On a farm, the tractor is a source of power that can operate dozens of different machines. One of the most practical uses of a power take-off shaft is to drive a water pump - a device that does not require a separate combustion engine, fuel or electrical power. At our company Dambat, we have been designing and delivering for over two decades tractor pumps IBO brand, which combines simplicity of design with industrial parameters. In this article, we explain how a PTO shaft water pump works, what technical criteria should be taken into account when selecting it, and which model - PRO or PRN - will work well on a farm, orchard, or for flood protection interventions.
What is a water pump for the PTO shaft and how does it work?
A water pump mounted on the tractor's PTO shaft is a design in which mechanical energy from the tractor engine - transferred through the tractor's PTO shaft and the power take-off shaft - drives the centrifugal pump rotor. The standard PTO shaft speed is 540 rpm, but due to the desired efficiency, a gear ratio increasing the rotor speed is necessary. In models PRO i PRN we use a gearbox with a gear ratio of 1:6.67, thanks to which we obtain approximately 3600 rpm at the pump from 540 revolutions of the PTO shaft. This design allows for high flow efficiency without the need to use an additional combustion engine or external electrical power supply.
This type tractor pumps they work where Power supply electric power is unavailable or insufficient, and the user already has a tractor with a power range of 15–125 HP. This solution is particularly appreciated by fruit growers, breeders and volunteer fire brigades who need a mobile source of high efficiency without the need to invest in combustion pump units. PTO pumps they also do not require separate registration or operator licenses beyond those held by every farmer driving a tractor. Liquid pumps on PTO - as this category is technically called - they transport water, slurry and other liquids at relatively low pressure, but with high volumetric efficiency.
Liquid pumps on PTO it is most often used to irrigate arable fields, orchards, berry plantations and forest nurseries, for drainage of basements, flooded rooms and construction excavations, for overflowing retention reservoirs and for flood prevention actions carried out by the Volunteer Fire Department and municipal services. Liquid pumps on PTO they do not require any hydraulic installation of the tractor - all you need is a functional PTO shaft and a three-point suspension system. From a technical point of view liquid pumps on the PTO are centrifugal pumps coupled with a mechanical reducer. Liquid pumps on PTO they can be self-suction (like our PRO model) or normally suction, requiring priming of the pump and suction hose before starting (like PRN). Liquid pumps on PTO it is an economical solution - the purchase cost is low compared to a motor pump with comparable performance, and the operating cost is limited to the fuel consumed by the tractor itself.
It is also worth emphasizing that ours PTO pumps are structures designed for continuous and seasonal operation. PTO pumps from the IBO range have a cast iron body enclosed in a steel frame, which translates into decades of durability while maintaining the maintenance rules.
Tractor pumps from Dambat - PRO and PRN models from IBO
In our IBO brand, we offer two models of tractor pumps that cover the vast majority of agricultural and municipal pumping needs: PRO (for dirty water and slurry) and PRN (for clean water under higher pressure). Both models include professional pumps designed for long, seasonal use in field conditions. Professional pumps tractors require a solid structure, which is why both PRO and PRN are mounted on powder-coated steel frames with a three-point suspension system compatible with the standard three-point linkage of agricultural tractors.
Tractor pump PRO — versatility and resilience
Model PRO is a single-stage, self-priming centrifugal pump with an abrasion-resistant impeller. The self-suction design is a key advantage when working in the field - it is enough to prime the pump chamber itself, and subsequent starts take place without the need to prime the suction hose. PRO is our proposition for users who need a universal tool: from irrigation, through drainage, to transferring slurry.
Key technical parameters of the PRO model:
- Maximum performance: 1000 l/min
- Lifting height: 30 m water column
- Suction capacity: 7 m (after flooding the chamber)
- Suction/discharge port: 3″/3″
- PTO revolutions / pump revolutions: 540 / 3600 rpm
- PTO shaft: 1⅜″ six-slot (standard)
- Reducer ratio: 1:6.67 (single reduction)
- Required tractor power: 15–125 HP
- Weight: 50 kg
- Gear oil: SAE 90; roller grease: lithium
- Included: power take-off shaft
Water pump application in the case of the PRO model, it includes: pumping dirty water (including slurry), drainage of basements and flooded rooms, irrigation of orchards and crops with low required pressure, fighting the effects of floods and overflowing retention reservoirs. Water pump application will also be found in the farm - emptying waterers, rainwater tanks, technological pools. capacity of 1000 l/min means that a typical 5 m³ tank is emptied in less than 5 minutes - this is pump efficiency, which works well in intervention campaigns. Pump efficiency PRO also provides a margin of power when pumping media denser than pure water, such as diluted slurry - in practice, the real efficiency drops by 15-25%, but still remains at the level of several hundred l/min.
