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Old 08-14-2010, 03:42 PM   post #1 of 15
CorsairNC
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Help Allis-Chalmers 816GT Mower Belt Installation

Hello, I am back once again trying to get one of my mowers working this season.
Still having problems.
I have bought a brand new belt for my mower $55 plus tax and want to make sure I am not going to burn it up as I turn on my mower.
I think I have installed the belt correctly but it still seem to be too much slack in the belt.
I have tried installing it via the diagrams in the manual, but I am still a little loss.
Does the belt go on the outside of the front of the PTO area or on the inside?
I am including pictures with this, so if anyone can tell me where I am going wrong I would appreciate it.
Also can anyone tell me where exactly the PTO rod, the chain, and the mower rod are supposed to be hooked up it would help very much.
I think I have all of them hooked up right, but I am not sure.
Also at the back of the deck it looks like something could be broken off, not sure.
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Old 08-14-2010, 09:58 PM   post #2 of 15
MisterJim
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

I'm not quite sure which belt you are replacing. Are you talking about the belt that drives the mowing deck or the tractor drive? My guess is you are replacing the mowing deck belt and the diagram in the manual is the correct way to install it. Although now that I look at my manual for my 816GT I noticed that they labeled the figures incorrectly!! The manual shows a diagram labeled "mower belt pattern" but it's actually the diagram for the "tractor drive belt pattern" and vice versa.

Your pictures are a little dark for me to see exactly how you are hooking up the lift chain for the deck but I recall that on mine there are 2 different mounting holes (one for 42" deck and one for a 48" deck) so make sure you are using the correct hole. I believe it is stamped into the bracket itself. Tomorrow I will try to take some photos of my 816GT deck which will show how the lift chain is positioned between the tractor and deck and post them for you. That is if I can figure out how to post photos on this forum.

I hope you like your tractor....mine has performed great since I bought it new in 1979. I did repower it with a B/S 19.5 hp motor and have replaced one arbor so far and that's about it!! I do need to rebuild the transaxle this fall since it slips out of 3rd gear (probably due to wear). I don't see many people with this particular model so you and I are almost "alone" with this model!!
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Old 08-14-2010, 10:20 PM   post #3 of 15
CorsairNC
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Whew Re: Allis-Chalmers 816GT Mower Belt Installation

Thank you so much for offering to help!

Yes, I am trying to install the mower deck belt and I am not having fun doing so.

I am very confused as to how I thread the belt through the pulleys (but your advise on the wrong diagram might help) so pics are going to help.

I can send you more if you need them and the way to put them on here is the paper clip symbol above.

The max limit per message is 4, so if you need more I can send them here or by e-mail.

If you want to send me pics via e-mail or vice-versa let me know.

I believe this is going to be a great tractor too, but I need to get either this one or a 716H mowing,and soon, because my grass is getting out of control and neither one are working.
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Old 08-14-2010, 10:27 PM   post #4 of 15
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

I will get some photos to you tomorrow as soon as I can that will show the belt routing and also how the lift chain hooks up. Glad I can possibly help...that's what is great about this forum!
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Old 08-15-2010, 01:09 PM   post #5 of 15
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

Here are some pictures I took today showing how the deck lift chain is attached on mine. FYI...Allis-Chalmers had a recall many years ago and sent me a new type of chain connector which is basically a threaded rod with a bend at the top (I never had a problem with the old type so if you have that; I would continue to use it). I think from looking at your pictures that you have it connected correctly.

The mower belt routing is shown in the other pictures and it is according to the diagram in the manual. It will be slack until you engage the PTO lever on the left running board to tighten the tension on it.

Let me know if you need anything more and I will do my best to help you!
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Old 08-15-2010, 02:37 PM   post #6 of 15
CorsairNC
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

Okay, went out and played with the tractor.

Got the belts on right, I think. along with the chain.

Can you please tell me how to tighten belts better since they fall off and the mower blades spin without the PTO engaged (which is dangerous for me since I do not have the arbors for my tractor)

I tested the belts for tightness before I took off and they seemed to be tight, but after re-engaging the PTO the belt fell off and no mowing occurred, but the belt definitely got hot.

Going to wait until after 6 pm here in the South to try to tighten them again.

I think it might have something to do with PTO rod that has the dog collar tightener on it, I know where it goes up front, but I am unsure of where it needs to be attached in the back of the tractor, and I am also not sure how much of the rod needs to be sticking outside the dog collar.

