2013/09/12 Caterpillar

Track Feller Buncher:

521B (S/N: F7B257-UP)

522B (S/N: F7C218-UP)

541Series 2 (S/N: F7D1-UP)

552Series 2 (S/N: F7G1-UP)

Service Magazine SEPD1664, 12 September 2013, "A Procedure to Adjust the Pressure of the Grab, Accumulate, and Wrist Control Valves on Certain Track Feller Bunchers Equipped with Certain Felling Heads Is Now Used". Disregard this article. Refer to the article that follows.

Description of Change: Adjustment of pressures for the grab, accumulate, and wrist control valves will allow the functions controlled by the valve to operate at the correct pressures.

ReferenceSpecial Instruction, REHS8942, "Procedure to Adjust the Pressure of the Grab, Accumulate, and Wrist Control Valves on Certain Track Feller Bunchers".

Adaptable To: This change is adaptable to the following machines:

• 521B (S/N: F7B257,260-261)

• 522B (S/N: F7C218,222,224-225)

• 541 Series 2 (S/N: F7D1-231)

• 552 Series 2 (S/N: F7G1-175)

This change is effective with the following machines:

• 521B (S/N: F7B262-UP)

• 522B (S/N: F7C226-UP)

• 541 Series 2 (S/N: F7D232-UP)

• 552 Series 2 (S/N: F7G176-UP)