Tractor pump PRN — high pressure for irrigation
Model PRN it is also a single-stage centrifugal pump, but normally suction - which means that the pump and the suction hose must be primed before the first start-up and after each disconnection of the installation. In return, PRN offers a much higher head and operating pressure, making it an ideal choice for pressurized irrigation. Unlike PRO, PRN is intended only for clean water, without solid contaminants - pumping contaminated water will shorten the life of the impeller and mechanical seal.
Key technical parameters of the PRN model:
- Maximum performance: 750 l/min (45 m³/h)
- Lifting height: 70 m water column
- Maximum working pressure: 7 bar
- Suction capacity: 6 m
- Suction/discharge port: 3″/3″
- PTO revolutions / pump revolutions: 540 / 3600 rpm
- PTO shaft: 1⅜″ six-slot
- Reducer ratio: 1:6,67
- Required tractor power: 15–125 HP
- Weight: 65kg
- Included: power take-off shaft
PRN is designed to power irrigation systems requiring higher pressure - orchards, vegetable crops, forest nurseries, berry plantations. It is also suitable for supplying technological hydrants and as a booster pump for "rain gun" type cannon sprinklers with a large nozzle required. The lifting height of 70 m allows pumping uphill in fields with significant elevation gain or across Power supply rain showers with long pipelines. Pump efficiency PRN combined with a pressure of 7 bar gives the power necessary to effectively irrigate an area of over 1 ha at the same time. The pumped water must be clean, without solid contaminants - in practice, this means intakes from wells, retention reservoirs, cleaned ponds or water supply installations.
PRO or PRN – quick comparison
The most common question from our technical department is: which model should I choose? A quick rule of thumb: if you're pumping something other than clean water - choose PRO. If you are pumping clean water and need pressure (e.g. for a sprinkler or overhead irrigation system) - choose PRN. If you need high volume capacity for emergency operations - PRO. If you work in an orchard with a division sprinkler system - PRN.
How to choose a water pump for the tractor PTO - step by step
The selection of a PTO pump requires the analysis of several parameters. We present a simplified selection procedure that we use in our technical department during everyday service of installers and end customers.
1. Determine the type of liquid being pumped
This is the first and key question. If polluted water, slurry, flood water with suspension is pumped - choose the PRO model. If it is clean water from an intake, pond or retention tank without solids - choose the PRN model. Trying to pump dirty water with a PRN pump will shorten the life of the impeller and seals by up to half. Tip for the installer: if the customer cannot precisely determine the purity of the pumped liquid, we always recommend PRO as a safer solution.
2. Calculate the required lifting height
The lifting height is the sum of the geometric height (the difference in the levels of the water surface and the outlet point) and pressure losses in the pipes and fittings. For typical drip irrigation of an orchard with a height of 10 m and 200 m of cable length, the loss may amount to another 5-10 m. The actual efficiency decreases as the lifting height increases, so we recommend using the Q-H characteristic, available in the technical data sheet of each of our models. pump efficiency at the operating point usually differs by 20–30% from the maximum value declared in the catalogue.
3. Check the required capacity
Here it is worth calculating the actual hourly demand. A rotary sprinkler typically consumes 30–120 l/min at a pressure of 4 bar; a drip system with 500 emitters of 4 l/h gives approx. 33 l/min. Pump efficiency PRO at the level of 1000 l/min allows you to power up to 8-10 sprinkler sectors simultaneously, while PRN - with lower flow but higher pressure - is ideal for department sprinklers. For a typical sprinkler with 4 sprinklers of 80 l/min, the operating pressure of 5 bar is the minimum, which PRO will not provide, but PRN will.
4. Verify the tractor's PTO shaft and its parameters
As standard, the tractor's PTO delivers power at standardized revolutions. Tractor PTO shaft is typically 1⅜″ in diameter and has 6 keys - both PRO and PRN conform to this standard. Also check the type of PTO in your tractor - in older models (Ursus C-330, MTZ) the PTO may be dependent on the clutch, in newer models - independent, with the ability to switch speeds. Standard value PTO shaft revolutions for our pumps it is 540 rpm. Some modern tractors also offer 1000 rpm - in this case, set the mode to 540 rpm or use an appropriate intermediate reducer. Exceeding nominal values PTO shaft revolutions leads to excessive heating of the pump reducer and accelerated wear of seals. Setting the PTO speed too low will prevent the rotor from reaching the required speed pump efficiency will fall below the nominal value. Remember that the correct setting PTO shaft revolutions has a direct impact on both the efficiency and life of the reducer.
