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Q. We have a John Deere Lawn Mower model number L118 42" deck. It is cutting unevenly on one side. The blade on the right side cuts fine but the blade on the left scalps on the left side and leaves a long rough cut on the right of the blade or in the center of the mowing path. We put on new blades, but that didn't help. The blades look even. What else could be wrong?
Answer
Easy, either the deck is not level, or the spindle on the left side is worn out. To level the deck, check the tire pressure, 14psi r, 10 psi f, there are two leveling bolts that attach the deck to the lift. On a level surface, set the mower to the correct cutting height and then using a tape measure, check the height of the blade tips with the blades perpendicular to the mower. Turn the nuts on the leveling bolts to level the mower deck. Also check that the front-rear leveling is correct. The rear of the deck should be 3/4'' to 1'' higher than the front. Use the deck leveling bolts and the front hanger.
If the spindle is worn out, there should be a distinct scraping sound when you run the mower.
Take the mower to your local John Deere dealer and they will be able to fix the problem.
J. Hitt
John Deere Service Tech.
Albany Tractor Company
Easy, either the deck is not level, or the spindle on the left side is worn out. To level the deck, check the tire pressure, 14psi r, 10 psi f, there are two leveling bolts that attach the deck to the lift. On a level surface, set the mower to the correct cutting height and then using a tape measure, check the height of the blade tips with the blades perpendicular to the mower. Turn the nuts on the leveling bolts to level the mower deck. Also check that the front-rear leveling is correct. The rear of the deck should be 3/4'' to 1'' higher than the front. Use the deck leveling bolts and the front hanger.
If the spindle is worn out, there should be a distinct scraping sound when you run the mower.
Take the mower to your local John Deere dealer and they will be able to fix the problem.
J. Hitt
John Deere Service Tech.
Albany Tractor Company
How Often Should I Replace Piston Rings On A Small Engine?
Josh
Hi, I have a Craftsman 42" riding lawn mower with a Briggs 19.5hp twin cylinder. The mower is 12 years old, and its never had the rings done and the head gasket changed. I'm already planning on doing that this winter, so how often after that should I replace them. I was thinking about every 5 years, right? We live in MI so the mower is used from about mid april to late october.
Answer
The way to determine the need for replacing the pistons rings and the head gasket for that matter is to do a compression check. If the compression is below the manufacturer's specks you should consider an overhaul. There are other indications such as excessive oil use or leaking oil, hard starting, and loss of power. But, the compression test is the way to tell what needs to be done. You first take a compression reading, if it is up to specks the rings and valves are ok. If it is low, you squirt some oil into the cylinder and repeat the test. If the compression remains low the valves are leaking, if it increases with the oil, the rings are bad. I like the old saying, if it ain't broke don't fix it. I have fixed things to the point I had to throw them away several time. Good luck. Oil changes and filter changes are probably the most important things to take care of.
The way to determine the need for replacing the pistons rings and the head gasket for that matter is to do a compression check. If the compression is below the manufacturer's specks you should consider an overhaul. There are other indications such as excessive oil use or leaking oil, hard starting, and loss of power. But, the compression test is the way to tell what needs to be done. You first take a compression reading, if it is up to specks the rings and valves are ok. If it is low, you squirt some oil into the cylinder and repeat the test. If the compression remains low the valves are leaking, if it increases with the oil, the rings are bad. I like the old saying, if it ain't broke don't fix it. I have fixed things to the point I had to throw them away several time. Good luck. Oil changes and filter changes are probably the most important things to take care of.
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