Thanks again.
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Old 08-15-2010, 03:02 PM   post #7 of 15
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

The PTO rod fastens to bottom of the PTO handle on the left side (facing forward) under the running board. There should be 2 holes on the bottom of this lever and the forward-most hole is where you connect to. It should be stamped "mow" on it.

Do you have a copy of the manual yet? If not, I can scan the section in the manual that describes how to adjust the belt tension. Basically, you adjust the "dog collar" so that there is 1/2 to 5/8 " distance from the rod guide (the most forward piece on the rod) and the set collar (just rearward of it). Before you try to adjust this; place the mower in high cut position using the height control lever and place the PTO lever in the engaged position.

Also, you said you don't have "arbors" on your deck. Did you mean the shields that go over the pulleys on the deck? The arbors are the shafts/bearings that connect the pulley to the actual blades.

Let me know if you want me to scan the page from the manual for you.
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Old 08-15-2010, 04:03 PM   post #8 of 15
CorsairNC
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

Yes, I did mean the arbor shields. Sorry.
Okay, I am still confused on the rods.
Look at your middle picture you sent me there are two rods coming off of this metal piece to the left.
The top one I think is the PTO rod which is connected to the back part that says Mow.
The bottom rod apparently goes under the pulleys to hook into a hole in the back that adjusts the pulleys (separates them when engaged and moves them together when unengaged).
Or is this where I am going wrong on the whole project?
Yes, I do have a copy of the manual, but it is not real clear, if you think it will help me please include a copy of the page you are talking about.
Thanks again.
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Old 08-15-2010, 06:18 PM   post #9 of 15
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

Here is some more info for you. You are correct in your thoughts about the rods and hopefully this picture will make it clear. I also took a photo of the page from the manual that show the back end of the rod and how it attaches to apply the tension to the mower drive belt. Notice that the rod is inserted from the bottom at the back end. I hope you can read the text I inserted..it came out smaller than I expected!!
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Old 08-15-2010, 06:30 PM   post #10 of 15
CorsairNC
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

I See!!!
Said the Blind Man.
Yes this is one of the problems then I have been inserting it with the rod facing down and not up.
This is how I received it from the man I got it from, so no wonder he was having problems too!
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Old 08-15-2010, 08:48 PM   post #11 of 15
CorsairNC
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

Alright belt on correctly? Check

Rods in place? Check

Next problem mower deck is out of place and the PTO pulley is hitting metal when I start it up. Sparks Fly!!!

If you go back to the middle picture again and look at the solid metal piece in behind the lever that moves back and forth with the PTO rod it is this piece that is hitting the PTO pulley.This piece of metal is what the movable piece is bolted to.

Any suggestions of how to make sure mower deck is in the right position?

Gave up for tonight since I ran out of sunlight, but would love to get this going in the morning.

Thanks again.
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Old 08-16-2010, 08:46 AM   post #12 of 15
MisterJim
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

All I can tell you without being there and seeing it is to double-check all the steps in fastening the deck to the tractor. Make sure you have it in the proper holes, etc. Is your deck a 48" like mine? Check to see if you have attached the mower hitch to the REAR holes in the front axle mounting points using the 2 pins and safety clips. I guess we are assuming you have the correct deck for your tractor and not one for a different model!! I have to leave for several hours but I will check back later to see how you are doing. Good luck!
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Old 08-16-2010, 01:14 PM   post #13 of 15
CorsairNC
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

Well, I didn't get to it this AM hopefully tomorrow.
A guy called me about a self-propelled 21" Cub Cadet mower that I needed and I had to go pick it up.

However I did find out that there was a cotter pin missing from one of the bolts on the front of the mower deck, so I went and bought some new ones, maybe this will fix the problem of the deck drifting over too far

Thanks again for all of your help and I will keep you posted on its progress.
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Old 09-12-2010, 08:26 PM   post #14 of 15
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Whew Re: Allis-Chalmers 816GT Mower Belt Installation

Hey Jim,
Sorry it has taken so long to get back to you.
Work has kept me busy, but I finally got the mower working.
This is what my grass looked like before I got the mower fixed.
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Old 09-12-2010, 08:30 PM   post #15 of 15
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Default Re: Allis-Chalmers 816GT Mower Belt Installation

This is what my grass looked like after I got the mower fixed.
Except for a semi-dead battery she mows like a dream.
I am going to buy a new battery this weekend and finish the rest of the yard.
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