Trunnion Supports May Develop Cracks on Landfill Compactors, Soil Compactors, Wheel Dozers, and Wheel Loaders Caterpillar


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Trunnion Supports May Develop Cracks on Landfill Compactors, Soil Compactors, Wheel Dozers, and Wheel Loaders [TIBU4391]
FRAME AND BODY
FRAME GP
Trunnion Supports May Develop Cracks on Landfill Compactors, Soil Compactors, Wheel Dozers, and Wheel Loaders

CONFIDENTIAL TIBU4391

TECHNICAL INFORMATION BULLETIN

October 27, 2004

Landfill Compactors

 

Soil Compactor

Wheel Dozers

 

 

 

Wheel Loaders

 

 

826GII (AYH1-Up)

836G (BRL1-Up)

825GII (AXB1-Up)

824GII (AWW1-Up)

834G (BPC1-Up)

844 (BBN1-Up)

854G (AMP1-Up)

988G (BNH1-Up)

990II (BCR1-Up)

992G (AZX1-Up)

994 (9YF1-Up)

994D (3TZ1-Up)

Component Codes 7051, 3268

SUBJECT: Trunnion Supports May Develop Cracks on Landfill Compactors, Soil Compactors, Wheel Dozers, and Wheel Loaders

PROBLEM:

The front and rear trunnion supports on the rear oscillating axle may develop cracks or the bolts may come loose if the rear frame mounts are not parallel. This can be a problem if the rear frame is cracked or was previously repaired.

SOLUTION:

Inspect the trunnion supports, bolts, and rear frame for cracks during routine machine maintenance. This inspection is recommended even if prior rear frame cracks were repaired. Trunnion support cracks are most likely to start at the top of the support beam next to the frame or between the mounting bolts. If cracks are found in the trunnion support, do not attempt to repair them by welding. Replace the cracked trunnion support.

If cracks are found in the rear frame and the cracks are not repaired, the trunnion support will crack and possibly fail causing engine damage. Refer to any separate literature for repair of rear frame cracks or contact AVSpare Product Support for assistance. Make sure the trunnion mounting plates are parallel from side to side. To check if the mounting plates are parallel, use a straight edge or install the trunnion support. When using the trunnion support, install two bolts per side, one at each outside corner. Tighten the bolts to only 100 N-m (74 lb ft) in order to position the support in contact with the mounting plate. When using the straight edge, check several locations over the full length of the mounting plate. Use a feeler gauge or an appropriate measuring tool in order to measure any gaps between the mounting plate and the trunnion support or between the mounting plate and the straight edge. If there are gaps that are larger than 1 mm (.04 inch), rework the mounting plates until the gaps are less than 1 mm (.04 inch).

If the two mounting plates are not parallel, the trunnion support and the mounting bolts will be in bending stress. Additional failures in the trunnion support, mounting bolts, or the rear frame may occur.

The following table shows the part numbers for the trunnion supports of the affected machines.

 

Trunnion Support

Model

S/N:

Front

Rear

Landfill Compactors

826G II

AYH

105-8704

105-8703

836G

BRL

164-2752

164-2751

Soil Compactor

825G II

AXB

105-8704

105-8703

Wheel Dozers

824G II

AWW

105-8704

105-8703

834G

BPC

164-2752

164-2751

844

BBN

4E-3095

4E-3096

854G

AMP

235-8668

6W-6368

Wheel Loaders

988G

BNH

164-2752

164-2751

990 II

BCR

4E-3095 

4E-3096

992G

AZX

235-8668

6W-6368 

994

9YF

165-4014

165-4015

994D

3TZ

165-4014

165-4015

 

 

 

COPYRIGHT 2004 AVSpare ALL RIGHTS RESERVED

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