5. Three-point suspension system and completeness of delivery
Both models are delivered complete with a power take-off shaft. The tractor's three-point linkage must be operational and the pins of category I or II must comply with the ISO 730 standard. After connecting the pump, we recommend supporting the PTO shaft to avoid its operation at an angle greater than 25° - this is a standard rule for all PTO pumps. Working at a greater angle accelerates the wear of the shaft crosses and may lead to vibrations that worsen the flow parameters and cause play in the pump bearings.
Operation, installation and work safety
The PTO water pump is a device that is simple in design, but requires following several rules. Omitting them may result in damage to the reducer, rotor or - in extreme cases - an accident involving the operator. The following tips come from our daily service practice.
Preparing for the first launch
Before the first start-up, we always check the oil level in the gearbox (recommended SAE 90) and the lubrication of the PTO shaft with lithium grease. In normal suction models (PRN), we flood the pump and the suction hose with water - without flooding, the pump will not suck in and the mechanical seal may be damaged due to "dry" operation. In self-priming models (PRO), it is enough to first prime the pump chamber itself through the filling plug located on the body. Before each start, we also check the tightness of all suction connections - the slightest leak on the suction side causes the pump to "catch air" and lose efficiency.
Suction hose and check valve basket
We use a reinforced spiral suction hose, with a nominal diameter consistent with the connector (3″ for PRO and PRN). Using a smaller diameter hose is one of the most common installation mistakes - it increases suction resistance and may lead to cavitation. The suction nozzle should be equipped with a basket with a non-return valve (foot valve) - this keeps the pump primed after stopping and prevents cavitation on restarting. The basket additionally retains solids that could damage the impeller. The discharge hose can be a W-75 fire hose or a PVC spiral hose, depending on the working pressure - PRN up to 7 bar requires a hose of a higher pressure class (minimum 10 bar to maintain a safety margin).
Safe work with PTO
The power take-off shaft must always have a functional cover. This is a statutory requirement and at the same time the most important occupational health and safety rule on the farm. Never approach a rotating PTO with loose clothing, long hair or tools in hand. The PTO is turned on and off at low tractor engine speeds - sudden engagement at full speed causes a mechanical shock in the pump reducer and may damage the gears in the gearbox. After each season, we recommend checking the roller cover for cracks and the completeness of the chains that prevent the cover from rotating with the shaft.
Maintenance during the season
Every few dozen hours of operation, we check the oil level in the reducer and lubricate the PTO shaft. After longer breaks in work (over a week) - before starting again, we always manually rotate the pump shaft to check whether anything is seized. In the PRO model pumping slurry, we recommend rinsing the pump with clean water after each day of operation - this extends the life of the mechanical seal and prevents deposits from accumulating in the pump chamber.
Accessories and equipment for a tractor pump
The pump itself is only part of the system. Pumps for agricultural machinery require sensibly selected equipment that determines the comfort and safety of work. Pumps for agricultural machinery Our offer can be completed with full accessories available in the Dambat catalogue. Below is a brief description of what is worth having in the set for the PRO or PRN pump.
- 3″ reinforced spiral suction hose — with Storz type quick-connect fittings. The length is adjusted to the actual suction depth plus 1 m of reserve. For PRO, the maximum total suction length is 7 m, for PRN - 6 m.
- Basket with non-return valve (foot valve) — protects against sucking in solids and keeps the pump primed between starts.
- W-75 fire hose or spiral PVC class minimum 10 bar - depending on the pump model and required working pressure.
- Storz type firefighter couplings — standard in Polish agriculture and municipal services, enable quick connection of sections without keys.
- Shut-off and non-return valves — necessary for more complex installations, e.g. with several sprinkler sections.
- Pressure gauges — allow you to monitor the operating pressure and detect early a drop resulting from a clogged suction filter or seal failure.
- Mesh filters — additional protection against contamination in drip installations, where even small particles block the emitters.
- Pressure reducers — useful when the PRN pump works with a drip line with a lower permissible pressure (e.g. 2.5 bar).
You will find the full range of accessories (valves, pressure gauges, filters, hoses, connectors) in our store - all with guaranteed compatibility with IBO pumps.
Applications of tractor pumps in practice
Tractor pumps are characterized by universality, which makes them chosen by both family farms and municipal units. Tractor pumps are also independent from external power supply - they work wherever the tractor goes. Below are some specific applications that we most often encounter in our technical service.
