Select a category from the drop-down menu below to find answers to frequently asked questions you may have about pump identification and components, accessories, certifications, oil, or system design. If you cannot find what you are looking for, contact our technical support team at email@example.com.
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Do I need a regulator/relief or unloader valve in my pumping system?
All pumping systems should include both a primary regulating device (regulator or unloader) and a secondary pressure relief device (relief or pop-off). A regulator is used to maintain system pressure while an unloader is used to set system pressure and relieve pump pressure when the gun is closed. Regulators are most commonly used in continuous flow, open nozzle systems. Unloaders are often used with on/off trigger guns (i.e., one or two gun applications).
Review our Regulator vs. Unloader video, and Reference Document below for further explanation:
Do I need a relief or pop-off valve in my system?
We recommend that all pumping systems include a relief or pop-off valve as a secondary pressure control device to insure the pump is protected should the primary pressure control device (regulator or unloader) malfunction. The secondary relief valve should be set approximately 200-300 psi above the unloader or regulator set pressure.
What is a thermo valve, and why do I need one?
Thermo valves (thermal valves) are an optional accessory most commonly used on assembled pressure washer units. When the pump is in bypass mode (trigger not squeezed), the pump is still pumping water. This water inside the pump re-circulates and can get hot after a few minutes. The thermo valve is designed to open up at a certain temperature and let some hot water out of the pump so that fresh, cooler water can replace it in order to prevent damage to internal pump parts from excessive heat.
We recommend adding a thermo valve in pump systems where the unloader bypasses back to the pump inlet rather than bypassing back to an external supply tank.
Review our Thermo Valves Whiteboard Sessions video below for further explanation:
What is an Easy Start/Quick Start Valve and why do I need one?
Many pressure washers will come with an optional accessory installed to make start-up easier. This Easy-Start valve bypasses pump flow back to the pump inlet during startup and closes once the pump is up to full speed. If you suspect you are having problems with your Easy Start Valve, review our Easy Start Troubleshooting Tips Video for further assistance in troubleshooting:
When do I need to use a pulsation dampener?
In most applications the use of an accumulator to reduce pump pulsations is recommended to minimize piping vibration and extend the life of downstream components (i.e., regulator and unloader life is extended). Some of the system improvements of pulsation dampeners are noted below.
- Water hammer reduction with systems using long discharge lines
- Improve low rpm installation performance
- High cycle rate application improvement
- Applications requiring smooth flow (i.e., hydrostatic testing, pressure sensitive membranes used in reverse osmosis applications)
- Protection of downstream components (i.e., regulators, unloaders, relief valves)
- Reduction in operator fatigue in hand-operated systems
Review our Pulsation Dampeners Whiteboard Sessions video below for further explanation:
What is a pulse pump used for and how does it work?
A pulse pump supplies chemical downstream of the pump and will fit on select pump models. This is unlike chemical injectors that supply chemicals on the supply side of the pump. The primary advantage of the pulse pump is that it allows a user to select a less expensive pump (i.e., brass vs. stainless steel) and still manage harsh chemicals in the system because the chemical is supplied downstream of the pump instead through supply side of the pump.
We have two models designed exclusively to work with our piston pumps (6300 and 6305). We another two models that will fit on either piston or plunger pumps. The 6340 is capable if 2000 psi injection and the 6350 is capable of 3000 psi injection. For further information on the pulse pumps, see the literature below.
What tools are needed to service my pump?
Basic metric tools will be needed. Cat Pumps also uses special tools on some models. The tool part numbers and fastener torque specifications for all pumps are indicated in the technical bulletin below. Torque specifications are also published in the service manuals for your pump.
What inlet filter should I use?
For standard or normal water applications use an 80 mesh (177 micron) filter. For liquids with abrasive or suspended solids (i.e., reclaim water) finer filtration is necessary to avoid pump damage. The filter element should be cleaned regularly to prevent inlet restriction and the risk of cavitation. If filter is fouling too quickly, installing another filter in parallel to intake of the pump may resolve the issue. If not, a more sophisticated filtration system might be required. For further information on filtration, see the links below. If you need further assistance with filter selection, contact Cat Pumps.
