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Will run on starting fluid but not on its own. Checked the fuel pump and it seems to work. Pictures show a electrical plug on the bottom of the carb that I'm not sure what it is supposed to do. If that checks out my next idea is to pull the carb for cleaning. Printed a user manual for reference and would like to find a service manual. New tires and battery are worth more than I paid for it. Also, how can I tell when it was made?

The solenoid on the bottom of the carb should hear feel it click when you turn the key on and off. It looks like that model number was made in 2005 only. And the Engine service manual is part number 273521. MTD is not real real good with their mower service manuals and leave a lot to desire if they even have the manual for your mower.

ILENGINE said:

The solenoid on the bottom of the carb should hear feel it click when you turn the key on and off. It looks like that model number was made in 2005 only. And the Engine service manual is part number 273521. MTD is not real real good with their mower service manuals and leave a lot to desire if they even have the manual for your mower.

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If anti afterfire carburetor solenoid is working correctly, then most likely, the carburetor will need to be removed and thoroughly cleaned to have engine to run .

Definitely lacking on the service manual for the 600 series auto drive, just 13 pages.

Good catch on the solenoid working. Could not detect any clicking while turning the key off and on. Checked the plug and it did show 12 volts but it was rather crusty. Sprayed some contact cleaner and worked plug a couple of times and it started clicking. Hit the starter again and after a few cranks she started and stayed running. Ran around my tiny yard and down the alley to mulch some leaves. Day 2 was a win.

Broke the deck belt which was already badly worn. Book calls for 954-0349 but that is way too long at 79". I took some string and wrapped it around the pulleys ant it was closer to 60". This deck has 2 belts to run the blades, Top belt from the motor, around the tensioner pulleys and the left most spindle. The other belt ties all 3 spindles together. Now I don't know what length belt to buy or how to look it up.

the 0349 belt goes around the pulleys, looking at the diagram, it appears 754-04064 goes from the engine pulley to the double pulley on the deck. It measures at 68" though

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Thanks for the reply but 68" still seems to be a bit long. The old belt is closer to 63" and unless it was routed wrong (doubt since the routing is pretty straight forward) the 68" would never engage. There are no visible numbers on the old belt. Makes me wonder if something was swapped out somewhere along its life. Trying to make sure I get the correct belt before purchasing.

so the 0349 deck belt is 1/2" wide, And since the shorter belt that was on it, seemed to work properly, i'd buy a 1/2" x63" belt and see where that gets you
a Stens 266-155 would be a well made, but cheap, alternative.
a heavy duty alternative would be the True Blue

I think the 63" is the way to go and I ordered one. Should be here in a couple of days. Thanks for all your help.

The 63" belt is too short. I can force it onto the pulleys but there is no slack at all to disengage the blades. Still cannot find any data to give me the correct length to buy. Trying to decide on the next length to try, leaning towards a 65" but not sure.

Found it. The belt I'm looking for is the 68.25" by .63". I kept calling it the deck belt but the diagrams list it as the PTO belt. You had it right but I couldn't see it. Thanks

Spent some time over the past couple of days doing some small things. Oil and filter, adjusted the valves, air in the tires, rubbed some plastic restorer on some parts, tried buffing out some of the sun fade and oxidation, a little paint touch up and some general cleaning. Still waiting on the new belt to arrive. One big thing left to do is the seat. The old cover is split in several places and the foam is questionable. Considering a new aftermarket seat but that will have to wait a bit. Not sure if or how the seat comes apart to do some repair work instead of new.

The length spec of lawn tractor v -belts is the OD of the belt.

You can take a piece of string and measure the length of the old broken belt.
I also keep a upholstery cloth tape measure handy (from wal mart sewing section for about $3) and BEFORE installing a new belt I measure the OD with the upholstery tape. I've found lots of new belts that are not the length specified when ordered.
When replacing v belts I measure the OD length of the old belt in use and compare it to the part number length and then measure the new belt length when received. At the price of V-belts it saves $$'s to keep a constant heads up.
While the belt if off is a good time to check the pulley and spindle bearings to make sure they are Ok.
A owners manual surfaced over at sears parts direct at this link.
You might want to investigate such. I seen couple other downloads but I did not view them.
Also you need to keep a heads up about that type drive (variator type)requires that both drive belts be replaced as a set to get proper drive travel. I did not read the manual but this is usually so with that type drive.
Link at sears parts direct.
click on manual and then the 769-01XXXX

New belt is installed and seems to engage the blades properly. Next up is going to be the spindles. The noise level is very high when the blades are turning. I'll take the belts off the pulleys and spin each spindle and pulley till I find the culprit. Maybe just plan on some new bearings while I'm spending time on this one. Anyone know the specs of the spindle bearings?

Should be 6204-2RS bearings if I remember correctly.

Pulled the spindles off today and yes the bearings are growling. The numbers on the old bearings do indeed match as stated above. This should make quite a difference in noise levels when I get it back together.

