Hydraulic Suction Line

[ch47dpilot]

I have 2 questions about the suction line in a hydraulic system. The first I have a good idea but would like some opinions on. What size do you need to run. I'll be at about 8GPM and will be about 5-6 feet from reservoir to pump(only place I can mount both but would like it closer). The pump I'm looking at is: Surplus Center - 1.07 CU IN FENNER 2S25AAC HYD PUMP. It has a 3/4 inlet port. I'm thinking about 1" line just to help reduce any friction, is this about right? The surplushydraulic calculator( Surplus Center - Tech Help ) says 1.5" but will it make sense to run a hose twice as big as the pump inlet? The second question is about the type of hose. Is a normal pressure line strong enough to not collapse on the suction line or do the make specific reinforced lines for the suction side? If so any good sources

 

[N8ghz]

Surplus Center has specific suction hose by the foot.

That pump says it's SAE-12 on the inlet. Looking at SAE hose-barb adapters show SAE-12 to 1" hose as the largest for SAE-12.

I'd go with that.

 

[RickB]

I agree with 1" hose for your appication. There are dedicated pressure, suction, and return hose designs. 1" suction hose will meet your needs.

 

[LD1]

Agreed with the above, but I have to ask what you are building

 

[Discount Hydraulic Hose]

I can't see any benefit to using 1-1/2" hose with a 3/4" inlet. You may see some benefit increasing the hose to 1", but anything larger than that is not only a waste, but will force you to use extra adapters to deal with the drastic size change.

The only hose I would recommend for this application is SAE 100R4 Suction and Return Hose.

 

[ch47dpilot]

First thanks for the info and link. The project I'm working on is putting a hydrauic pump onto an old(1999) cushman with a 27HP 3 cyl. It has a small pump to run the dump bed lift cylinder but I am wanting something with a little more PSI and GPM to run a hydraulic motor. The pump will be direct drive(if there is room) or by a double belt system. The only place for a tank is near the back.

 

[DJNebraska]

What RPM will your engine turn? The pump you specified will only intermittently run at 3500 RPM.

There are pumps that will withstand the RPM's of an engine that usually runs up to 3600 RPM.

1 cube pump rated for 4000 RPM

 

[J_J]

Surplus Center - 1.07 CU IN FENNER 2S25AAC HYD PUMP

Speed:
1750 RPM cont.
3500 RPM int.

So how many GPM so you really need and at what pressure.

How will this pump be used? Maybe there is a better selection for you?

How much HP do you have to work with?

 

[ch47dpilot]

The engine idles around 1000-1200 and would have more than enough pwr around 2000-2500. May use the belt ratio so the pump runs around 1750 at 2000 eng RPM. Not sure which projects I'm going to use it for right now but have these two in my head. First I found a few hydraulic auger heads on Ebay and was thinking about taking bed off and building a way to mount it to the back. Kind of like a Toro Dingo. The other is to try and find a used sweeper that's hydraulic driven. Mount it to the front and use it to sweep the driveway. Most of the low RPM/High TQ hyd motors are in the 8+GPM and 2500+PSI range. The engine has 27HP based on Surplus Calculator I'll need 13HP to get the 8.09GPM@2400PSI. I was looking at the same pump J.J. linked to.

Since J.J. opened up the question here is what I'm thinking as an alternate to getting a used auger head. Found this motor: http://www.northerntool.com/shop/tools/product_200319051_200319051. At 8GPM it should spin at 200RPM, the 2400psi should give it full torque, I'd have to reduce it by about 1/3(the dingo RPM is 57) so I'm thinking of that option. Here's my crazy idea for the gear reduction, I know I already said it was crazy. Use 1 or posibly 2 sungear sets from an old automatic transmition. Most of the first gears are about 3:1(700R4) so it would be a good ratio. Not sure on how to actually do this but I'll figure that out once I have all the pieces gathered up I'll figure something out. I've seen some crazy ideas on this site, so I hope mine isn't the craziest