CONFIDENTIAL TIBU3853
TECHNICAL INFORMATION BULLETIN |
June 4, 2003 |
Wheel Dozers Landfill Compactors Wheel Loaders |
836G (S/N: 7MZ1-Up, BRL1-Up) 988G (S/N: 2TW1-Up, BNH1-Up) |
Component Codes (7056) |
SUBJECT: Loose Counter Weights Can Cause Banging Noise When Turning
PROBLEM: There have been field reports on 988G/836G/834G machines of noises such as a bang after changing steering directions. This can be caused by loose counterweight material in the rear bumper assembly. There are stacks (some vertical and some horizontal) of steel plates welded together and used as counterweight in eight different compartments in the 166-2833 Bumper Assembly. The counterweight plate welds can break and the plates shift while turning causing a banging noise in the rear bumper area.
The challenge is identifying which compartments have loose counterweights as a half of them are not visible and are inaccessible without cutting open the bumper. There are reports of loose plates in both the visible and "hidden" compartments. For reference, the eight compartments are described in following table:
166-2833 Bumper Assembly Counterweight Compartments |
||
Counterweight P/N |
Location |
View Access |
197-6561 |
Right hand side under battery disconnect switch door |
Open battery disconnect access door |
197-6561 |
Left hand side under 192-8848 Plate Assembly |
Remove bolt-on plate assembly |
197-5376 |
Left hand side under 192-8848 Plate Assembly |
Remove bolt-on plate assembly |
197-5374 |
Center of bumper under radiator assembly |
Look under radiator assembly or through four bolt access plate in bottom of bumper |
132-9687 |
Outside right of rear tapered bottom section |
No access1 |
132-9687 |
Inside right of rear tapered bottom section |
No access1 |
132-9687 |
Inside left of rear tapered bottom section |
No access1 |
132-9687 |
Outside left of rear tapered bottom section |
No access1 |
1 - Access to this compartment can be made by cutting access holes in the bumper assembly under the 173-5986 & 173-5987 Tread plates. These counterweights consist of vertical plates welded into four compartments across the rear of the bumper.
SOLUTION: The following procedure is for the counterweights that have no viewing access.
Figure 1.
Figure 2.
Figure 3.
5. Paint repaired areas as needed and install tread plates.
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