ENGINE AR 2231556 - Caterpillar

Track-Type Tractor:
D6K (S/N: DHA1-UP; FBH1-UP)
ReferenceSpecial instruction, REHS7598, "Procedure for Installing Improved Carrier Roller Groups on Certain D6K Track-Type Tractors"ReferenceSpecial Instruction, REHS7603, "Improved Undercarriage Components are Available for D6K Track-Type Tractors"Several undercarriage components have changed to improve field performance of the D6K Track-Type Tractors.Special Instruction REHS7598, describes improvements to the carrier roller shaft which increases the service life of the carrier roller.Special Instruction REHS7603, describes various improvements to the sprockets, idlers, and track rollers. These improvements will reduce or eliminate thrust bias wear and random wear on the SystemOne tracks of the D6K machines experiencing either type of wear. This Special Instruction also describes the addition of clamp master links to the D6K SystemOne link assembly to improve serviceability of the track.Reference both Special Instructions for more details on D6K undercarriage improvements.