Cat 300 running hot on gradea
In 90+ weather when pulling a long grade my 05 Bounder 34m with a 300hp Cat will run in the hot on the guage and the yellow light comes on, I will down shift and let up on pedal. When top of pull it c...
Forum Discussion
OLYLEN wrote:
If memory serves your best cooling RPM is at 2200 RPM. Settle into a gear that allows the 2200 RPM then you can start playing in that RPM range with and up shift or speed up a touch to see if it stays cool.
LEN
Depending on HP rating, the peak HP on the 3126 is between 2200 and 2400 RPM.
Totally agree that RPM needs to be toward the upper end of the usable RPM range, but with peak torque at 1,440 RPM, IMO 2000 is a good compromise between cooling and fuel consumption (higher RPM= more fuel consumption).
If 2000 RPM at less than wide open throttle overheats, determine the cause and fix it.
#1 cause is blockage of the front of the CAC
#2 cause is slipping V belt-- on that engine there is a separate V belt that ONLY drives the water pump. It is MANUALLY TENSIONED.
#3 cause is one or both of the thermostats (Caterpillar calls them regulators) hanging up/not opening fully. Yes, some have a single thermostat, some two. Any Caterpillar dealer can get you the correct ones (and a gasket) from your engine serial number.