How are nozzles sized, selected and identified?
Nozzles can be sized by using the “Nozzle Selection Chart” (see the link below). This chart defines the nozzle-number, nozzle orifice diameter, and flow rate at various pressures. The nozzle-number is an industry standard for nozzle size which is equivalent to the nozzle capacity (gpm) at 4000 psi. For example, 3.0 nozzle-number (orifice diameter of .043”) has a 3.0 gpm flow rate at 4000 psi.
After the nozzle-number is selected, the desired spray angle is chosen. Spray angle is defined by degrees. Common spray angles include 0°, 15°, 25°, and 40°).
The nozzle-number and spray angle are stamped on the nozzle. For example, a 4-25 nozzle means, the nozzle number is (4) and has a .052” diameter orifice and will produce 4.0 gpm @ 4000 psi. The (25) represents the fan angle, 25°.
Verify the pumps rated flow rate and pressure can be used with the nozzle selected. For example, if my pump was rated at 3 gpm @ 3000 psi, the largest nozzle number the pump would support the flow and pressure of the pump is a 3 nozzle.
Review our Nozzle Sizing Whiteboard Sessions video, and Nozzle Selection Chart below for further explanation:
Can I purchase Cat Pumps direct?
Cat Pumps are sold through a distributors and large OEMs. We have a very extensive, worldwide, distributor network. These distributors have invested time, training and inventory to offer quality support for our products. They are conveniently located in all major cities in the U.S. and Canada, as well as, many countries around the world. They provide convenience and assistance in the selection, installation and servicing of Cat Pumps. In addition, Cat Pumps are used by a large number of specialized OEMs who choose to service their own equipment.
To find a distributor near you, click here and you will be routed to our Distributor Search page.
What SIC/NAICS classifications used for Cat Pumps products?
Our industrial classification is SIC 3561 and NAICS 33399 and 333911 (Pump and Pumping Equipment Manufacturing). We are included in this U.S. industrial group comprised of establishments primarily engaged in manufacturing off general purpose pumps and pumping equipment such as reciprocating pumps, water system pumps, oil well and oil field pumps. Cat Pumps are specifically triplex, high pressure, reciprocating, positive-displacement piston and plungers pumps. We also specialize in custom engineered skid-mounted pumping systems.
What is the warranty on Cat Pumps products?
For limited warranty information on our products, refer to the Warranty link below.
Where can I obtain warranty service?
Warranty repair is typically performed at Cat Pumps factory. However, in some cases large OEMs perform their own warranty service. Visit your local distributor for evaluation.
Are your pumps ATEX certified?
Many pumps are certified for ATEX 2, Zone 1 or 2 including Models 45 and all 15, 18, 25, 28, 35, 38, 60, and 68 frame pumps. These ATEX certified high pressure pumps will be specially labeled and come with a signed ATEX certificate. Both ATEX2 and ATEX3 pumps will be numbered with the ATEX 2 or ATEX 3 suffix added to the standard pump part number.
Under the ATEX Directive, equipment is designated by the type of potentially explosive atmosphere in which the equipment is to be used.
- Group 1 for underground mines
- Group 2 for surface industries
In Group 2 ATEX also defines categories of equipment, specified by their protection characteristics. It also designates the hazardous location zones.
- Zones 0, 1 and 2 for gases
- Vapors and mists and zones 20, 21 and 22 for dusts
Cat Pumps ATEX 2 certified pumps include Group 2, Category 2, Zones (G) 1 & 2 and (D) 21 & 22. Cat Pumps.
ATEX 3 certified pumps include Group 2, Category 3, Zone (G) 2 & (D) 22.
Please contact our technical sales team with any questions you have on our ATEX pumps.
What is a CE Mark?
In 1985 the European Community established a uniform marking system known as the CE marking system to ensure free trade of products between member states and that products comply with applicable European legislation related to health, safety, environment and consumer protection. CE mark is not a third-party certification, but placed on the product by the manufacturer or representative. The directive defines machinery as an assembly of linked parts or components, at least one of which moves, with the appropriate actuators, control and power circuits, etc joined together for a specific application. The individual components of the machinery do not have to carry the CE Mark. However, some safety components sold in the market separately will need to bear the CE Mark.
