[motocross77]

I have a case 446 that I would like to raise the hydraulic pressure on. Since I added a new bigger cylinder over the stock one, I was wondering if it is possible to raise the pressure to make lift hydraulics more powerful. Let me know! Thanks


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[RestMyCase]

Could you be more specific on the larger cylinder and where it is being used ? If you are referring to the OEM mid-lift circuit, the relief is set at about 575 psig. This relief pressure setting can be increased but be aware that damage may result to the bell crank parts because they were not designed to withstand higher forces and more pressure wasn't needed to operate any attachments to be lifted. If you are using the lift circuit to operate another cylinder elsewhere then I think you could increase that setting within reason ....

:fing32:

 

[TUDOR]

A larger diameter cylinder will lift more with the same pressure, but it will be slower if it is the same length or longer.

More info on sizes and what you are doing with it can result on more definitive answers.

 

[bhildret]

For sure, more info on the application is in order.

That mere 575 psi lift relief is capable of a lot of force on a 2" or 3" cylinder and raising the pressure could be more than you bargained for.

Of particular concern would be the mid lift cylinder itself, which has a comparatively light weight (but well fit for purpose) bottom end. Over the years, we've seen a number of them ripped out here on this forum.

Brian

 

[motocross77]

Thanks for the reply guys. The cylinder's shaft is 1 1/4" and the stroke is 12 inches long. I am using it on my new attachment I made that I can switch from a plow to forks to anything by two pins. I was thinking if raising the pressure would help it move a little faster and also make it able to lift more. Here is a picture.

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[antiqueetc]

Raising the pressure will have little effect on speed. Speed comes from volume, not pressure. I think the main speed constraint here will be the size of the lines, fittings and passages in the tractor's lift valve. Running the engine at max governed speed will get you the fastest cycle time.

 

[motocross77]

Speed isn't really as much as a concern. It moves up and down fine, but there's room for improvement. I can live with the speed if need be. I am mainly trying to get more lifting power from the cylinder when I am using my forks. It just seems like it should be able to lift more than it is now.


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[TUDOR]

Move the cylinder base to the bottom of that post and lift by extending the rod . That will give you 25% more lifting power (2800 instead of 2100 lb).

Then you factor in the leverage that it is working against.

You are in territory which can possibly do some damage to your lifting device and tractor now. Any improvements to lift capability are also adding to that risk.

Yes, I do know that Case makes a very strong tractor, but with a lifting capability of almost a ton and a half ahead of the front axle, the loads on front end components, including tires, get very large.

 

[motocross77]

What do you mean by move the cylinder base down to get 25% more power? Also here is better pictures of my set up.


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[motocross77]

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[antiqueetc]

Thanks for the reply guys. I was thinking if raising the pressure would help it move a little faster and also make it able to lift more. Here is a picture. View attachment 418033


My response about speed was in response to the above quote.

As Tudor stated, turn your cylinder over to increase lift power. You are using the piston area less the rod area x PSI to lift now. Flipping it over will give you the piston area x PSI.

But, as also mentioned, you are really loading the wheels/axle and frame !

 

[RestMyCase]

The explanation to flip the cylinder around for more lift power was great and makes good sense. My question now would be, will that make it operate slower ?

:dunno:

 

[bhildret]

The explanation to flip the cylinder around for more lift power was great and makes good sense. My question now would be, will that make it operate slower ?

:dunno:

Might or might not cycle more slowly. Either way you are displacing the same cylinder side volume into the cylinder or back through the tractor system.

Line sizing can make a huge difference and 3/8" lines might move that cylinder rather quickly. The 2" cylinder I use on the utility blade angling will cycle 6" stroke in about 2-4 seconds ... touchy with warm fluid and 1/4" lines.


I echo the 'you are pushing it' theme with asking for more front end fork lift. Flip that cylinder and it is more like 2.5" or 3" by the look of things.

If 3", that's almost 4000 lbs. of lifting force at the cylinder base with the existing 575 PSI.

I can just barely, safely lift 700-800 lbs with my 7020, very well weighted, and it was designed for this purpose, with proper load transfer to a much heavier frame.

Brian

 

[motocross77]

Thanks for the replies guys! I was able to get the cylinder flipped around. When I first did the test run it was taking like 2 minutes to fully extend. I could not find the problem anywhere until I looked underneath and seen that the 1/4" line coming off the tcv was kinked. Straightened the line out and it was working great again. It doesn't move any slower actually it might move a tiny bit faster than it used to. I was able to test what it can lift and I lifted the rear end of my golf cart off the ground which was impressive. Before it would only take the weight off the wheels but wouldn't get the tires off the ground. I am not hauling anything that heavy because then obviously I wouldn't be able to turn. I just wanted to have the power there if I need it. I might replace all the 1/4" lines to 3/8" to help it move a little faster some day but for now I'm happy. As I was doing the test I realized how stupidly placed the muffler is. Why would they have the muffler dump out in front of the tractor where it just comes back into your face and makes you smell for the rest of the day! lol Has anyone ever done anything about this? I was thinking of running it out the back some how.


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[TUDOR]

Most mufflers dump forward and down to keep the exhaust and the heat away from the operator. Most older single cylinder tractors dumped the exhaust out to the side.

Running pipes out the back sorta uses up space underneath and adds heat to the transmission, among other things.

Depending on the flow rate of the fluid, increasing the size of the lines may be money spent for little, if any, return. It won't make any difference on how much it will lift.

 

[motocross77]

Also to add to this instead of starting a new thread. I am doing a little overhaul to the motor and seals before winter hits. I took the cylinder heads off and saw this. Is this normal? Both sides are the same.

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[bhildret]

Yep ... pretty normal. Just needs a good decarbon job, as do all these older L head engines.

Brian