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It sounds like the drive belt has slipped off a pulley. With fuel turned off, tilt the mower to one side- so the fuel cap is at the highest point of the tank, and cannot leak fuel out the breather hole. One belt will drive from the engine and the other end goes around an idler pulley. The other belt will drive from the axle to an idler pulley and will be slightly loose. This is the one that may have slipped from its position and not be contacting one or more pulleys when tightened. There should be a pair of pulleys, each being one side of the drive belt. Pressing the forward control should move one pulley onto the drive belt and simultaneously tighten the axle belt. Pressing the reverse control should engage the other pulley(on the opposite side of the belt) and also tighten the axle belt. This loose belt may have been bumped off one or more pulleys in the collision, and be sitting between the pulley and the guide/guard. With the ENGINE OFF, and the forward/reverse selector in neutral you should be able to force the loose belt back over the pulley.
Whether the forward/reverse mechanism drives the engine or axle pulley, the principle will be the same.
its more than likly a bad check valve or a by pass is clogged make sure change oil a filter in hydrostat after fix best while they are fixing it to fi9x check valve 100.00 to put new bypass 50.00 to change oil 100.00, 250.00 to be safe
do you have the complete model number from the data tag on the mower frame? there are two typical systems for these machines, both require the belt to be tight and not slipping at the crank shaft, and the pulley on the trans-axle to not be slipping on its shaft, the older style trans axle uses a belt tensioner system to tighten the belt and turn the pulley, i.e. if the pulley turns then the axle should too. this can be checked by hand with the axle and belt removed. the second system is a clutch style axle that has a constantly tight belt and uses a small cable controlled lever on the transmission housing to engage a drive clutch inside the transaxle, if moving the lever forward doesn't cause the axle to turn as the pulley and shaft are turning the clutch mechanism is usually toast. with both of these systems one should also note whether the axle is turning inside the wheels when they are on the ground, the over running clutch sprags inside the drive gears could be stuck causing the wheels to turn without resistance applied, but stall when in contact with the ground.
while inspecting the trans axle note any wobble or free play in the axles or input shaft, this will indicate a worn case or bearing, resulting in a slipping gear in the trans axle.
The last time I had a Honda mower in my repair shop I noticed that Honda doesnt do individual parts on its transmissions for mowers OR tillers.
You can fix this mower...but the transaxles are a bit expensive. Honda mowers do tend to be worth it though.
If the axle broke cleanly maybe someone would weld it back together?
I mean, the wheels dont turn that fast that balance would be an issue right? And I am sure the axle metal is cold rolled steel....which is to say it isnt thin cast material that would resist welding. If you take the transmission out of your mower and just take the parts to a good jobber maybe they would give it a try for 10-20 bucks? Dont expect a guarantee...but, for 20 bucks most shops wont even pick up a mower let alone try to fix it.
If this gives you another couple of years of service that would give you time to consider a replacement mower when the unit needs service again.
Check the hydraulic oil level for the hydrostat drives(if it has a reserve tank located under the seat. Some ZT's don't have the reserve tank. Don't over fill that tank. 1/4 inch above the bottom is all it needs.)
Also, check the steering arm bolts. Very often they work themselves loose and the arm doesn't pull the valve rod that controls the hydrostat unit.
could be a linkage came loose, or that the fluid level in trans is low, has nothing to do with engine but the hydros are prone to failure, also the hydro is driven by a vbelt which can stretch and mimic a trans problem