oldnslo
Super Member
No separate reservoir required.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
Hydraulic motor and pump help
- Thread starter Metalburner
- Start date
- Views: 37480
More options
Who Replied?
OP
Metalburner
Member
Instead of using a Civic radiator, could I get away with a transmission, oil or power steering cooler instead? I'm missing something because, to me adding a cooler would increase capacity of fluid a little bit, so how would it decrease?
oldnslo
Super Member
By installing a heat exchanger / cooler you are removing heat from the system. By removing the heat you can use a smaller reservoir. Not uncommon to see mobile equipment with 8 - 10 GPM pumps running on a 3 -4 GPM reservoir. This is what a lot of CUT tractors have.
Our 2-85 (85 HP) White had a 20 GPM pressure compensated pump and 8 gallon reservoir. Continuos use and it would over heat in about 1 to 1 1/2 hrs.
Our 2-85 (85 HP) White had a 20 GPM pressure compensated pump and 8 gallon reservoir. Continuos use and it would over heat in about 1 to 1 1/2 hrs.
OP
Metalburner
Member
Okay thanks for clearing that up. So could I use an auto cooler or does it need to be for hydraulics?
oldnslo
Super Member
Okay thanks for clearing that up. So could I use an auto cooler or does it need to be for hydraulics?
Items to consider when selecting a heat exchanger / cooler.
Pressure drop Vs flow characteristics: Target is usually in the 5 - 10 PSI range under normal operating conditions. Check for drop with cold oil or install a by-pass valve to prevent over pressurization during cold start up.
Heat removal Vs air volume moving past it. Some catalogs are in BTU/hr some in HP.
pressure rating: In a return line this shouldn't be a concern but I don't have a clue what pressures tranny coolers run at.
OP
Metalburner
Member
Trans coolers should run around 20-25psi or so from what I can find.
aczlan
Good Morning
- Joined
- Mar 7, 2008
- Messages
- 17,540
- Tractor
- Kubota L3830GST, B7500HST, BX2660. Formerly: Case 480F LL, David Brown 880UE
Yes, but the reason for the radiator is that 30gpm at 30psi will need at least a 1" pipe, the cheapest way to get that is an automotive radiator.Instead of using a Civic radiator, could I get away with a transmission, oil or power steering cooler instead? I'm missing something because, to me adding a cooler would increase capacity of fluid a little bit, so how would it decrease?
Aaron Z
OP
Metalburner
Member
28"x13" is pretty huge. Wonder if there is one smaller that'll fit a lot just as effective.
OP
Metalburner
Member
This maybe a better fit. Spectra Premium Radiators CU1732 - Free Shipping on Orders Over $99 at Summit Racing
oldnslo
Super Member
I'm coming up with a parts list for the mechanical and hydraulics needed, I know I'll be missing lines, but this should give me a visual of what I'm looking at and you guys can amend my list as you see fit.
1. Honda GX688 http://www.northerntool.com/shop/tools/product_200431124_200431124
2. 2 Hydraulic pumps 1.1 cu in WHITE HYD PISTON PUMP 111812
3. 2 Hydraulic Wheel motors 19.6 cu in WHITE DRIVE PRODUCTS 25532A631AAAAA HYDRAULIC MOTOR
4. 2 2" bore 18" stroke hydraulic welded cylinders 2x18x1.125 DA HYDRAULIC CYLINDER WOLVERINE WWCL218-S
5. 1 2" bore 6" stroke 3pt hitch cylinder 2x6x1.125 DA HYDRAULIC CYLINDER WOLVERINE WWCL26-S
6. 1 2" bore 14" stroke cylinder for bucket curl http://www.surpluscenter.com/Hydrau...C-CYLINDER-WOLVERINE-WWXT2014-S-9-8771-14.axd
7. 1 5.5gpm hydraulic pump for FEL and 3pt Hitch http://www.surpluscenter.com/Hydrau...cu-in-DYNAMIC-GPF1061PA-HYD-PUMP-9-7768-D.axd
Just have miscellaneous spool valves, hydraulic lines and fittings, 8 sprockets for #100 roller chain, unsure amount of feet of #100 roller chain (40'-80'), 14 smaller sprockets to act as bogies or tensioners for track, 25 various pillow block bearings for chain sprocket/pulleys. Hydraulic cooler, hydraulic oil filter(s). 10 1" solid steel axle shafts. 30' of 2x4x1/8 rectangle tubing, 20' 1x1x1/8 angle iron, 2 4'x8' expanded steel, 3 4'x8'x14ga sheets of sheet metal. Various sizes of grade 8 bolts.
Not my money or machine I would seriously look at finding smaller displacement pumps that will operate at higher pressure.
Reasons for this are:
1) differential pressure across a motor equals torque. If you can find a pump and motor that operates at 3,000 PSI Vs 1450 you will have the same torque with a motor that has half the displacement
2) line sizes figuring the 19.6 motor at 100 RPM (3 MPH) = 8.6 GPM at 15 FPS (feet per Second) velocity requires 1/2" hose
3) Mechanical and friction losses. Bigger the pump the more power it takes to turn it doing no work.
I don't know who makes smaller higher pressure closed circuit pumps but I would look at companies like Sauer Danfoss possibly 15 series. Eaton light or medium duty, Parker, Rexroth A10VG series , Kawasaki K3VG series. These are all companies that make HST units but Again I don't know what sizes.
