check the connection of the shifter rod to transmission. Check the foot pedal to see if it is rusted and not moving. check the brake mechanism on the right front side of the transmission. It might be stuck on!

Another thing--did you have the back wheels off recently? Did you insert the axle keys when re-installing the wheels!?

Rustyj14 thanks for your input. I got under the tractor and followed the rod back to the pulley in the back and it seems to be operating normally. What I did find is that the brake pedal seems not to be coming back to normal position after depressed. In other words, if I pull back on the brake pedal with the heal of my foot and press the accelerator pedal the tractor moves forward and reverse. As soon as I let go of the brake pedal the belt loses just enough tension so that the unit won't go forward. Is there some mechanism that is supposed to be on the brake pedal to keep the tension on the belt. It almost seems like a tension spring fell off or something but I can't tell if there is supposed to be one.

From what you decribe ,sounds like it could be the Drive Belt,or your Transmission could require purging (See Manual Purge the Transmission)
Good Luck

What I did find is that the brake pedal seems not to be coming back to normal position after depressed. In other words, if I pull back on the brake pedal with the heal of my foot and press the accelerator pedal the tractor moves forward and reverse. As soon as I let go of the brake pedal the belt loses just enough tension so that the unit won't go forward.

sounds like you lost a spring.

I followed the brake rod to the back of the tractor. There is a spring there that is on the brake rod itself. The spring seems to be floating freely on the rod. It is surround by washers and nuts. According to the manual all of the parts are there I just don't know if the spring is supposed to float freely or actually be attached to something. If anyone that has a DLT 2000 could look at theirs and tell me how it is attached I would greatly appreciate it.

There is a compression spring on the rod and some a tension spring that hooks on the front caliper bolt if I recall. The 917 # from under the seat would be helpful. Make your life easier and pull the r/h rear tire so you have access. Sometimes a coating of rust on the back of the lever can bind. A light lube can help it along- not on the disc! It may take an adjustment via the castle nut. Tho it sounds like the brake releases with help I'm guessing the caliper is ok. Sometimes the 2 actuating pins seize in the caliper and then the caliper needs to come off and be freed up + the disc on the shaft as well. Once you get the lever moving freely tho, it should be fine.

Turns out it was the clutch tension spring. The spring had shot up into the front housing of the motor and was barely poking out. Actually I am amazed I found it. I ordered a new spring it was around $7 but it cost $8.50 to ship what a load of crap. Anyway when I get the spring I am hoping I can figure out where it was supposed to attach. I think I have a reasonable idea. Thanks for all your help. This forum has assisted me on numerous occasions.

Are you still following this? i have the same issue. the spring is floating at the seeming end od the brake rod.