7 Best PTO Water Pumps for Water Trucks (Researched and Compared)

Choosing the right PTO water pump for your water truck is critical for reliable water transfer, dust control, or irrigation. We researched and compared the top models based on manufacturer specifications, industry standards, and aggregated owner feedback. Our evaluation focuses on flow rate, pressure, build quality, and ease of installation. Here are the best PTO water pumps for water trucks, with honest assessments of their strengths and limitations.

1. Gorman-Rupp 80 Series PTO Centrifugal Pump: Best Overall

🛒  Check Price on Amazon →

In our evaluation, the Gorman-Rupp 80 Series stands out for its robust cast iron construction and proven reliability. Based on owner feedback and the spec sheets, it delivers a consistent 300 GPM at moderate pressure, making it ideal for dust control and firefighting support. The self-priming feature is a significant advantage for operators who need to start the pump without a flooded suction. However, its weight (over 100 pounds) might be a consideration for lighter trucks or those with limited payload capacity.

Who should skip this: If you need a pump for intermittent light-duty use or have a smaller water truck, this model may be overbuilt and heavier than necessary. Consider a lighter aluminum pump instead.

• Cast iron construction with powder-coated finish resists corrosion and wear.
• Self-priming design allows for dry-run capability up to 15 minutes.
• Replaceable wear plate and seal assembly simplify maintenance.

Pros: Excellent build quality and long service life.; High flow rate suitable for large water trucks.
Cons: Heavier than some competitors, may require reinforced mounting.

2. Waterous CM Series PTO Pump: Best for High Pressure

🛒  Check Price on Amazon →

We researched the Waterous CM Series for applications requiring higher pressure, such as hydroseeding or pressure washing. According to manufacturer specifications and owner feedback, the two-stage design reliably delivers up to 150 PSI, which outperforms most single-stage competitors. The bronze impeller and stainless steel shaft provide excellent corrosion resistance, especially for trucks using treated or brackish water. However, the flow rate drops to 250 GPM, which may be insufficient for rapid filling of large tanks.

Who should skip this: If your primary need is high-volume transfer for dust control, a single-stage pump with higher flow would be more efficient. This pump is best for those who prioritize pressure over volume.

• Two-stage centrifugal design achieves higher pressures than single-stage pumps.
• Bronze impeller and stainless steel shaft resist corrosion.
• Compact footprint fits tight engine compartments.

Pros: High pressure output for long-distance water transfer or washing.; Durable materials extend pump life in harsh conditions.
Cons: Lower flow rate compared to some single-stage pumps.

3. Darley HE Series PTO Centrifugal Pump: Best Value

🛒  Check Price on Amazon →

Based on our comparison of value-oriented pumps, the Darley HE Series offers a good balance of performance and affordability. Owner feedback highlights its ease of installation and reliable operation for typical water truck tasks like dust control and irrigation. The aluminum body keeps weight down to around 50 pounds, making it suitable for trucks with limited payload. However, the 200 GPM flow and 80 PSI max pressure may not satisfy demanding users who need high volume or pressure.

Who should skip this: If you frequently fill large tanks or need high pressure, consider investing in a more powerful pump. This is ideal for light to medium duty cycles.

• Aluminum housing reduces weight without sacrificing strength.
• Mechanical seal with ceramic face provides leak-free operation.
• Direct PTO mount eliminates need for additional adapters.

Pros: Lightweight design simplifies installation on smaller trucks.; Competitive price point for budget-conscious buyers.
Cons: Lower flow and pressure limits heavy-duty applications.

4. Ace Pump 2AB-PTO Centrifugal Pump: Compact Design

🛒  Check Price on Amazon →

In our evaluation, the Ace Pump 2AB-PTO is a space-saving solution for smaller water trucks or utility vehicles. Based on owner feedback, it performs reliably for light dust control and tank filling, and the integral PTO shaft simplifies installation. However, the 150 GPM flow and 70 PSI pressure are modest, and the 2-inch ports restrict water movement compared to larger pumps. It is not designed for continuous heavy use.

Who should skip this: If your water truck has a large tank (over 2000 gallons) or you need high flow for firefighting, this pump will be underpowered. It is best for compact trucks with intermittent needs.

• Ultra-compact design fits in tight spaces, ideal for small trucks.
• Cast iron housing with epoxy coating for corrosion resistance.
• Integral PTO shaft eliminates alignment issues.

Pros: Small footprint allows mounting in confined engine bays.; Simple installation with minimal modifications.
Cons: Lower flow and pressure limit use to light-duty applications.

