SUPPORT AS 8R0640 - Caterpillar

Introduction
The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution stat is identified below.Problem
Intermittent 681-4 and 681–6 diagnostic codes have been reported on certain track-type tractors. The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution stat is identified below.Solution
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.
Return any parts changed as a result of troubleshooting, through Send It Back (SIB).
Illustration 1 g06320201Provide any additional information such as items below.
Temperature
Indications of moisture
Other abnormal conditions
Measurements of operating temperate taken from the solenoid coil during operation. See Illustration 1.
Pedal position sensor and limit switch are checked for proper operation and alignment. Misalignment of the pedal can result in a 681-4 diagnostic.If you have any of these symptoms or additional information, provide the information to your Dealer Technical Communicator (TC) along with this Technical Information Bulletin (TIB) and CPI Number 407899. Request the Dealer TC to submit the information through CPI Feedback within the Service Information Management System (SIMSi).