Re: JD2030 Lift Problem

Posted by David on July 14, 2002 at 13:10:15 from (62.252.128.6):

In Reply to: JD2030 Lift Problem posted by Simon on July 13, 2002 at 15:29:31:

I restored a 2030 here in the UK and had so many problems with the hydraulics afterwards I can just about take it apart in my sleep. The reason (probably)it works for a bit before failing to work at all is that there is a 1 gallon oil reservoir just above the main pump in front of the radiator. It will operate until that has been drained then stop until the reservoir is refilled again. What refills it is a transfer pump in the front of the gearbox (the transfer pump is internal and can't be serviced without splitting the tractor). The transfer pump is probably ok and you should change the main hydaulic filter first as this may be restricting the flow of oil from the transfer pump to the main pump. Its in the cannister (under the footplate on the lower right of the tranmission casing) You can just unscrew and and let what oil is in it run into a container. You don't need to drain the transmission as it will only lose what's in the filter itself. There is also a strainer that prefilters the oil BEFORE it goes to the transfer pump. That could also be clogged and tends to get forgotten about. You do need to drain the rear end to clean it. It is located across the width of the transmission casing just in front (or maybe behind) the hydraulic filter. Its is identifiable by a large hexangon headed plug at either side of the housing. If you take these out wou can withdraw the strainer element and clean it. You can check the oil flow from the transfer pump by detaching the pipe supplying oil to the front reservoir and checking what sort of flow you get from it.

It is very important that the hydraulic filter is clean as the oil that goes through it does more than just work the hydraulics. We burnt out the PTO clutch (oil immersed!) on a SAME 65 through sheer neglect of the filter. We knew it was blocked as the power steering also wouldn't work right but just ignored it a bit too long. It also provides brake and transmission lubrication too.

One interesting design feature at least on the UK 2030s was that the main pump has a capacity of 11 gallons per minute but is fed by the transfer pump that only had a capacity of 6 gallons per minute. The effect is that if you're using oil continuously (like a hydualic motor would) you run out of oil quite quickly and the motor slows down. I searched for the cause of that apparent "fault" for weeks and stripped the hydraulic system several times to figure out what was wrong. Eventually I read the Operators manual (always a last resort) which instructed me to take the return oil back into the bottom of the hydraulic filter housing when using hydraulic motors(some cannisters have a tapping provided for this purpose) This returns the oil directly back to the main pump inlet and avoids the oil starvation problem. I know some of this isn't your problem exactly but may of some general interest anyway.

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