Got it all back together today and everything seems to fine. The muffler is shot so the motor makes more noise than the deck. Probably won't do anything about that. Blades are chewed up some so I ground some material from the opposite ends to balance them a bit. Next big thing is to work on the seat. Lookin pretty good. I should take some pictures of my work.

Finally got around to taking a few pics.

Is that where an animal has chewed on the shifter and a pedal?

Your seat would last awhile with a cover.

I've used contact cement and indoor outdoor carpet and fixed lawn tractor seats with good results. Weldwood is the best contact cement and the spray one is more user friendly.
i just cover all, including the back. (after removing the bottom bracket.
I've have some that are going on 8 years old and still look good.

Shoo goo is really good for re-glueing if the seat cover is still good but coming loose from the plastic backing. (but not needed if covering all with indoor/outdoor carpet)

After removing the deck you can replace the spindle bearings without removing the spindle housing. Take the top pulley off and drive the spindle shaft out the bottom, then remove the bearings. You tube videos about such. Just leave the blade on the shaft if desired. I usually re-pack new bearings if they have the removeable plastic seals.

Nice old machine, might be a keeper.

Forest#2 said:

Is that where an animal has chewed on the shifter and a pedal?

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Not sure what those marks are from. Came to me that way.

Forest#2 said:

Your seat would last awhile with a cover.

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Plan is to either cover or replace the seat sometime before May. This whole project is for someone else.

Forest#2 said:

I've used contact cement and indoor outdoor carpet and fixed lawn tractor seats with good results. Weldwood is the best contact cement and the spray one is more user friendly.
i just cover all, including the back. (after removing the bottom bracket.
I've have some that are going on 8 years old and still look good.

Shoo goo is really good for re-glueing if the seat cover is still good but coming loose from the plastic backing. (but not needed if covering all with indoor/outdoor carpet)

After removing the deck you can replace the spindle bearings without removing the spindle housing. Take the top pulley off and drive the spindle shaft out the bottom, then remove the bearings. You tube videos about such. Just leave the blade on the shaft if desired. I usually re-pack new bearings if they have the removeable plastic seals.

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I removed the spindles without removing the deck. Easy enough to replace the bearings on the workbench then bolt the spindles back in place. Also much warmer and more light working in the basement.

Forest#2 said:

Nice old machine, might be a keeper.

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Sort of a keeper, it will be staying in the family.

Thanks for the reply.

ritalz said:

Broke the deck belt which was already badly worn. Book calls for 954-0349 but that is way too long at 79". I took some string and wrapped it around the pulleys ant it was closer to 60". This deck has 2 belts to run the blades, Top belt from the motor, around the tensioner pulleys and the left most spindle. The other belt ties all 3 spindles together. Now I don't know what length belt to buy or how to look it up.

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Step 1 - Measure the shaft centers along each part of the correct belt run and add them together - double the total.

Step 2 - Then add up the circumferences of all the pulley's - and divide the number in half.

Step 3 - Add the result of step 1 to the result of step 2 - and that will usually get you pretty close to the required belt length.

100% accurate with two pulley's - the greater the number of pulley's the greater the potential error.

I hope that you checked the oil carefully before you ran it......if that carburetor solenoid was stuck in the down position .......you could have oil and gas mixed........if you have ran it a while chances are that it is ok.........It happened to me, but I was lucky enough that I got so much gas in the crank case that it locked up and wouldn't turn over.......I have a twin 22 horse with fuel pump......

Thanks for the reminder. Actually I did check the oil first. It was a bit dirty but still free of any gas smells. I have since changed and installed a new filter and will probably change it again before turning it over to its new owner. Kind of used to checking things as I frequently work on older motors.

Was reading somewhere that steel wool can be loosely packed in the muffler to deaden the noise a bit. Some #3 steel wool for a couple dollars did a pretty good job. Quiet enough that now I can hear more deck noise. I'm gonna pull the belts off again and check all the pulleys one by one till I find the culprit. I have attached a pulley to my electric drill and will use a belt to spin each pulley while listening for the noisy one. I think there are 7 pulleys on the deck and I've already replaced the bearings on the 3 spindles. It could still be one of the spindles if I messed up on reassembly.

Idler pulley was the culprit. Bad news is the prices for this pulley are outrageous and out of stock in most places. Found one online for a favorable price and placed the order. Now I have to wait several days before I can start working again. In the meantime I will work on the seat. Covered it with some vinyl from the fabric store and pulled most of the wrinkles smooth by hand. Glued the newly covered foam to the pan and it looks ok at best. Also working on some nice emblems to attach to the hood (see pic). This is the first draft and was made on a 3D printer.

Not much to add since the last update. Found a brand new set of blades on marketplace for $10, deal. Got the new idler pulley mounted and the deck is still has more noise than I like. Still working on the emblems and doing some touch ups on the paint. Had to stop to take care of some other projects.