I have a 2003 B7500 with about 1500hrs. I bought it in 2016 and I use it for mowing and spraying with a PTO powered Arbus 200. Each summer, the kids overheat the engine at least once when mowing in hot weather. Two summers ago, the tractor would lose power if the fuel level dropped below 1/2 tank. A month ago, the tractor was running rough, would not hold set power, dropping RPM toward idle then coming back up. I checked the oil and the crankcase was full of diesel fuel. I assumed the injection pump was leaking so I replaced it. That didn't fix it. Turns out the diaphragm in the lift pump ruptured and was causing the fuel in the crankcase. I replaced it, too.
The tractor is still not holding set power, even with no load. It starts just fine, but will not hold 2000 RPM. If you watch the video in the link, you can hear it surging and falling. The throttle lever is stationary during the entire video but the RPM is all over the place.
After making the video, I tested the compression. Results are, fore to aft: 450, 405, 401. Pictures of the compressions are in the folder, too.
I have removed the tank and cleaned it out. I replace the filter housing and filter. The fuel flows freely to the lift pump. If I crank the engine, the lift pump push lots of fuel to the injection pump. I've check the entire fuel system and I don't see any restrictions or blockages.
I'm out of things to trouble shoot. Any suggestions?
Here's a link to a folder with pictures and videos: https://photos.app.goo.gl/bDcxLJ53fnntNvN56
The tractor is still not holding set power, even with no load. It starts just fine, but will not hold 2000 RPM. If you watch the video in the link, you can hear it surging and falling. The throttle lever is stationary during the entire video but the RPM is all over the place.
After making the video, I tested the compression. Results are, fore to aft: 450, 405, 401. Pictures of the compressions are in the folder, too.
I have removed the tank and cleaned it out. I replace the filter housing and filter. The fuel flows freely to the lift pump. If I crank the engine, the lift pump push lots of fuel to the injection pump. I've check the entire fuel system and I don't see any restrictions or blockages.
I'm out of things to trouble shoot. Any suggestions?
Here's a link to a folder with pictures and videos: https://photos.app.goo.gl/bDcxLJ53fnntNvN56