Chainsaw Repair

Chain - Grinders - Filing - Wood Milling - Tools - Welding - Machinist - Mowers - Tillers => Chain - Bars - Grinders - Filing => Topic started by: Cut4fun on February 28, 2011, 04:25:06 pm

Title: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun on February 28, 2011, 04:25:06 pm
This is what the chain makers are looking for to make up those special race chains. Can you guys tell the difference in the cutter difference from the new Oregon 72 LG.

 2 different older LG cutters shown below.

The 76 LG is used just for it's lighter chassis drive links and tie straps.



Nice Oberg copied 6 sided bevel file.



Title: Re: Oregon 72LG and 76LG
Post by: Cut4fun on February 28, 2011, 04:31:06 pm
Oregon 76 SL can also be used for it's lighter chassis drive links etc.

76SL

Title: Re: Oregon 72LG and 76LG
Post by: mdavlee on March 02, 2011, 05:08:51 pm
I've never seen or used any of the 76. It does look like it would be a little lighter.
Title: Re: Oregon 72LG and 76LG
Post by: HolmenTree on March 10, 2011, 11:04:21 am
I've never seen or used any of the 76. It does look like it would be a little lighter.
Nice little pulpwood chain with a very smooth narrow kerf chisel cutting action. Sized between a .325 and a full sized 3/8 chain. First introduced in 1982 and discontinued in the mid 1990s. Too bad we no longer can get it because for the professional cutter that size chain on the 50-60cc saws was real nice to have , a little bigger then the .325 for extra filing life but not as power robbing as the big 3/8. Less chain derailing on the safety nose bars too which alot of forestry outfits were forced to use to cut down on kickback injuries.
Stihl had the same style of chain called the 33-34TS [ Topic Super .050-.058].
 Racers would put a full size chisel 3/8" cutter on the smaller chassis enabling better chip clearance and flow, plus lightness with no need to grind down the shot peened surface as done on the full sized chassis.

Willard.
Title: Re: Oregon 72LG and 76LG
Post by: Cut4fun . on August 16, 2012, 05:35:51 pm
Oregon 76LG  3/8 050

Title: Re: Oregon 72LG and 76LG
Post by: Al Smith on August 17, 2012, 11:12:02 am
I've got a couple loops some place hanging on a nail .Where it came from I haven't a clue but suspect perhaps on an old McCulloch I acquired some place .

Now the neat thing about that is the driver length count for both Mac 16" and Stihl are exactly the same which very seldom happens .They're usually off by a few drivers one way or the other to interchange .

A 16" other than .325 is something I seldom use although I've got plenty of loops for same mostly from Macs .About the only time being if I attempt to be a racer over the cants which hasn't been a success story but fun never the less .Since I managed to get a few Stihl mount 16"s I'll probabley delve into filing some faster chains .Perhaps saving those few loops of #76 chain for same .
Title: Re: Oregon 72LG and 76LG
Post by: Cut4fun . on August 18, 2012, 01:58:54 pm
Just sharing the old boxes with the info on the back of the Oregon 76LG chains. Looks like between the 2 pics of backs you can read everything.

Title: Re: Oregon 72LG and 76LG
Post by: HolmenTree on October 31, 2012, 10:55:24 am
Kevin I'm confused about the 76-77LP marked on the box when it should  be 76-77LG. I can't remember this chain ever being called LP. I do remember a few months ago a women from Oregon sawchain posted on A.S. saying the 76-77LP was discontinued in 1980.
I think she has bad information because I never heard of 76-77 LP  chain being discontinued in 1980.
I field tested 73LG and 77LG chain on my Jonsered in 1980-81 for Oregon which was then introduced in 1982. I have proof here from a July 1982 Chainsaw Age magazine ad. The bottom left hand corner of my pic here shows the date and the introduction of the 76LG. Notice they also called it low profile .   
Title: Re: Oregon 72LG and 76LG
Post by: Cut4fun . on October 31, 2012, 01:19:30 pm
I had some super guard 76 they called LP in pics above too.

 The end of those boxes were marked 76LG if you look at end.


Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on February 10, 2013, 08:25:39 pm
I've never seen or used any of the 76. It does look like it would be a little lighter.
Nice little pulpwood chain with a very smooth narrow kerf chisel cutting action. Sized between a .325 and a full sized 3/8 chain. First introduced in 1982 and discontinued in the mid 1990s. Too bad we no longer can get it because for the professional cutter that size chain on the 50-60cc saws was real nice to have , a little bigger then the .325 for extra filing life but not as power robbing as the big 3/8. Less chain derailing on the safety nose bars too which alot of forestry outfits were forced to use to cut down on kickback injuries.
Stihl had the same style of chain called the 33-34TS [ Topic Super .050-.058].
 Racers would put a full size chisel 3/8" cutter on the smaller chassis enabling better chip clearance and flow, plus lightness with no need to grind down the shot peened surface as done on the full sized chassis.

Willard.
on of the 76LG. Notice they also called it low profile .   

I just picked up 2 NOS 72dl loops of the stihl 33TS  33 Topic Super  you talked about.  Going to try them on the woods ported 45cc 346  and the stock 550xp
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on February 15, 2013, 06:03:21 pm
Got my 2 loops today.  So which file to use on these?  3/16 4.8mm or find 5mm  or 13/64 5.2mm

Just saving info.

Quote from: HolmenTree;1269883
Oregon and Stihl made a 3/8 full chisel low profile chain which was poplar in the pulpcutting industry 20 plus years ago-Stihl 33 TS [Topic super] and Oregon's  76 and 77 LG. These 3/8 chains were equivalent in size between a .325 and full blown 3/8. Good smooth cutting chains and the beauty about them was you could put a full size 33RS or 72LP cutter on their smaller chassis. One of the modding tricks done in  timbersports.

As I posted a while back, when I was tech services manager for Stihl in 1989 the Stihl Swiss chain factory sent me a roll of test chain to test in northern Alberta. It was the 33 Topic Super with 33RS cutters on it, I quit working for Stihl shortly after so I never had the opportunity to see how the test panned out. I just know that chain cut like crazy.At the time all the serious timbersport saw competitors were building their chain like this so it was nothing new, Stihl just wanted to test it out in all day conditions. As a matter of fact those 33RS cutters in 1989 were the prototype of the sloped depth gauge cutters that we know today.[Oregon introduced that design originally as the LG in 1982] 33RS at the time had the straight up/down depth gauge like the Oregon 72LP,Oregon LP had the anti kickback humped drivelink and the older Stihl 33RS had theirs on top of the tie-strap directly in front of the cutters depth gauge. Now the new 33RSC3 has both of both worlds, drive link and sloped depth gauge anti kickback ramps.



Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on February 16, 2013, 02:12:50 pm
Tried to get some good pics.   :-[ 

Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on February 17, 2013, 02:19:58 pm
Got my 2 loops today.  So which file to use on these?  3/16 4.8mm or find 5mm  or 13/64 5.2mm
Nice find!
 It would be nice if Stihl would re-introduce this sawchain. The Stihl factory recommended file size for the Topic Super 3/8 chain was 11/64" [4.5mm], but good luck finding that file size. Go with a common 3/16" file which is what Oregon 76LG spec calls for. I myself and other loggers in our area used 5mm files for these two chains, 13/64 is too big.
Us loggers had a habit of breaking smaller diameter files with our hand strength ha ha, so the suppliers gave us 5mm. Full size 3/8 we used 7/32 and 13/64.
 
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Old Iron Logging on February 17, 2013, 06:04:20 pm
 4.5 files are a regular stock item for Stihl. We have plenty on the shelf. Need some? $18.00 per dozen.
That is what we use here instead of a 3/16 when a 21 lpx gets 1/2 worn.

Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on February 17, 2013, 06:30:48 pm
4.5 files are a regular stock item for Stihl. We have plenty on the shelf. Need some? $18.00 per dozen.
That is what we use here instead of a 3/16 when a 21 lpx gets 1/2 worn.


Thanks for the info Old Iron, it's good to see items like this still available. Now if only Stihl could bring back the Topic Super chain.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on February 17, 2013, 07:36:58 pm
This is what save edge sells in round files.

