Frequently Asked Questions

Q: How do I find a Parker HPS Distributor?

A: Visit the Where to Buy link and add your location either an address or zip code.

Q: When should I contact a distributor verses HPS directly? 

A: For help with service and support, please contact your local authorized Parker distributor. For other inquiries, please complete the Contact Us fields for HPS support.

Q: How do I contact Hydraulic Pump and Power Systems' Customer Services Team?

A: Please email hps.support@support.parker.com

Q: How do I contact Hydraulic Pump and Power Systems' Technical Services Team?

A: Please email hps.technical@support.parker.com

Q: Where are hydraulic pumps used?

A: Hydraulic pumps are used in a variety of applications including agricultural and construction equipment, marine, mining, and oil and gas. For example, hydraulics are used in sugarcane harvesters, backhoes, consumer speed boats, mining recycling equipment and on oil rigs.

Q: When should I use a piston pump?

A: Piston pumps are typically used when variable flow is desired and/or the application requires higher pressure and flow because piston pumps typically have higher efficiency than other pumps at high pressure.

Q: What are the main types of hydraulic pumps?

A: Gear, Piston, and Vane pumps are the three main types of hydraulic pumps. 

A gear pump is a very common type of pump used in mobile applications. It is less complex with fewer components, and relatively inexpensive. Gear pumps are fairly tolerant to contamination in the system’s oil, however large contaminants will be ground up by the gear pump, which may damage system components that are downstream of the pump. Gear pumps are fixed displacement pumps meaning the same volume of oil will be displaced each time the gears rotate; therefore, flow can only be adjusted by increasing or decreasing the prime mover speed. 

A piston pump is more common in hydraulic systems where higher operating pressures, controllability, and high performance is required. Piston pumps are more complex, as there are many more moving parts involved. Piston pumps have a higher initial cost due to the complexity of design and components. Piston pumps are the best pumps for applications that need variable flow but have a primary mover with a fixed speed. They also require higher levels of fluid cleanliness due to the tighter tolerances that provide greater performance. Most often, piston pumps are configured as variable displacement, however, fixed displacement versions do exist.

Vane pumps are durable against oil contamination, as they are considered wear compensated. Vane pumps are quiet, making them ideal for industrial applications that require lower noise levels. They also typically perform better than gear pumps under high cycle applications due to the wear compensating nature of the vane design. Vane pumps can provide large amounts of flow, while occupying a small envelope. These pumps are largely fixed displacement, however that displacement within a specific frame size can be easily changed without changing the outside envelope. Vane pumps are typically positioned between gear and piston pumps when it comes to cost, performance, and pressure rating. The vane pump’s biggest advantage is its low noise levels.

In summary, these are the 3 main types of hydraulic pumps. However there are sub-types of each of these pumps such as variable vane, internal gear, external gear, helical gear, radial piston, axial piston, and bent axis piston pumps, which all have their own distinct advantages and disadvantages. 

Q: What do hydraulic pumps do? 

A: Hydraulic pumps take mechanical energy from a primary mover, such as an internal combustion engine or electric motor, and create flow of hydraulic oil through a system. This flow is then transferred through connectors, hoses, and orifices to a hydraulic actuator such as a cylinder, rotary actuator, or motor. Hydraulic pumps create flow (GPM/LPM), hydraulic pumps do NOT create pressure (PSI/bar). Resistance to this flow creates pressure. 

Q: What is the most common Hydraulic Pump?

A: Gear pumps are the most common type of hydraulic pump. Gear pumps are simple, cost effective, durable, and have a plethora of suitable applications.

Q: What are the two types of Hydraulic Pumps?  

A: There are actually three common types of hydraulic pumps: Gear, Vane, and Piston Pumps. However depending on the application, the hydraulic pump may need to be fixed or variable displacement. Gear and vane pumps are typically considered fixed displacement pumps since the only way to control their flow is subject to the speed of the system’s prime mover. Piston pumps can be fixed or variable displacement. Variable displacement is achieved when the piston pump’s swash plate angle can be adjusted. As the angle of the swash plate increases, the stroke of the pistons lengthens, forcing them to displace and transfer more oil per revolution.hen bonding larger assemblies involving dissimilar materials, such as aluminum or steel to polycarbonate or acrylic, differences may exist in the expansion coefficients of metal and plastic. Adhesives and design need to accommodate the varying rate of thermal expansion.

Q: What are the four types of Hydraulic Pumps?

A: There are three types of hydraulic pumps: Gear, vane, and piston pumps. 

