CYLINDER GP-BOOM 2063630 - Caterpillar

D11N, 776B Tractors;
777B, 785, 789, 793 Trucks;
994 Loaders;
3500 Family Of EnginesThree different rocker arm shafts and rocker arm shaft bolts have been used. The chart identifies the different rocker arm shafts and bolts. Both the "First" (1W2422) and "Second" (2W8888) design rocker arm shafts have been canceled and replaced by the current 7C2377 Rocker Arm Shaft.
It is not necessary to replace both the 4W9779 Bolts and 2W8888 Shaft, if the shaft is not damaged. The 2W8888 Shaft can be used with two new 8T7581 Bolts if the shaft is counterbored to a 16.5 mm (.65 in) diameter, 8.0 1.0 mm (.31 .04 in) deep as shown in the illustration. If new 8T7581 Bolts are used to install an unmodified 2W8888 Shaft, the result could be inadequate lubrication supply for the rocker arms.
Dimensions for modifying 2W8888 Shaft for use with 8T7581 Bolts. 2W8888 Shaft (1). 8T7581 Bolt (2). 5P7213 Washer (3).