My 4210 4x4 with hydrostatic drive quit driving runs well but will not travel forward or reverse

Check transmission drive belt and linkage from right foot pedal to transmission.

Things to check out. 1. That there is oil in the drive unit. Is there a reservoir on top and can you find a dipstick? A reservoir should be half full at least. 2. Is the disengage lever or rod pushed in? Look to the rear of the machine frame and low down. This disengages a valve to enable the machine to be moved without the motor running. If in the open position the drive will not work. 3. Check that the belt is driving the pulley on the top of the transmission. This normally has a tensioner which automatically takes up the slack. A worn belt can slip or jump off the pulleys. Look at the motor drive pulley to ensure that the belt is still on it. This is NOT the bottom one which drives the deck and has an electric clutch.

Assume it's a hydrostatic transmission - most probably the drive belt has come off or broken. Be sure to replace it with a Kevlar belt as changing the belt isn't easy and you don't want to have to repeat the process too soon.

check the linkage as the same pump and hydro motor drives both directions

Hi, remove the battery and battery support tray and clean all debris from around the hydrostatic drive, fan and cooling fins. Your problem is caused by the hydrostatic drive overheating. Hope this helps, regards Phil

First check both rear tyre pressures, if ok you need to adjust the rod that runs between the left lever and the hydrostatic drive on the left rear wheel so that the short lever on the hydrostatic drive travels further when push the drive lever forward. Regards Phil

If this is a hydrostatic drive. Check oil level in transmission. If you have been running it low on oil, it may be too late for the hydrostatic drive unit. If it has a drain plug, drain it and change the oil.

Does it have gears or a hydrostatic (automatic) transmission?

If it's a gear model, sounds like a loose drive belt.

If it's hydrostatic, it could be a belt problem or a problem inside the transmission. If it's a tranmission problem, this is not good. Many of the transmissions on riding lawn mowers are not serviceable - they are just replaced.

Recheck your belts, does your engine have a pto

you didnt say what model this is, but i assume its hydrostatic because it has a drive shaft. is the hydrostatic unit filled with oil¿ if its ok, check the linkage from the pedal to the rearend (hydrostatic drive) make sure its not broken or loose.. if that l@@ks ok, check both ends of the drive shaft making sure the couplers are not broke and the drive shaft is ok. hope this helps.