Bogging down

[K95150]

ok, I’m running a 6’ woods finish mower on my 8n for the first time. It’s got all new blades belts etc. tractor is 12v just had plugs, cap rotor points etc changed. It bogs down when I start to cut with it. Better if I raise it up a little but the mower is already set on the highest cutting. Running it almost full throttle it doesn’t have a tach so I don’t know what the rpm’s are. Any suggestions?

 

[DanielW]

Full throttle (or almost full) is about where 540 is on these tractors (unless you have the Sherman step-up), so you're running it at the right speed. I'm not sure if there's much more to it than being a big load for a small tractor. What are you mowing? If it's just slightly tall, lawn-type grass you can probably do ok. For taller grasses or tougher materials, it could easily be too much for a 6' finishing mower on a 25 HP tractor.

Rotary mowers (both bush hogs and finishing motors) and the power they use is very dependent on ground speeds and crop types. There's lots of folks who are running 5' bush-hogs on their N's trimming pasture or lawns. But when we're in doing some heavy thinning or thick, reedy weeds and heavy grass, a 6' bush-hog will bring our 70 HP Ford 6600 to its knees.

If it's light grass, I think an 8N should probably handle it ok at lower ground speeds. If it's not, the only other thing to check would be your carb settings.

 

[Duner Wi]

Full throttle for sure. How tall is you grass? First gear? Take less than full swath after first round.
I mow with 5 foot Woods and 9N. Sharp blades make a difference.

 

[Jim L WA]

K95150, your first post said it was sputtering with no load and under load. Now you say it's bogging down under load. If it's sputtering, it's not getting all the potential horse power. If the points gap is correct and the distributor is working right, then I think your carburetor is at fault.
I don't know how to make a link, but check this article out or show it to your mechanic when he returns from vacation.

https://forums.yesterdaystractors.com/threads/9n-stalls-on-hills-greater-than-15-degrees.1761064/#post-11478560

 

[Eman85]

70+ yo tractor that wasn't a powerhouse when it was made. I read your other post and "completely restored" leaves a lot to wonder about. Also about your mechanic that returned a tractor to you that couldn't even go onto the trailer without sputtering. I would want to start at the very beginning with a tractor like this. Before putting plugs in I'd want to do a compression test and a fuel flow test, 2 of the simplest tests that no one wants to do.