How to Select Hydraulic Pumps Image Credit: Haskel International, Inc. | Grainger Industrial Supply | Continental Hydraulics   Hydraulic pumps are positive displacement pumps which pressurize hydraulic fluid in order to do work. They are powered by mechanical energy sources which apply force directly to a movable volume of liquid. Hydraulic pumps are simple pumps, but are able to achieve some of the highest pressures among pump types.   Operation Hydraulic pumps...
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Q & A on Hydraulic Pumps

We asked our users for their input on Hydraulic Pumps. Here are the results of 280 users familiar with Hydraulic Pumps.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing hydraulic pump design?
43 answers
Answers:
High pressure water jet cutting and deep bore hole mining. I think robotics are using more and more as the number of procedures they are using perhaps. Auto body welding machinery. underwater welding submersibles. Lots of advancements in multiple categories.
~Scott H, Project Manager, Kelso, WA
Higher flows and pressures needed to run bigger equipment. Also more hyd are being used on farm equipment.
~JERRY S, OWNER OF A REPAIR SHOP FOR AG EQUIPMENT, COLUMBUS, WI
The cylinder bore size, the clearance between cylinder and ram, valve design are most important.
~Sarvjot singh Singh, Production Engineer, Una, India
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Q:
From your perspective, which companies are creating the most innovative hydraulic pumps?
40 answers
Answers:
Parker Hannifin, Bosch Rexroth
~Jim Y, General Management, Shanghai, China
Vickers and Eaton corp. provide much online computer help.
~Steve M., Retired high school shop teacher/electrician, Snow Hill, NC
Rexroth, Denison, Parker, Eaton
~Engineering, Design, Edinburgh, Australia
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Applications and UseTop

Q:
What are some of the applications you have used a hydraulic pump for?
69 answers
Answers:
I want to know about 345bl excavator pump.
~Uae Rak, Engineering Consultant, Rak, Dubai
Maritime machinery. Hydraulic lifting equip, propulsion and steering, door and hatch operation, both on ships and boats and the machinery required to build and repair such.Logging machinery. Fishing and processing machinery, Lumber and pulp milling and manufacturing machinery and the machinery required to manufacture and repair the former. Farm equipment and implements, forklifts and processing machinery in canneries and warehouses. Anything else you can think of that an industrial mechanic and machinist might encounter.
~Scott H, Project Manager, Kelso, WA
Robots, animatronics, winch drives, vehicle drives, conveyor drives, positioning systems, conveyor run out correctors, re-generator turbine drives, industrial pump systems, carriage drives, mobile equipment systems, veterinary surgical tables, various servo systems, aircraft systems, marine deck machinery systems, etc. literally hundreds and hundreds of specific applications too numerous to list.
~Rod R, Design Engineer, Victoria, Canada, B. C.
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Q:
Please share with us any “non-standard” applications that a hydraulic pump has been used for.
26 answers
Answers:
I have seen fluid pumps set up to compress air on tire trucks. PTO's have been used for this. I also have seen hydraulic pumps rated and designed for bunker oil used to pump bentonite in mining and cable following proceedures. I also have seen v 8 engines set up to rund fuel on the left bank and the right bank used as an air compressor. I am no longer amazed at the creativity of low budget mechanics undertaking less than perfect solutions to "git er done" when the show has to go on.
~Scott H, Project Manager, Kelso, WA
Conveyor belt run out corrector (details not for disclosure at this time) using reversible pumps. Turbine re-generator using high speed pumps. Artificial lifts. Amphibious robot. Animatronics.
~Rod R, Design Engineer, Victoria, Canada, B. C.
As a licensed electrician, i discuss with local farmers how to replace electric motors or gasoline motors with hydraulic motors - such as on grain bins, feed augers, and irrigation systems.
~Steve M., Retired high school shop teacher/electrician, Snow Hill, NC
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Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of a hydraulic pump?
20 answers
Answers:
Too numerous to list in detail. I have seen pumps that have literally blown apart due to over pressure. Burned up due to poor system design and pump choice. The list goes on. Not paying attention to possible power surge type demands and equipment use. It should be pointed out that allot of these issues center around not just the incorrect usage of the pump but poor system design.
~Rod R, Design Engineer, Victoria, Canada, B. C.
Yes we have seen many. Most system designers forget the fact that when using water glycol as a system media. that all components pressure rating and speed rating are reduced.
~Lyle S, Marketing/Sales, Houston, TX
1 - Hydraulic pump too small to run a system, ie, flow volume too small resulting in some circuits not functioning or slowing down.
~Anthony R, Maintenence manager, Bogor, Indonesia
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
35 answers
Answers:
The best wish would be for industry standards becoming more uniform. It would be nice to pick up the phone and find a replacement pump off the rack in times of breakdown. Nobody likes to invest money in spares.
~Scott H, Project Manager, Kelso, WA
Smaller design envelope, faster speeds, new lighter build materials, built to operate with more Eco friendly materials, (although good now) improvement in electronic control integration.
~Rod R, Design Engineer, Victoria, Canada, B. C.
Flow/Discharge Pressure: 20gpm@5000psi/300 gpm@100 psi Wide range of media compatibility: Hydraulic oil/Skydrol/Turbine Oil 23699/Jet A Fuel. Temperature: up to 400°F
~R. A., Engineer, Naples, FL
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Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of a hydraulic pump?
20 answers
Answers:
Again, don't go cheap; I have seen hundreds of applications where the use of cheap pumps and other components mean using as much as 30% or more connected horsepower. Make sure you are full aware of not only the normal power consumption in your system but also intermittent demands. Make sure you have the proper control in variable speed and pressure systems. I have seen systems with expensive controls on the pump that will never be used and I have seen the opposite end as well, where flow and pressure control valves are used with fixed displacement pumps.
~Rod R, Design Engineer, Victoria, Canada, B. C.
Do not under size the suction or inlet line to the pump. If anything, up size this line to the pump larger then the inlet port size. Never downsize. Even with a pressure comp or pressure limited pump still install a system relief valve.
~Lyle S, Marketing/Sales, Houston, TX
Make sure the power unit will be large enough not just for the pump but for accessories you may purchase in the future. The possibilities are endless as far as accessories.
~Builder/Contractor, Newport, KY
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Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using a hydraulic pump?
27 answers
Answers:
As an end user, do not skimp on quality. The biggest mistake I have seen in over thirty years of being involved in the industry is seeing users look at short term price (opting for cheap inefficient pumps and other system components) instead of long term gain. This happens over and over again with many hydraulic design engineers and component distributors perpetuating this problem by promoting the cheaper alternatives to "get the contract" vs designing a system that will last. This is a vicious circle that has been going on for decades. It wastes power and eventually cost the end user more money in the long term due to higher energy costs and higher replacement component costs. I have seen a slight change away from this with the current energy savings push but we still need to re-educate industry.
~Rod R, Design Engineer, Victoria, Canada, B. C.
Ensure that when installed the system and pipework allow for the recommended maintenance envelope, that there are sufficient isolating valves and self sealing coupling to allow for flushing and filtering of the system without having to "break" the pipework.
~Engineering Manager, Barrow-in-furness, UK
In new start ups, make sure the piping in the system is clean. More equipment is damaged at start up by dirt in hose and piping than any system or equipment abuse.
~Lyle S, Marketing/Sales, Houston, TX
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