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Jonsered 2036/2040 3/8 rim drive clutch + rim.

Discussion in 'Chainsaw' started by jonsereds 621, Jul 2, 2019.

  1. jonsereds 621

    jonsereds 621 ArboristSite Member

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    I'm looking for a rim drive clutch sprocket and 8t rim for a Jonsered 2036 in 3/8 pico in the uk. I know it seems a little over the top for such a budget saw but I find it really handy for overgrown garden hedges, bushes etc. What I need is a part number, I can easily find similar for Husqvarna 136, but they use .325, and I find 3/8 lo pro to be a lot less "grabby".
    Does anyone use 3/8 low pro on a husqvarna 136 with a rim drive (?), as this should be the same.
    Any info gratefully received.
     
  2. Huskvarna hotellgäst

    Huskvarna hotellgäst ArboristSite Operative

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    Oregon rim sprocket kit 417126X is indeed the one for both Husq136 and Jons2040. It comes with a .325 x 7 rim (11892) . A .325 x 8 rim (11891) is available but Oregon do not make 3/8EP rims for any of the Powermate drum splines sizes.
     
  3. sawfun

    sawfun Addicted to ArboristSite

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    I run the drum setup n my Husky 36 instead of rim and have read that they work better. Mine came stock with 3/8. so found the biggest advantage when stock was to use non-safety chain like Oregon VXL. A couple of years back I had it ported and feel 3/8 is still the best chain for it.
     
  4. jonsereds 621

    jonsereds 621 ArboristSite Member

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    It seems that a rim drive for 3/8 low pro cannot be accommodated on this hub as radius (at 6t ) needs to be too small. However, after more digging I did manage to find an 8t 3/8 low pro in Greece - but plus plenty postage. For my job this would give no advantage, so I shall stay with sprocket on clutch drum. I try to fit a rim setup on my old saws as they all get used and I find that they seem to cut total vibration considerably , also a simple matter to go up a gear (from 7 to 8t 3/8" ) or swap to .325 etc. For jobs such as this one gets, the advantage for me is 3/8 low pro is easily available here ,some times very inexpensive, so when you hit an unseen bird box, tv cable, temporary unfused power supply to a shed which is no longer there or a simple angle iron bed post c/w wire it is not a disaster. Light and cheap is in this case = v good.
     
  5. sawfun

    sawfun Addicted to ArboristSite

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    Even ported, I don't think my 36 would do well with 325. I'd stay with a 7 tooth as I don't think the power is there for an 8 tooth. Maybe a ported 41 would be different as it is 5cc larger, I dunno.
     
  6. NSEric

    NSEric ArboristSite Operative

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    The Chinese 3/8 7 tooth rim sprocket works fine with 3/8 lp. I have run it on a couple of saws now.
    If you can get the clutch that takes a rim sprocket all you need is a 19mm id 7 tooth 3/8 rim sprocket. They're all over ebay for a couple bucks, you want the one for the 45-52cc Chinese saws, they take the same rim sprockets as small huskys.
    I know it's not a 8 but it's still better than a 6.
     
  7. jonsereds 621

    jonsereds 621 ArboristSite Member

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    Thats some good sound thinking, thanks for that. Its on it's way from Shenzen or whatever.
     
  8. Huskvarna hotellgäst

    Huskvarna hotellgäst ArboristSite Operative

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    3/8 extended pitch chain will work in a standard 3/8 rim in a similar way to which a small phillips head screwdriver will work in a large phillips-head screw. That way is, loosely. I suspect that the Chinese rim in question is not made to correct 3/8 spec.
     
  9. NSEric

    NSEric ArboristSite Operative

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    Im not sure why it works but it works fine, they sell saws that way, that's how I ended up with that set up.
    I checked both saws that have that set up for binding or any other issues that might be caused by the sprocket being a hair too small but cant find any. The chain rolls really easy by hand and doesn't vibrate or anything. Im running Oregon 3/8lp chain, other brands may be different.
     
