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Hydrolic tank heats up onJCB 525-58?

Tank heats up after using vehicle for couple of hours and all hydrolic functions slow down to almost stop. Machine all ok once oil cools down again.
p tabrett, June 2011
Could be one of these
Pump worn
Sticking MRV
Hydraulic oil comtaminated with diesel
Does steering and fan also stop as off seperate pumps

fix-a-jcb.com, June 2011
link Click here to see other fixes for JCB 525-58.