Engine RPM problem on my BX24

[DOC4444]

Vice Grips (be gentle)

DOC

 

[CHDinCT]

Glad you got it figured out, or at least think so. I would have had to run it immediately to find out for sure. On stopping the fuel during replacement, I used a couple vice grips to clamp the hose on either side. Stopped most of the fuel from draining out.

 

[rnbrn21]

The problem wasn't too frequent so running it for just a few minutes wouldn't have told me much. Well I got to use it quite a bit today and no problems so I think it is fixed.

 

[ibnxe]

Vice Grips (be gentle)

DOC

Don't know if Vice Grip still makes this type, but it is model RR and has rounded jaws. You still have to be gentle with it, but there is lass tendency to cut into the hose. I bought two of these thirty years ago and it makes filter change a breeze. Very little spillage.

 

[kovalenv]

I'm having a weird problem with my BX24. After I have been using it for about 45 minutes at a continuous high RPM while brush hogging a field the RPM's will suddenly drop off. It doesn't die it just drops RPM's to about 2000. When it happens I turn off the PTO and bring the RPM's down to idle with the throttle and let it idle for a minute or so and then bring it back up to high RPM's and go back to mowing. I can't imagine what would cause the RPM's to drop, anyone with an idea?

I have exactly same issue with Kubota BX24 and I changed gas filters, but it didn't help. What else coud be the problem?

 

[Leejohn]

Might be the fuel cap vent.

 

[anthonyv]

The fuel sending unit on these tractors have been known to rust out & clog the tank fuel line

 

[Tractor Seabee]

050 is the air bleeder screw

The BX models do not have a bleed screw as far as I can tell and none shows in my 25 WSM. Air is bled off through the return line to the tank. You just run the pump till the injector pump gets the fuel up, bleeds air automatically. Sure sounds like fuel starving. Partially plugged filters will act that way. The 24s are old enough that the booster pump may be weak as well as the injector pump if hours are high. 1500 HRs on my 25 and filter changing is a common chore, I keep a couple on hand. It is usually the one just out of the tank before the booster pump.

 

[Tractor Seabee]

I just replaced mine after barely 6 months since the last replacement (i posted about this about a week ago; I was suspect of the filters getting gummed up after such a short period of time). I think over time sediment can accumulate in the tank, and work its way into the lines. I'm planning on replacing mine on the same schedule for oil changes (which I do every 6 months or so).

On my BX 25 during the first 100 Hrs I replaced the fuel filters 3 times. Some kind of black gunk left as residue in the tank is my guess. Probably replaced the first line filter 3 time since with same symptoms the OP has. I had a similar problem with the HYD suction strainer and filter, black gunk.

Ron

 

[Tractor Seabee]

So I went over to the Kubota dealer today and bought 2 fuel filters because I didn't want to wait for the ones I ordered online. I was skeptical that that was my problem but it sure couldn't hurt. I started with the one at the engine and replaced it with little fuel spillage and moved on to the one under the tractor. I'm about ready to pull the hose leading up to the engine off when it occurs to me that gravity might cause a great deal of fuel to come out when I take this hose off but I decide to go ahead. I pull the hose off and get a slow but steady stream of fuel out of the filter and I think well this isn't too bad. The pull the hose off the other end of the filter and to my surprise I get a gush of fuel at the volume the hose can produce and quickly cover it with my finger. So there is no doubt in my mind that the filter was indeed very clogged and most definitely was my problem. Taking a closer look at the old filter shows it to be very dirty and when I drained it actually got particles coming out. I haven't used the tractor yet but I'm sure it solved my problem. Thanks to the forum for the diagnosis. How do you all stop the fuel from pouring out when you remove the filters?

After changing the filter 2 times I installed a valve ahead of the first filter. I also moved the engine compartment filter to underneath next to the first one (easy job).

Ron