hope someone can help. I have a 644g and after working it for about 30 mins,and warming the oil up. The boom hydraulics seems to chatter and it has a hard time lifting the bucket at low idle. It really makes the loader jump. At the same time the park break light comes on and throw the loader into neutral. Both of those thing come and go. But happen more frequently when it get warmer and warmer Already changed the all the filters. Checked the pumps. Put a psi gauge on priority valve. It holds steady at 3000psi
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