My Husqvarna RZ5424 zero turn mower is sluggish on incline and even when taking off on flat ground, what could be wrong?

Question edited for clarity.
Question moved from Cars and Trucks to model category.

This says 'Kawasaki' but they might mean Kohler.

https://www.manualowl.com/m/Husqvarna/RZ5424-Kawasaki/Manual/329467?page=51

More here

https://www.google.com/search?q=husqvarna+rz5424+switch+wiring+diagram

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Question edited for full 'make model (what is is)'. Question edited to remove funky punctuation 'word - space - comma - new word.
Question moved to model category.

That sounds like fuel starvation to or from the carburetor. Enough fuel to start it, but not maintain it running.

https://www.google.com/search?q=husqvarna+rz5424+stalls

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It is more than likely built in to either the clutch itself or the wiring to the clutch.

are you sure its the starter and not the solenoid? or a loose ground?

There is not an "adjustment" tension is held by an idler pulley. If the belt is too loose, you must change it.

ether unplug it if wont start then jump the wire pigtail with a wire you can bypass both switch like this

Where is the grinding sound coming from??? Could be your hydrostatic transmission. When one side goes the other will follow... Time for a new mower... Mine lasted 3 years...

Have you checked for stones, twigs, dead squirrels, etc. In the drive gear and wheels?

Throttle should be at full speed to deliver max power. Make sure your air and fuel filters are clean.

I have a 2014 HUSQVARNA RZ5424 that I just changed the blades on for the first time now 2017. I got new gator blades because of all the good reviews on them. They are about as good as a screen door on a submarine at 300 feet deep. There the same length as the original blades but leaves two rows of uncut grass about a inch wide regardless of how you try to cut it. Only 240 hours on mower, deck clean ,spindles kept greased . Went back to new Husquvarna blades like the ones made for it. PROBLEM SOLVED. HAPPY HAPPY HAPPY. REL.