the axle on the trun-
nions.
All bearings used in the steer axle linkage have lubrication
fittings and are serviceable. Axle removal, replacement,
and service for all components, including overhaul of the
steer cylinder, is explained in the Sections for this Group.
Section 1
Steering Axle Specifications and Description
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