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Thank you very much! I will check on this in the next few days. Also, I ordered the shop and the parts manuals this morning.

No...still working on it. I thought everybody had given up on my problem. I mowed (bush-hogged) with it Friday. I used it in manual throttle and cruise control. As long as cruise control is all the way forward...no problem. When you pull the cruise control back, the problem is there. But, when I...

Is there any way to test the Auto Throttle Advance?

The L3240 in question is open cab rops model no AC. Today I again worked it until it got warm enough to act up. I tried it in low- medium and high, same problem. I tryed it with auto throttle and manual. In manual it worked as it should. In auto it has the problem except going in reverse or...

For example: if I am trying to hold it at 2.4 mph, if the engine is cold, it stays right there. Once it gets hot and starts acting up, it will be 2.4, then 1.9 mph.

Drained the fuel tank. Put new diesel in it. The tractor still has the rpm problem, after it warms up. It only does it when the tractor has been used 40 mins. or so. Any more suggestions?

We will try that. It is getting low on fuel, so I may just drain the tank and see what happens when new diesel is put in it. It is worth a try. A fella said maybe it is a forward solenoid on the HST pedal. I hope it's the fuel!!!

Also, the hydraulics and transmission seem to be operating fine.

Also, the hydraulics are working fine. The transmission does not seem to be slipping.

Today I replaced the fuel filter. Plenty of fuel entering fuel filter. The tractor still has the rpm problem. Removed the gas cap. That did not help. There is no 'error' message on the panel. Drove the tractor. The varying rpm problem does not occur in reverse or in cruise. Only happens in...

I'll try that and see. Hopefully that is the issue.

Seems more like hydraulics.

It occurs no matter what I am doing. It only happens after the tractor is used for like an hour or so. It doesn't seem to occur in reverse. But, it does do it in cruise and forward. I didn't think it was doing it in cruise, but I checked that today and it does have the problem in cruise also...

After using my 3240 for 30-45 minutes, the rpms go up and down.:( It has a hydrostat transmission. Does not do it in cruise. Any suggestions as to what my problem is?