I have a 2019 Cub Cadet XT1 (model: 13A9A1CS056) that has been experiencing some power loss under load, especially after mowing for a bit (~30m ~ 1h). It struggles to move as fast as when I first got it to and will hardly move in reverse.
This is most noticeable when making a sharper corner with it completely failing to finish the turn at one point. Same goes for a minor incline, it got stuck where it previously has not. A few times it has felt "jerky" where it will lose some power then have a few small jolts until eventually the power partially returns and I can continue mowing. During this time the engine does not seem to struggle or make bad noises.
It seems to be having the power-loss issue only under load and drives mostly fine without the blades engaged (still a little slow in reverse).
This mower contains a fuel injected 547 cc OHV vertical shaft engine and a Tuff Torq hydrostatic transmission (see manuals tab in link above).
Here is what I've tried so far:
- Check air filter -- Looked fine
- Check belts -- No sign of damage
- Bad fuel? -- Ran it completely out and refilled with fresh gas. Doesn't have a fuel filter.
- Oil/oil filter? -- Just changed
- Hydrostatic transmission fluid -- Seemed a little low, topped it off with manufacturer recommended oil
- Dry grass preventing travel of the speed control rod -- Common issue, and I cleaned it out
- Mower deck dirty -- Cleaned off the caked on grass with included hose adapter
- Something stuck? -- Did the good ol' fashioned go in reverse then slam to forward (maybe that just makes things worse). Also tried a bunch of quick taps on forward and reverse. The taps seem to maybe help temporarily, hard to say.
- Bypass rod? -- Inserted all the way
Here are things I'm suspicious of and would love any input/advice:
- Could any of the belts be slipping or damaged?
- Are any of my pulleys stuck/too tight or something similar?
- Is my transmission busted?
How would I verify the above?
Beyond that I'm lost as to what it could be and would greatly appreciate any help!