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From reading all the posts, it appears your problem is more likely hydraulics related rather than engine fuel supply. Do you have any hydraulic schematics? Your engine power is inadequate when something in the hydraulics causes a large load to occur and lifting the bucket gives the hydraulic...

White smoke indicates unburned fuel. Have you checked the air filter and induction system? Is the valve timing and valve size the same between the two engines? Smaller valves could limit air flow. Is there white smoke across the whole range of operation? Generators and compressors generally run...

I'm not familiar with your particular tractor but in general, if the fuel flow being supplied to the injectors is inadequate then the tractor will have difficulty providing power under load. Have you checked the filter head for clogging of the internal passages? Does your machine have a lift...

I contacted Kubota and they told me our M4500 was sold in 1978 but they could not tell me when it was manufactured. Thanks to all the folks who gave me advise on this.

I really wasn't looking for a Kubota but this one was really clean with a believable 2280 hrs and it's a real stout tractor for a Kubota. The controls are a bit strange compared to American tractors, but heck I can learn. I take it you got the date from the City of Columbus.

Power output in an IC engine is usually restricted by restricting fuel flow or airflow or both. First check the air filter for restriction. That's relatively easy. If that checks out as OK, then check fuel delivery. There is usually a strainer in the fuel tank at the outlet. Condensation of...

It takes fuel and air to make power in an IC engine. Low power in a diesel usually means restricted fuel flow or restricted airflow or both. Clean fuel is a prerequisite for a diesel. One of the biggest fuel problems in condensed water in the fuel tank. You can't see it happening but it does...

I just purchased a M4500 tractor with 2280 hrs on the clock. I know they were built between 1977 and 1985. My serial number is M4500 - 10018 but I can't find a correlation between the serial number and the year of manufacture. Can any of you folks point me to this info? Thanks in adance