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Tom tractor

My 9020, 60 inch deck looses all power in high grass.  It only starts to work after I turn the PTO off and then back on again.  I believe the belt is slipping because the motor doesn’t loose power.  I have the mule drive as tight as it gets.  Do you believe the PTO needs adjusting or the belt is the wrong size?  

Thoughts?

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SimpleOrange

We need to know the numbers from your belt to determine if it's the right one, should be a "B"

Could have a spindle bearing siezing up, belt could be glazed, air gap on your clutch may need adjusting. lastly maybe the blades need sharpening.

By high grass are we talking lawn or orchard grass, my mower struggles with clusters of rouge alfalfa.

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jlasater

Last I heard (I asked in another thread) the mower deck on the 9020 uses an HA "A" profile belt, not "B". I put a B on mine and it is VERY hard to get it past the battery and front PTO pulley. The length is 93". Gates Power-Rated belts are the closest aftermarket equivalent to the Simplicity belt as far as durability.

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Richard Wright

The 60 inch deck on my Sunstar uses an AA belt, meaning that it's double sided. Some of the spindles drive from what would be the back side of the belt. When I got the mower it had a regular A belt of the correct length but wouldn't run and cut right because the back side of an A belt is flat where the AA belt is a sort of diamond cross section. Could the 9020 use a similar belt? Putting the correct belt on the Sunstar made a big difference, particularly in high grass.

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jlasater

There are no idlers riding on the back side of the PTO belt on the 9020 for the mower deck, so a regular profile belt is what is needed. The spindle drive belt on the deck itself does have an idler, but it is a regular flat idler, not a V-belt idler that has a V profile.

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SimpleOrange

The mower itself uses an "A" belt to spin the blades while the belt coming from the front clutch is the wider "B" such as that I'm using on my snow thrower.

The Gates Hi-Power II  A90 is the correct belt to drive the three blades, not sure what number the "B" belt from the electric clutch is. I do not have that belt.

I'm using a Kevlar belt for the snow thrower, side by side you can see that the belt used on the clutch side is much wider than the "A" belt.

 

 

 

20180609_210958.jpg

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Edited by SimpleOrange

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jlasater

Color me confused. I too think a B belt looks like it fits best but everything I am reading says an A belt is the correct one. P/N 1657044 and 172420 both show up as A, 1/2", 4L dimension belts. Like I mentioned, it was a major chore to get a B belt past the battery hold-down. I had to roll the belt which I'm sure isn't very good for it.

Further info, when I took the mule drive idler pulleys off to replace them (one of them lost all the bearings), it was obvious the B belt I have been using was only riding on the outer 1/8" or so of the pulley sheaves on one side, but about 1/4" on the other side. I assume that was from differences in tension on the belt sides as it bent 90deg and another 90deg.

Edited by jlasater

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SimpleOrange

Below, the complete electric pto has the wide groove is from a Deutz Allis that uses the B belt, large pulley by itself of from another front PTO from a 9020 that I have as a spare. I've fitted both the A and B belts into each.

I now think the mower deck and my snow thrower if one were to go by the part numbers uses an "A" belt, I've used the B on my snow thrower for the past two years without any problems.

Like jlasater says the B is a bit tight to get past the battery hold down.

First image is the belt that runs the hydraulic pump on the Fel and it looks to be an "A" belt.

 

 

 

1.jpg

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Tom tractor

I believe the problem with the loss of power is coming from the PTO needing to be adjustmented.  The manual is a bit confusing.  It says to stick a .010 feeler gage 1/16 into the PTO.  MY QUESTION IS..  within the measuring hole ... is that between the actual clutch plates (which I can’t see) or between the outside guard and clutch housing (where the arrow is pointing - which is now about 1/8 of an inch wide.)

512E960A-37C4-4BBD-B1DF-5115D745B203.jpeg

Edited by Tom tractor

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PhanDad
6 hours ago, Tom tractor said:

 is that between the actual clutch plates (which I can’t see) or between the outside guard and clutch housing

On the adjustable electric clutch I have, you measure between the clutch "plates":

 IMG_9727.thumb.JPG.abe3705339f05fc7e610f877a3b30e77.JPG

IMG_9728.thumb.JPG.72ccd6103261bbbd50142f9f128d3fda.JPG

 

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PhanDad
On 6/9/2018 at 11:49 PM, jlasater said:

Color me confused. I too think a B belt looks like it fits best but everything I am reading says an A belt is the correct one. P/N 1657044 and 172420 both show up as A, 1/2", 4L dimension belts.

And to add a bit more confusion, according to the Simplicity Belts cross section table:

Belt_Xsection.thumb.JPG.ca59d53a9d85cd9d4402caeed60c08b4.JPG

A "HA" belt is 1/16" deeper than a standard "A" belt (4L cross section) and a "HB" belt is 1/32" wider and 1/16" deeper than a standard "B" belt.  So a "Simplicity" HB belt would ride even higher in the 9020 pulley shown above.

 

 

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ACT816

It doesn't look like you are adjusting the actual clutch but the brake plate.  Some had this and some didn't btw.  I discarded it on mine before I did the repower and the new clutch doesn't have this either.  The spacing between the field and the rotor is not adjustable:  Field is 49 and rotor is 50. 

image.png.24915ad3d82b506b50a4376738bf580a.png

 

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babablacksheep

Before you tear into the clutch and replace all the belts, check your blades. Bogging down the mower is usually due to not being able to discharge the clippings fast enough.  A AC720 is capable of mowing grass and weeds almost half way up the grill.  Your blades must be sharp, the lift wings on the ends must be in good shape, and the engine should bee at full throttle. If it still bogs, make two passes. Do the first with the deck all the way up, and the second at the finish height you want. Good luck.

 

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