Tractor Repair: Tractor Hydraulics, tractor hydraulics, kubota l3130

Question
I have a Kubota L3130 with kubota front end loader, at 50.6 hrs of operation, just before performing the first service, the front loader can not be raised and lowered unless you use the 1:30, 4:30, 7:30 or 9:30 position on the controller.  of course this also rotates the bucket at the same time.  The 9:00 and 3:00 positions to rotate the bucket work fine.  Uncoupling and recoupling the hoses and changing the fluind and filter has not helped.  There also appears to be a new buzzing sound from the tractor.  The tractor is equiped with hydrostatic trasmission and an excavator on the 3 point, all of which work fine.  Any ideas would be appreciated.  If the coupling in the hydraulic control needs replacing, please advise on this procedure.

Thanks

Clive Baron
Torono, Canada

Answer
Clive if the tractor is such a new unit with these problems I would call the dealer that sold you the tractor to fix it as it sounds like a warranty probem.
The buzzing you can here to me sounds like the pressure releif valve is blowing off and this could be the problem with the front end loader.
with the way the control works 1.30 4.30 etc I can not work this one out sorry Clive but as above look at the dealer for help matey.




                   Regards Danny Last