javert10 years ago
john deere stx38 pto wont engageComments (32)Hey folks, so I'm posting this follow up in my original thread because I think I have a related problem. Last year, I replaced the PTO drive belt and the mower blade drive belts on my inherited JD STX 38 Yellow Deck. Today I took the mower out (NOT the first time this season) and had some serious issues. First of all, the grass is tall - 18-24 inches. I had the mower height set to the tallest height. The grass may have also been slightly damp - although not wet. I was able to cut basically one path, then I realized that although the PTO was engaged, the blades weren't cutting the grass. I was going at the slowest speed (first gear) and even tried cutting using only 1/2 of the mower deck width at a time - no help. I took the mower back to my driveway, cleared out lots of old clumped grass from the blades, and started the mower and the PTO. The blades were definitely turning. I turned off the mower again, and noticed that the PTO drive belt is looking terrible - it's all pitted and slack - it's not tight around the PTO shaft! So, my theory is this: the PTO drive belt is shot again (Although not broken yet) - so the blade spin when I'm not trying to cut anything, but when I come in contact with any sort of grass of substance, the slack belt is "slipping" and resulting in the blades not cutting? Does this make sense? Solution: replace the belt AGAIN???? A few more things to note: 1) I tried cutting shorter grass and drier grass and had very little luck. 2) why would my PTO drive belt, just replaced a year ago, be so shredded already? That's worrisome... any advice would be appreciated. thanks....See More
John Deer STX38 won't startComments (11)Deere wiring diagrams don't actually tell where to look for an over-current device, at least not in words. And looking at a few STX diagrams online I see that Deere may even have used (on various production years) a fuse, or a circuit breaker, or even a fusible link...........to accomplish the same protection for this circuit. I can tell you in electrical terms where you will need to begin searching for whichever type of interrupter yours has, but you will still need to physically do the hunting. The fuse, circuit breaker, or the fusible link will be part of a circuit coming off of the BATTERY CABLE POST on the STARTER SOLENOID (not the solenoid starter cable post) . The circuit will be a small wire that is on the same post of the starter solenoid as the cable coming from the battery + post. If you can locate that wire and trace it you should find whatever your model uses. The circuit originates at the starter solenoid and ends at the key switch, and the circuit is in fact the hot feed for the key switch....See More
John Deere STX 38- won't startComments (5)2 things to check right off. Check for spark at the plug. You can do this by removing the spark plug, connecting the plug back to the spark cable, then lay the plug on a metal part of the engine where you can see the spark end of the plug. Watch for spark while someone sits in the seat and cranks the engine. If you do not have spark, post back stating that. If you have spark, put the plug back in and go to the next step. Remove the air cleaner and spray a burst of spray carb cleaner into the carb, or drop a couple of teaspoons of gasoline into the carb and immediately try to start the engine. If the engine runs for a second or 2, there is a problem with the fuel system not delivering fuel to the engine. DO NOT use "ether starting fluid" in a small, air cooled engine. Do this and post back....See More
john deere stx38 pto intermittentComments (3)Always listen to mownie, and I agree with his assessment. Charge your battery, and check the electrical connections, paying particular attention to the battery cables - both of them. Also take a look at all the wiring and connections that feed the PTO, as well as the engine ground wire. Intermittent problems frequently result from corroded connections and/or frayed wires. Among the reasons to run at full throttle include battery-charging, as mownie mentioned, blade speed, and ensuring good oil flow. Your Kohler engine has an oil pump, but some engines are splash lubed, which makes high engine speed even more important. As a general rule, virtually all small engines should normally be operated at (or very near) full throttle. Post back if these suggestions don't fix your problem; there are a number of possibilities....See More
bill_kapaun10 years ago
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