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Hi Good people, I have a sit on Husqvarna CTH151, had it serviced about a year ago, cant work out what's wrong, see attached picture. Basically its not cutting right, I've had it up on ramps and the blades look ok, removed some debris, took the collector off the back and tried it, seems like when you drop the deck to cut, in some circumstances the blades don't run right, they are just not cutting and there is no exit from the back, I tried different heights (Of the cutting deck) but no luck. Its a difficult one as its like 1/2 working, But its not right! Any suggestions would be appreciated?

Welcome
Full description of "Not Cutting Right" please

Thanks, I was trying to upload a picture but its too large see https://we.tl/t-Ae851Bz4gI. Hopefully you can see what I mean, basically the blades aren't cutting the grass, I mean you can see that the grass isnt fully cut like it should be. Only I think about 20% cut.

swagstaff said:

Thanks, I was trying to upload a picture but its too large see https://we.tl/t-Ae851Bz4gI. Hopefully you can see what I mean, basically the blades aren't cutting the grass, I mean you can see that the grass isnt fully cut like it should be. Only I think about 20% cut.

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So 80% of the grass you are cutting is not getting cut?!
Are the blades sharp? Are the blades loose? Are they the correct blades? Is the underside of deck free of debris? Did you hit so, and now it isn’t Curt right, but befit was?

I know it sounds stupid, but I have seen this when the owner reinstalled their blades UPSIDE down .

Charlie8d said:

I know it sounds stupid, but I have seen this when the owner reinstalled their blades UPSIDE down .

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No that makes sense, after it was serviced, it worked great, no changes have been made since then, accept for normal use, hardly used it at all last summer as we had a heatwave. Under the decks are free of Debris and even the shafts leading to the blades, blades look sharp but I dont really know enough about this to tell. They look ok. They are correct blades, I didnt hit anything that I can recall. The blades are loose and running freely, I can turn them when I turn the pulleys above, and they are running ok I think.

swagstaff said:

No that makes sense, after it was serviced, it worked great, no changes have been made since then, accept for normal use, hardly used it at all last summer as we had a heatwave. Under the decks are free of Debris and even the shafts leading to the blades, blades look sharp but I dont really know enough about this to tell. They look ok. They are correct blades, I didnt hit anything that I can recall. The blades are loose and running freely, I can turn them when I turn the pulleys above, and they are running ok I think.

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Quick update, I think under some circumstances the blades actually stop turning, maybe when the grass is slightly higher, I tried bring up the cutting deck(Higher Stting), and they spin again, when its lowered they sometimes stop. Then spin again, its almost like there isnt enough power in them when they rotate, any ideas why this might be?

Belts worn out & slipping ?

Charlie8d said:

Belts worn out & slipping ?

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Thanks for that, The Belt is new about a year old. It may be slipping. How do I adjust so it isnt?

Here is a diagram with parts. I am not familiar with your mower, but it looks like most others. The belt tension is provided by an idler pully with a spring that pulls it tight, so no adjustment. A new FACTORY belt should last longer than a year, unless other parts such as Idlers, pulleys , etc. with bad bearings , broken/weak spring are defective or worn out. Cutting grass when it is wet & too high wears out belts, too. Remove tension spring & belt. Make sure all pullies spin freely & are not very scratchy/noisy sounding.
I strongly suspect that the belt you have on there is an aftermarket one, which usually wears out much quicker. This is often the case since Husq " treasures " their parts & charges a small fortune for them. Look up belt part #68. Look around & you should be able to find this part at a better price. Get exact part number belt, reinstall belt as per diagram, connect spring.
Someone else on here may speak up & suggest a decent quality aftermarket belt.

Thanks for all that, very helpful. I think that the drive belt is too loose. And this is why I'm having the issues.

I found this video , if you go to 2:18 on that video I note when I use a bar I notice that the pulley doesn't move hardly at all, nor does the 'Arm' underneath it I tried everything. I think this may be why the Belt isn't tensioning correctly - Any suggestions gratefully received

Quick update, I managed to move the 'Tensioning Arm' if thats what is called, but its still not free, however works perfectly now the grass looks great. Think I managed to tighten the belt just enough, would love to free it up completely though?

AHA. If the spring is unhooked & the belt is off, that arm should swing freely back & forth. Those are the only things keeping the belt tight. You may be able to leave everything as it is now, & squirt some penetrating oil on the area where the arm pivots, & keep cutting the grass with it. It will probably loosen up. Do not get any oil on the belts or pullies. Also, use good penetrating oil, not something like W/D 40.

Charlie8d said:

AHA. If the spring is unhooked & the belt is off, that arm should swing freely back & forth. Those are the only things keeping the belt tight. You may be able to leave everything as it is now, & squirt some penetrating oil on the area where the arm pivots, & keep cutting the grass with it. It will probably loosen up. Do not get any oil on the belts or pullies. Also, use good penetrating oil, not something like W/D 40.

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Thanks, so much appreciate this!