I have Terex TC50 excavator, ser # 0219. machine operates & works good for 15 - 20 minutes until oil warms up to operating temp. It then starts to slow down operating speed and will quit operating or track motion. It acts like the pump is deadheading as it will drag the engine rpm's to a stall if hold a function for a moment. When the machine cools down it will work for 15 - 20 minutes and quit working again. Anyone have any ideas on what to look for? Thanks, Terry
First I am not familiar with this machine , but it sounds to me that you might have a plugged oil cooler, and when the oil warms enough to close the thermostat it cannot flow.
Weak main relief valve would be my guess.... It's supposed to have a variable load sense pump system according to the brochure, so the pump will stroke up far enough to maintain a margin above load pressure. If the relief pops open, and you have a function engaged, the pump will shift all the way to it's maximum trying to keep up with the bypass and bring the pressure up to standby. Now I have no idea where your main relief is, but it's time for some pressure checks.
Yes, good advice. Also, if you keep running it as is. The oil is likely to get very hot. And that oil will become very expensive for you