Can anyone tell me the differences between the M4700 and M5400 engines?

[newbury]

Looking at the specs the M4700 uses a F2803-LA and the M5400 uses an F2803-A.
Note the differences in HP, PTO HP, and Torque



From reading the WSM I have about the only differences I've found is in coolant capacity and hydraulics.

However I've only MOST of the WSM because it got soaked due to a roof leak and some parts were just a blur.

So I'm wondering if I could just "tune" something up if I wanted about an extra 19% PTO HP.

Anybody know?

I'm not wanting to "roll coal" but if the engine can do almost 20% more stock I might try to tune it up.

 

[scdeerslayer]

Turbo?

 

[MHarryE]

Not much info on the Web because of engine age. Could be as simple as pump setting. Coolant capacity is a hint - the extra power results in extra heat rejection and a larger radiator. After that question is whether there are additional power train changes to where the 4700 power train cannot handle the extra power. That seems unlikely - added cost for design and parts difference for only a 5 HP difference cannot be justified. May be possible to have a injector pump shop turn it up unless you find someone who knows the right screw to turn and how much to turn it.

 

[rbargeron]

There's no guarantee that the power listed in sales brochures will actually be available in the tractor you buy. The 2.7L 5-cylinder F2803 was used in different models. For instance my L5450 has a F2803-DI that is "manufacturer-rated" at 59.5 hp. It has enough grunt for the ways I use it but I don't know if it actually has more or less torque than any of the four M-series models that also use the F2803.

Fuel pump setting is important - but the available adjustment range isn't a lot. Don't expect more than a few percent, if that. I always thought my L345 was a little anemic - it wouldn't quite maintain speed in high coming uphill on our road. I turned up the pump a bit and it made just enough difference.

If you have a situation where your max power is close but just shy of what's needed, adjustment might work. At full load and engine rpm, there should be slight wisps of black smoke (unburned fuel). Adjusting for more fuel won't be the answer there - it will just be wasted. But if you engine never makes black smoke at full speed and load, there may be some margin left in the way its adjusted now.

Good luck, Dick B