If you can't get a diagram , tell us what is happening and we may be able to help.

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.

Sometimes, just sometimes if you call the parts department at your local dealer, the guy might just pull the diagram up on the computer and e-mail a copy. I have had this work with car dealers where they sent me a needed portion of a wiring diagram or other assembly if you catch em in a good mood at a good time.

Solution Number: 64246 Solution Summary: Engine Runs Rich, Fouls Plugs, or Low Power - GT245 GX255 & GX335 Tractors with EXTERNAL Vent Carburetors. Publication Date: Jul 25 2005 -------------------------------------------------------------------------------- **Paper copies of solutions may not be the most current solutions** Complaint or Symptom: FH601V Engine with external vent carburetor runs rich, fouls spark plug(s), blows black smoke out exhaust, misfires, is low on power, etc. Problem or Situation: Engine fouls spark plug(s) in low hours of useage. Plug(s) are black and dry (gas fouled) sooty. Technician has already followed SIB # 03-11-30-6 on the carburetor vent tube change, with no improvement. Customer is running unit at WOT while mowing. Customer is using fresh fuel (less than 30 days old.) ENGINE IS FH601V WITH EXTERNALLY VENTED CARBURETOR (carb marked 15003-7077). Current Operator's Manuals and Technical Manuals say to oil the foam air pre-filter element, this is NOT correct. Do NOT oil the foam element. Manuals are in the process of being revised. Solution: Verify longer carburetor vent tube is installed and routed correctly. It should extend below the tractor's frame. Verify carburetor vent tube is not kinked, blocked, or restricted. Any restriction contributes to rich running. (See SIB # 03-11-30-6 or DTAC solution # 60154.) If tractor has optional BM20820 tubular bumper installed, follow DTAC solution # 55586 to verify the exhaust deflector from the kit was installed. Air flow through the air filter element may be restricted due to dirt accumulation in the pleats of the filter. Replace air filter paper element and foam filter element. (Don't just check it, replace it.) (NOTE: Foam filter element should NOT be oiled when installing.) Replace with M150403 air filter. NOTE: Certain GT245, GX255, and GX335 Lawn & Garden tractors were manufactured with incorrect paper air filter elements. Make sure to replace both the paper air filter element and the foam pre-filter element to insure the correct air filter is clean and being used. The more restrictive, incorrect air filter causes restricted air flow to the engine, therefore this may cause a rich running condition in externally vented carburetors (marked 15003-7077). Parts: Element M150403 (1) Paper Air Filter (marked "11013-7024", to be used for External vented carburetors only.) Element M140295 (1) Foam Air Filter Additional Information: If the rich running, plug fouling condition returns after implementing the above solution, then (and only then) order & install the following parts: (1) M153165 Main Jet (#126) (1) M147610 Main Jet (#130) (2) M805853 Spark Plugs (2) M141357 Carburetor Gaskets (1) M140260 Air Filter Gasket In addition, order & install new paper (M150403) & foam (M140295) air filter elements. NOTE: The #126 main jet should be installed in the number 1 cylinder marked "L", and the #130 main jet should be installed in the number 2 cylinder makred "R". Tighten main jets to 0.7 N-m (6 lb-in). Reference respective Technical Manual for this procedure. Again, do not install these "additional" parts unless the "Solution" above has first been tried. If these leaner main jets are installed in all tractors, some tractors may exhibit a lean running condition.