Anybody have this odd belt slip?

indy_500

indy_500

Well-known member
So the sleds an 05 Switchback 600 144". I just installed a 2" paddle track on it and regeared (drop tooth on top and up 1 on bottom) now before you think that had something to do with it, it did it riding around my yard with stock gearing and track. The only changes I've made to the clutches are I added Delrin washers in the secondary (it has a team secondary). I've adjusted the track between 1/4" sag and 1.5" sag. I've tried 3 belts. I've had the primary apart, literally EVERYTHING looks brand new. The sled has 1400 miles on it no rusting no wearing in clutches whatsoever all the belts I tried were dang near brand new. Now, before you think track ratchet, not it is not the track ratcheting. This only happens upon SUPER SLOW acceleration from a dead stop. Once I'm going its perfectly fine. Now I held the hood open and the clutch guard and watched as I slowly accelerated. The clutch would grab and release, grab and release, grab and release, hence the belt slipping. Am I going crazy here without snow to test this? I mean my C&A XTX skis with 10" carbides dig into my grass HARD, being a longer track also, is there too much friction causing the sled to do this? I'm out of ideas, just wondering if anyones had a similar scenario!
 
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snoluver1

Active member
Did you measure your belt deflection? Also belt side clearance in the pully with a NEW belt, not "dang near" new? Also, what primary spring?
 
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whitedust

Well-known member
Don't know if this is it but have had brand new belt slip in clutch after changing found it was not in correct position in clutch kind of stuck between sheaves acted like you said & freaked me out thought the clutch blew. Just stared at clutch trailside then thought I have to get home so powered up & fell into place & was fine. I hope this is as simple as that.:)
 
srt20

srt20

Active member
Super slow acceleration is bad. The primary is up to xxx rpm, when the weights overcome the spring, the sheaves collapse. Once it grabs the belt, it loses some rpm. Lose some rpm, clutch releases some of the pressure on the belt and the belt slips. Don't pussyfoot it, grab the go lever with authority.
 
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whitedust

Well-known member
srt20 said:
Super slow acceleration is bad. The primary is up to xxx rpm, when the weights overcome the spring, the sheaves collapse. Once it grabs the belt, it loses some rpm. Lose some rpm, clutch lets releases some of the pressure on the belt and the belt slips. Don't pussyfoot it, grab the go lever with authority.
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Yep I think it is something goofy too may not be a problem in real conditions.
 
indy_500

indy_500

Well-known member
snoluver1 said:
Did you measure your belt deflection? Also belt side clearance in the pully with a NEW belt, not "dang near" new? Also, what primary spring?
Click to expand...

120/340 black green belt deflection looks good did not measure as long as it sits 1/8" above secondary I never worry about it...

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srt20 said:
Super slow acceleration is bad. The primary is up to xxx rpm, when the weights overcome the spring, the sheaves collapse. Once it grabs the belt, it loses some rpm. Lose some rpm, clutch releases some of the pressure on the belt and the belt slips. Don't pussyfoot it, grab the go lever with authority.
Click to expand...

whitedust said:
Yep I think it is something goofy too may not be a problem in real conditions.
Click to expand...

That is exactly what I'm thinking. I guess only time will tell when it gets on the snow! Keep suggestions comong
 
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rp7x

Well-known member
belt defelt

adjust it till the belt just drags then back it off a little , x2 on the pussy footin
 
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raceinsnow

New member
It sounds like the belt might be hour glass shaped in spots.Did you wash the belt and clean the clutch surfaces,that will cause a skip / slip. Is everything in the primary new,the weights could have notches in the weights from the rollers when it idles and viberates.
 
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lenny

Guest
I'd pour sea and snow all over the sheves, ot just soak the belt in engine oil for 6 months to make it pliable again,,,sorry Indy,, I just had to!

I know nottin
 
X

xcr440

Well-known member
Does it do it on a stand?

I'd be waiting for snow like the rest of us at this point. Working on the sled won't make the snow get here any sooner......
 
indy_500

indy_500

Well-known member
Doesn't do it on stand 2 of the belts were brand new 1 has 1400 miles on it clutch looks perfect
 
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snoluver1

Active member
If deflection is good you still need to measure side clearance in the primary. Should be between. 020-.060". If thats good, I would throw a new spring at it and see what happens. They are cheap and if its original it should be replaced anyway, even with the low miles. Its been sitting in there under compresion for almost ten years.
 
indy_500

indy_500

Well-known member
snoluver1 said:
If deflection is good you still need to measure side clearance in the primary. Should be between. 020-.060". If thats good, I would throw a new spring at it and see what happens. They are cheap and if its original it should be replaced anyway, even with the low miles. Its been sitting in there under compresion for almost ten years.
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I was thinking about trying another spring I had on the shelf but they r all very used! Will probably order a 140 or 150/340 spring tonight
 
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