2008/07/14 Caterpillar

Caterpillar Products: Machine Engines

All 3500 Series

Description of Change: New piston assemblies have an improved cover plate. The new plate is designed with new geometry that improves retention of the plate.

Adaptable To:

Illustration 1	g01603234
Section view of piston (1) 298-0306 Cover Plate

• The 282-0644 Piston has been cancelled and replaced by the 314-5005 Piston .

• The 278-0247 Piston has been cancelled and replaced by the 299-5204 Piston .

The former parts and the new parts are listed in Table 1.

Table 1

Former Parts and New Parts
Piston and Rod Gp	Former Part	New Part
282-0645 Piston and Rod Gp	282-0644 Piston	314-5005 Piston
281-6139 Piston and Rod Gp	278-0247 Piston	299-5204 Piston

The new pistons are adaptable to all 3500 Machine Engines. Serial number effectivity is listed in Table 2.

Table 2

Serial Number Effectivity
Model	Serial Number
785C	S/N:APX01524-UP
789C	S/N:2BW01402-UP