first time mowing with this setup?
Nope, double checked the originals and made sure when replacing. I will certainly check again next time I pull the deck.Were the blades on upside down perhaps?
No problem, here are answers!How low is your mower set?
And are your running your mower at 540 rpm?
In your photo, that build up in your deck is not from a recent mow. It's been there for a while.
Standard blades shouldn't be mulching the grass.
Also have you tried raising the grass chute while its running?
Not trying to offend, just trying to troubleshoot.
Underside looks like it has the anti-blowout kit but that is it. Can be seen in the picture.Ok, is it possible that the previous owner had a mulching kit on it, and didn't remove the mulching baffles that surround the blades?
That would tend to keep the cut grass in the deck and stop it from being thrown out after being cut.
Maybe you could treat the deck with some type of Teflon coating that would help keep the grass from building up.
Deck measures pretty much the same as the 54C deck and the 60" deck and is very similar in design to the 60" I run on another tractor. I don't discount it may be a poor design but I get almost no discharge. It acts like it is in full mulch mode!That deck looks fairly shallow so it makes sense that it can't expel all the clippings. It also looks like you might be cutting in damp or muddy soil. That certainly doesn't look like thick green grass to me.
Mower blades are different at this point and seems to be the only obvious thing. Ordered some Gators for this one to see what happens.At this point, I would try and do a comparison between the two decks. If there both decks are 54 inch decks, and both are about the same depth, then something must be different. Are the mower blades the same on both decks?
Do both decks have the blow out kit?
If only one has it, then try removing it.
If you meant the flat areas at the rear of the deck, that can't be removed as it is part of the deck.I'd remove that skirt around the bottom of the deck. Sounds like it is starving for air to move the clippings out.
PTO idea is interesting. Nothing indicates it's not working correctly but certainly is a possibility.Another thought would possibly be a slipping pto clutch? Regardless of engine rpm a slipping clutch would cause low blade speed. If you had a photo tachometer you could check the deck driveshaft rotational speed at the pto setting which should be ~ 2000 RPM.
Does the deck have a model & serial number tag on it? We could check compatibility. There's a slim possibility it might not be the correct application for your 4100. Any chance the blades are turning in the wrong direction?
Blades are what JD parts book calls for and have been replaced with new ones.At this point I'd check
All belt routing and or slippage.