1200A Bunker Rake Shudder under load: John Deere Gator  -- Utility ATV Discussion Forum and Review 1200A Bunker Rake Shudder under load: John Deere Gator -- Utility ATV Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > John Deere Gator Forum

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 04-29-2016, 14:21 Post: 195075
Coachlarry



Join Date: Apr 2016
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 1200A Bunker Rake Shudder under load

Thanks to those who helped me resold the bolt issue on the driven. Since repairing it, and replacing the belt with an OEM part, I still have not resolved the issue that caused me to look under the hood. The machine shudders and labors when I first start giving it gas. It smooths out some as it begins to pick up momentum. If someone could checkout these videos, I would appreciate help with diagnosis. The noise seems to be coming from the secondary, but I did see flat spots on the rollers of the primary.

One video show WOT parked, the other shows the shudder while driving.

https://www.youtube.com/watch?v=4qol9RFdP2w

https://www.youtube.com/watch?v=Mb2EsU1ZPvs








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 04-29-2016, 14:49 Post: 195076
Coachlarry



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 1200A Bunker Rake Shudder under load

Is there a way to imbed video on this board?






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 04-29-2016, 17:11 Post: 195077
Trainpilot



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 1200A Bunker Rake Shudder under load

Hey Coach,

Our diesel Gator was behaving similarly. I ended up removing the driven clutch in pieces, as I was not able to get it off splined shaft intact. I bought a replacement off ebay and it now runs smoothly through entire speed range. It's been a while, but I think the primary is pretty easy to overhaul, the secondary not so much, especially if badly worn. We have 4 different types of utv's, and keeping them running is just a small part of my job so it's hard to keep them straight. If faces of driven clutch are not parallel, then gear ratio and speed input to trans is changing rapidly. Running with wheels off ground showed the problem for me pretty easily.






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 04-29-2016, 17:31 Post: 195078
Coachlarry



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 1200A Bunker Rake Shudder under load

Hmm, okay I will start at the secondary. I wonder if spring pressure is too light causing the moveable sheave to open and up shift too soon. Not entirely sure I have that right.






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 04-30-2016, 13:28 Post: 195083
Coachlarry



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 1200A Bunker Rake Shudder under load

I checked the primary agains and snapped a pic. Can someone tell if this condition might cause the shudder? Thank you again?






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 04-30-2016, 14:29 Post: 195084
Coachlarry



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 1200A Bunker Rake Shudder under load





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John Deere Gator: 1200A-Bunker-Rake-Shudder-under-load

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 04-30-2016, 14:31 Post: 195085
Coachlarry



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 1200A Bunker Rake Shudder under load

Was also wondering about the gap between belt and sheave. Is this acceptable? Thank you.





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John Deere Gator: 1200A-Bunker-Rake-Shudder-under-load

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 05-01-2016, 05:32 Post: 195088
gatoraider



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 1200A Bunker Rake Shudder under load

The center spring on the stationary sheave post pushes the clutch open and at rest the flyweights are against the rollers. Since your rollers have good sized grooves in them, that will allow the flyweights to go in further until contacting the roller grooved portion causing a greater gap between clutch sheaves. Also if one or two of the rollers were on the round portion and the other(s)were on the flat portion this would cause an imbalanced condition that could bind the clutch and cause the shuddering. Definitely a good place to start.






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 05-01-2016, 06:25 Post: 195089
Coachlarry



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 1200A Bunker Rake Shudder under load

Excellent. Thank you Gatoraider.- funny, I didn't even realize they were grooved, not having messed with these before; My eyes only "saw" the flat spot. Quite obvious after looking at rebuild kits online. I see several kits around for rebuilding similar clutches (EPI, other snowmobile sources), but they don't seem to have cross references for Deere. Another puzzling matter is the spanner price, considering a similar Briggs unit costs around $8.00. The cost of a new spider is around $150.00, the kits being around $60.00 if I can find the right match. Considering Time to make the removal tools and do the job, can't decide if worth it, other than the enjoyment and satisfaction of fixing over replacing.
Decisions, decisions.






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 05-01-2016, 06:34 Post: 195090
Coachlarry



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 1200A Bunker Rake Shudder under load

Duh, just realized I have to make the spanner, or buy one, either way.






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