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Tractor Talk Discussion Forum

Sears Suburban Reverse?!

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James Rigby

03-20-2005 12:33:09




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i have a 1963 sears suburban 725
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this might not be the exact model but its the closest picture ive found. can anybody tell me how the reverse mechanism works. belts run from the engine to the rear of the tractor, then there is a double pully, one pull runs freely, another is attached to the drive, between them seems to be some kind of friction plate/clutch. in front of the steering colum is a lever with a steel cable attached to it, this cable runs to an odd mechanism at the back of the tractor, a metal wheel that rubs against the belt, and then a pully that lines up with the outer of the two pullys with the clutch plate inbetween, does anyone know how this works/any advice at all i can not figure it out

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chad (ohio)

04-24-2005 19:02:38




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 Re: Sears Suburban Reverse?! in reply to James Rigby, 03-20-2005 12:33:09  
james, i own the same model and year,63suburban725,the 3 pullies off the right side of motor are 2 speeds and 1 will run a snowblower etc.when u engage the lever to them pullies it then tightens the long belt going to the clutch pully,now how the reverse works.while your driving forward the 2 pullies are compressed together,when u move the lever back for reverse they are supposed to seperate allowing the big 1 to go forward and the little 1 to go backwards,the cable coming up from the bottom draws down on the little 15inch belt so the rearend will go in reverse,now there are 4 bolts in the 2 drive clutches,to adjust u want to remove the outer 2 push the lever forward with the engine off, put a 1/2 inch ratchet in the center and turn it forward until good and snug but not all the way tight u still want it to be able to open up for reverse,beleive me you will play with this for awhile till both work right.I have not still been able to find new clutches yet,I restored mine complete last year its pretty awesome,but I still have problems with the clutch every now n then,goodluck email me back we can swap information and some pics. these tractors are getting real hard to find,there for awhile i wasnt for sure if there was anymore out there other than mine,hope I could help.....chad

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James Rigby

03-20-2005 12:35:07




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 Re: Sears Suburban Reverse?! in reply to James Rigby, 03-20-2005 12:33:09  
when i say one runs freely and one is attached to the drive, one turns when the wheel turns and the other is turned by the belt from the motor, the innter one is attached to the motor, and this is the one that the metal wheel behind it rubs on, then the steel cable adjusts a smaller pully that seems to be some sort of tentioning device, that would i suppose adjust the tention on a belt that goes to drive the wheels, but the system doesnt make sense, how does it grip in both directions?

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Chris(WA)

03-20-2005 21:25:46




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 Re: Sears Suburban Reverse?! in reply to James Rigby, 03-20-2005 12:35:07  
Lets see if I can explain this clear enough to understand. The lever engages the clutch when it is pushed forward.There is a linkage and fork mechanism to do that part.There is an over center posistion it will lock into when it is pushed far enough. Kind of like using the hand clutch on a John Deere. When you pull back on the lever to the middle posistion the clutch disengages. Neutral. When you put pressure backwards on the lever it pulls on the cable. That puts tension on the idler wheel which presses against the reversing belt, tensioning it so that the clutch is driven backwards and the tractor backs up. Hope this helps. It works much easier than it is to explain!!(This would be much easier if we were standing next to my Suburban 725 so I could show you instead of explaining!!)

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