Some products offered by Cat Pumps have European origins and will have the CE marking on the product. Typically, ours pumps and custom pumping systems meet these prescriptions of the directive:
- PR EN 563 temperature of touchable surfaces
- PR EN 809 pumps for liquids-safety requirements
- EN 292-1-2-3 safety of machinery
- EN 294 safety distances to prevent danger zones being reached by the upper limbs
Contact us for specifics on your pump or custom pumping system. Additional information can be found at the UL web site (http://www.ul.com/international/index.htm, select CE marking).
If a product is desired to meet ATEX certification, it must usually meet the following directives:
- EC-Directive 89/392/EC (Machinery), Standard: EN 809.
- EC-Directive 97/23/EC (Pressure Equipment), Standard: EN ISO 16330 3. EC-Directive 99/92/EC Specifically Article 137. Information to be supplied as specifically requested by the customer.
- EC-Directive 89/392/EC (Machinery Noise)
- EC-Directive 94/9/EC (ATEX)
- Customer supplied data:
- EC-Directive 1999/92/EC, Standard: EN 1127-1 Other directives potentially applicable to power units:
- 1973/23/EC Low Voltage: Electrical equipment operating between 50 and 1000 VAC or 75 and 1500 VDC, EN 60204-1, and IEC 61010-1.
- 1989/336/EC EMC: Electrical equipment that may produce or be affected by electromagnetic energy
- EC-Directive 1999/92/EC, Standard: EN 1127-1 Other directives potentially applicable to power units:
Are Cat Pumps ISO certified?
Our manufacturing facility has been ISO 9001 certified since 1994.
Where can I find SDS Sheets?
SDS (Safety Data Sheets) information on our Cat Pump Crankcase Oil, R-Series Crankcase Oil and gearlube are located on the back page of their respective data sheets. You can also downlaod a .PDF version by clicking a link below, or visiting our Reference Documents page.
Are Cat Pumps products RoHS compliant?
Our products are RoHS compliant as of July, 2006. RoHS (Restriction of Hazardous Substance) is the European act that was implemented July 1, 2006. It is part of EU directive 2002/95/EC which restricts the use of certain hazardous substances in electrical or electronic equipment sold or used in the European Union after July 1, 2006. The substances include lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers. Some of the pump components affected included studs, washers, bolts, screws, and connecting rods.
What crankcase oil should I use?
Cat Pumps requires the use of its specially formulated High-Pressure Pump Oil. Cat Pumps custom-blended, High-Pressure Pump Oil is exclusively designed, tested, and proven to maximize the life of Cat Pump products. This specially formulated, premium-grade, petroleum-based, ISO 68 hydraulic oil contains an advanced additive package to protect against wear, oxidation, rust, and corrosion.
- Anti-wear additives protect metal to metal drive surfaces, extending drive life
- High oxidative and chemical stability resists deposit formations and provides consistent fluid performance
- Premium anti-corrosion additives offer protection in the most demanding operating environments
Cat Pumps Genuine Crankcase Oil Part Numbers:
- 6107 - One 21 oz. bottle
- 6100 - Case of twelve 21 oz. bottles
- 6102 - One 2.5 gallon jug
- 6105 - Twin pack of two 2.5 gallon jugs
- 6109 - One 30 gallon drum
Previously, select recommended alternative oils were acceptable. Some oil manufacturers changed their oil formulas, leading to pump problems. For this reason, Cat Pumps does not recommend the use of any alternative oils.
Where can I purchase Cat Pumps oil?
Cat Pumps oil can be purchased through any local Cat Pumps distributor. To find a distributor near you, click here and you will be routed to our distributor search page.
Our 21 oz. bottles of oil are also available at Home Depot and Northern Tool stores in the pressure washer section.
Why is the crankcase oil milky or thicker and blacker than normal?
