checked tire pressure and that was not the problem
21 Hp 42″ Deck, Ys 4500 Lawn Tractor

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Measure the height of cut from the ground to the bottom of the deck all the way around, if it is the same the blade or bearing housing is at fault, if it is lower on the left look for a bent or broken mount from the deck to the tractor on that side.

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Sharpening or replacing the mower blades is also the answer if grass tips look ragged or tattered instead of cleanly cut. Blade vibration also causes an uneven cut. To eliminate vibration, replace unbalanced blades and worn mandrels. Replace a worn blade belt because a worn belt won`t spin the blades correctly.
M170642: Mower Blade, 42 inch, Cut Length 206 mm (8.1 inch)
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.

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Left side blade cuts about an inch lower than right side , the left 21″ when cutting is about an inch lower than the right 21″, looks terrible, checked tire pressure and that was not the problem
ANSWER : Measure the height of cut from the ground to the bottom of the deck all the way around, if it is the same the blade or bearing housing is at fault, if it is lower on the left look for a bent or broken mount from the deck to the tractor on that side.

42 inch mower cuts uneven, what is the problem?
ANSWER : Several things here could be the problem. Check to see if mower deck is level, measure distance on both side on a level surface. Check tire’s for low air. If you’ve replace the mandrel’s lately, some have a left & right side & if not put back together properly this will cause uneven cutting

The blades are cutting unevenly – Craftsman 17.5 hp 42 in. Deck Lawn Tractor – CA Model
ANSWER : I know this will sound a little crazy, but check the air pressure in you tires. My neighbor had the same problem. The tires looked okay until he sat on the mower. One of the rear tires was low which caused the mower to sit lower on one side. Next check the linkages on the deck to make sure they are hooked up and haven’t fell off.

One side of the tractor is cutting higher than the other
ANSWER : Make sure you don’t have a flat tire, first. If tires are OK, the mower deck may need to be leveled. Look at the arms that suspend the deck under the belly of the tractor. Make sure there isn’t a branch or something caught in the mechanism, keeping the deck from hanging down where it should. If all that is OK, then the deck must be re-leveled. Park on pavement. Find the nuts on the suspension arms that can be loosened up, turned to a different position, then retightened. Use a ruler or a mark on a block of wood to ensure the left blade tip is the same distance from the ground as the right blade tip.

When I engage the mower blades,It makes a loud noise under the mower deck and the right side cut lower than the left side leaving a pattern in my yard.Please help grass is getting tall
ANSWER : It sounds a lot like the balancer is loose. You can most likely fix this yourself, here’s how: pull the spark plug wire off the plug, tilt the lawnmower up to expose the blade, rock the blade to see if it is loose on the shaft, if it is all you have to do is tighten the bolt so the blade and the balancer are flush to the shaft. That should fix your noise and uneven cut problem. If that doesn’t fix it, let me know here, ok? Cheers!

Couple of guys tried to help me on this, perhaps you guys could come back. I forgot to mention there is a pressure tank bladder type on the discharge side. Could the air in this tank be messing with the prime. I checked the intake. It has water in it after bleeding air from the discharge system where before it was dry before purging air. I think there is air in the system and wonder if it is coming from the pressure tank?. i open up one of the discharge valves and a lot of air comes out. Should I put a valve on the pressure tank to take it off line until I get water from the well?

Mar 12, 2010 – Could it be the check valve? I took it off and the flap appears to be working correctly. This well has been here a long time. Never given me any problems. I do have galvenized couplers on the discharge and intake sides. Old. Could these be leaking even though they show no sign of water? The discharge is able to hold 30 pounds easily overnight. I do not hear any vacuum in the intake when I take it off. Could the pipe to the well have a leak? I know I would have to insert a sleeve but I do not want to go through the hassle if I do not have to. I had put on a brand new pump from the hardware store that did the same thing so I think that would elliminate the pump as being the problem.
I disconnected it for the winter and rehooked it up. The galvanized couplers on the discharge and pump side are old but do not appear to be leakeing as I taped them well. The check valve seems to be functioning well as I took it off and the flap works correctly. The well is not pulling water. there does not appear to be a vacuum on the check vale when I losen it. could the check valve be bad? I am aware I might have to resleeve the well, but do not want to hassle with this if I do not have to. I want to eliminate everything else first. i put another brand new pump on it to see if it was that. That partiuclar pump which was the same thng did not work either.
I took the pump nose off and looked at it. The one way valve appears to be working fine. The impeller is working fine also evidenced by when I turn it on witht the discharge cap off, water shoots out. When I open one of the discharge valves and turn it on, the pressure drops to 10lbs. At this point the prime water has moved through the pipe and and the pump does not soound like it has any water in it. I pull the cap off and have to “reprime it again.” It again goes back to the pressure gauage rapidly fluctuating while pump on. I disconnect pump on intake side I hear no vacuum. The guage is on the discharge side. The seals on the pump nose do not look frayed or damaged. The pump is not leaking water in any of the joints. The pipes on discharge and well side do not appear to be leaking.

ANSWER : My friend, please boil your question down. Your title has to do with riding mowers but the leaking, bladder, impeller, air bubbles, pressure tank, check valve comments seem to be migrating toward a pump of some kind – well? spa? pool? irrigation?

Briefly, any system that involves a water source, a water moving device, water storage device and ultimate useage is subject to leaks … into the system and out of the system. If this is a well and you have air in your system, your pump may be sucking air at the well or any loose connection between the tip of the pipe and the inlet to the pump. Your bladder could have failed but from what I can get from your comments, this is not the case. On the pressure side, neither air nor water will leak in … only out.

Please recheck all connections. Make sure your check valve is installed correctly and not leaking. The check valve assists the foot valve, which may have failed.

I am more inclined to think your well may be at the end of its useful life. To prove or disprove, you could have a plumber put a vacuum gage on your pump. He or she can answer this question is about 90 seconds based on this test. Expect to pay for one hour of time, which will be less than the time you have already invested in your project.

42″ deck not cutting level
ANSWER : I had a similar problem, and the problem was fixed by airing up one of my front tires. This may not be all of the problem, but you should eliminate this before you go adjusting…….
Just a thought, –W/D–

How do I get my mower deck set properly? Any tricks?
ANSWER : Check your front tire air pressures