Tigercat yarder

[Mike L]

I know nothing about yarders but it seems like tigercat hit the nail on the head. What say you yarder experts?

 

[John C.]

I have to wonder about no guylines. Too many engineers like to get the most logs possible per pull.

 

[1466IH]

I have to wonder about no guylines. Too many engineers like to get the most logs possible per pull.

I know nothing about yarders either but couldn't they limit that with grapple size?

 

[John C.]

They have a small grapple in that video, probably because of no guy lines. Loggers always want to push the envelope though.

 

[Tones]

But a faster set-up time has to be a plus.

 

[AndrewM]

No way Tigercat has done this on their own:

 

[Hallback]

I have to wonder about no guylines. Too many engineers like to get the most logs possible per pull.

Ya, seems to work well.

 

[Hallback]

$2M once rigged with lines & a carriage.
I just don't see how that pays vs a $50k air friction 071 with 4 guylines.
I've never seen hydraulic winches last over 5000 hours either.

 

[Hallback]

Don't get me wrong, I'd love to have one but it's no replacement for a real yarder.

 

[Mike L]

Well that answers that! My next question- I know an 071 is a madill yarder but what is air friction?

 

[Hallback]

Well that answers that! My next question- I know an 071 is a madill yarder but what is air friction?

Air actuated frictions vs hydraulic drive

 

[1466IH]

Well that answers that! My next question- I know an 071 is a madill yarder but what is air friction?

Frictions are basically I bic clutch that is air operated so there is usually a mechanical connection to the engine. Hydraulics are the same as a hoist line on your service truck crane. Frictions you can release clutch and brake at same time and they will free spool. At least that is how the cranes I have been around are set up.

 

[donkey doctor]

Slowhttps://www.rowlandcompany.com/wp-content/uploads/2018/07/Wichita-Standard-Vent-Clutch-Service-Manual.pdf Hope this works! Never tried it before.d.d.

 

[Mike L]

Frictions are basically I bic clutch that is air operated so there is usually a mechanical connection to the engine. Hydraulics are the same as a hoist line on your service truck crane. Frictions you can release clutch and brake at same time and they will free spool. At least that is how the cranes I have been around are set up.

I'm vaguely familiar with crane frictions I just didn’t realize they were air operated on a yarder. I’ve never seen one in person before. We don’t have ground out here that warrants the use of one.

 

[1466IH]

I'm vaguely familiar with crane frictions I just didn’t realize they were air operated on a yarder. I’ve never seen one in person before. We don’t have ground out here that warrants the use of one.

We don't either but I have been around several cranes and rig barges

 

[John C.]

Crane frictions are made to slip and have feel. Yarder frictions are either released or engaged.

 

[Hallback]

Crane frictions are made to slip and have feel. Yarder frictions are either released or engaged.

I respectfully disagree.

We slip yarder frictions often.
Example- lowering a turn or carriage we "back em down" thru the frictions.

 

[John C.]

I didn't know that you could do that. I stand corrected.

 

[Hallback]

I didn't know that you could do that. I stand corrected.

We do that because just relying on brake alone is too violent so what we do is we will throw the yarder up into 3rd gear (or just use torque converter if no trans) or so and let the weight of it come down through the frictions effectively slipping them as the load is lowered

 

[donkey doctor]

How do you do that without graduated air to the clutch. I would have thought the WC brake would be used. Not disagreeing just want to learn. Thanks d.d.