5. MP Pumps FLOMAX 8 PTO Pump: High Flow Specialist

🛒  Check Price on Amazon →

We researched the MP Pumps FLOMAX 8 for high-volume transfer applications. According to the spec sheet, it moves up to 400 GPM, making it one of the fastest pumps for filling or emptying water tanks. Owner feedback confirms its effectiveness for dust control where high flow is needed but pressure is not critical. However, the pump is bulky and heavy (over 150 pounds), and the 50 PSI max pressure is not suitable for spraying or pressure washing.

Who should skip this: If you need pressure above 50 PSI or have a small truck with limited space, this pump is not a good match. It is designed for dedicated high-flow operations.

• High flow rate ideal for rapid filling or emptying large tanks.
• Aluminum bronze impeller resists wear from abrasive water.
• Large 6-inch ports minimize friction loss.

Pros: Exceptional flow capacity for maximum productivity.; Durable impeller handles dirty water well.
Cons: Large and heavy, requires substantial mounting space.; Lower pressure limits use to low-head applications.

6. Hypro D Series PTO Diaphragm Pump: Best for Precision

🛒  Check Price on Amazon →

In our evaluation, the Hypro D Series is a niche choice for water trucks that double as sprayers for weed control or dust suppressants. Based on owner feedback, the diaphragm pump delivers consistent pressure up to 200 PSI, perfect for spray nozzles. However, the flow rate is only 30 GPM, which is far too low for filling tanks or firefighting. The pump also requires more frequent maintenance than centrifugal pumps.

Who should skip this: If your primary need is moving large volumes of water, look elsewhere. This pump is only for operators who need high pressure and low flow for spraying.

• Diaphragm design allows dry running and handles abrasives.
• High pressure output for precise spraying applications.
• Self-priming up to 10 feet vertical lift.

Pros: Excellent for chemical injection or precision spraying.; Can run dry without damage, unlike centrifugal pumps.
Cons: Low flow rate makes it unsuitable for bulk water transfer.; Higher maintenance due to diaphragm and valve replacement.

7. Barnes PTO Series 4CC Centrifugal Pump: Budget Pick

🛒  Check Price on Amazon →

We researched the Barnes PTO Series 4CC as an entry-level option. Based on owner feedback, it performs adequately for occasional light-duty use such as watering gravel roads. The price is attractive, but some owners report seal failures after a season of heavy use. The pump lacks self-priming capability, which can be inconvenient if the suction line is not flooded. It is best suited for trucks that already have a flooded suction setup.

Who should skip this: If you need a pump for daily heavy use or self-priming capability, invest in a higher-quality model. This pump is for intermittent, budget-conscious applications.

• Economical cast iron pump for basic water transfer needs.
• Replaceable mechanical seal extends service life.
• Simple bolt-on PTO mount fits many standard trucks.

Pros: Lowest cost option for budget-limited buyers.; Adequate performance for light dust control.
Cons: Mixed owner feedback on long-term durability.; Not self-priming; requires flooded suction or priming aid.

Frequently Asked Questions

How do I choose the right PTO water pump for my water truck?

Consider your primary application: high-volume transfer (dust control) needs a centrifugal pump with high GPM, while spraying requires high pressure. Also check your truck’s PTO horsepower and RPM to ensure compatibility. Measure available mounting space and consider weight limits.

What is the difference between a centrifugal and diaphragm PTO pump?

Centrifugal pumps are best for high flow at lower pressure and are simpler with fewer moving parts. Diaphragm pumps provide high pressure at low flow, can run dry, and handle abrasives better, but require more maintenance.

Can I install a PTO water pump myself?

Installation requires mechanical knowledge and proper alignment with the PTO shaft. Many owners hire a professional to avoid driveline vibration and damage. If you have experience with truck PTO systems, you can do it yourself, but follow the manufacturer’s instructions carefully.

What maintenance does a PTO water pump need?

Regularly check and replace the mechanical seal if leaking, lubricate bearings per the manual, and flush the pump after use with dirty water. Inspect the impeller and wear plate for wear. Diaphragm pumps need periodic diaphragm and valve replacement.

How do I match the pump to my truck's PTO?

Check your truck’s PTO output horsepower and RPM at the pump speed. The pump’s required horsepower at its operating point must be less than the PTO’s capacity. Also ensure the PTO shaft rotation direction matches the pump’s rotation (usually clockwise).

Our Verdict

After researching and comparing these PTO water pumps, our top pick is the Gorman-Rupp 80 Series for its robust build, reliable performance, and owner satisfaction. For those needing high pressure, the Waterous CM Series is an excellent runner up. Consider your specific flow and pressure needs, truck compatibility, and budget when making your choice.