L4330 3pt hitch wont raise up

[chieff]

I have an 04 grand L4430dt that I purchased new and it has just over 400 hours. I was using it today with a box blade and out of the blue it wouldn't raise the 3pt arms. I unhooked the box and with at least 1/2 throttle it would raise them, otherwise at idle it would not raise the arms, however my front end loader works great and is fast even at idle.

I had noticed recently that when I would start it up even with nothing on the arms they wouldn't go up unless I gave it a little throttle. I just thought it was due to the cold weather but today it was 60 degrees. I have always preformed the routine maintenance, kubota filters, udt etc. and the fluid level is spot on.

I changed the fluid back in the fall and have used it about 15 hours since with no real troubles except for the last couple of weeks when the arms were very slow to raise, however they still had power and would lift and implement. I did stand on the arms and with a good amount of throttle they would lift me, 200lbs but that seemed to be about all it wanted.

Anyone have an idea? Possibly a blockage? I did take very extreme care when changing fluid to keep everything clean etc. Also the fluid looks perfectly clean.

Thanks in advance

 

[dex3361]

Did you check the 3PH speed adjustment knob usually located between your legs and down near the platform?

 

[chieff]

Thanks for the replies. I checked the lift speed knob and it was in the middle position but on the 4330 that is only the speed at which it lets the arms go down. I pulled the seat and sheet metal it is on and checked the levers that go down to the valve and it all moves smoothly and seems to be fully operational. At this point I believe that I am going to have to take it to my local dealer. I will post when I know more.

Chieff