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March 27, 2020 Service bulletin

DEF tank covers may become loose and potentially crack on vehicles built before October 2019 with DEF tank...

Kenworth technical service bulletin 43-066 for 2015-2019 Kenworth T680, 2015-2016 Peterbilt 379 and 2015-2019 Peterbilt 579 and others.

Bulletin number
43-066
Component
Structure
Summary
DEF tank covers may become loose and potentially crack on vehicles built before October 2019 with DEF tank part number M86-6221-003 (TANK-DEF MEDIUM ASSY) and M86-6222-003 (TANK-DEF LARGE, ASSY). Resolution is to resolve the vibration on the tank cover by adding bottom tank washers.

Owners of these vehicles have filed 8 complaints in the body category.

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