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FInd and buy a deck level guage (makes it so much easier) photo.Adjust the front tire pressures to 14 psi. Set the rear tires to 10 psi. Make sure that the mower is on level ground,concrete driveway or garage floor. Set you deck height knob to 2.5 inches. Move the blades to where the blade tips are pointing to the side of the mower deck. Level the deck side to side by adjusting the lift link nuts,15mm or 17mm wrench. Get the side to side as level and possible and close to a number or mark on the guage. Move the blade tips to the front of the mower deck. Check the front to back and have a 1/8" to 1/4" lower on the front of the blades than the back. 18mm and 19mm wrenches for the front adjusting bracket.
YOUR GOING HAVE TO ADJUST SCALP ROLLERS OK THIS IS ABOUT ALL YOU DO LIFT DECK UP MEASURE THE BLADES TO THE DECK WHAT YOUR CHECKING FOR IS A BAD SPINDALL GRAB YOUR BLADE WITH GLOVED HANDS JANK BACK AND FORTH 9F THAT SPINDEL MOVES REPLACE IT CHACK OF OF THEM YANK THE HELL OUT THEM ALL THE SPINDEL THEN LOOK AT SPINDEL SUPPORT PLATE MAKE SURE NON OF THEM OR BENT FORWARD OR BACK WARD STICK A SMALL RULER ACROSS TO SEE IF FLAT ALL THE WAY AROUND IT CHECK ALL OF THEM LIKE THIS THIS THE LAST THING YOU CAN DO YOU DONE EVERYTHING ELSE IT COULD BE IM REALLY CURIOS IF THIS DOENT FIX IT WHAT IT COULD BE HAVE YOU CHECKED THE ALINEMENT DECK TO MOWER IT ISNT OFF CENTER WERE IT COULD BE PUSHING DECK TO THE SIDE THATS ALL I NO WHAT TO DO THE RED NECK LET ME NO WHATS HAPPENS
Ideally, the blades should be level when measured on a flat concrete surface. Otherwise, they'll cut shallow trenches - front if the deck is pitched forward, rear if the deck is pitched rearward. If the blades are level, they'll cut flat all the way across.
When levelling the deck, rotate the blades so that the right blade has one of its cutting edges at or near the right side center of the deck. Do the opposite with the left. Measure to the blades from the level ground, not to the deck. Try leveling that way.
Well the plane of the spinning blades obviously is not parallel to the ground. While the ground will never be level, do what you can and first get the mower on a good piece of flat concrete. Measure distance between each corner of the mower deck to the concrete. You have had the deck off, the deck hang mechanisms have some adjustment so you can lower the front of the deck relative to the rear and vice versa, and lower the left relative to the right side, and vice versa. Look for threaded rods with adjusting nuts, pins which can go into different holes, etc.
As a last resort you could google "poulan, mower, manual" which would take you to their website and you can download the manual for the mower. All my mowers, MTD, Husq, Simplicity, came with a manual and had explicit instructions for this process. Most all these mowers are made by Roper or AYP and you may find information by googling those companies.
1-----------tire pressure? 14 front 10 rear
start with a level mower on a level surface
2------------deck level side to side?
3------------deck level front to back? (front can be 3/8 lower than back)
4-----------deck hangers bent or hung up?
5------------blades even when pointing at each other? no more than 1/8 high or low
6------------blades dull or upside down? turned up ends go towards deck
7---------------incorrect blades for mower?
8------------deck lifting mechanism should pick up deck evenly and drop evenly?
9-----------under the deck need cleaning because it is packed with grass?
you need to bring all 3 blades to point at each other on the deck
do they all look the same?
aLL 3 should meet each other evenly with no more than 1/8th inch difference high or low point to point.
the stump strike could have bent the deck on that side
also be sure the fin side of the blades are pointing towards the deck when installed.
check that your deck is level on a level surface and the air pressure in all for tires are up to recommended pressure.
most of the time 14psi front and 10psi rear