Mower deck 2003 Cub Cadet tank M60 KW keeps throwing the pto belt...

KobraKommander · Jul 21, 2015

No idea whats going on with this thing and its driving me up the wall LOL. I have bought a new belt, tightened the idler arm tension spring, and this belt keeps jumping off as soon as I engage the blades. I just got it back a couple of weeks ago from the shop and it cut perfectly for me all day. The next day it started this whole belt jumping mess and I haven't been able to figure it out. Spindles look fine with no dents in them. They don't look out of alignment either. As soon as I hit the switch the deck shudders slightly and the belt jumps right off. Anyone have this problem? Could a bent deck cause this? Thanks in advance.

bertsmobile1 · Jul 21, 2015

Have a long think about it from the belt's point of view.
When the clutch fires the engine suddenly jerks the belt which "pulls" the belt back towards the engine causing the deck pulleys to rotate.
If anything prevents this FREE rotation, then the belt will pull the deck backwards towards the engine pulley causing the deck to shudder
This creates a lot of slack in the already slack side of the belt which will then fall off one of the pulleys.

Most common culprits
Build up under the deck
build up around the pulley
Faulty spindle brake ( don't think you have one )
overtight spindle bearings ( tappered roller types only )
Tight spindle bearing
Over tight tensioning pulley

I have yet to lay a spannar on a tank so can not give specific information.

KrashnKraka · Jul 22, 2015

bertsmobile1 said:
Have a long think about it from the belt's point of view.

[excellent tutorial deleted]

I have yet to lay a spannar on a tank so can not give specific information.

I am able to inform you their close cousin, the APC, whilst very unfriendly noisy cans...
does **not** throw belts

KobraKommander · Jul 22, 2015

So basically go clean the deck off and try it again?

KrashnKraka · Jul 22, 2015

KobraKommander said:
So basically go clean the deck off and try it again?

Wellll.. given the history you post I would be looking at belt tension.
However any debri no matter how insignificant could also be a likely
factor. So yeah, housekeeping first

jgore67 · Apr 14, 2019

Having same problem, we have cleaned deck replaced belts, etc. any other suggestions? Considered replacing spindle assembly but they are showing to run $150-200 each just for spindle.

quedogf94 · Aug 8, 2019

I'm having the same issues my PTO idler arm isn't tight and my belt keeps jumping off. I don't think it's the spring, but could be. The pulley is to close to the belt, once I engage the pto, the belt rubs against itself.

bertsmobile1 · Aug 9, 2019

That belt routing looks to be wrong
Do you have the 2 belt deck or the one belt deck ?

quedogf94 · Aug 9, 2019

I have 1 belt for the blades and 1 belt for the pto. Also it's the m48.

mechanic mark · Aug 9, 2019

https://www.cubcadetpartsnmore.com/cub-cadet-service-manuals

click on z wing service manual see page 3 regarding PTO tension pulley, inspect this pulley for wear & bearing wear.

Mower deck 2003 Cub Cadet tank M60 KW keeps throwing the pto belt...

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