6” x 1/8”     3.2 mm    637-3011      
8” x 5/32”    4.0 mm      637-3021      
8” x 11/64”    4.5 mm    637-3041      
8” x 3/16”    4.8 mm    637-3031      
8” x 13/64”    5.2 mm    637-3051      
8” x 7/32”    5.5 mm    637-3061      
8” x 1/4”     6.3 mm    637-3071      
8” x 5/16”    8.0 mm    733-0717 
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Old Iron Logging on February 18, 2013, 07:29:51 pm
I have a nos Oregon 77 here somewhere. 59dl.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on September 19, 2013, 05:54:29 pm
I took a bunch of chain loops in on trade on a saw and I found a loop of the old oregon 72lg that the racers like for their cutters.

 I'll show a pic here so you can see the difference and why the chain makers like the older cutters.  Look closely now if you dont already know why.  ;)

I'll trade or sale this 72lg 60dl chain if anyone is interested. I hate to throw it on and use it up as a work chain if someone out there would rather make a race chain out of it.

Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on September 21, 2013, 04:37:23 pm
JFYI the old 72LG in pic above is spoke for.   ;)  Can you say future racechain.    8)
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on September 21, 2013, 11:12:21 pm
I took a bunch of chain loops in on trade on a saw and I found a loop of the old oregon 72lg that the racers like for their cutters.

 I'll show a pic here so you can see the difference and why the chain makers like the older cutters.  Look closely now if you dont already know why.  ;)
Just to explain for those not in the know of the differences between the old LG and new stuff. First you will notice the small one barbed arrow between the rivets on the modern chain, that's the Anti-Vibe symbol for all the new Oregon chain [as of starting approx. 8-10 yrs ago ] Look close at the differences between the anti vibe cutter and the older non Anti-Vibe cutter and you will see the Anti-Vibe cutter has less material under the rear rivet [heel of the cutter] then under the front rivet [toe]. The old LG cutter has equal material under both the heel and toe.
The newer cutter is modified to tilt the cutter back a little to cut down on vibration but doesn't attack or "porpoise" the wood in the kerf as well as the old style cutter did. Also notice the ridge along the top of the side plate on the old cutter, that ridge cuts down on friction to an extent and in some of the old LG chain a sharper working corner on the cutting edge.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: oldtimber on September 28, 2013, 11:18:00 pm
Willard, you are an encyclopedia sir. I've learned much from your posts, both here and on the Tree House forum. Thanks for sharing it all.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on September 30, 2013, 10:02:10 am
Willard, you are an encyclopedia sir. I've learned much from your posts, both here and on the Tree House forum. Thanks for sharing it all.
Thanks oldtimer, I'm still learning about sawchain ha ha.
It was just a couple of years ago that I learned chisel sawchain has been around for over 60 years, for some reason I always had it in my head that chisel was introduced in the 1960s.
Myself being interested in timbersport competitions I always have a fascination to make that chain cut faster, just like the auto industry they can't have proper research and development without auto sport competition.
I remember reading of one veteran of chainsaw racing Sven Johnson . With his wealth of knowledge he worked alongside Ray Carlton's sawchain company, doing some research and development for them.
I myself don't have near the knowledge Sven has or experience in timbersports, I have always lived in one of the most isolated parts of North America, travelling to top competitions was just too expensive and time consuming. Plus we didn't have the internet back then either :D

Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Eccentric on February 16, 2015, 03:09:35 pm
Thanks for bumping this up Kevin.  I had subscribed to this thread ages ago..............................but had since forgotten it.  Had forgotten about the Stihl version.  Now I have more to search for on ebay.  There's a lot of 76SL on ebay (good for the racers since they're breaking down the chain...........not for me) and a bit of 76LG (and the McCulloch version).  I intend to gather some more up for my 40-50cc saws.

Can regular Oregon 72 presets/tie straps be used to join 76LG loops (as stated by some ebay sellers in their 72 preset/tie strap listings), or do I need to scare up 76 presets/tie straps?
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on February 16, 2015, 03:36:09 pm
Never tried it. No clue. Bet he knows.   @HolmenTree
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on February 16, 2015, 07:00:38 pm
Hi guys when I used to work with 76LG chain I always had a good supply of presets, so can't say for sure.
If you were to do it you'd definitely have to grind a little off to match but can't say for sure if the .058 rivet flange of the 72 will fit the 76 drive link.
Can only take one apart and experiment.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on February 16, 2015, 08:22:51 pm
It's been 25 yrs since I last made a race chain but I remember spinning and making my own presets.
Before making Oregon 72/76 race chain I was building Windsor 3/8 AT chisel bit chain with pieces I bought through my saw dealer.
I could buy bags of rivets in both .058 and .063 flange and bags of side links. I'd break a chain down for the cutters and drive links , then dog bone etc and build from there.
I think Oregon sold all the chain parts too and may still do...........
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Hoggwood on February 16, 2015, 08:59:33 pm
@Hoggwood   @Eccentric

