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Hydraulic hose pressure question

J

jfharper

Member
When you replace hyd. hoses, what pressure rating should you consider.? This would be the loader and also rear 3 pt rams. Most of my loader run 1/2" hose and the 3 pt has 1/4"

The hydrualics run off a front mount pump 1.95 CIR, max RPM is 2200, my engine horsepower is 42.
 
This brings up another question, what pressure front pump should I be running? And how can I determine what pressure front pump I currently have based on the CID calculations? (1.9776)
 
PSIG is Pounds per square inch gauge, or PSIA + barometric
pressure. PSI on pumps is normally measured as PSIG.

You will need to have a rating greater than 2300, probably 3000 or
more.
 
So a 1.9776 CIR pump should have a rating of 3000 PSI or more? What would happen if I put a 1.95 CID pump on rated at 2300 PSI?
 
The pressure rating is based on internal seal and component design, not Displacement, or RPM. The smaller the displacement per revolution, the less rapid the cylinders move. The greater, the faster.
Hose ratings in working pressure should be at least 50% more than regulated pressure. All systems should have a pressure regulator to prevent broken components and burst hoses/pipes. It should be set to the working rated pressure of the pump, or less.
My reasons for hose working pressure higher is that the load may shift, or the pressures when stopping a lowering load may exceed the pump pressure by quite a bit. Jim
 
The CID of the pump has nothing to do with the pressure rating. The pressure regulator/relief valve may not be in the pump but elsewhere in the system. As stated before, Regulated/relief pressure must be equal or lower than the pump's rated pressure. It would help to know what tractor this is on and if it is strictly for a loader or also for the tractor hydraulic system.
 
mf 205 industrial with a 200 loader and 2 rams for the 3 pt implement. I found a davis loader manual for the 99-101-102 with the same pump, they say pump should be over 2150 PSI
 
Just get 2 wire hose and you'll be fine. Hydraulic
hose is rated by working pressure and there is at
least a 1 1/2 times safety/burst rating built in.
 
Buy the double braided hydraulic hoses. If you want to view your pressure you need to install a pressure gauge. A 0-to 5000 psi gauge should handle your pressure. We have Colliflower Inc in our area. They can make a new hose while you wait. You need to take the old hoses along. Hal
 
Most hyd. hose is rated for 6x burst pressure. That means that if the system pressure is running at 2000 psi then the burst rating is 12000psi. It has been my experience that a hose will break due to area around the fitting flexing too much or the hose being hit or struck and causing damage.
 
Stay away from the one-wire hydraulic hose, to low of
pressure rating in 1/2" to deal with most equipment these
days. The choices in a 2-wire hoses are - R-16,R-2,and R-17.
All have a minimum rating of 3000psi. Most R-16 and R-2
have a 3500psi rating. Also the burst factor is usually 4-1.
 
Last I checked 1 wire is nearly impossible to find and nobody has the fittings for them. They all say that they can crimp down a 2 wire fitting to make it work but will make no guarantee. Most 2 wire 3/8" is rated 330 bar(4785psi)
 
Wile E said, "Most hyd. hose is rated for 6x burst pressure."

I'm sorry, but this is incorrect. Almost all hydraulic hose has a 4:1 ratio of minimum burst pressure to recommended maximum working pressure.

For example, 1/4" SAE 100R2AT two-wire hose has a minimum burst pressure of 20,000 PSI and a maximum working pressure of 5,000 PSI.

The one exception I know is hydraulic jack hose, which has 2:1 ratio (20,000 burst, 10,000 working). The reason this ratio is low is that jacking applications are very low flow and do not result in impulse surges like other hydraulic applications.

DiscountHydraulicHose.com
 
I would recommend a hose meeting SAE 100R2AT specifications. This is a good 2-wire hose with a sturdy cover that is ideal for tractors and other mobile hydraulic applications.

SAE 100R2AT specifications
1/4" ID --> 5,000 PSI max. working pressure
3/8" ID --> 4,000 PSI max. working pressure
1/2" ID --> 3,500 PSI max. working pressure
3/4" ID --> 2,250 PSI max. working pressure
1" ID --> 2,000 PSI max. working pressure

You could also use SAE 100R16 (same pressure as 100R2AT) or SAE 100R17 (3,000 PSI all sizes), but both have a thinner cover and typically cost more than SAE 100R2AT.

As another benefit, you can often find field-attachable (non-crimp) fittings for SAE 100R2AT, but you're less likely to find those available for the other hoses.

DiscountHydraulicHose.com
 
Thank you.

OK, so to figure out what I need, I take my pumps working pressure which is regulated at the valve at I think ~2200PSI, and that is my working pressure of the hoses...correct? Then need to factor in the burst rating in case I'm running the loader into a pile of material, or am bouncing on a stump or something which can significantly increase the pressure the hoses would need to withstand...do I have this correct so far?
 
I don't think you need to worry about burst pressure too much here. The reason for the 4:1 ratio is to accommodate an occasional spike in pressure and give you lots of safety cushion, so to speak.

If you use SAE 100R2AT as I mentioned before, the 1/2" size is rated for working pressure up to 3,500 PSI. The minimum burst pressure is four times that, or 14,000 PSI. I seriously doubt your system is going to see pressure spikes that high.

Smaller sizes, like 1/4" and 3/8" are rated even higher.

Because SAE 100R2AT is very common, it is also extremely economical. We sell 1/2" ID for only $1.64 per foot ( $1.56 when you order online at www.DiscountHydraulicHose.com ). Fittings and assembly are slightly more.
 
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