Air To Air After Cooled (ATAAC) Fan Motor Can Stall, Causing Loss of Cooling to ATAAC and HVAC Systems On Certain Series C Articulated Trucks {1386, 5061} Caterpillar

Articulated Truck

725C (S/N: LFB1-UP; TFB1-UP)

725C2 (S/N: 2T31-UP; 2L61-UP)

730C (S/N: LFF1-UP; TFF1-UP)

730C EJECTOR (S/N: LFH1-UP; TFH1-UP)

730C2 (S/N: 2T41-UP; 2L71-UP)

730C2 EJ (S/N: 2T51-UP; 2L81-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the following solution.

Illustration 1	g06005374
View showing location of ATAAC fan motor at the front of machine (1) ATAAC fan motor

Illustration 2	g06005041
View showing ATAAC fan motor and fan (1) ATAAC fan motor (2) ATAAC fan

Problem

Leakage of hot oil through the ATAAC fan motor can occur when restarting the machine after a hot shutdown. This leakage will cause an insufficient pressure/flow of oil to the ATAAC fan motor during machine operation. Insufficient pressure/flow of oil will result in a stall condition of the ATAAC fan motor. A stalled ATAAC fan motor will result in the loss of cooling to the ATAAC and HVAC systems.

Solution

Replacement of the ATAAC fan motor is required if a failure is caused by leakage of oil.

Illustration 3	g06005053
View showing a certified ATAAC fan motor (3) Green sticker

Replace the ATAAC fan motor with certified ATAAC fan motor, that is identified with green sticker (3), as shown in Illustration 3.