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Author Topic: Manual clutch  (Read 603 times)

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Offline charles mann

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Manual clutch
« on: September 16, 2023, 01:45:32 AM »
At about 1:50, a bell housing can be seen on the back of the detroit power plant. 


On another vid of their's, i saw him move a lever, loading the engine a little, then going to high idle for operations. 
I FB msgd the person and he said he thinks its a rockwell, would send me a pic of the data tag, but he has a business to run and it probably slipped his mind, which, again, he has a sawmill business to run, not a parts/engineering business. 

Can someone ID/confirm the type, maybe even model? I need to get back on my big mill build and 1 of the things is the drive belt system. I think instead of more failed attempts at bell cranks/levers and linkage, maybe its best to find a manual clutch similar, or exact to the unit mated to the detroit. 
My google search hasn't turned up anything that even comes close to the looks of the bell housing/clutch when searching rockwell, but a result does pop up for a rockford, but that is only clutch packs/disks and pressure plate, no bell housing or anything that would mate to the engine bell housing. 

If i could find the type of clutch and bell housing, it might help determine what size shaft i need, if i have to change from the shaft i already have. 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline DanielW

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Re: Manual clutch
« Reply #1 on: September 16, 2023, 06:20:58 AM »
It's a 'Rockford' PTO clutch, not a Rockwell. Not sure of the exact model, but it'll be one with the SAE bellhousing to match the Detroit. The Rockford were the most common type of industrial power unit clutches, but still sometimes hard to come by used as they're in demand. I have one on the Detroit of one of my mills. Some heavy equipment like skidder, graders, and combines used them. Definitely would be the easiest way to clutch your Detroit. That guy should have more belts on those sheaves: Even with those large diameters, three 5V belts will only transfer about 30 or 40 HP at those RPM's.

You see those clutches (and engines with those clutches) on Sawmill Exchange, Facebook Marketplace, Kijiji, etc., but they often get snapped up pretty quick. You can still buy them new, though I suspect they'd be pretty pricey. 

Offline charles mann

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Re: Manual clutch
« Reply #2 on: September 16, 2023, 06:45:39 AM »
@DanielW 
thanks for the info. Iv got a cummins 4bt, but looking around online now that i know what it is, and even another FF post regarding the pto clutch, yep, for the price of a new pto, i might as well go with an ogura electric clutch rated for 100hp. A few yrs ago, just before the plandemic, the ogura was $1900, and looking at the rockford, new, $1700 ish depending size and whatnots and in stock availability, i might go electric and be done. 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline booman

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Re: Manual clutch
« Reply #3 on: September 16, 2023, 09:36:08 AM »
I am curious as to what electric hoist you are using.  
2019 LT15G25WIDE, 2013 LT35HDG25, Stihl MS880 with 59" bar with Alaskan sawmill attachment.  John Deere 5045 tractor with forks, bucket and grapple.  Many chainsaws.

Offline charles mann

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Re: Manual clutch
« Reply #4 on: September 16, 2023, 09:55:40 AM »
I am curious as to what electric hoist you are using.  
i think you mean the hoist they use in the vid, correct? i would imagine its a 120v ac electric hoist, and it looks very similar to the hoist control we use to take our internal tank out and bring it in the acft. i think we got ours at HF. 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline booman

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Re: Manual clutch
« Reply #5 on: September 16, 2023, 10:09:23 AM »
Yes, thanks.
2019 LT15G25WIDE, 2013 LT35HDG25, Stihl MS880 with 59" bar with Alaskan sawmill attachment.  John Deere 5045 tractor with forks, bucket and grapple.  Many chainsaws.

Offline charles mann

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Re: Manual clutch
« Reply #6 on: September 16, 2023, 10:19:48 AM »
Yes, thanks.
Then to find out the winch style, youd have to comment on their videos and they should reply. But honestly, a google search for 120v ac winches, if you arent keen to buying HF stuff, should yield decent results. 
I know grainger sells them, but at a ridiculous price. May try msc direct as well. But im on yr 4 with my newest 12k badlands hf winch and its constantly exposed to elements and only reason i bought this second one, was operator error/tiredness and decided to run it in reverse and burned out the holding clutch. 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline mudfarmer

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Re: Manual clutch
« Reply #7 on: September 16, 2023, 11:53:36 AM »
I think these are also called an "over center clutch" if that helps with searching? Possibly also used on big honking wood chippers. Some of those maybe ran 4bt as well.

Offline moodnacreek

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Re: Manual clutch
« Reply #8 on: September 16, 2023, 01:44:29 PM »
On those clutches you first need to know the size, the s.a.e. number tells the basic size. The engine must have a sae flywheel and a sae bolt pattern [that will be a full circle].  All industrial engines should have sae bolt patterns and some others need an adapter. Big truck engines will have it but the flywheel will not be sae.

Offline charles mann

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Re: Manual clutch
« Reply #9 on: September 16, 2023, 08:11:09 PM »
Both flywheel amd eng bell housing are sae. I measured it early early this yr to mate a 60Hz gen head on it, instead of the 400Hz that was attached to it. 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline charles mann

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Re: Manual clutch
« Reply #10 on: September 17, 2023, 12:31:09 AM »
I am curious as to what electric hoist you are using.  
here ya go, they posted a vid of the log turning winch.
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot

Offline booman

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Re: Manual clutch
« Reply #11 on: September 18, 2023, 07:31:09 AM »
Thank you very much for the info on the winch.   Looks very useful.
2019 LT15G25WIDE, 2013 LT35HDG25, Stihl MS880 with 59" bar with Alaskan sawmill attachment.  John Deere 5045 tractor with forks, bucket and grapple.  Many chainsaws.

Offline DanielW

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Re: Manual clutch
« Reply #12 on: September 18, 2023, 09:45:52 AM »
If you go with an electric clutch, are you considering putting sheaves right on the crank output of the 4BT? I've seen a few circular mills where people have belted right to the crank of an old engine. It works, and for a few hours a week you'd probably be fine, but when people to that they're putting a pile of side-load into the rear main bearing, which wasn't really designed to take any. Better to couple it through some u-joints to a jackshaft with its own separate bearings.

Offline charles mann

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Re: Manual clutch
« Reply #13 on: September 18, 2023, 07:58:16 PM »
If you go with an electric clutch, are you considering putting sheaves right on the crank output of the 4BT? I've seen a few circular mills where people have belted right to the crank of an old engine. It works, and for a few hours a week you'd probably be fine, but when people to that they're putting a pile of side-load into the rear main bearing, which wasn't really designed to take any. Better to couple it through some u-joints to a jackshaft with its own separate bearings.
Iv got a pillar block bearing between the flywheel and belt sheave mounted at a 45 angle to limit side and downward load. 
Temple, Tx
Fire Fighting and Heavy Lift Helicopter Mech
Helicopter and Fixed Wing Pilot


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