Q: What is the best hydraulic pump?

A: It is impossible to say which is the best hydraulic pump without knowing the application requirements. When determining the best hydraulic pump for your application, system characteristics must be known such as flow rate, operating pressures, pressure cycles, ambient conditions, oil cleanliness, and additional factors.

Q: What are 5 hydraulic devices?

A: The main components of a hydraulic system are: Reservoir, Connectors/Hoses, Pump (The pump requires a primary mover, such as an engine or electric motor, in order to create flow), Valve, Actuator (Motor, Cylinder, Rotary Actuator).  A few auxiliary components would be Accumulators, Coolers, and Filters.  In a perfectly sized system with clean oil and no inefficiencies a hydraulic system would only need the five main components. However, oil becomes hot, contamination infiltrates your system, and your application may demand excess flow for certain functions. All of these issues have remedies provided by the auxiliary components.

Q: How do I choose a hydraulic pump?

A: The best course of action to take when selecting a hydraulic pump is to consult with a Parker territory manager or account manager. Before reaching out, collect as much information as possible about the system being designed. When sizing a pump for a hydraulic system, a good place to start is with P.F.A.

Pressure - What is the operating pressure of the hydraulic system? This includes continuous operating pressure as well as any spikes in pressure that the system may experience.

Flow - How much flow will your actuators require?

Application - Provide as many details as possible about the function of the system as well as the environment that it will be working within, such as, what type of prime mover?, operating speed?, desired controls?, fluid type?, and duty cycle.

Q: Does HPS offer product training? 

A: Yes, our product training courses are available to Parker and authorized distributor associates, including Field and Inside Sales, Customer Service, and New Hires.

information about our product training is located at: HPS Overview Training 

Q: Why should I choose Gold Cup?

A: The Gold Cup pump and motor provide benefits of long life, precise control accuracy, best in class response time for hi-shock applications, and complete drive solutions with built in customized configurations. It's well known in the industry for the most Extreme Duty applications.

Q: How do I properly size a Gold Cup Pump or Motor?

A: In an effort to ensure that the right Gold Cup is selected for your drive, we have created a tool to calculate your unique variables to determine the best fit components. To get started, click on the link Located Here. 

Q: How do I find an authorized repair center for HPS Products?

A: Only genuine Parker parts used by an authorized repair center assure that our product will be repaired to the exact original configuration and perform the same as when brand new.  Parker's hydraulic pump replacement parts range from individual parts to kits, including: controls, basic rotating group, manifolds, shaft assemblies, piston shoes with retainer, and others. For an authorized repair center, Click Here.

Q: Does Parker offer condition monitoring solutions for hydraulic pumps?

A: Yes. The Gold Cup-IE (Intelligence Enable) pump is configured to monitor temperature, pressures, drain flow, as well as pump displacement. All sensors data is fed to an on-board Parker IQAN controller, which provides the user to the ability to access via CAN. With the addition of Parker's gateway, the data can be stored in the cloud and easily monitored via configurable dashboards using IQAN connect. The Gold Cup-IE can be factory supplied, or installed onto existing applications by using the field retrofit kit.

Q: Does Parker offer a guide for identifying Gold Cup Port Locations?

A: Yes, this document provides some common Gold Cup configurations in 3D views with port size and location identified. 

Q: What is the difference between D, H, and V-Paks?

A: D and H-Paks utlize fixed displacement gear pumps. V-Paks use variable displacement piston pumps. D-Paks have a 5 gallon reservoir, while H and V-Paks are available in 10, 20, 30, or 40 gallons.

Q: What is the difference between a P1 and PD hydraulic pump? 

A: PD is designed for lower noise operation at industrial electric motor speeds of 1500-1800 rpm, so it's typically used in industrial applications. 1800 rpm should not be exceeded. P1 can go to higher speeds, but is louder, so more common for mobile applications.

 

 

Q: Are there any instructions on how to convert a P1/PD B Mod controller to a variety of other controllers?

A: How to videos on converting a P1/PD Mod controller to a variety of other controllers including AM, C0, L2, L0 or L2 are available on the P1/PD's product page. 

Q: What is the default direction of rotation of the GVM?  

A: If the GVM is invertern controlled by a Parker GVI inverter and connected as mentioned in the installation manual, for a positive speed command the motor will run clockwise seen in front of the shaft.

Q: How was the salt spray test conducted?

A: The salt spray test was conducted as specified in SAE J1455 and the motor was still running at the end of the test.

