Giant Pumps

Find the Right Giant High-Pressure Pump for Your Application

Essential Specifications You Need to Know

When choosing the right pump, a good starting point is understanding the most important specifications of a Giant pump. Pay close attention to this information when reading product details. Understanding them will help you choose a pump that offers the performance you need for your application that is compatible with your other equipment.

• PSI - This is the maximum pressure that the pump will produce and the power of the resulting fluid spray. Measured in pounds per square inch.
  
• GPM - This spec designates the flow rate of the pump, or the volume of water that it can process, measured in gallons per minute.
  
• RPM - The maximum speed that the pump crankshaft can turn to operate safely and efficiently. Knowing this allows you to determine the compatibility of the motor or engine that's driving the shaft. Measured in rotations per minute.
  
• Maximum Temperature - This relates to the temperature of the fluid moving through the pump. Exceeding this maximum recommendation can cause damage and quick degradation of seals and wear parts.

Other Relevant Specifications

• Inlet and Outlet Port Size
• Horsepower
• Crankshaft Diameter
• Key Width
• Stroke
• Maximum Inlet Pressure
• Crankcase Oil Capacity
• Plunger Diameter

Understand Giant Pump Series and Common Applications

Giant triplex plunger pumps are ideal for car washing and pressure washing. Most of their pumps can be configured for belt or direct drive, gas or electric flange, and left or right shaft orientation. Read some brief descriptions of their most popular lines and individual pumps, then consult our lists to figure out what will work best for your application.

P200 and P300 Series

USA-made triplex plunger positive displacement pumps with reciprocating plungers. Options available for gas, electric, diesel, or hydraulic drive. Direct or belt drive applications. These pumps are made for medium-duty applications but are often used for 10-12 hours on a continuous basis. P200 are available with 2000 or 2500 maximum pressure and .73-4.7 GPM flow rate options. P300 models range from 1000 to 3685 PSI and 2.9 to 6.5 GPM. Both are great for self-serve car wash and pressure wash applications. They are also commonly used for pressure washing, misting/fogging, sewer jetting, dust suppression, odor control, fire suppression, and liquid CO2.

Features

• Aluminum crankcase with sight glass and vented dipstick
• Forged, through-hardened, ground and polished crankshaft
• Bronze connecting rods
• Hardened stainless steel plunger bases
• Solid ceramic plungers
• Nitrile seals (with fabric reinforcement)
• Stainless steel valves
• Forged brass manifold

P56W and P59W Pump Models

German-made reciprocating triplex plunger pumps with options for gas, electric, diesel, or hydraulic drive. Both models have a maximum pressure of 1900 PSI. The P56W has a maximum flow rate of 6.1 GPM and the P59W has a maximum of 7.5 GPM. These medium duty, continuous use pumps are excellent for self-serve car wash applications and prep gun stations. They compare well to a CAT 310 pump. They're also used for pressure washing, boiler feed, carpet cleaning, sewer cleaning, desalination, and other industrial applications.

Features

• Aluminum crankcase with sight glass and vented dipstick
  
• Forged, through-hardened, ground and polished crankshaft
• Bronze connecting rods
• Hardened stainless steel plunger bases
• Solid ceramic plungers
• Nitrile seals with fabric reinforcement
• Stainless steel valves
• Forged brass manifold

LP122A and LP123 Pump Models

These are German-made reciprocating triplex plunger pumps. Both offer a maximum pressure of 1300 PSI and a maximum flow rate of 35.4 GPM. These are essentially the same pump, but the LP123 has a brass manifold while the LP122A has an aluminum bronze manifold that works well with reclaim water. These heavy-duty pumps are designed for continuous use and are ideal for touchless car wash applications. LP pumps are also used for steel processing, water hydraulics, fire suppression, boiler feed, descaling, sewer jetting, wastewater re-injection, jetting, deburring and other industrial applications.

