The Temperature Variable Control May Fail on Certain 773G, 775G, and 777G Off-Highway Trucks {7309, 7343} Caterpillar

OEM

CAT WDS (S/N: M6J127-UP)

Off-Highway Truck/Tractor

777G (S/N: GT7190-UP; T5A1-UP; TNM1-884,1000-UP; RDR1-385,510-UP; T4Y1-210,511-UP)

Quarry Truck

773G (S/N: MWH1-UP; JWS408-UP; T5S126-UP; T5T1-UP)

775G (S/N: T5F103-UP; RFM1-UP; MJS614-UP; T5W1-UP)

Introduction

The problem that is identified below has a known solution. Use the solution that is identified below.

Problem

Unable to adjust cab temperature on certain 773G, 775G, and 777G Off-Highway Trucks.

Solution

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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

Caterpillar is aware of this problem and recommends the following interim corrective action.

Replace 238-8841 Control Valve As with improved 521-2576 Control Valve As and a 522-2362 Kit-Valve. Refer to Special Instruction, M0080228, "Procedure to Replace the Water Valve for the Heater Coil on Certain Motor Graders" for information on replacing the water valve.