If the pump is allowed to run after the low pressure seals and high pressure seals have become worn, water may eventually travel back along the plunger rod and past the barrier slinger. Water is a contaminant to the crankcase oil and will cause the oil viscosity to increase resulting in a loss of lubricity and may oxidize crankcase components. The water will cause the oil color to change to a milky consistency initially and in severe situations will turn the oil to a black tar-like consistency. This lack of lubrication over time may result in damage to the drive -end components or complete drive-end failure. Remember to replace the plunger retainer O-ring each time the seals are replaced. The plunger retainer O-rings are supplied in the seal kit for the pump.
Note: Plunger rod oil seals are not supplied in a standard seal kit. Change the plunger rod seals only when the rods show signs of scoring.
To monitor migration of water from the pump manifold past the low pressure seals, a LPS Monitor can be installed.
If the oil has water in it (i.e. milky, or black), do you need to change the plunger rod oil seals?
Plunger rod oil seals are not supplied in a standard seal kit and aren't typically serviced, unless the pump is leaking oil. However, if you see evidence of the oil looking milky or black, this is an indication of water leaking past the low pressure seals and then past the plunger rod oil seals. Inspect the plunger rods for scoring. If scoring is evident, it may require pump replacement as it may be cost prohibitive to re-build the drive. If scoring isn't present, you will need to install a seal kit inside the manifold of the pump.
How often should my crankcase oil be changed?
For standard piston and plunger pumps, oil should be changed after the first 50 hours and every 500 hours thereafter.
The amount of crankcase oil required will vary based on the capacity of the crankcase. The amount of crankcase oil for each pump model is indicated on the pumps data sheet.
How do you drain the crankcase oil and verify the oil level?
Each pump model is equipped with a crankcase drain plug near the bottom, back side of the blue crankcase.
Oil level can be verified on most pumps with the built-in bubble gauge; the red dot is the minimum fill level. Some pumps are also supplied with a dipstick. Oil level verification should be done with the pump positioned on a level or flat surface and not turning.
Note: overfilling the oil can cause oil spilling from the oil fill cap. Not filling to the minimum indicated oil level could cause drive-end failure due to inadequate lubrication.
Remote oil level indicator kits are available for convenient monitoring when the bubble gauge is not easily visible. Click here for more information.
Why is oil shooting out of the oil cap?
The oil cap is not pressurized but it is vented to relieve normal pressures in the crankcase due to operating temperature changes. Oil coming from the vent hole can be caused by:
- Crankcase overfilling
- Frothing caused by using incorrect, or contaminated oil
- Pump running at higher than rated RPM
- Loose oil cap
- Damaged oil cap O-ring
- Pump installed on an unlevel surface
- Damaged oil cap (i.e., deformed due to high heat)
What is the normal crankcase temperature?
The typical crankcase temperature of a Cat Pump is around 120-140F. Some of the higher RPM [1725-3450 RPM] models may run in the 150-180F range. If the temperature of your crankcase seems unusually warm, it may be due to a low oil level or contamination of your oil. Change the crankcase oil immediately with the specified amount shown in the pump Data Sheet using the Cat Pumps oil. Then observe the temperature after a few hours of operation. If the temperature still seems unusually warm, it could be due worn bearings or a rough crankshaft. Contact your local service center for drive-end servicing.
What oil do I put in the three small holes at the top of the pump?
Most pumps are equipped with lubrication holes at the top of the crankcase or top of the inlet manifold. These holes are for lubricating the seals which extend the performance life of the pump seals. In normal water conditions, lubrication is not required.
In certain applications (i.e., high temperature, low lubricity and dusty environments) extra lubrication is recommended. This maintenance can be done manually or automatically with oilers. Cat Pumps crankcase oil is recommended. For additional information reference Technical Bulletin 024.
How often should I service my pump?
For standard piston and plunger pumps, oil should be changed after the first 50 hours and every 500 hours thereafter.
Seal life will vary based on a number of factors including duty cycle, liquid characteristics (i.e., pH, temperature, lubricity, reclaim), design of system, by-pass conditions, and maintenance cycles. Its not unusual for our seals to perform 3-4 times longer than our leading competitors due to our proprietary designs and materials. 1500 hours or more is a typical seal kit service interval.
Valve kits are typically serviced about every 3000 hours, or every other seal kit change.
Refer to the below document for more information.
What other seal options are available for your pumps?
