TIBU-6686-02

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Technical Information Bulletin
CT660 Rattle May Be Caused by Loose Cab Torque Arm{7000}
Media Number -TIBU6686-02
Publication Date -2014/06/16
Date Updated -2014/06/16
Caterpillar: Confidential Yellow
i05833493
CT660 Rattle May Be Caused by Loose Cab Torque Arm{7000}
SMCS - 7000
On Highway Truck:
CT660 (S/N: TRK1-886; TKL1-190)
Introduction
A permanent solution was found and the correction was made at the factory. Proper solution is to
torque bolts to the specifications that are provided in this bulletin.
Problem
The fastener that is in the joint between the cab shock absorber and the cab/frame may be under
torqued. The fastener between the lateral control rod and the cab/frame may also be under torqued.
This condition can allow movement and a rattling noise may occur.
Solution
Proper torquing of mounting hardware at the factory. This solution was achieved through process
improvements on the assembly line. Inspection of cab shock assemblies is no longer needed. Shock
absorber mounting hardware torque values are 54 N·m (lb ft) to 68 N·m (50 lb ft). Lateral control rod
mounting hardware torque values are 95 N·m (70 lb ft) to 122 N·m (90 lb ft).
If the cab torque arm will not achieve the torque value, replace the arm with 435-4111 Rod . This arm
has a non-spilt bushing.
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Illustration 1
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g03071156
Shock absorber mounting hardware.
Torque the two bolts indicated in Illustration 1 to 54 N·m (lb ft) to 68 N·m (50 lb ft).
Illustration 2
g03071181
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Lateral control rod mounting hardware. One bolt is visible the second bolt is at the other end of the rod and is not visible
in this illustration.
Torque the two bolts indicated in Illustration 2 to 95 N·m (70 lb ft) to 122 N·m (90 lb ft).
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Tue Jul 1 16:18:36 CDT 2014
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