20 Most Recent Craftsman 42 in. Deck 19.5hp Lawn Tractor - Page 5 Questions & Answers

can you provide the model number. Its usually under the seat.

the closest thing to a "drive" belt diagram would be in the owners manual http://www.manualslib.com/manual/487688/Craftsman-917-276051.html?page=38#manual the horizontal (front) end would be to the pulley at the engine that the deck belt(s) are not attached to. There is a set of mid pulleys where the direction is changed from horizontal to vertical for attachment to the transaxle.

check out the manual at http://www.managemylife.com/mmh/pd_download/lis_pdf/OWNM/L0909237.pdf page 20

You have to hold the spring and deflector in the loaded position (forcing against the spring force) while you feed the pin thru the deflector and spring and back thru the deflector and intor the deck bracket.

The deck has an idler pulley that keeps tension on the belt. The idler pulley is mounted on a pivoting bracket, that has a spring which provides the tension. You have to move the bracket so as to take the tension off the belt, thereby allowing you to slip the belt off the other drive pulleys

Have you done anything to find a problem?

here is link for owners manual. http://www.managemylife.com/mmh/pd_download/lis_pdf/OWNM/L0709180.pdf

what is the settings for the spark plug gaps in a Briggs and Stratton 19.5 engine 46 in riding lawnmower

You can either remove the deck first which will make the spring easier to get to or with the deck all the way down on the ground.

There should be an adjustment on both sides of the deck. Move the nut up or down to raise of lower it.

Probably a fuel issue. Backfiring is usually a timing or fuel issue. One can cause the other. As this is an engine issue, please post model and type.

Post the model and type please.

Misaligned pulleys, idler spring, bent engine pulley, belt keepers missing, bad or wrong size belt etc.

If you would look under your seat and post he model number.. probably starts with 917.. I could help you

Need to check the bearings on the shaft

Brand ? Name ? Model ? Any other info ? Type of Engine ? Engine Model # , Type and Trim number ? How about the exact model number off the sticker from under the seat and in the same format including any hyphens or periods. Your number 917255800 comes back with zero hits until you provide further information.

A little wd40 on each pulley arm assembly, make sure they move freely and good time to check the belt and belt brakes if equipped. I assume your belt was recently removed or installed and is not following the correct pattern. Is this the issue ? It's very common for people to install their belt around pulley in different direction and belt is not ( or is ) riding on the Idler pulley, other, or guides incorrectly. Under the chassis somewhere is a label for belt pattern and is usually under the left side foot grip of the chassis. ( Lifting the mower ? ) Be sure to have some chunks of wood available. I use 2x4 and 2x6 scrap to hold up the machines without use of jackstands or any jack which causes damage.

Must be sitting on the seat with blade disconnected and foot on the brake.

There should be a decal on the deck with the diagram. To change, first remove belt from engine pulley.(front pulley under emgine) and go from there.