Below are seal options for modifying our standard pumps which are built with Buna seals. Special seal configurations are ordered using a suffix after the base pump model number (i.e., 1050.0110). Regarding Silicone Seals: Low and high pressure seals, and crankcase oil seals are available silicone free. However, some parts will have small traces of silicone (less than 1%).
- FPM - Fluorocarbon (Viton®) seals and O-rings.0110
- Fluorocarbon (Viton®) seals only.0100
- PTFE - Pure Polytetrafluoroethylene (Teflon®) seals and Buna O-rings.0700
- Pure Polytetrafluoroethylene (Teflon®) seals, and FPM O-rings.0710
- IPFE - Pure Polytetrafluoroethylene seals (Teflon®), and Isolast O-rings.0770
- EPDM - Ethylene Propylene Diene Monamer seals and O-rings.0220
- NBRS - Buna-N silicone free seals and O-rings.6000
- STHT - Special Teflon® high temperature low and high pressure seals.3400
- HT - High temperature seal for plunger pump high pressure seals.3000
- High temperature V-HOT cup for piston pumps
- BNG - Blue-dot (non-greased) Buna-N seals with wicks for piston pumps.0300
- ST4 - Special Teflon® high temperature low and high pressure seals with FPM O-rings for 240°F operation..4410
Note: Teflon® and Viton® are registered trademarks of DuPont Dow Elastomers.
What causes ceramic plunger cracking?
Plunger damage can be caused by a number factors outlined below.
- Loose plunger retainer: The retainer can loosen if improperly torque causing the retainer to become lodged between the plunger end cracking the plunger.
- Improper manifold installation: Insufficient support of the manifold when installing the manifold can cause the ceramic plungers to crack. Too much weight on the plungers or misalignment of the manifold can cause a circular crack around the plungers. The plunger will feel rough to the touch. If this happens, the pump may leak upon start up.
- Thermal shock: Running the pump dry will cause the plungers to become heated. The cold liquid then will cause the plungers to crack due to thermal shock. Avoid run dry conditions or high/low temperature changes. Verify pump inlet conditions, supply tank sizing and properly sized bypass to avoid run dry conditions.
- Maintenance: Over time the plunger retainer O-ring will allow water to leak under the plunger. Excessive leaking may cause the plungers to crack. They will appear as long cracks along the length of the plunger. Service more frequently to avoid this condition. Dropping the ceramic during service can also cause cracking of the plungers.
Where are the inlet and outlet ports on Cat Pumps?
Inlet ports on our pumps are larger than outlet ports. Standard plunger pumps have two inlet ports on the bottom of the manifold and two outlet ports on the top of the manifold allowing installation flexibility for connecting the inlet and outlet hoses.
Piston pumps have one inlet port located at the bottom of the inlet manifold and two/three outlet ports. Some models have two outlet ports and other models have three.
How do I remove a stuck seal case from the manifold?
Soap and hard water build-up on the plunger pump seal case threads can make it difficult to remove from the manifold. A special socket drive tool are available from your local Cat Pumps distributor (pn-33004 5 frame pumps, pn-33005 7 frame pumps, except models 45 and 70, pn-33006 15 frame pumps). Using a substitute tool may cause damage to the seal case or manifold threads. See Accessories Catalog Service in the Tools section at the link below.
Note: CP plunger pumps use a press-in style seal case not requiring the special socket drive tool.
Typically, how long will my seals last?
Seal life will vary based on a number of factors including duty cycle, liquid characteristics (i.e., pH, temperature, lubricity, reclaim), design of system, by-pass conditions, and maintenance cycles. Its not unusual for our seals to perform 3-4 times longer than our leading competitors due to our proprietary designs and materials. Refer to the attached document for more information.
Why are tab washers used on the connecting rods of my pump?
Tab washers are used on all 25, 28, 35, 38, 60 and 68 frame pumps. The washer is a safety feature to assure the connecting rod nuts dont loosen during operation. Be sure to consult the service manual for your pump for the required torque specifications and repair procedure.
What does manifold "wash-out" mean and what does it look like?
