28 GPM 2 STAGE HYD PUMP Brand new, DYNAMIC two stage HI/LO pressure hydraulic gear pump. Ideal for applications such as log splitters, presses and other equipment where rapid movement of the cylinder at low pressure is required prior to automatically switching to the high pressure mode to meet load requirements. The change from LO to HI pressure is automatic with the LO stage pressure preset from 400-900 PSI. Minimum of 16 HP required for gas engine use.
Displacement: 0.465 cu. in. / rev. HI press. stage 1.860 cu. in. / rev. LO press. stage
Pump Type Gear
Pressure: 3000 PSI max.
Speed: 3600 RPM max.
Flow: 7 GPM HI press. stage 28 GPM LO press. stage
Im looking to increase my cylinder travel speed. Currently it has a Vickers vane pump, size unknown. The ram measures 2 3/3", 6" cylinder with a 24"stroke. Powered by a Hatz Wisconsin diesel, 11 hp. Previous owner only ran it at half throttle and still split anything, but slow. Motor it rated at 3000 rpm. Thinking of a bigger pump, a great box with a step up in rpm??? I'm guessing this pump is to big. I know diesels have a lot of torque and bigger cubic inches then same rated gas. Next size smaller pump? Thanks, Todd.
A: The next size smaller pump (9-7970) may still be more pump than the engine can successfully push to shift pressure and max pressure. Items 9-7503-16 or 9-7972-16 would certainly work on an 11 hp engine. Because the vane pump is a single stage pump, your cycle time will still decrease when using a two stage pump, even with the 16 gpm.
Date Submitted: 04/18/2017
hi iam wanting to run a sawmill blade circular blade 20inch with 22 horsepower gas motor wanting to know what hydraulic pump an hydraulic motor to use do you have any suggestions
A: There are many unanswered questions that need to be quantified before proceeding with your project.
Date Submitted: 04/03/2017
Can I use this two stage pump with a hydraulic motor that has a max flow of 7 gal/min? If so would I have to do something to get it to shift to high pressure to prevent damage to motor?
A: With an adjustable flow control one could control the output to the motor. 9-064-75 is the only unit that has the flow rating and relief to make that possible. This would not affect the the shift pressure, but if adjusted to 7 gpm or less the the only change would be in the produced torque when the shift to the high pressure stage occurred.
Date Submitted: 03/21/2017
What size electric motor would we need to run this pump
A: This pump would require a 15 Hp electric motor.
Date Submitted: 03/16/2017
I'm building a log splitter, I'm using a 12.9 HP Onan Generator for the engine, it runs at 1800 Rpm. I need a CCW 28 GPM pump' do you have one??
A: We do not.
Date Submitted: 03/06/2017
Is that price American or Canadian money? Would a 13hp gas motor big enough to run that pump at 7g low to create 3,000psi ? Thank you,
A: All prices are in U.S. dollars. A 13 hp would likely not be able to get the pump past the shift pressure, and if it did, would only be able to push 7 gpm to approximately 2000 psi.
Date Submitted: 02/22/2017
Hi please tell me shipping cost for Greece Athens
A: Please contact our Customer service department and they can get a quote for you.
Date Submitted: 02/17/2017
Suction side of pump has s1" fitting. Suction side line size calculations for 28gpm recommends 1.5" line sizes the reduce suction line velocities. What is the manufacturers recomendation for reliable operation?
A: We have no information from the manufacturer regarding their recommended suction line size. Customers have operated them with both sizes of inlet hose with good results. As long as it's a shorter straight shot into the pump and a flooded inlet to minimize line restriction and suction (vacuum) values, it should operate well at either line size. Friction loss and higher suction values will degrade the performance.
Date Submitted: 01/06/2017
What is the total shaft length from machine mount face surface to end of shaft. In need of a pump to replace a haladex/concentric. Shaft length in need is 1 15/16 to 2" long from machine mount surface. Will this pump fit?
A: The shaft length of this pump from mount face to end of shaft is 1.485"
Date Submitted: 09/22/2016
What will happen if I run this with a Honda 13 hp gas engine?
A: Running this pump with less than the rated horsepower could lead to the pump being unable to build enough pressure to shift to the high pressure flow, and if it does shift it may be unable to develop the full rated pressure.
Date Submitted: 08/16/2016
I will use an electrical motor to drive the pump, what is your power recommandation ? Is it right if I divide by 4 the required gas engine power to obtain the electical required power ? Regards
A: If driven at the rated rpm, it would take absolute minimum of 12 hp electric just to get it to shift into the high pressure flow. It would then take at least 15 hp electric to get the high pressure flow to 3000 psi. Dividing by 4 is not accurate in this case.
Date Submitted: 07/07/2016
What weight oil does the manufacture recommend? At what temperature ranges?
A: The manufacturer does not have a weight rating on the oil recommendation, but states the viscosity range is to be between 6 and 200 cSt. The operating temperature range for the oil is to be -12 to 175 degrees F.
Date Submitted: 05/25/2016
Where are the pump and parts made? Thanks
A: These pumps are Chinese in origin.
Date Submitted: 05/12/2016
can this pump run a wood splitter and also intermittently run another hydraulic motor for a table chain for a firewood processor application?
A: Yes, it could. Best to run one or the other using a selector valve on the output of the pump or a two section valve. For the motor it is important to see what pressure you need as if it is above the shift point in the pump it will go into low flow high pressure stage.
Date Submitted: 11/13/2015
what size is the keyway
A: These pumps have a 3/16" keyway.
Date Submitted: 11/08/2015
Will a 16hp be adequate for a 28gpm pump?
A: Yes, this pump has the high flow/low pressure (28 GPM,650 PSI) and the low flow/high pressure (7 GPM,3000 PSI) stages both sized to require 16 HP.
Date Submitted: 10/16/2015
will your pump #9-7971 take any side load from say a pulley and belt or is it just meant for a coupling setup?
A: This should only be driven directly using a shaft coupler.
Date Submitted: 02/12/2015
are these 2 stage pumps adjustable?
A: They are but that is not recommended and it voids the warranty
Date Submitted: 04/11/2014
Can the rotation of the pump be changed to CCW?
A: No they are only built in a CW rotation. This is designed to be direct coupled to the crankshaft of a small gas engine (16 HP).
Date Submitted: 03/03/2014
My measurements for the pump need to be Shaft- 5/8 Inlet- 3/4 Outlet- 1/2 Will this still work?
A: This pump has the 5/8 shaft but the ports are larger 1" NPT inlet and 3/4" NPT outlet. Due to the oilflow the pump delivers these are the port sizes required.
Date Submitted: 02/04/2014
I would like to run this pump at 1750 rpm with a 5HP electric motor. Do you see any problems?
A: That would be adequate. Keep in mind that the flow rates for each stage would be half what are listed.
Date Submitted: 12/20/2013
Can this pump be used on a vertical shaft engine
A: Yes it can be mounted vertically. Must be supported properly.
Date Submitted: 11/11/2013
What size are the fittings on the 28 gpm log splitter pump 9-7971. Suction and pressure.