2008/09/29 Caterpillar

Articulated Truck:

725 (S/N: AFX1-UP; B1L1-UP)

730 (S/N: AGF1-UP; B1M1-UP)

730 EJECTOR (S/N: B1W1-UP)

Service Magazine SEPD0963, 20 October 2008, "A Check Valve Controls Oil Distribution To The Cooling Fan". Disregard this article. See the replacement article that follows.

Description of Change: A check valve arrangement can be added to the pilot oil control system for the fan and to the hydraulic circuits for charging the brake system. The arrangement for the check valve will prevent incorrect events of low brake pressure on machines that are operating in high ambient conditions.

Adaptable To: The valve and lines will help to regulate warnings for parking brakes and low brake pressure on machines that operate at higher ambient temperatures. Refer to the Special Instruction, REHS4059, "Installation of the 323-4207 Valve and Lines for 725,730 and 730 Ejector Articulated Trucks" for the proper procedure of installing the valve and the lines.

The check valve arrangement is available for installation on the following machines:

• 725 AFX1179-UP

• 725 B1L1-UP

• 730 AGF1092-UP

• 730 B1M1-UP

• 730EJ B1W1-UP