  10. jonsereds 621

    jonsereds 621 ArboristSite Member

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    Just to be quite clear. The Oregon power mate drum is No :-41726x in the uk, it may well be different in Australia,.... but I'm in uk. Similar bushes and obstacles though, no doubt !
     
  11. Huskvarna hotellgäst

    Huskvarna hotellgäst ArboristSite Operative

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    Typing error, sorry. The number's the same worldwide.

    You could try one of these.
    https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com.au/ulk/itm/222744248117
    I bought a .325 X 7t kit for a Zenoah 3800 from this guy and it's been great.
     
  12. jonsereds 621

    jonsereds 621 ArboristSite Member

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    Thanks for the link. My problem is now that while the sprocket I have (Oregon as above) takes a rim in 3/8 (or .325) there does not seem to be a 3/8 x7 low pro rim available to suit. The Chinese seem to ignore the difference even from new, but the fact is a low profile rim really needs to be a bigger diameter than its 3/8 standard equivalent, other wise all drive is taken by one drive link at a time ,rather than 3 or four, which is (technically) very incorrect. (but in practise works)
    I do however have a Chinese spur type clutch with 3/8 low pro rim to suit for a Stihl 018 etc. However its 3/8 low pro rim (bigger dia ) does not fit my Oregon spur sprocket. BUT, would you believe, the 018 spur sprocket fits the 2036, bearing and all. the od of this clutch drum is however around 2mm bigger, so while clutch shoes have a little further to travel but seem ok, it would be necessary to doctor brake band to get clearance.
    I have sufficient experience to notice that the actual spur is bronze welded into both but if I swapped them over the heat I would need would undoubtably trouble the tempering of the surface for needle rollers........
    But maybe not ! Right now I don't have the inclination to be bothered, so it is running a 3/8 low profile chain on a 3/8x7 Chinese rim (with 19mm hole) as they handily advertise. (as suggested previously, it seems to be fine), so I shall feign ignorance. Fortunately, there are not likely to be any smart Alec's pointing out my error where it is currently at work, and if there were, they would be put to work regardless dragging blackthorn and sloe branches (with unusually aggressive thorns prone to staying just under skin till good and swollen) up a steep wet bank to where I can get to them with a tractor sweep.
    Good chain speed, light and cheap however, with room in handle for good gloves.
    For me it still begs the question, why no 3/8 low pro rim for this particular hub ?
     
  13. NSEric

    NSEric ArboristSite Operative

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    Im running the wrong 3/8 rim with 3/8lp on a strong 54cc saw, try it I think your smaller saw will be fine.
     
  14. Huskvarna hotellgäst

    Huskvarna hotellgäst ArboristSite Operative

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    In practice, a new chain is only making even contact with more than one ramp/spur of the rim/sprocket for the first few minutes of use. Once the chain stretches to any extent, there's a mismatch and so as the chain cutters sequentially feed themselves into and out of the cut, the load is being born by varying numbers of drive links, sometimes momentarily by just one. I suspect that when 3/8EP is running on a 3/8 rim, it's always one tooth rather than momentarily, in line with what you said.

    As we know, the benefit of the rim type is that despite the above, the wear on the clutch drum splines is relatively even, allowing the one drum to remain in service with a sequence of disposable rims and worn out chains. However, the lower the power of the saw and the less frequently the saw is used, the less this is an advantage.

    If Oregon considered it feasible and worthwhile, they would make a 3/8EP rim but I suspect that neither is the case.
    A 3/8EPx 6 rim could not be made to fit the small Oregon drum splines. A 3/8EPx7 rim would run the chain too fast for most saws equipped as standard with a 6 tooth spur sprocket.

    Because I had suitable bars and chains lying around, I've now got two 38cc saws that came with 3/8EPx6 now running .325x7 rims. I do have to make sure the chains aren't too aggressive.
    I'll be interested to see how you guys go.
     
  15. NSEric

    NSEric ArboristSite Operative

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    If Oregon made rim sprockets for 3/8 lp and sold kits to put it on 35-50 cc saws, they'd never sell any .325nk, they spent a lot of time and money making and advertising .325nk aka speedcut so they wont add another product in the market to compete against it.
     

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