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I own a B2700HST( basically the same tractor as your B7800) that I purchased new in 1999. The power curve of a diesel engine is much different than a gasoline engine. Best to operate the diesel at it's torque peak which is slightly below the rated speed. In general, whenever I engage an implement such as a mower or brushog, I do so at idle speed to avoid shock loading the equipment's driveline and abusing the tractor's clutch. Once the device is engaged I spin the engine up to the recommended 2500-2600 RPM and let the blades catch up before moving off. When working with the FEL I generally keep the RPM at about 2200 and use the M range in the transmission. For very heavy loads I might use L on the trans. Low RPM when using the loader is very hard on the engine and pump, you want to keep the hydraulic pressure up to the rams that lift and articulate the bucket so you have the maximum mechanical advantage over the load in the bucket. These B series Kubotas are as reliable as a hammer. Just change the oil and hydraulic fluid as recommended and grease the fittings regularly and the machine will outlast you.

Kubota B7800 HST correct operating RPM speed
Kubota Tractors
Replies 35 Post by hemrich@att.net