Features

• Spheroidal cast iron crankcase with sight glass and vented dipstick
• Forged, through-hardened, ground and polished crankshaft
• Bronze connecting rods
• Hardened stainless steel plunger bases
• Solid ceramic plungers
• Nitrile seals with fabric reinforcement
• Stainless steel valves
• Brass manifold (LP123) or cast aluminum bronze manifold (LP122A)

GX Series

The GX Series includes axial design positive displacement triplex plunger pumps for direct drive only. Designed primarily for light duty, these pumps are compact and easy to maintain, making them superb for pressure washers, small shops, and low volume car wash applications. The GXH2525-111H with a 3/4" shaft and the GXH2525A-112H with a 7/8" shaft are two of the most popular models from this line. Made in the U.S.A.

Features

• Aluminum crankcase
• Machined wobble plates
• Stainless steel thrust bearings
• Stainless steel plungers
• Nitrile seals (with fabric reinforcement)
• Delrin valves
• Forged brass manifold
• Integrated unloader
• Thermal relief valve
• Optional fixed or adjustable chemical injector

Best Giant Pump Series for Car Washes

• P56
• P59
• LP
• P200
• P300
• P400
• P500

Best Giant Pump Series for Pressure Washers

• GX
• P200
• P300
• P55
• P58

Choose a Trusted Giant Pumps Distributor

Kleen-Rite has worked closely with Giant Pumps for nearly as long as the company has been around. Giant is a stalwart in the car wash industry, and Kleen-Rite is proud to be an authorized distributor for Giant pumps, parts, and accessories. Anything on our site that is Giant branded is a genuine pump or OEM part - no copies, reproductions, or unauthorized products. We offer a huge selection of Giant items that has grown significantly and is unmatched in the car wash industry. You can trust that Giant will back up these products with technical advice, customer service, and warranties.

You'll notice that we use official Giant logos, include manuals and documentation straight from the brand, and always make sure it's clear that we work directly with Giant to source their products. These are all important things you should look for to determine if you're buying from an authorized distributor.

Why Buy from an Authorized Source?

The benefits of buying from an authorized source are significant. To start, you can be sure that the pump you're buying has been designed, engineered, and inspected by Giant. The quality and performance will always meet the standards of the brand. All available manufacturer warranties will be honored when buying from a recognized distributor like Kleen-Rite, which may not be true if you get your pump through an unauthorized source. After purchasing, you can feel confident that both Kleen-Rite and Giant will assist you with any service issues you may encounter. Working with an authorized seller also means that you can return to that reliable source to find OEM repair parts that are in stock and ship quickly. Kleen-Rite and Giant work hand-in-hand to ensure customer satisfaction from the initial pump purchase, during installation, and throughout the use of the pump.

Product Benefits and Core Features at a Glance

Giant pumps feature several key features that set them apart from the competition. Below are three of the most important attributes of these pumps, along with the benefits that they provide.

Forged Manifolds - Like a lot of industrial equipment, pump manifolds are usually made with either forged or die-cast metal. Forging involves shaping metal that, while often heated to a high temperature, remains a solid through the shaping process. This produces components with a higher density and strength with less porosity and cavity defects. Die-casting, on the other hand, involves a process of heating metal until its molten and poured into a die. Die-cast metal is weaker and more prone to damage. Giant uses only forged manifolds on their pumps, increasing their overall strength and toughness. Giant manifolds are typically made of brass, although some are nickel-plated spheroidal iron or 316 stainless steel - all quality metals. Unlike some lower quality pumps that have a manifold with two pieces bolted together, Giant uses 1-piece solid manifolds. This helps avoid washout and damage.

Bronze Connecting Rods - The connecting rods in a plunger pump are the mechanical link between the crankshaft and the plungers, basically transferring the force from the reciprocating shaft into a back-and-forth motion of the plunger. As such, connecting rods are under a lot of stress and should be as strong as possible. Giant pumps have brass connecting rods that are incredibly durable, long-lasting, and have excellent lubrication properties. While many pump manufacturers use Zamak or aluminum for their connecting rods, Giant uses significantly stronger brass metal.

