Zero Turn power

[redneck1952]

I have a Toro zero turn ZX4800 that loses RPM when the blade is engaged. It will not handle heavy grass at all. The fuel filter, fuel pump and spark plug has been replaced with zero effects. The mower has always had treated gas to keep the carburetor clean. Removed carburetor and cleaned it, when I tore the carburetor apart I did not find anything noticeable wrong with it but cleaned it anyway. Noticed that the spring controlling the fuel on the carburetor was getting weak and replaced it. Kinda at a loss on what might be causing this. Does anybody have any ideas on might be causing this?

 

[jthibodeau89]

Check deck for bad bearings and belt drag.. All spindles and pulleys should turn freely with very little drag.

 

[redneck1952]

I replace all spindles last year, they spin free.

 

[redneck1952]

Check deck for bad bearings and belt drag.. All spindles and pulleys should turn freely with very little drag.

also replaced 2 pulleys on the mower deck

 

[jthibodeau89]

Belt routed correctly? Gear box turn free? Drive dhaft u joints free? From what you describe, something in deck drive is sucking HP.

 

[redneck1952]

you can't route the belt wrong and have it fit.
no gear box, direct drive off the engine.

 

[jthibodeau89]

Belt over or under one of the keeper pins at the pulleys?

When did issue start? If motor loses rpm when deck is engaged, sounds like a deck drive related issue. Electric pto clutch ok?

 

[redneck1952]

that would burn up the belts, they are in pulleys the way they should be. All belt placement and pulley condition was checked before posting on here.

 

[jthibodeau89]

I tried to help. Does not sound like a motor issue. I assume ir drives okay with blades turned off?

 

[John0829]

Check the color of the spark, is blue or yellow? I know you said you have replaced the spark plugs but that won't fix weak spark if that is what the problem is.