-------------------------------------------------------------------------------- I was offered a 310a backhoe today with a new engine. The owner said the hydralics were week so he had a new pump installed. When he got it back from the shop it ran for a day then stopped moving. He was told it had an additional internal pump that needed replacing. Before I buy it I would like to know if this might be the case or could it be something else. Any help would be greatly appreciated.
I'd advise checking the price of new JD parts for that machine first. I will not even consider buying an older JD hoe for that reason. There is a charge pump that supplies the forward reverse clutch packs, and the hydraulic pump also, as I recall. The hydraulic pump has to have a minimum supply pressure/volume to operate. I'm not sure if that tractor has to be split to get to the charge pump, but there are pressure checks that can be done and possibly a pump pick-up screen that can be accessed. Others on this forum have had experience with this, and I remember posts on that topic. Phil
hmmm...sounds like parts were thrown at the machine with no diagnosis.... I would ask: diagnosed how? and by who? and let me talk to them This chronic conclusion that "if the hydraulics don't work, it must be the pump" is going to cause a lot of good money to be thrown into a machine that could have something as simple as a failed $2 o-ring, or a piece of debris in a relief valve... or, if the first pump failure pushed metal debris through the entire system, it could need a lot of stuff... can't be solved on a message board The machine needs to be diagnosed by a competent tech experienced in hydraulics. Filter needs to be cut open, and basic checks need to be performed including a good visual inspection.
My dad has a 79 310A that was loaned to a neighbor who got it stuck in between I believe 2nd and 3rd H and broke a gear. The shifting fork was worn but if used attentively was serviceable until neighbor used it. Does anyone know where a parts machine may be located? Engine on ours has been freshened and except for tran. gear is nice old machine.
310a backhoe I got a 310 a, It had hyd trouble it was the bolts twist off on the clutch . so the trans would't have the same rpms.