JCB JS130 Engine problems need help

Hello,

I am having engine problems with my jcb JS130 Excavator and was wondering if anyone could help me find out what the problem is.

when the engine is warm it looses power but is chucking out black smoke. if you leave it to cool down for 30 mins it will be ok for 15mins then it will start loosing power and smoking again.

I have already tried changing the diesel filters, flush the tank out, and bleed the system out.

any help will be great

thanks steve

JCB JS130 Engine problems need help