Hydraulic chain saw question

Yeah, I tried to look it up online, but couldn't even find a website for Case. I ended up calling the local dealer. They looked up the flow no trouble but couldn't put a # on the psi. It must be at least 2000, I would think.

It was considered.

There have been some pretty impressive builds documented on the Forrestry Forum and Arborsite.com, with cutting motor size and chain lube. Dune, if you dicide to build it, please don't forget your camera. I've wanted to build one for years but the stacked pumps and advanced hydraulics scare me thinking of the pile of hyd. components (and money) that I'd have that were the wrong size/part. I'd like to share a six pack with MotoBoyMatt for some edumumcation in this area, the welding/fab work is the easy part!

I am building it. It is a job for a customer. I never mastered pictures, but maybe I could e-mail them to you.
Thanks for the tips about the other forums.

I found a motor. I can't google this, so if someone has time to check it out, it would be cool. Pesco Products, Cleveland Ohio. Looks aircraft.

New part# 1?349N
Old part# 349N
Type: Gear
order number: N288S13109

Has a 5/8 splined shaft and #8 (1/2") ports.

http://www.danzcoinc.com/html/basic_saw.html

Found this link. This company sells harvester saw motors and or saws all set up, plus a lot of other cool stuff.
Will contact them monday for price/availability/advice.

Meanwhile I am headed to the library to hopefully spec out the motor I found yesterday. I still have full google privelegdes at the library (for now).

This build sounds like it might be a little bigger than what you'd have limited to a SS aux hyd circuit but I hope it helps. http://www.forestryforum.com/board/index.php/topic,40190.0.html The guy is an insurance/computer type that does some real nice fab work. If you get a chance, he built a real nice band mill as well. Snoop around there.

What is the model number of the skidsteer? You may be able to find the specs you need here
http://www.colemanequip.com/CaseSkidSteerLoaders_HistoricalData.asp

Awesome. 21 gallons at 3000 psi. Splitting will not be an issue.
Thanks for the link.

Found some good links in that thread, thanks.

This system seems to work pretty well, it only operates one function at a time, you could do multiple functions at the same time from a single aux circuit but it would require some flow dividers.


Here are some quick numbers based on operating one function at a time.
Let me know if you want to try any other combinations, I made a quick spreadsheet and can plug the numbers in and paste the results.


Flow 19.1 GPM
Pressure 2000 PSI
Splitter Force 30 Tons
Splitter Stroke 20 Inches
Cylinder Diameter 6 Inches
Saw HP 20.1
RAM SPEED 2.5 Inches/sec
Time to split 8.2 Seconds

Here are the updated numbers for 3000 psi, drops the cylinder size down and ups the splitting speed.


Flow 19.1 GPM
Pressure 3000 PSI
Splitter Force 30 Tons
Splitter Stroke 20 Inches
Cylinder Diameter 5 Inches
Saw HP 30.1
RAM SPEED 3.7 Inches/sec
Time to split 5.4 Seconds

Thinking about this motor for saw, # 280-272, near the bottom of this page

http://baileynet.com/hydraulics/bailey_hydraulics_other_products/?productcategory=1000004

.58 c.i., 5000 rpm, about 12.55 gal/min, 2000 psi.
I suppose I should look for a higher pressure motor.


Have 6" splitter piston
have char lynn 2000 motor for feed roller.

Yeah, higher pressure will allow you to maximize HP (13.3 at 2k, ~20 at 3k). 12.55 GPM is the theoretical flow, realistically it will take 5-10% more flow due to internal leakage/inefficiencies.

Complete saw from this company http://www.danzcoinc.com/html/basic_saw.html
is pretty reasonable at $900 plus, considering what it is, but is not designed for use with quick disconnects.
This companies motor would work well for a stationary processor and the gentleman's comments about the overall costs of
running a skid steer attachment vs a small dedicated processor mean I now will likely recommend not using the skid steer.
The labor cost of the skid steer unit is lower, but the operating costs, including long term maintainnence seem to be much higher.

I really didn't want to get into building all the stuff that the skid steer mounted machine eliminates, such as an outfeed conveyor for the splits, a hydraulic power pack, hydraulic tank, operator position, a live bed for loading logs onto the feed conveyor, a feed conveyor, a frame, a trailer, etc. but I will not be helping the guy
if his operating costs are too high.

Thanks, that works.
I generaly use the rough but even simpler formula of 1 gal/min @1500 psi = 1hp

If we don't go with the skid steer set up, I asked the guy to try to find a standy reefer motor (diesel) from a reefer trailer, since he is connected to a trailer/storage outfit. We would then base the pump on what motor he finds.

My push for the skid steer attachment type was that it would be less fabricating work for me. If it was last fall, I would have time to build
a trailer mounted processor with all the bells and whistles. Business is pretty seasonal out here. Too much to do all summer, not enough to do all winter. If I do have to build the larger style, I need to do it in modular fashion, so that incrementaly, as it is built, his production increases and I can do the bulk of the work later in the year.

Thanks MBMatt, not to hijack from Dune but since we're on hyd's and your the only hyd engineer I sort of know, I have a skid steer with 40 gpm @ 3300 psi and would like to convert a 3pt. (tractor) snowblower of about 84". to fit the S.S. The tractor blowers are set up for 540 rpm pto. What displacement motor (hyd) should I use? My flow on the S.S. is adjustable, but I think the pres is tied to the eng rpm and that rating (3300) is prolly at the machines rated rated (engine) hp. of 115. I don't know if there is a choice, but you know, being from WC how much hp a snowblower can eat up! What is the most powerful pump my machine will power? Thanks

Start with the output horse power of the pto that used to run it. You have plenty of pressure but gallonage may be an issue.
Once you determine the horsepower required, a motor can be selected.