2006/06/26 Caterpillar

Track Feller Buncher:

1090Series II (S/N: BZJ2110-UP)

1190Series II (S/N: BZK2160-UP)

1190TSeries II (S/N: BZL2110-UP)

1290TSeries II (S/N: BZM2260-UP)

511 (S/N: 5111-UP)

521 (S/N: 5211-UP)

522 (S/N: 5221-UP)

532 (S/N: 5321-UP)

Service Magazine, SEPD0843, 26 June 2006, "A Check Valve Has Been Added to the Pilot Lines Group". Disregard this article. See the replacement article that follows.

Description of Change: Leakage through the pilot pump can cause boom cylinder drift. The addition of a check valve and an elbow will eliminate leakage through the pilot pump.

Adaptable To: The addition of a new check valve and elbow is adaptable to the machines that are listed above.

The change is effective with the following machines:

Table 1

Machine Effectivity
Sales Model	Effectivity
1090	(S/N: BZJ2110-UP)
1190	(S/N: BZK2160-UP)
1190T	(S/N: BZL2110-UP)
1290T	(S/N: BZM2260-UP)
511	(S/N: 5111-UP)
521	(S/N: 5211-UP)
522	(S/N: 5221-UP)
532	(S/N: 5321-UP)

Illustration 1	g01280948
Location of the elbow and check valve (1) 148-8370 Elbow Assembly (2) 185-4026 Check Valve Group

The 148-8370 Elbow Assembly (1) and the 185-4026 Check Valve Group (2) have been added to the 272-0058 Pilot Lines Group.