Used Komatsu PC450-7 Excavator

  • DEKA | Common maintenance problems about Kobelco …

    10 GPM Pressure Compensated Pump Pressure Compensator set at 3000 PSI Relief Valve Set at 3200 PSI Flow Control Set for 5 GPM Load Pressure is 2000 PSI What is horsepower being consumed while the cylinder is extending ? 5 GPM * 3000 PSI / 1714 = 8.7 HP How much horsepower is being wasted ? 5 GPM * 1000 PSI / 1714 = 2.9 HP (HP = GPM * PSI / 1714

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  • Specalog for 321D LCR Hydraulic Excavator, AEHQ5873-01

    The Caterpillar 321D LCR excavator provides all the elements to give you the lowest cost to own and operate. At the end loss and pressure drops in the lines. System Pressure. System pressure has been increased to 35 000 kPa (5,076 psi), The pilot pump is independent from the main pumps and controls the front linkage, swing and

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  • How to Find Your GPM & PSI – Pumps and/or Wells

    6. With the pump running, watch the PSI reading on the pressure gauge, and slowly start closing the ball valve until the pump shuts off. The water pressure shown on the gauge will increase as you close the valve. (As the flow from the pump is reduced the pump produces more pressure.) Make a mental note of the pressure when the pump shut off. 7.

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  • How to Find Your GPM & PSI – Pumps and/or Wells

    A: (1) the hydraulic pump and its control system are out of order, test the P1 and P2 pump pressure, the normal value should be 32-34M. (2) test the pressure of the pilot circuit, the pressure is always around 3.0M. (3) check whether the valve and the valve seat of the walking system are worn or not. (4) check the pressure of the running motor.

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  • How Mini Excavator Hydraulic Systems Work

    Nov 07, 2016 · All brand new excavator main hydraulic pumps from His Way Manufacturing undergo a four-stage outlet pressure & flow rate test. All pumps are tested beyond OE

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  • Hydraulic Load Sensing Control

    Load sensing is a term used to describe a type of pump control employed in open circuits. It is so called because the load-induced pressure downstream of an orifice is sensed and pump flow adjusted to maintain a constant pressure drop (and therefore flow) across the orifice.

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  • Hydraulic Pressure vs. Flow: Understanding the Difference

    Mar 22, 2016 · "The higher the pressure gets in a system, the more the flow is reduced. So for example, if you wanted to equip an excavator with a felling head, which has a high pressure and flow demand, you would need to combine flow from multiple pumps. That produces the speed to turn the cutting wheel and the power to cut through a tree.

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  • Pressure Booster Pumps and Kits | JoJo

    Pressure Booster Pumps and Kits. We believe in value for money pressure pump solutions that are simple to use and provide optimum results whilst using minimal energy. Our range of water pressure booster pumps include a 0.37kW peripheral vane pump, as well as a 0.75kW and 1.5kW variable speed drive pump. We also have a pump to tank connector kit

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  • Fire Pumping Calculations: Every Pump Operator's Basic

    Jan 17, 2018 · 5 HG is the safe limit for pumping, where most people won't have any problems. Remember, everyone is different, and there is no guarantee that your gauge is calibrated correctly. So, the best idea is to start off slowly, maybe 3 HG for 5 to 10 minutes, and see how it goes the first time.

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  • Typical Hydraulic Pump Operating Pressure??? - TractorByNet

    Feb 23, 2005 · Rat and Spiker, The reason for the question was that I used to think that a tractor's hydraulic pump would not develop much in the way of pressure unless it was called upon to do some work, like pushing something with a hydraulic cylinder. Junkman's thread that I referred to above indicates that this is not the case. That there is significant pressure developed by the pump, when it …

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  • 30/50 or 40/60 PSI: What pressure to set your system to

    Feb 12, 2018 · When the pressure in the system rises to the preset high setting the pump will turn off (commonly known as the cut-off pressure). For example, at 40/60 the pump will turn on when system pressure reaches 40 psi (pounds per square inch) and turn off when system pressure reaches 60 psi. The common settings are either 30/50 or 40/60.

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  • Pump Pressure Tanks, how they work and how to set them

    With normal house pressure pumps, the operating pressure of these is usually between 200kpa and 350kpa and they shut off at a maximum of 400kpa. As these pumps are smaller in flow and work at lower pressures to an irrigation pump or a commercial pump, then there is less chance of damage occurring and they generally don't cycle as much.

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  • Fuel Pressure Explained - Injector Dynamics

    With a return system, the base pressure is set with the engine off, but the pump running. For a GM, this pressure is usually set to 58psi (factory fuel pressure in the rail). The vacuum/boost referenced regulator will help to change the pressure in the rail based on the pressure in the manifold. When an engine is idling, it may be pulling 20

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  • Hydraulic EXCAVATOR how it works? excavator working principle

    May 27, 2019 · How does an excavator hydraulic pump work? When a hydraulic pump operates, it performs two functions. First, its mechanical action creates a vacuum at the pump inlet which allows atmospheric pressure to force liquid from the reservoir into the inlet line to the pump. A pump produces liquid movement or flow: it does not generate pressure.

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  • How far can I pump water and still have enough pressure to

    Mar 27, 2018 · An easy calculation to know is that for every 10 feet of rise you lose -4.33 psi. For every 10 feet of fall in elevation, you will gain +4.33 psi. Once you know your total pressure loss, you subtract it from your starting pressure. If you have enough remaining pressure and flow rate, you're your pump will power your sprinklers with any given

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  • Fire Pumping Calculations: Every Pump Operator's Basic

    Oct 01, 2012 · If a nozzle operator is 40 feet up a hill, the pump operator needs to add pressure to overcome the head pressure working against the pump. This …

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  • Water Pressure Booster Pump - H2O Equipment

    Well water may not always provide the best water pressure. You may notice in your sinks and especially the shower where you are using a higher volume of water. With a Booster Pump, you will be amazed at the difference in water pressure. If you don't absolutely …

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  • low hydraulic pressure in excavator - Fluid Power

    Pump Pressure Tanks, how they work and how to set them

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  • Pneumatic System Equipment (PSE) Pump - W220 S-Class

    The Pneumatic System Equipment (PSE) Pump does the closing of the doors and trunk with pressure. It either increases or decreases the pressure in the lines causing the movement of pistons in actuators, which in turn move levers in the various latches, which pull the doors or trunk closed. Notice that the PSE Pump is very clever, and can both

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  • Hydraulic EXCAVATOR how it works? excavator working principle

    May 27, 2019 · How does an excavator hydraulic pump work? When a hydraulic pump operates, it performs two functions. First, its mechanical action creates a vacuum at the pump inlet which allows atmospheric pressure to force liquid from the reservoir into …

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