My 1993 410D started blowing the oil line off the oil cooler .New fiber/rubber hose installed, ruptured again! Need cause suggestions?
The cooler might be plugged up after 30 years of use.
Does the hose blow off or rupture as soon as you start the backhoe or does it take some time to fail when operating?
When is the last time you changed the hydraulic filter. Oil cooler returns through filter on that machine I believe.