Top 20 Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model - Page 7 Questions & Answers

Incorrect valve adjustment, especially on OHV motors that causes a backfire can cause the sheer pin to break. Obviously this saves the motor from worse damage. Also, sudden stops caused by hitting something like a log or stump with engaged blades have broken the pins before. On an older motor I had one sheer because the piston rod was a little loose off the crank and the slop was causing the motor to bind. Obviously this did internal damage but the sheer momentum of the motor spinning a heavy flywheel no suddenly stopping broke the pin. Lastly, the magnets on the flywheel could be hitting the coil pack, binding up causing the pin to snap. Be sure to check if the space is gapped correctly. And don't buy cheap pins or generic pins. There should be no slop whatsoever. You almost have to pound it into the slot. Slop equals a much high ER chance of breaking for no reason at all.

Btw, I’m available to help over the phone in case u need at

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Front of engine.

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Probably a fuel issue.

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Can you explain a bit more because the front engine pully is suppose to be tight. It bolts directly to the crankshaft and it's got a keyway into it. Check the keyway to see if the pully's key has sheared off. It it has then you need to fix that first. i suggest you check for shafing somewhere else in the other belt pullys for scarring or a derailment rod loose or something.

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Did you check the charge on your battery?

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Go to you tube On line adjust valves craftsman 17.5 mower

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usually on a tag on the rear body under the seat.

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Yes. Verify it is the battery by jumping mower off with car battery. If turns over, replace battery. If cannot turnover by jumping, try bypassing start solenoid by tapping positive cable to battery post on starter. Starter should turn. If starter doesn't turn, have starter tested.

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I need the model number of the engine for this.

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Has to be your stater or magneto going bad or had rust on it...

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The easiest way is to loosen the coils two bolts, slide it back and place a business card (feeler gauge takes to much time), in between the coil and the flywheel. Turn the flywheel until the magnets pull the coil in against the flywheel. Tighten the flywheel nuts and remove your business card.

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I use straight 30wt.

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dont know, but if you start at the positive battery terminal and just follow the wire, you will bump into one fairly quickly

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Low compression most likely. Try changing the spark plug and change the oil. Sometimes the mower won't start if the oil level is too low. If that doesn't correct the problem, then you need to either rebuild the engine or replace it.

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are you saying you get no click when turning the key? the starter solenoid should make a clicking sound atleast...sounds more like a safety switch. either located under the seat or on the clutch /brake pedal is not allowing the circuit to be complete so you can start the machine. if the blades are engaged it won't start/ if brake is not depressed it won't start/ if your not sitting in the seat it won't start...each one of these areas have a microswitch that can stop it from starting when turning the key. under the seat its usually a large round button you can depress several times then try again...disconnect and reconnect all the microswitches and look for corrosion on the electrical connections when you do. I hope this helps you

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Mine is a closed system and does not ever need changing so they say. I have the 20 hp Briggs and Stratton with the 42 inch deck. I would imagine it is the same engine but the CA model loses 2.5hp because of emission restrictions.

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Sounds like you should remove the deck, flip it upside down and use the blade to hold the spindle while you remove the bolt. if its still too hard to remove, spray it with wd40 or liquid wrench and wait a while and try it again.

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