oldnslo
Super Member
No separate reservoir required.
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Hydraulic motor and pump help
- Thread starter Metalburner
- Start date
- Views: 36125
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
- 16,985
- 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.