Posted by Robert Hasserd on December 08, 2007 at 05:24:57 from (98.197.156.61):
I am working on a 674 and I got the tractor with no hydraulics operating except power steering. Changed out the filter ( not to dirty )drained all oil and replentished it, still no operation of the front end loader. Removed the valve plate on the side and replaced hydraulic pump ( worn bad ). pulled out all valves in plate and resealed them, reinstalled all parts and still no hydraulics except the 3 point hitch will go up with no control and the pto shaft will not rotate. After the engine is off the PTO will turn but only 90 deg. in either direction.I removed the dump valve under the seat and changed out all seals and verified the valve works freely, and just in front of the dump valve is a plug with a pressure reg. type spring assembly and upon removal the plug shot out under pressure with the engine off.I feel there is a valve stuck or hung open because there is no flow to the front end loader valve body at all, and the line feeding the dump valve is getting hot. Can you help me with some tips or show me where to get a power flow chart/diagram of the hyd. system please. Thanks in advance, Robert-----
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