08-18-2010 05:30 PM
We just bought a used Cat 416 Series II Backhoe for farm use and after getting it home realized it was not all we thought it was. When you first start the engine from being cool (engine is perfect) all of the hydraulics work fine. Front bucket lifts and dumps, back bucket does all it should. But after only a few minutes the front bucket slows to a crawl and no longer has even enough power to lift at all, though it will still dump and scoop. The rear bucket slows down significantly, it is still operable but lacks any real power. It has plenty of fluid and the filter looks good.
So I was wondering if anyone knew what the problem could be? We are looking into getting a new pump but that is a costly endeavor and if it something simpler and cheaper we would much prefer that fix.
08-18-2010 09:25 PM
You might not have the correct oil grade for your local ambient temperature. If the machine performs while cold and as it warms up things start not to work, the first step should be to check the oil grade, if thicker oil does not help you might have worn components. How many hours does the machine have?
08-21-2010 03:57 PM
Those machines have a complex resolver network that signal the pump to upstroke. With a machine that old they may need to be resealed. I have done several of them, the seal get old and deteriorate. Be carefull not to lose the little ball in them, it will not work right if it is not there.