Squealing '04 Polaris 600

[makintrax73]

Need a little help diagnosing a squealing/shreiking noise on my sled.

'04 Polaris 600 xc-sp, PERC, electric start, team secondary.

When I am slowing to a stop, or when I am at a stop and the engine begins to wind down I start hearing a "skreeeek....skreeek......skreeeeeeek" from under the engine compartment. The noise only seems to be there while I am slowing down to nearly stopped, or when I am completely stopped and at idle - more often while it is slowing from high idle (4,000) down to regular (idle 1,500 - 2,000). The noise stops once I get the sled rolling again after the stop.

Just back from a 250 mile trip and it did it for the last 150 miles of the trip. Nothing let go, and the sled ran fine, except I shredded a belt about 30 miles into the trip going 70mph down a RR bed. Starts, runs and idles fine. Power is still good.

Any ideas?

 

[snow_monkey]

Need a little help diagnosing a squealing/shreiking noise on my sled.

'04 Polaris 600 xc-sp, PERC, electric start, team secondary.

When I am slowing to a stop, or when I am at a stop and the engine begins to wind down I start hearing a "skreeeek....skreeek......skreeeeeeek" from under the engine compartment. The noise only seems to be there while I am slowing down to nearly stopped, or when I am completely stopped and at idle - more often while it is slowing from high idle (4,000) down to regular (idle 1,500 - 2,000). The noise stops once I get the sled rolling again after the stop.

Just back from a 250 mile trip and it did it for the last 150 miles of the trip. Nothing let go, and the sled ran fine, except I shredded a belt about 30 miles into the trip going 70mph down a RR bed. Starts, runs and idles fine. Power is still good.

Any ideas?

Belt not lined up?

 

[makintrax73]

Belt not lined up?

Possibly. I was meaning to check the side play on the secondary. It struck me as "maybe a little too much" when I put it back on after the pre-season grease up. I'll bring the dial indicator and base with me when I head back up to the sled this weekend.

Unfortunately I don't have any special tool for checking belt alignment. Isn't there a tool you need to clamp on the primary to make sure it is lined up?

 

[snowbuff]

You probably need to adjust your belt deflection. Your new belt is probably too tight and you need to adjust the setting with the dial on the secondary (higher or lower number) to open the secondary so the belt rides lower.

 

[tyeeman]

Have you checked your drive belt deflection measurement? Sometimes it helps to have two people do this but, get yourself a straight edge preferably about 16-20 inches long, lay that across the top of the the drive bely from drive clutch to secondary clutch, now about 1/2 way in between the clutches, maybe favor the drive clutch a bit, grasp the drive belt and pull down towards the belly pan, pull fairly hard. Here's where having the extra hand comes in, take a measurement between the top surface of the belt and the straight edge at the widest point. Typical Polaris measurement is approx 1 1/4 inch between top of the belt and your straight edge. Adjust belt accordingly using the adjuster on the secondary clutch. Too little or too much belt deflection will affect your top end. Too little belt deflection can result in belt squeeling or your sled may even creep forward when at idle.
If you have Your Polaris owners manual it will have some diagrams of what I just typed above.
Note: If your belt is not smooth across the top surface i.e. it's one of those newer belts with the "ribs" on the top, measure from the top of the ribs.
Another measurement perhaps even a double check is this. Take your drive belt and try to slide it backwards (clockwise) through your driven clutch, you're trying to make sure the driven clutch is totally closed and the belt is as far out as it will go. Now measure from the top surface of the sheave of the driven clutch to the top surface of the drive belt. There should be approx 1/8 inch of drive belt (no less) riding above top surface of the driven clutch.
If you just installed a new belt you will have to perform the above steps a couple times in about 500 miles as the new belt will stretch.
Remember, this measuremnt can greatly affect your overall performance.

 

[nickelbagforme]

It is belt deflection. The Team secondary has a 1/4-20 nut locked set screw for adjusting seive seperation. Over time that little set screw can bite in to the aluminum and really get things miss aligned.

I took mine apart cleaned up the mating surfaces and calculated solid spacers to insert, takes a little adjustment with belt wear or new belt but a much better design in my mind. This stay nice and square.

Mine never made that noise again.

 

[makintrax73]

Awesome, I think you guys may have nailed it. I think I tighten up the secondary last year. I never thought to check that with the new belt, but it certainly makes sense that a new belt will tighten it up a bit.

Unfortunately I'm 180 miles from my sled, but I'll try to check back in Monday and let you know if setting the deflection does the trick.

Thanks a ton!