Wash-out is the erosion (i.e., pitting, scoring) of the manifold typically around sealing surfaces (i.e., low and high pressure seals, valve seat, and seal case) caused by local water quality (i.e., high pH, hard water, sea water), chemicals being supplied through the pump, or lack of timely maintenance to the seals.
The erosion can cause loss of outlet pressure and leak externally. Replacement of the manifold and seals is recommended if wash-out conditions are evident.
To minimize wash-out, flush the manifold with fresh water when the pump is not used and confirm the chemical compatibility of your pump manifold and seals to any chemicals you are currently supplying through the pump.
Cat Pumps also offers manifolds made of a washout resistant material. For more information, click the link below:
How do I identify my pump when the model information label is missing?
Removal of the pump manifold and measurement of plungers, or cylinders (piston pumps) may be required for complete identification. A stamp number on the end of the crankshaft will be required too. For detailed information on how to identify your pump when the model label is missing, refer to the Pump Identification Reference Bulletin at the link below.
The pump model can sometimes be identified just by sight by one of our Technical Support specialists. Emailing us some pictures of the pump may help point you in the right direction. Contact firstname.lastname@example.org.
How do I interpret the serial number on my pump?
The serial number defines the month/year of production and the production count number. The information is stamped on the crankcase near the mounting feet. Note: Serial numbers on SF models are on a label located on flange the pump.
Months are noted with a number for January thru September (i.e., January (1), February (2), etc) and by letter from October thru December (O, N, and D).
- Example #1: Serial # N010101 means the pump was built in November, 2001 (N01) and it was the 101st (0101) pump produced.
- Example #2: Serial #2020253 means the pump was built in February, 2002 (202) and the 253rd (0253) pump produced.
What does the "C" and "K" in my pump model number mean?
Some pumps are equipped with a special flush-style manifold allowing a flushing liquid to circulate between the high pressure and low pressure seals extending seal life. These pumps use the C and K suffix at the end of the model number to identify the flush-style manifold (i.e., 311C, 781K).
For more information on flush-style manifolds view our Flush-Style Design Guide at the link below:
What does the "S" stamped in my pump manifold mean?
The "S" means the manifold is designed with stainless steel inserts in the seal and valve chambers and are used on 310S, 340S, and 350S. These inserts are designed to extend pump life in those applications where wash-out is an ongoing problem. The manifold has a limited life time warranty.
What does the "W" stamped in my pump manifold mean?
The "W" means the manifolds were made from a special alloy metal (W770) and are used on 310W (obsolete) and 5CP models only. These manifolds were designed to extend pump life in applications where wash-out is an ongoing problem. The manifold has a limited life time warranty.
What does the "B" stamped in my pump manifold mean?
The "B" means the manifolds were made from a special brass alloy and are used on 310B, 340B, 350B, 5CP2120B, 5CP2140B and 5CP2150B. These manifolds were designed to extend pump life in applications where wash-out is an ongoing problem. The manifold has a limited life time warranty.
Can I rotate my pressure washer pump 180 degrees?
Many pressure washer OEMs will rotate our pumps so the manifold is on the opposite side from standard to better suit the design of the the rest of the equipment.
Direct drive, hollow shaft pumps can be rotated 180 degrees on the drive shaft. The red oil cap and black oil plug will need to be switched so that the red oil cap is on the top of the blue crankcase. We also recommend that the oil level be filled slightly above the red dot on the sight glass for this configuration to help ensure proper drive end lubrication.
Can I mount my pump in a vertical position?
Mounting the pump in a vertical position is not recommended. The crankcase plunger rod oil seals, plunger rods and crosshead areas may not get proper lubrication causing decreased pump life.
How do I store and winterize my pump?
It is important to protect your pump and system when storing for an extended period of time. Extreme temperatures and moisture can significantly affect your pump and system. Pump seals, O-rings and crankcase oil can be compromised with prolonged storing even in the best of conditions. Electric motors and belts can also be affected.
When storing your pump in cold climates, drain the pump of liquid and flush the pump with a 50% water and 50% antifreeze mix. Using a short hose (about 4ft in length), flush the pump until the antifreeze mixture flows out the discharge. Shut the unit off (do not install plugs in the inlet and discharge ports) and cover the pump to protect it from the elements. For further information on Winterizing your pump, read the Extended Storing Guidelines document at the link below.
