2011/05/09 Caterpillar

Excavator:

308D (S/N: FYC1-UP; GBT1-UP)

Service Magazine, SEPD1277, 09 April 2011, "Improved Performance for the Travel System for 308D CR Excavators ". Disregard this article. Refer to the article that follows.

ReferenceSpecial Instruction, REHS5655, "Update Procedure for the Travel System on 308D CR Excavators"

Description of Change: New components improve the travel and hydraulic performance. The new spool for the travel control valve improves travel performance. The new components for the counterbalance valve improve the automatic speed control.

Adaptable To: Refer to the following tables for the required parts and adaptable machines. Refer to Special Instruction, REHS5655, "Update Procedure for the Travel System on 308D CR Excavators" for the procedure.

Table 1

Required Parts
Qty	New Part No	Description	Former Part No
Travel Control Valve
2	356-6924	Spool Assembly	324-7800
Travel Counterbalance Valve
2	366-9834	Spool	326-8955
2	366-9835	Spring	306-7929
2	114-8229	Plug-Orifice	326-8956
1	6v-8647	Adapter-STR	268-1601
1	3J-7354	Seal-O-Ring
1	4J-5477	Seal-O-Ring

Table 2

Effectivity	Adaptability
S/N:FYC1558-UP	S/N:FYC1-1557
S/N:GBT509-UP	S/N:GBT1-508