John Deere L120 transmission high pitch noise and no forward move

No transmission speed or low transmission speed.

Likely a bad transmission speed sensor but can be other. Check for loose cable connections, and harness for damage.

You have a fluid overheat condition here, so something is wrong inside the transmission that is causing this.

John Deere mowers, for the most part, use hydrostatic transmissions. These use an oil of some type (they vary by model) in the transaxle to provide hydraulic pressure to move the tractor. Older tractors will eventually experience some oil leakage over time due to seal wear. If the level gets too low, then you fail to move. Check the oil level in the transaxle. The location of the reservoir varies from model to model. If it is low, after determining the correct oil to use, fill to proper level. Then, start the tractor and work the hydrostatic drive lever forward and backward slowly and continuously until you get full speed operations in both forward and reverse. This can take a few minutes until all the air has been purged from the system.

check the oil level

this hydrostat drive tractor is designed to max at 5.5 mph forward, 2.5 in reverse, check linkage at pedal if you dont think your achieving those speeds

your rear end is going bad and they are realy exspensive, buy a new mower.

Go to youtube . Type in your make and model/ forward and reverse will not engage. Should be helpful.

Hi, your problem is caused by the transmission over heating. Remove the battery and battery carrier and clean all grass and debris from the hydro cooling fins and fan. Hope this is helpful, regards Phil.

see these 2 forums
http://www.tractorbynet.com/forums/john-deere

http://www.mytractorforum.com/12-john-deere-forum

I have lost the key to my John Deere Model L118 lawn mower. Where can I buy a replacement?