What pulleys, hubs and belts do I need for my pump?
To determine the pulleys and hubs for your application you will need to know the distance from the centerline of the pump crankshaft to the centerline of the power source (i.e., motor, gas/diesel engine) drive shaft (centerline distance). With the centerline distance known, refer to Technical Bulletin 003 for the pulleys, hubs, and belt required.
What is the minimum operating RPM for your pumps?
A minimum of at least 100 RPM must be maintained during operation for all Cat Pumps. This ensures the drive end components are properly lubricated.
When running at less than 400-500 RPM, fill the crankcase above the red dot on the sight glass to promote increased lubrication during operation.
What viscosity fluids can Cat Pumps handle?
Cat Pumps operate best with liquids up to 500CPS or 2500SSU. Some liquids change in nature by heat, velocity as it moves through the pump, exposure to atmosphere or blending with other liquids. Some liquids require a flush prior to any dormant cycles to prevent set-up or pump contamination.
What drive methods are available to drive my pump?
Pumps can be driven using electric motors, gas/diesel engine, hydraulic motors and air motors. These power sources can be connected to the pump using the following drives:
- Belt driven with pulleys/hubs and keys
- Belt driven with clutches
- Solid shaft bell housing with flexible coupler
- Solid shaft with coupler to hydraulic motor
- Hollow shaft direct coupled
- Gear box to engine
Can I feed the pump from both inlet ports?
Feeding both inlet ports in gravity feed applications is acceptable where a single line is inadequate to deliver the proper amount of liquid needed for pump priming.
Pressure feeding the pump through both inlet ports is not recommended. This would cause turbulent flow at the inlet causing premature wear of the pump valves and springs.
Is there a way to minimize crevice corrosion in the pump?
Liquid gasket (6124) is used to minimize corrosion inside the pump in aggressive liquid applications (i.e., car wash, salt water reverse osmosis, leachate, salt water re-injection). It is a flexible sealant that fills the crevices between mating surfaces. See Accessories Catalog, in the Lubrication Accessories section at the link below.
Can I use multiple pumps for higher flow requirements?
Multiple pumps can be used to attain a large flow rate. Each pump should be supplied by its own power source (i.e., motor or engine). The outlet flow is typically delivered to a common header with a single regulator rated for the cumulative flow from all pumps.
What is the right pressure and flow for my application?
We supply pumps for many different applications. We recommend you review your application requirements with others from your industry with similar requirements. If additional assistance is needed, contact us directly at email@example.com.
Can your pumps run dry?
Use of some high temperature seals (.3400) will allow run dry operation for short periods of time. Pumps are not intended to be run dry (without liquid) as this will shorten seal life.
Please consult with a Cat Pumps Technical Support Specialist for assistance in selecting the appropriate seal configuration for your pump and application.
What is the shelf life of your pumps?
Shelf life is 5 years. The time duration is based on seal and O-ring integrity with fluctuations in temperature and humidity. If a pump has been stored for a long time, turn the crankshaft by hand and check for smooth operation. If the pump seems tight or sticks, replace all seals and O-rings before operation.
Can each gun in a multi-gun system operate at a different flow and pressure?
All guns in a multi-gun system will operate at the same pressure. The regulating device in the system (unloader or regulator) can only be set to one pressure for the system. By using different nozzle sizes, different flow rates may be acheived. If independent pressure for each gun is required, a separate pump will be needed for each gun in the system.
What are the important instructions, safeguards, and precautions before operating or servicing your pumps?
Review Cautions and Warnings on each pump data sheet for information for the safe operation and servicing of the equipment. Failure to do so may result in property damage, personal injury or death.
What size supply tank do I need?
When a gravity-fed tank is used, Cat Pumps recommends the reservoir capacity should be 6-10 times the rated flow of the pump (e.g.: 5 GPM pump should have 30-50 gallon reservoir).
Please review the Typical Reservoir Tank Reference Bulletin below and the High-Pressure System Design Guide in the Inlet Design section for more information.