Your part number can be identified by looking in your operators manual, under the seat of your lawn tractor (select models), accessing the maintenance reminder sheets or by carefully inspecting the old part and identifying the markings (Ex. GX20250).
Are John Deere mower decks interchangeable? – Related Questions
For most effective results, a lawn mower deck should have a pitch of 1/8-inch to 1/2-inch between the height of the deck rear to the height of the deck front. Naturally, this makes the sweet spot about 1/4-inch of pitch, depending on the type of mower.
Mower deck gauge wheels should be properly adjusted to prevent scalping grass on uneven terrain. The bottom of the wheels should sit approximately 1/8-1/2 of an inch from the ground, depending on your cutting height.
For most effective results, a lawn mower deck should have a pitch, or height difference of 1/8-inch to 1/2-inch between the front of the deck to the back of the deck.
Dull or Damaged Blades
Rows or streaks of uncut grass in your lawn may be the result of your lawnmower’s cutting blades being dull or otherwise damaged. Dull blades are the result of normal wear and tear from mowing. The blades can be sharpened with a bench grinder by you or a professional.
Turn the adjusting lock nut clockwise to raise the mower and counterclockwise to lower it. Measure from the blade to the ground again on both sides and adjust until the difference between the blade tip heights are within ⅛ -inch. Rotate the blades so that their direction is now front to back.
3 Inches or 3 1/2 Inches
A lawn should be mowed at 3 inches or taller. The ideal mowing height would be 3 inches to 3.5 inches in height. To learn more about the three most common lawn mowing mistakes that homeowners frequently repeat, please read our blog about the most common lawn mowing mistakes homeowners make.
Some of the most common causes of a lawn mower cutting unevenly include damaged wheels, a loose, bent or dull mower blade, a bent crankshaft, and a clogged or damaged cutting deck.
The most common causes of a lawn mower not mulching properly are a damaged or dull mower blade, having the wrong sort of blade installed, a clogged cutting deck, having the cutting deck set too low and trying to go too fast. What is this?
Heavy mowers will start to sink into the grass and whip up moisture as they cut your grass, which causes grass to clump in matted wet wads that clog the deck of your mower and its catcher.