Rookie needs advice: Low revs? Kubota B2710

muzzleblaster · Jun 5, 2005

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I'm a new tractor owner and my new Kubota B2710HST has 6 hours on it. I've mowed my place twice pulling an Industrial 60 inch finish mower. I'm supposed to run the engine at 2600 RPM to get the rear PTO up to the required 540 RPM. Since I'm new to tractoring, I've been puttering around concentrating mainly on safety and not on speed. But today, I pulled the throttle all the way to the bottom and all the engine will do is 2500 RPM. At 2500, engine sounds like it's running smoothly. No abnormal noises or smoking. Puzzling, because the first time I mowed last weekend, I was able to get the revs higher than 2500 . . . maybe 2650 or so.

Clues:

1. I popped the hood and looked at the throttle linkage. When the throttle lever is pulled to the bottom, the throttle linkage is pushing the linkage going into the engine fully forward to the stop. So that's probably not the problem.

2. Last weekend, I bought fuel at my local Citgo station. I put "road diesel" fuel into my tank last weekend and left it full all week. Same fuel as goes into diesel cars. I used a tractor funnel with a screen strainer to make no trash went into my tank.

3. Engine has 6 hours on it and the fuel filter looks clean.

Is this "normal"? Should it rev higher than 2500? Or does it have a governor of some sort?

The Kubota owners manual doesn't address this directly, but says that low power means trouble in the fuel system (filter, lines, etc.) But it mows fine at 2500 and seems like it has plenty of power.

I've never owned a diesel or a tractor before, so any advice would be appreciated. Thanks.

MarkLeininger · Jun 6, 2005

I have a 2710 but it only has 10 hours on it so I haven't tried to run it full throttle. I've only used the FEL so haven't had a need to run faster. I might run it tonight if I get home in time. If so will let you know what max rpm is.

fishman · Jun 7, 2005

I would contact your dealer. It sounds like the throttle isn't adjusted correctly. Likely a very minor problem from what you describe, but one that needs correcting.

muzzleblaster · Jun 7, 2005

Thank you Fishman. Do you think that the 2500 rev limit is a problem that requires urgent attention, or can it wait until my 50 hour maintenance visit? I'm at 6 hours now. Thanks again for the response.

fishman · Jun 8, 2005

In my opinion a difference of 100 rpm isn't that big of a deal, particularly if you are using the tractor for things other than pto tasks most of the time. That is, as long as it's simply a matter of adjusting the throttle. I believe I would still call my dealer, explain the situation, and let him make the call. Again, it probably isn't something urgent.

muzzleblaster · Jun 8, 2005

Thanks again for your reply. I went to the dealer today and he showed me where to make this minor adjustment to the throttle travel. After pulling the right access panel off, there is a throttle adjustment screw on the lower right side of the engine block where the throttle linkage connects. The dealer suggested that I loosen the locking nut and then loosen the screw that controls the amount of travel allowed on the throttle linkage -- this adjustment will allow the throttle to open a little more. Dealer suggested that I adjust so that my max RPM is 2700 - 2800. I'll let you know how this solution works.

muzzleblaster · Jun 8, 2005

Success! /forums/images/graemlins/grin.gif It was a simple adjustment just as I described in the previous post. I even got some Bushhoggin' done tonight before dark, all at the right power level. Thanks.

Alan L. · Jun 8, 2005

As you have already learned, the linkage can easily be adjusted. I had to adjust mine one time myself and it was an easy job.

fishman · Jun 9, 2005

Excellent! Isn't it nice when a problem turns out to have a simple solution? /forums/images/graemlins/smile.gif

If your Kubota is anything like mine, you won't need to go back to the dealer for anything but filters and oil once a year. /forums/images/graemlins/cool.gif

freedogs · Jun 10, 2005

I'm a new B7800 owner (39 hours now) and I just came to this site looking for an answer to why my new tractor won't rev over 2300RPM now when it was easily making 2600 plus for bush hogging and tilling just last week. Glad I found you. How much adjustment did you have to do to the throttle linkage to get max revs back? BTW, I cruised this site before buying so many thanks to all Kubota owners who helped me make up my mind.