Cub Cadet CS760 blade timing belt

[Matthew Arnold]

I noticed today that the tensioner pulley on the cutting deck for the blade timing belt is bent upwards. On Monday a colleague was using it and hit a large (8 inch) wooden stub and caused the belt to jump off which made the blades connect several times before the machine was switched off. I will get a picture of it tomorrow to show what i mean but is there anyway we can bend/straighten it back to the position it was or will it be easier to buy one?

 

Has anyone got a picture of this model with the timing belt shown?

Edited June 13, 2013 by Matthew Arnold

[Rich2484]

I noticed today that the tensioner pulley on the cutting deck for the blade timing belt is bent upwards. On Monday a colleague was using it and hit a large (8 inch) wooden stub and caused the belt to jump off which made the blades connect several times before the machine was switched off. I will get a picture of it tomorrow to show what i mean but is there anyway we can bend/straighten it back to the position it was or will it be easier to buy one?

 

Depends on a couple of things.

 

One are the blades knackerd. Have they taken huge chunks out of each other.

 

Are the bearings ok?

 

The timing gear may be salvageable but this depends on what part is bent. And in what state the pulley is.

 

Get it apart and give it a good going over.

 

I don't know the price or availability of a new part without looking.

[Matthew Arnold]

Depends on a couple of things.

 

One are the blades knackerd. Have they taken huge chunks out of each other.

 

Are the bearings ok?

 

The timing gear may be salvageable but this depends on what part is bent. And in what state the pulley is.

 

Get it apart and give it a good going over.

 

I don't know the price or availability of a new part without looking.

 

They blades have luckily just skimmed each other on the back edges. The bearings were replaced about 3 months ago and the blades were also given a tickle and rebalance. The timing gears are in good nick as they run off each other with a toothed belt. Strangely its the tensioner in the middle which has been knocked/bent up out of alignment but is still keeping tension but is rubbing into the main blade belt engagement pulley arm and has worn a substantial groove into the metal work. I will get a pic of it and various damage caused by it.

 

We just got it back from the workshop for a new blade drive belt too.

[Rich2484]

Yeah get a pic up. Sounds like its bent downwards? Is that right?

 

May have bent the metal deck rather than the arm on the adjuster, check the stud the tensioner assembly sits on.

[Matthew Arnold]

Yeah get a pic up. Sounds like its bent downwards? Is that right?

 

May have bent the metal deck rather than the arm on the adjuster, check the stud the tensioner assembly sits on.

 

Bent upward somehow to the point where the timing belt is nearly being pulled off the two blade pulleys. Will have a look at the deck for damage at that point but it looks like it has been given a damned good thwack up as the tensioner is mounted on 4mm steel.

 

Here is a manual in pdf form.

http://www.cubcadet.com/wcsstore/CubCadetCatalogAssetStore/Attachment/owners%20manuals/residential/2010_CC760ES.pdf

 

Page 21 Figure 6.6 shows the belt configuration. The thicker line is the blade timing belt and the pulley which is bent upward is the one which is off centre in the picture with the single dot. The clear/thin belt is the blade idler/drive belt.

Edited June 13, 2013 by Matthew Arnold

[GardenKit]

Its strange that that pulley arm should have bent. There is not much load on it, even under shock, and then the spring should take it.

 

Any load should be in the same direction as the arm and not bend it unless for some reason the pivot is too tight so the shock load was unable to move the arm in the designed direction so it had to go somewhere else, in this case, up.

 

Maybe be worth checking that pivot.

 

As to whether the arm can be straightened. I would have thought it possible, but it must be exactly right or it will stress the toothed belt, so maybe best to replace it.

[Matthew Arnold]

Sorry for slightly shaky pics but was taking pics with engine running. You guys ever seen a pulley arm bend like this before?

[Rich2484]

That did get hit hard then. Best to remove it and inspect it for the damaged areas. Should be easy to spot if the arm has bent.

[Matthew Arnold]

That did get hit hard then. Best to remove it and inspect it for the damaged areas. Should be easy to spot if the arm has bent.

 

Oh yes. It was droppd into the workshop first thing this morning. The first thing the bloke said was "what the hell did you hit?". That pulley and its arm shouldnt have bent like that according to him but he said he will get it replaced or repaired for us and joy of joys its still under the 2 year warranty.