Grass build up

[Mtsoxfan]

What model is it? I have a CC ZTR (Ultima ZTXS 5 54), but don't have holes like that on mine.
View attachment 3804325
Have you always owned the machine? I wonder if the spindles have been replaced and there are parts missing, or maybe wrong spindles?

Mine gets a TON of grass built up on top of the deck, but the belt guards are open on the sides, so it's pretty easy to blow it off with the air gun.

2023 ZTS1 50" cut. owned since new. Right now, I'm cutting lawn without pully guards, and it still collects, but not nearly as much. I've used a leaf blower, and as powerful as it is, it is difficult to get the bunched up, compacted grass out. Cutting about 2 1/2 acres.

 

[Mtsoxfan]

As far as the uncut strips, mine developed those after a year or so. I took the time to level, front to back, side to side, as well as the anti scalp wheels, and it has taken care of issue. (this was after my wife ran over a piece of 1/2" 18" tall rebar boundary marker pin) Didn't see or hear it???