Great info here.  I see some Mac 370PG is the same 76LG on eBay.  The (affordable) search begins.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on February 16, 2015, 09:47:12 pm
My  brother who is a saw collector bought out an old saw dealers inventory of chain and parts, stuff going back over 50 years. He got boxes of links, cutters and other parts plus rolls of chain for a couple hundred bucks.
Never know what you may run into before it gets thrown into the landfill site to be gone forever.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on February 16, 2015, 09:56:22 pm
@Hoggwood   @Eccentric

Great info here.  I see some Mac 370PG is the same 76LG on eBay.  The (affordable) search begins.
I just looked at that Mac 370 chain it's not a match to the 76LG. It's 3/8 LoPro equal to the Stihl Picco or Oregon 91 series.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Hoggwood on February 17, 2015, 02:19:41 am
@Hoggwood   @Eccentric

Great info here.  I see some Mac 370PG is the same 76LG on eBay.  The (affordable) search begins.
I just looked at that Mac 370 chain it's not a match to the 76LG. It's 3/8 LoPro equal to the Stihl Picco or Oregon 91 series.

Thanks for taking the time to look at that.  I am certainly in the dark with respect to this likeable chain.

Cory
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on February 17, 2015, 12:50:17 pm
@Hoggwood   @Eccentric

Great info here.  I see some Mac 370PG is the same 76LG on eBay.  The (affordable) search begins.
I just looked at that Mac 370 chain it's not a match to the 76LG. It's 3/8 LoPro equal to the Stihl Picco or Oregon 91 series.

You looking at same chain as me?  Mcculloch 370PG looks just like oregon 76lg in these pics. http://www.ebay.com/itm/McCulloch-370PG-Pro-Guard-3-8-Pitch-050-Chisel-Chainsaw-Chain-Oregon-76LG-76E-/221670755289?pt=LH_DefaultDomain_0&hash=item339c9b4bd9
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on February 17, 2015, 01:18:10 pm
That's better.
Interesting......... Rebadged 76LG to Mac 370PG. I should have typed in the PG.
 370 shows 91 series style.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Hoggwood on February 17, 2015, 04:10:30 pm
That is the one I saw.  My confidence was wavering.

But, it looks very much like the current style I am running.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on February 17, 2015, 04:10:54 pm
Was trying to save that mac 370PG - 76LG pic. Good price too. Just under .30 dl shipped per loop.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on May 31, 2015, 11:56:07 am
@Philbert  you must have missed this thread ;) .  I was the one sending the 76 and 33 up to Holmentree.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on November 30, 2017, 10:50:50 am
@concretegrazer

Here is a few pics I found.

Old LG 72  x2 different ones.
Old  LG 76
Olberg copy


Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: HolmenTree on November 30, 2017, 12:05:55 pm
When installing 72 -75 LP/LG cutters on a 76LG chassis you can reuse the 76 presets with no problems.
Remove the 76 cutters on your chain breaker with the punch exactly dead center on the rivet. Alternate back and forth on both rivets pressing half ways to avoid bending both the preset side link and rivet.
When spinning the full size cutter onto the 76 preset use the smallest anvils (.250) on your spinner. Makes a nice clean smaller round rivet head that doesn't need reducing.
You'll need a 7/32" or smaller 1/4" socket and small hammer to get the cutters onto the presets.
Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: chainsawlady on November 30, 2017, 11:55:37 pm
@concretegrazer

Here is a few pics I found.

Old LG 72  x2 different ones.
Old  LG 76
Olberg copy


I have several feet of 73LG - 3/8 - .058 Oregon chain is someone is interested.
chainsawlady
Title: Re: Oregon 72 older stuff
Post by: Cut4fun . on September 22, 2022, 04:24:54 pm
Just saving some pics of old oregon 72 I picked up.

11lbs worth



Title: Re: Oregon 72LG 76LG Stihl 33TS
Post by: Cut4fun . on April 04, 2023, 10:51:05 am
Had some more oregon 76LG in.