TECHNICAL INFORMATION BULLETIN
March 12, 2003
740 Ejector (AZZ1-Up)
Component Code 4303
SUBJECT: New Steering Cylinders have Collar Assemblies on Rods
The new 223-1335 Steering Cylinders Group has been introduced on 735 (AWR), 740 (AXM) and 740 Ejector (AZZ) Articulated Trucks. The new steering cylinders group is effective with AWR429-Up (735), AXM823-Up (740) and AZZ292-Up (740 Ejector). As part of the mounting group for the new cylinders, collar assemblies are installed on the cylinder rods. The collar assemblies have 2 O-ring seals located in internal grooves in order to protect the cylinder rods. The collar assemblies are not serviced at this time. This could lead to problems if a steering cylinder requires replacing.
Illustration 1. (1) Collar arrangement installed on cylinder rod
If it becomes necessary to replace a steering cylinder, it will be necessary to remove the collar assembly from the old steering cylinder and install the collar assembly on the new steering cylinder.
To remove the collar assembly, remove the two capscrews that retain the collar assembly to the rod. Then, remove the collar assembly from the rod.
Illustration 2. (2) Capscrew location on earlier collar assemblies
The illustration shows an earlier collar assembly with both capscrews tapped into one segment of the collar assembly. Later collar assemblies have one capscrew tapped into each segment of the collar assembly.
Remove the two 7S-4001 O-Ring Seals from the collar assembly. Replace them with new O-ring seals. The new O-ring seals must be split in order to allow them to be installed on the cylinder rod. When you split the O-ring seals, DO NOT shorten them.
Illustration 3. (3) Internal grooves. (4) 7S-4001 O-Ring Seals cut to fit around the cylinder rod
Fit the O-ring seals into the grooves in one segment of the collar assembly. Then, assemble the collar segment to the cylinder rod as close to the eye end of the cylinder rod as possible. Open the O-ring seals to allow them to fit around the cylinder rod.
Install the second segment of the collar assembly. Make sure that the O-ring seals fit in the appropriate grooves in the collar assembly. Tighten the capscrews to a torque of 100 Nm (75 Lb Ft).
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