60" deck "sings" when PTO engaged

[WNYPCRepair 1,875]

520H/60" deck. When I engage the PTO the deck makes a high pitched whine. "Singing" or ringing is the best way to describe it. If I loosen the bely way up it stops, but the belt is so loose it is flopping up and down, I'm afraid it is going to come off. I can't tell if the noise is from the deck or the PTO. 

 

Anyone seen this, or have any ideas?

[oldredrider 2,547]

Check the bearings in the mule drive pulleys. They get "harmonic" when dry or worn out.

[WNYPCRepair 1,875]

Thanks. I'll check them tomorrow

[bmsgaffer 2,043]

Also the pto clutch getting worn down with often start to slip and sing.

Check that your PTO has plenty of clutch lining left.

[gwest_ca-(File Mod) 10,478]

Whenever I see pto and 60" deck come up I think of this service bulletin. The early 520-HC models in 1988 required the pto clutch plate be replaced with what must be one with a larger friction area to drive the 60" deck.
http://www.wheelhorseforum.com/files/file/1760-wh61-90-418-520-hc-pto-clutch-plate-when-using-60in-sd-deckpdf/

The available parts list for the 1988 520's is a later 1989 version so the original clutch plate does not show up.
The 114881 plate has been replaced by 94-6650 which is the same one used on all later models with a manual pto.
So the current 94-6650 replaced 103140 facing only, 103477, 103817, 111238 and 114881 clutch plates.
The 1988 300-Series used 111238 clutch plate.
The 1987 418's used 111238 clutch plate.
The 1986 420-LSE used the 103817 clutch plate.

Garry

[WNYPCRepair 1,875]

Whenever I see pto and 60" deck come up I think of this service bulletin. The early 520-HC models in 1988 required the pto clutch plate be replaced with what must be one with a larger friction area to drive the 60" deck.
http://www.wheelhorseforum.com/files/file/1760-wh61-90-418-520-hc-pto-clutch-plate-when-using-60in-sd-deckpdf/

The available parts list for the 1988 520's is a later 1989 version so the original clutch plate does not show up.
The 114881 plate has been replaced by 94-6650 which is the same one used on all later models with a manual pto.
So the current 94-6650 replaced 103140 facing only, 103477, 103817, 111238 and 114881 clutch plates.
The 1988 300-Series used 111238 clutch plate.
The 1987 418's used 111238 clutch plate.
The 1986 420-LSE used the 103817 clutch plate.

Garry

Also the pto clutch getting worn down with often start to slip and sing.

Check that your PTO has plenty of clutch lining left.

So if my 520 is a 1995, it should already have the 94-6650, or am I reading that wrong?

[bmsgaffer 2,043]

That is correct, as long as someone didn't replace it with the small one.

[WNYPCRepair 1,875]

Check the bearings in the mule drive pulleys. They get "harmonic" when dry or worn out.

So I finally found some time to look at this. There is a grease fitting on the shaft, but nothing near the pulleys/bearings. Does the one on the shaft force grease into the bearings, or do I need to disassemble it and grease the bearings by hand?

[cleat 4,936]

Grease fitting on the shaft is just for the spring tension on the mule drive itself. Bearings on each pulley is sealed.

You may be able to disassemble and grease the bearing with a needle grease gun adapter or just replace the pulley if the bearing is rough or loose.

Cleat

[WNYPCRepair 1,875]

Thanks