3x20 300CX hydraulic operating pressure

[Nitro-Fish]

Well it's that time of year again, just replenished the stock of wood pellets for the season (unloaded with the 3320 of course) as I've mentioned before the 3320 will move them, but not quite with authority. I am wondering what the suggested operating pressures are for the 3x20/300CX loader set-up. I shimmed the relief valve on my 790 & it helped a great deal, if I can do something similar on the 3320, I believe I will then be able to handle the pallets of pellets a bit easier. I checked the pressure and presently it is set to start by-passing at 2400 PSI; I assume this is the lower end of the operating range. I've read that it is a matter of adjusting the pressure relief on the 3320's & not a matter of shimming as on the 790, however, I am trying to find out if anyone has bumped the pressure up on the 3x20's & what they have been increased to.

 

[kennyd]

According to the spec sheet online: Product Specification for 3320 Compact Tractor (32.5 hp) the operating pressure is 2500PSI. Not sure what the "window" is, but it should be in the service manual. If you don't have one, I am sure somebody will check theirs for you.

 

[kjung17]

Before you bump your system pressure, I would recommend additional rear ballast.

 

[Cocre]

No "window" is stated in the service manual, just 2500 psi. I have considered bumping mine up, but first I want to take my guage to work and see how accurate it is. Mostly I want to bump it up because more is always better, right?

And as kjung says, add ballast.

 

[radman1]

I increased my JD 3520 and JD 4520 both to 2800 psi. Been that way for about 3 years. No issues. It is noticeable on the FEL capacity. My starting psi was 2450 for both.

 

[AKfish]

Hmm... if my math is correct - that's a 14% increase in operating pressure.

And everybody "seals" OK with that?

I'd like to bump my 110 up a bit, too.

AKfish

 

[Nuru]

There is a thread on this very topic floating around on the forum.

http://www.tractorbynet.com/forums/hydraulics/180405-hydraulics-limitations.html

 

[kjung17]

Hmm... if my math is correct - that's a 14% increase in operating pressure.

And everybody "seals" OK with that?

I'd like to bump my 110 up a bit, too.

AKfish

Oh, I just figured everybody knew these pressure tweaks would accelerate wear and promote failure. I wonder if they set their water heaters to 200 degrees? ;-)

 

[radman1]

Oh, I just figured everybody knew these pressure tweaks would accelerate wear and promote failure. I wonder if they set their water heaters to 200 degrees? ;-)

Need to remember, the amount of time the pressure is reaching the maximum is actually quite rare in most circumstances. Most lifts with FEL or 3 pt are way below max capacity. My FEL maybe lifting an extra 250-300 lbs at the increased psi. Cylinders are usually designed to tolerate pressure much more than the mild bump we are giving the overall psi increase. I wouldn't be surprised if cylinders are rated for 3000 psi. Theoretically, there is probably increased wear in the pump but in practical use it is a nonissue. Should we all decrease the psi to decrease the wear?

Lots of prior skid steers were 3000 psi. Now many are 3300 psi and still use the same attachments, cylinders and hydraulic motors. My old attachments still work as before. I use some skid steer attachments on my compact wheel loader and that psi is 3600. No issues-yet!

 

[kjung17]

Need to remember, the amount of time the pressure is reaching the maximum is actually quite rare in most circumstances. Most lifts with FEL or 3 pt are way below max capacity. My FEL maybe lifting an extra 250-300 lbs at the increased psi. Cylinders are usually designed to tolerate pressure much more than the mild bump we are giving the overall psi increase. I wouldn't be surprised if cylinders are rated for 3000 psi. Theoretically, there is probably increased wear in the pump but in practical use it is a nonissue. Should we all decrease the psi to decrease the wear?

Lots of prior skid steers were 3000 psi. Now many are 3300 psi and still use the same attachments, cylinders and hydraulic motors. My old attachments still work as before. I use some skid steer attachments on my compact wheel loader and that psi is 3600. No issues-yet!

I never mentioned decreasing pressure. On the other hand, why accelerate the wear by adding pressure that is not really NEEDED. 5% sure. 14% is too much. I see more evidence of side loading on cylinders used on "bumped" systems. Also, you are talking about different class of equipment. These fellas are bumping a little compact. They aren't built as heavy. I always set systems to the high end of spec.