SHIM-R.BRG.-UP 5B3004 - Caterpillar

Excavator:
307D (S/N: WZX1-883,1001-1594)
Mini Hydraulic Excavator:
306 (S/N: SMD1-642; MXH1-1149,1152-2017)
ReferenceSpecial Instruction, REHS8124, "Rework Procedure for the Engine Timing Chain on Certain 306 and 307D Excavators"On certain 306 and 307D Excavators the engine timing chain can substantially elongate. Without adhering to the required service maintenance check every 1000 hours, the elongation will cause a weakening of the chain-driven operation quickly.A Special Instruction containing information to replacing the timing chain with an improved timing chain is now available on the machines listed above.For the complete information and the instruction to replace the engine timing chain, refer to Special Instruction, REHS8124, "Rework Procedure for the Engine Timing Chain on Certain 306 and 307D Excavators".The Special Instruction can be found on the Caterpillar service information system (SIS) and through the normal literature distribution system at your local Cat dealer.