Solid Ceramic Plungers - For plungers in the pumps used for car washes and pressure washing, ceramic is the ideal option. Compared to inferior options like stainless steel or carbon steel, is highly resistant to wear. That means it's durable and long lasting. Plus, less degradation means fewer contaminants are introduced into the water or chemical solution being pumped. Ceramic holds up well to abrasive and corrosive chemicals, as well as high temperatures. These are obvious benefits in challenging cleaning environments.

Installation Instructions

In most cases, installation of a Giant pump is not an overly complicated procedure, but there are some basic steps common to all pumps. The instructions below should be considered as a general outline for installation. If you have unique requirements, or have never installed a high-pressure pump before, consider reaching out directly to Giant Industries, Inc. or a local service technician for assistance. For detailed information and specific requirements, always consult your manual during installation and maintenance.

1. The pump should be installed flat on a base to a maximum of a 15-degree angle of inclination to ensure optimum lubrication.
2. The inlet to the pump should be sized for the flow rate of the pump with no unnecessary restrictions that can cause cavitation. Teflon tape should be used to seal all joints. Maximum inlet fluid temperature is 80° F.
3. The discharge plumbing from the pump should be properly sized to the flow rate to prevent line pressure loss to the work area. It is essential to provide a safety bypass valve between the pump and the work area to protect the pump from pressure spikes in the event of a blockage or the use of a shut-off gun.
4. Before beginning operation of your pumping system, remember: Check that the crankcase and seal areas have been properly lubricated per recommended schedules. Do not run the pump dry for extended periods of time. Cavitation will result in severe damage. Always remember to check that all plumbing valves are open and that pumped media can flow freely to the inlet of the pump.

Important Operating Conditions

After installation and during operation, keep these important notes in mind. Failure to comply with any of these conditions may affect the performance of your pump and invalidate the warranty.

1. Prior to initial operation, check for proper oil level. DO NOT OVERFILL. Be sure to use Giant 20W-50 non-detergent motor oil (Giant part 01153; KR part PU01153). Crankcase oil should be changed after the first 50 hours of operation, then at regular intervals of 200 hours or less depending on operating conditions. Since it is difficult to determine the oil level in the pump, check for signs of oil leakage around the pump before and during operation. The best areas to check are between the manifold and the crankcase and between the adapting plate and the engine / motor mounting surface. Lastly, you can see if there is any leakage around the vent cap (on the top of the pump). If everything looks okay, continue to use the pump. At least once per year (or every 200 hours), remove the oil from the pump and replace with the required amount of oil.
2. Pump operation must not exceed rated pressure, volume, or RPM. A pressure relief device must be installed in the discharge of the system.
3. Acids, alkalines, or abrasive fluids cannot be pumped unless approval in writing is obtained before operation from Giant Industries, Inc.
4. Run the pump dry approximately 10 seconds to drain the water before exposure to freezing temperatures.

Pump System Malfunction Troubleshooting

If your pump is failing or not functioning to desired performance levels, check some of the troubleshooting tips below to address most issues.

Pressure or Delivery Drops

Potential Causes

• Worn packing seals
• Broken valve spring
• Belt slippage
• Worn or damaged nozzle
• Fouled discharge
• Fouled inlet strainer
• Worn or damaged hose
• Worn or plugged relief valve on pump
• Cavitation
• Unloader failing

Remedies

• Replace packing seals
• Replace valve spring
• Tighten or replace belt
• Replace nozzle
• Clean valve assembly
• Clean strainer
• Repair or replace hose
• Clean, reset, and replace worn parts
• Check suction lines on inlet for restrictions
• Check for proper unloader operation

Water in Crankcase

Potential Causes

• High humidity
• Worn seals
• Remedies
• Reduce oil change interval
• Replace seals
• Noisy Operation
• Potential Causes
• Worn bearings
• Cavitation

