JD 310A help

[anlricks]

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.

 

[bill onthehill]

There are a number of threads on here about this problem. they use a pump to supply fluid from the reservoir to the main hydraulic pump. I will see if I can find one of the threads.

 

[grandpa]

Yes the 310A does have and internal transmission pump and a bad pump would cause the machine not to move. Replacement of the pump requires splitting of the machine to facilitate the replacement.")