12-31-2018 10:07 PM
Any excessive leakage in the transmission and torque converter results in reduced oil flow through the cooler and therefore reduced heat transfer. If your machine condition is the same as machine in previous posts ( torque convertor known to be good and transmission pressure tests correct) and engine is not overheating as well then check the following:
1. Torque convertor inlet relief valve (ratio valve) dumping oil back to sump which reduces flow to torque convertor and cooler.
This valve is located in the transmission hydraulic control valves.
2. Seals on the sleeve tubes between hydraulic control valve and transmission housing
3. Internal tube in main case and frame that takes oil coming from transmission to the torque convertor
10-04-2013 03:09 PM
10-04-2013 02:33 PM
10-04-2013 11:42 AM
We also found this information from the OMM (Operation and Maintenance Manual) It suggests that
the oil level may be too high.
1. Note: When you are operating the machine on severe slopes, the
quantity of oil in the transmission can be increased up to 10
percent. When you are operating with the increased oil quantity,
prolonged operation in some machines can cause high transmission oil
temperatures. After the work on the severe slopes has been completed,
drain the excessive oil quantity from the transmission.
10-03-2013 03:31 PM
I work in Caterpillar's Customer Interaction Center and have spoken with some of our experts about your issue. They believe there may still be something in your powertrain system that is not operating correctly, or the operating technique could be improved. There are several possible causes, but here are some suggestions.
a. the gauge may not be displaying an accurate temperature
b. the oil flow to the cooler may be restricted by something such as a partially plugged or crimped oil line either before or after the cooler
c. the cooler itself may have internal flow restrictions caused by debris or some other cause
d. high powertrain oil temperatures can also be caused by operating in too high of a gear (trying to doze too large of a load in second instead of shifting to first gear, for example)
e. cooling is also reduced when engine RPM is decreased, such as when the decelerator is used or the engine is not run at high idle.
If this does not help your local Caterpillar dealer can work with you to help determine the cause.
10-02-2013 12:12 AM