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If hydros are in bypass (bypass rods pulled rearward and locked) the drive wheels are free to turn and you should be able to move the machine by pushing manually when brake is OFF.
If hydros are engaged (bypass rods unlocked and forward) the wheels will not turn when you attempt to move by hand.
If you confirm you can manually move the mower when in bypass you can't move machine when hydros engaged, then likely an issue with the pump drive belt. This belt wraps around both hydro pumps, upper engine pulley (above the electric PTO clutch), and a tensioner pulley.
If both hydro pump cooling fans are spinning when engine is running then the pump drive belt is in place and the problem is elsewhere.
If the unit stopped moving at once. I suggest checking the belt. It is very unlikely both Hydro-Gear units would fail at the same time. check under the mower, and check on top of the transmissions, you should see the drive belt running between both transmissions and the engine.
under the deck ether running backwards are forwards depending what drive your useing but all under deck you might have to dig thrugh the grass but its there unless it broke then look for the pully on the blade shaft
Check the drive belts first. and make sure the hydro release lever is in the correct position. If it is not- you can push the lawn tractor and have the rear wheels turn. It sometimes doubles as a "Forward" "Neutral" "Reverse" lever on other brands of lawn tractor.
The belts should be in their guides and pulley grooves- check to make sure it does not have a hidden break by having the engine off, and pulling on the belt.
Lastly, check to make sure the hydro itself is not out of oil or low on oil. It uses low viscosity "HyGard" oil. Capacity if you drain the old oil out and refill is 4.6 quarts. Look for a leak if the level is low.
If it still does not move, make sure the levers are set so you are in forward motion positions, and push- if the rear wheels move there is a problem in the hydro unit.
Hi,your machine is probably a hydro static drive & needs the oil changed in the transmission.
But the pump that pushes the oil around inside it is probably to far gone for repair.
I am not sure about this machine but we have had a simlar problem with a rideon this summer.
It has one pedal that you push forward for forward movement & rearwards to go backwards.
We were able to get a new drive pump for the transmission but it was expensive, most of these machines have nearly the same transmissions so getting the parts should be no problem.
Also we do know is that there are some machines with oil emersed discs inside (like wet type clutches) these also need regular oil changes & can burn out without oil. (Bronze plated disc)
You would need to find the name plate on the transmission & there should also be model & serial no on the casing.
Once you have these details you should be able to find transmission parts lists online.
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