Toro lawn mower blade disengages or belt slips. belt is quite loose but can't see away to tighten it. Mower model no. is 26622

Check the drive belt underneath is not loose and slipping.when engaged.

If the belt has quite a few hours it may have stretched enough to cause it to slip. May have to replace it. I replaced mine and works fine now. As a short fix you can spray with a belt dressing and will work for a while if the slippage is not too bad. The can will specify for slipping belts.

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on the linkage to tighten the belt one of them is adjustable look for a rod with a lock nut on it

Check the belt on top of the mower deck. Make sure the belt didn't slip off or break.

This 1991-92 model is equipped with a blade brake clutch. When the blade slows down this means the belt is slipping. This slipping can be caused from a few different things.
1 --A loose cable.
Try adjusting the blade cable on the upper handle. this unit has an adjustable section. make sure the cable is not so tight that you snap it.
2 --A sticky pivot point under the belt cover
The belt cover in the back builds up with dirt and debris. Make sude it is clean under the cover and all of the pivots move freely. ( do this with the engine off)
3 --A sticky belt tensioner under the deck cover
The underside of this machine has a metal cover to protect the belts. Remove it and check that the blade belt idler arm is not frozen in place. this will cause the belt not to enguage all the way.
4 --A worn belt or belt pulley
The large flywheel and pulley can wear. Check this if the belt looks good.
This is all there is to the machine BBC system.
I hope this helps.

Get parts and more diagrams at a Master Toro Dealer like www.arcolawn.com

Ya most likely the lever that you normally squeeze to make it "go" has a cable. Cables stretch just like belts. If you replaced the belt already then that automatically removes any stretching that the first belt would have suffered from no doubt. Look at the drive lever's cable up at the lever end. There is usually a cable adjuster there. It will be a threaded shaft portion with a nut or knurled ring to spin. tighten up that "go lever" cable a bit. Even better, if you have visual access to the belt as you squeeze the drive lever, then you can see if squeezing that lever moves one of the belt's pulleys enough to cause it to tighten it up enough to transfer spin motion thru the belt to the other pulley. You see that whole system is really a "slip belt clutch" when belt is loose, no forward motion, as you squeeze the "go/drive" lever the pulley moves away tightening up the belt more and more. The tighter the belt, the less the slippage, the faster you go! But the slippage is necessary! ( That's the clutch component) If you simply had the belt tight all the time, the mower would always go full speed! It would be in full time "run away mode" LOL! so watch out. Once you see it in action...you'll get the idea no problem!

For removing/replacing the deck belt, the general method is:

1. turn off engine, remove key and set parking brake
2. disengage blade by putting blade engage lever into off (disengaged) position
3. lower the cutting deck to the lowest position (closest to the ground)
4. relieve the belt tension (depending on the model, use a 3/8 inch ratchet set to tighten in the square hole of the idler bracket)
5. remove and replace the belt

NOTE: it's not necessary to completely remove the cutting deck.

Useful diagrams for removing the cutting deck, http://216.213.143.2/ProAuthor/ManProc.cfm?ManualID=425&ProcID=14794

For deck belt diagrams, http://216.213.143.2/ProAuthor/ManProc.cfm?ManualID=425&ProcID=14796

If the transmission drive belt needs to be replaced, several components must be removed and special tools (i.e. air/impact wrench) used in order to change the tractor's transmission drive belt. See an Authorized Toro Service Dealer to have your drive belt replaced.

1. block off the blade and driver assembly with a 2x4 to keep it from moving
2. remove the flywheel nut (regular hand force should be sufficient)
3. tap the 3 holes on the flywheel (if they aren't already threaded) using 1/4inch 20national tap set
4. remove the flywheel using a flywheel puller -- a harmonic balancer puller which matches the tecumseh bolt pattern on the flywheel also works using 3 1/4inch thread (20national, 2inch long) bolts with washers
5. NOTE: (if the blade was removed/reinstalled, tighten the blade to manufacturer's spec of 60lbs) before installing the new flywheel key
6. remove the sheared flywheel key
7. clean up the flywheel (wipe off all the dirt and grease)
8. install the new flywheel key (part 611004 for toro 20016)
9. install the flywheel (pull the bail brake handle to get the ball-brake inside the flywheel)
10. tighten the flywheel nut to manufacturer's spec of 37.5lbs
11. prime the gas bulb, give it a pull and mow away

Check the belt under the mower. It runs from the shaft that the blade is on, to a little gear box. Sounds like it may be worn out.