Remedies

• Replace bearings
• Refill crankcase with recommended lubricant
• Check inlet lines for restrictions and/or proper sizing

Rough or Pulsating Operation with Pressure Drop

Potential Causes

• Worn packing
• Inlet restriction
• Accumulator pressure issue
• Unloader failing
• Cavitation

Remedies

• Replace packing
• Check system for stoppage, air leaks, or incorrectly sized inlet plumbing to pump
• Recharge or replace accumulator
• Check for proper unloader operation
• Check inlet lines for restrictions and/or proper size

Pressure Drop at Gun

Potential Cause

• Restricted discharge plumbing

Remedy

• Resize discharge plumbing to flow rate of pump

Excessive Leakage

Potential Causes

• Worn plungers
• Worn packing/seals
• Excessive vacuum
• Cracked plungers
• Inlet pressure too high

Remedies

• Replace plungers
• Adjust or replace packing seals
• Reduce suction vacuum
• Replace plungers
• Reduce inlet pressure

High Crankcase Temperature

Potential Causes

• Wrong grade of oil
• Improper amount of oil in crankcase

Remedies

• Make sure you're using recommended Giant 20W-50 non-detergent motor oil
• Adjust oil level to proper amount

Quick Start and Maintenance Checklist

• Unpack the pump and all included components, ensuring nothing is missing or damaged before beginning installation. Confirm the model number, pressure rating, and flow rate on the nameplate match your system’s requirements.
• Mount the pump securely and levelly as directed in the manual. Use the correct fittings and apply Teflon tape for leak-free plumbing connections, taking care to correctly size both inlet and discharge lines to the specified GPM.
• Fill the crankcase with Giant 20W-50 non-detergent motor oil to the manufacturer’s required level. Rotate the pump shaft by hand several times to distribute lubricant and verify operability before connecting to power.
• After initial installation, inspect all seals, hoses, and connections for leaks or abnormal wear during startup.
• Run the pump for a brief period, while monitoring for abnormal noise, pulsation, or temperature increase.
• Confirm that all safety devices—like bypass and relief valves—are installed and working. Perform a check for proper discharge pressure using a calibrated gauge.
• For ongoing maintenance, adhere to an oil change schedule: first after 50 hours of use, then every 200 hours or less depending on conditions.
• Routinely inspect seals, plungers, and packings for visible wear or leaks and replace as necessary. Clean inlet strainers and check for blockages or build-up that could limit flow. Always keep a record of service and replaced parts to help with warranty support and troubleshooting.
• Lastly, prior to freezing conditions, make sure to drain all water from the pump and lines to prevent freeze damage. Following these steps ensures that your Giant high-pressure pump delivers reliable service and maximum performance for your car wash or industrial application.

Avoid Common Brand Confusion: Giant vs. Little Giant Pumps

As you're shopping for pumps, you may notice that Giant and Little Giant are available on the market. It's important to understand that the two are separate entities and not affiliated in any way. Little Giant is owned by the Franklin Electric company. Although both are pump manufacturers, they offer pumps for different applications. Giant focuses on durable, high-pressure pumps for robust water transfer, while Little Giant makes low to mid-pressure utility and submersible pumps for things like HVAC, sewage, sump, pool, water garden, and well applications. While there may be special instances when a Little Giant pump could be used at a car wash, Giant is the brand you'd want to explore for high-pressure rinsing and cleaning in your car wash bays.

You may also come across the Giantz pump brand, which is also not affiliated with Giant. These water pumps are most commonly used in garden and irrigation applications. They are not typically used in car wash systems.

Buy with Confidence

With inventory in stock, fast shipping times, secure transactions, and the knowledge that both Kleen-Rite and Giant will back up your purchase with top notch service, you can feel comfortable every time you add a Giant product to your cart. Make us your reliable supplier!