Q: How is the feedback device aligned? What angle is the feedback device aligned?

A: Aligned 0 degree offset

50% Continuous Current

Phase A and B Negative Current (-)

Phase C Positive Current (+)

Resolver Stator and Sin-Cos Encoder Board physically adjusted to a Cosine at a maximum Voltage; abs(Cos(MAX))=abs(Sin(MIN))

REFERENCE 3.10.3

Q: Does the motor come with hydraulic fittings?

A:   The motor does not come with hydraulic fittings for the coolant ports

Q: Can you use hydraulic fluid to cool the motor? 

A:  Yes you may. However, your performance will decrease compared to WEG. Please consult Parker for oil cooled motors simulation data.

Q: Does the motor need to be cooled? If so, what coolant is required or allowed? 

A: The motor does not have to be water cooled, however please note that using only ambient air cooling will result in very low performance from that motor. It also comes down to the duty cycle of the application. Please consult Parker for air cooled performance motor simulations.  

Q: What is the maximum mechanical speed? 

A: The maximum mechanical speed can be limited by:

1) Temperature, as a motor runs at higher speeds the mechanical losses, which are an approximate function of speed squared, will begin to dominate the motor temperature rise. The thermistor should be monitored to prevent the motor from overheating.

2) Bearing load, motors with little or no axial and/or radial load applied to the shaft will last the longest if it is used at high speed for extended periods. As the loads on the shaft increase, the bearing life will decrease. Refer to the GVM manual for more information on bearing L10 life as it relates to bearing load.

3) Rotor destruction speeds, there is a speed for which the motor will become mechanically and permanently damaged if the rotor speed exceeds the limit. The limit is different for the different frame sizes. If a 10% margin is required for an overspeed condition, reduce the numbers in the table by 10%.  

Maximum intermittent speed:

GVM142: 17,000 RPM

GVM210: 11,000 RPM

GVM310: 9,000 RPM

4) Inverter electrical frequency may invertors have a maximum electrical frequency that it can supply to the motor phases. This electrical frequency limit, along with the motor pole pairs, will determine the maximum shaft speed. The maximum shaft speed is proportional to the maximum electrical frequency, and the motor pole pairs as indicated in the equation below:

(Max Shaft Speed, RPM) = 120* (Max Invertor Freq, Hz)/(Number of pole pairs)

 The GVM142 and the GVM210 contain 12 pole pairs on the rotor.

The GVM310 contains 16 pole pairs on the rotors.

Example: If the invert has a 600Hz frequency limits, the maximum shaft speed for the GVM motors is:

GVM142 and GVM210 maximum speed is: 120*600Hz/12 = 6,000 RPM

GVM310 maximum speed is: 120*600Hz/16 = 4,500 RPM

Q: What material is the shaft and housing made from? 

A:  8620 steel, hardened to 54-58 Rhc

Q: How hot can the motor get before damage to stator? 

A:  The GVM motor contains a thermistor installed in the motor, which is closely coupled to motor winding. The motor can run until the sensor indicates the winding is at 150° C, at which point the motor intermittent current should not be permitted to exceed continuous current. As the measured winding temperature dips below 150° C, the intermittent current can increase to up to 100 of the published intermitted current at a winding temperature of less than 129° C.

The reason the maximum intermittent current must be limited at temperatures between 129° C and 150° C has to do with the thermal capacity of the thermal sensor and the electrical insulation installed over the sensor. The combination of the two parameters causes a time lag in the sensor reading. More information about the current derate with temperature can be found in the manual. Otherwise, the GVM motor is equipped with an electrical insulation system that is rated for 180 ° C continuously according to the manufacturer specification of the materials.

Q: Can the GVM regenerate electricity back to the batteries? 

A:  Yes, If the inverter is commanded to apply a negative torque while the shaft speed is positive the shaft power minus the motor and invertor losses will regenerate into the battery. The same will happen if the speed is negative and the torque is positive.

Q: Can you paint the motor? 

A: The motor housing is aluminum. With the proper surface preparation, the motor may be painted. The shaft, shaft seal, water ports, connectors, ground points, etc... will need to be properly masked.   

Q: How do I mount the motor? 

A: Reference Mounting...... Page XX

Q: What communication is used for the motor?  

A: Feedback is the only communication. It does not communicate directly via CAN BUS. Not integrated and an interverter is required. 

Q: Are lifting hooks included with the motor? 

A:  Lifting hooks are not included with the motor upon shipment.

Q: What shafts are available for the GVM motor?  

A: SAE standard and traction shafts