Craftsman tractor won't roll

Good afternoon,

I have been gifted a Craftsman lawn tractor from my in-laws and need to get it home to service, etc. Looks like a 2014 year model that hasn't ran in 4-5 years. This model has the hydrostatic transmission.

Craftsman T3000 / Model 917.203900 / Serial # 021714A00317. The tractor will not manually roll. I have pulled the release pin in the back out and locked into position and made sure the parking brake was released. Tires are low; not completely flat. I need this tractor to roll to get it out of their shed and onto my trailer.

Any suggestions on what to check?

Thanks

The parts diagram:
 
https://www.partselect.com/Models/917203900/Manufacturer/200/
 
To get you home so you can dig deeper, pull the rear wheels off. 
Then remove the KEYWAY on each rear wheel and re-install wheel, (perhaps with some grease)
as the rear wheels will now turn W/o being "connected" to the transmission..
 
Once home, check the parking brake pad, they tend to bind when sitting for a long time and just
in general everything referencing the parts diagram...

Part #8 is a "brake kit":
https://www.partselect.com/Models/917203900/Manufacturer/200/Sections/Transaxle/?ModelID=7657666&ModelNum=917203900&mfgModelNum=&ManufactureID=200&Selected=7FDA4CBF7FD305ED97BA303D3F9EC054768B3BE2&Position=11&mfg=Craftsman&Type=Lawn%20Tractor&Mark=11 

So I went and got the lawn tractor today. Was able to get in in freewheel and rolled onto my trailer.
I checked plugs, oil level, etc, I took off the shroud and blew out about ten pounds of mice nest and dirt.
 
I hooked a jump pack to it and it started up after a few seconds. I drove it around the yard some and it stalled and sputtered some after jumping it back off. I have the batter on charge now.
 
The deck belt is a tangled mess. I will take the deck off tomorrow and  be sure the belt is routed correctly.
 
It does have the CVT transmission. I have blow it off as much as i can get to as the fuel tank is directly under the seat. Is there a way to really get to the transmission without dropping it out of the tractor?
 
Thanks

This weekend, I drained the old gas and put in fresh. Changed fuel filter, air filter and plugs. I took the carb off and cleaned it. I blew pounds of mouse nest, dirt, etc off of the engine, behind the carb, etc. The engine is running like a top now! I put the deck belt back on correctly and the blades engaged nicely. The deck hanger was missing a clip which caused the deck to swing back and forth, but fixed that. I cut suprisingly well. It does have a screeching / whining noise shifting into reverse.
 
I did take a half hour and blow compressed air over the transmission again blowing out pounds of dirt, straw chunks.
I have two axle seals ordered and a blade clutch cable ordered. Going to pull off the deck and go over all the pulleys and blade mandrels and clean further back on the transmission.
 
It will go into free wheel mode now about half the time when i pull out the lever. I sprayed some WD-40 on the action.

Are you talking about part #2?  :
https://www.partselect.com/Models/917203900/Manufacturer/200/Sections/Transaxle/?ModelID=7657666&ModelNum=917203900&mfgModelNum=&ManufactureID=200&Selected=7FDA4CBF7FD305ED97BA303D3F9EC054768B3BE2&Position=11&mfg=Craftsman&Type=Lawn%20Tractor&Mark=11 
 

I don't know off hand (never did one) however as it's a "wear item" I'd suspect you could replace it W/O pulling the transmission.  
 
Obviously the belt guard / guide has to come off.  
 
Start by seeing if there's room to access from the top, again, I'd guess there would be.
Keep pulling parts off (use the parts diagram for reference), till you have clear access.
 
Take your time, take pic's, etc.  It got put there, you can replace it...
 
You may want (with the deck off in any case), see if it's easier to 
jack up the machine and lower the rear end..  
 
There may be a You Tube on it, or similar, checking that may help...
 
.
 

Please post back how it goes...
 
.