Question edited for clarity maker name in full.
Question moved from Hewlett Packard.
Diagrams and videos. It would have been useful to have the model number of the mower. My normal search query would be
'John Deere model replace (or service) carburetor'. Plus perhaps adding the work 'linkage' or 'choke'. All this information is out there as well as John Deere Service Manuals.
https://www.google.com/search?q=john+deere+throttle+linkage+diagram
Service manuals
https://www.google.com/search?q=john+deere+mower+service+manual
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A sheared flywheel key will not. This version of the Kohler CV employs fixed timing with a basic ignition module. A sheared flywheel key would not prevent spark but rather produce spark at the wrong time.
A simple test would be to disconnect the kill wire at the module and then check spark.
The module listed is JD MIU11542. They appear to be near symetrical and it may be possible (?) to install mirrored. The ignition module will not operate with a reversed field. Be sure to match the orientation of the working ignition module.
Edited text with a wild guess at the maker. Make model (what it is) in all questions please.
Category moved to John Deere Tractor.
If it was working before, there is no need to worry about the firing order as that never changes. Things to look at;
Clean and correctly gapped spark plugs,
Clean gas,
Fuel filter?
and a clean carburetor, float bowl and jets.
John Deere 3020 Engine
Engine Detail
John Deere
Firing order:
Starter volts:
Oil capacity:
9 qts 8.5 L
13 more rows
•
Jul. 10, 2020
This John Deere model 3020 Gas and Diesel Tractor Service Manual is a digitally enhanced reproduction of the original manufacturer-issued Shop Manual.
US$120.98 · In stock
This is a new reprint of John Deere Service Manual SM2041 for the John Deere 3000 Series Tractors shown above. It is dated June 1961. Includes 3010 & 3020.
Question edited for clarity.
Question moved to John Deere.
Are you sure the new belt was the right size? It shouldn't be on maximum tension and still come off. They do have a history of throwing belts. Take a look at the videos.
https://www.google.com/search?q=JOHN+DEERE+LA135+Belt+comes+off
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There's little in free information available regarding 997 DTC errors other than the handful in the owners manual.The only two temperature sensors I find in the wiring diagram are engine and transmission and only the transmission temperature interrupts the PTO so I believe the "start thermal protection" is a hydrostat pump overheat state and shutting down the PTO is their way to protect the pump.My only suggestion is make sure the hydro pump is clean and clear of debris and service the hydro, new filter and replace fluid.
With the mower turned OFF check the blades to see if they aren't bent and if it spins freely. There should be resistance when you hand turn the blades. A bent blade can jam and lock up the drive system. If the blade spins freely and has no resistance check the drive belts from the blade pulley to the gears that run the blades. Hopefully you have just had a drive belt come loose or break, a reasonably cheap and easy fix. If the belts are OK you will need a mower mechanic to look at the gearing for the blades.