Irrigation of orchards and field crops. PRN with a lifting height of 70 m and a pressure of 7 bar will power sprinkler systems in orchards with an elevation of up to 30-40 m and an area of up to 1-2 ha at the same time. This is a real alternative to permanent electrical installations on farms where the field is far from the power source.
Pumping slurry and overflowing breeding tanks. PRO with an abrasion-resistant impeller and 7 m self-priming is suitable for pumping diluted slurry from tanks in the barn to a tanker or storage tank. It is used every day in cattle and pig breeding.
Dehydration after heavy rainfall. Flooded basements, flooded construction trenches, flooded manholes - everywhere PRO gives a capacity of 1000 l/min, which allows you to quickly control the situation. This is also a typical application for Volunteer Fire Department units.
Fighting the effects of floods. PRO is a popular choice for volunteer fire departments as a backup pump. Mobility (pump on the tractor's three-point linkage) and independence from fuel other than what the tractor already has are key advantages here.
Water supply in the field. Pumping water from a pond, river or retention tank to a water tanker - typical use in periods of drought, when you need to deliver water to crops or water animals in pastures away from the intake.
All tractor pumps Our offer can be viewed in the product category: Dambat tractor pumps. All tractor pumps We deliver the PTO shaft included, which eliminates the need for additional purchases at the start.
Why is it worth choosing IBO pumps from Dambat
Brand IBO, produced and distributed in Poland by our company Dambat, has been operating on the market for over two decades. We export our pumps to over 30 countries. Each water pump delivered to our customers undergoes quality control before it is sent for distribution. Each water pump in our offer is covered by a manufacturer's warranty and technical support in Polish. IBO tractor pumps also have the advantage that spare parts (impellers, seals, bearings, shaft crosses) are available off the shelf in our service - no customer is left with a disabled pump in the middle of the season.
Technical support, availability of spare parts and authorized service make this possible PTO pumps Dambat is chosen by both individual farmers and service companies, large-scale farms and local government units. If you need support in selecting the right model - whether it is a PTO water pump or a classic submersible, circulation or circulation pump from our wider offer - please contact our technical department. The full range of pumps and accessories can be found at Dambat home page, and all tractor pumps - at the link to the category above.
FAQ - most frequently asked questions about PTO water pumps
What is the difference between a PRO and PRN pump?
PRO is a self-priming pump intended for dirty water, slurry and drainage - capacity 1000 l/min, lifting height 30 m. PRN is a normally suction pump (requires flooding) for clean water - lower efficiency (750 l/min), but much higher pressure and lifting height (70 m, 7 bar). PRO choose for intervention and slurry, PRN for pressurized irrigation.
What PTO speed is required to drive the PRO and PRN pumps?
The required PTO shaft speed for both models is 540 rpm. In tractors with a PTO of 1000 rpm, switch the mode to 540 or use an external intermediate reducer. Exceeding this value leads to excessive heating of the reducer and accelerated seal wear.
What kind of tractor is needed to drive the PTO tractor pump?
The minimum tractor power is 15 HP, maximum 125 HP. PRO and PRN pumps are therefore compatible with most Polish agricultural tractors - from Ursus C-330 to modern machines with over 100 HP. A standard 540 rpm PTO, a 1⅜″ six-spline shaft and a functional three-point linkage of category I or II are required.
Can the PRN pump pump slurry?
NO. PRN is intended only for clean water, without solid contaminants. We use the PRO model for manure and dirty water. Attempting to pump contaminated liquid with a PRN model will result in rapid impeller wear and mechanical seal leakage.
What oil and grease should be used in a tractor pump?
Gear oil: SAE 90 (for the reducer box). PTO shaft grease: lithium grease. We check the oil level before each season; replacement every 2 years or after 500 operating hours - whichever comes first.
Do I need additional accessories for the pump?
The pump is supplied with a power take-off shaft. You should purchase: a 3″ spiral suction hose with a basket and a non-return valve, a delivery hose (W-75 firefighter's hose or PVC spiral with a minimum pressure class of 10 bar for PRN), optional Storz-type firefighter's connectors for quick connection, and a pressure gauge and, if necessary, a mesh filter for drip installations.
Is the PRO pump suitable for fire and flood protection?
Yes, the PRO pump is a popular solution for volunteer fire departments and municipal services as a backup pump. Capacity of 1,000 l/min and self-priming from a depth of up to 7 m are useful in flood prevention operations. However, it is not a fire-tested pump - it has an auxiliary function and does not replace motor pumps with appropriate certificates.
How to protect the pump for winter?
After the season, completely drain the water from the pump body (drain screw at the bottom), blow out the connectors with compressed air, lubricate the transmitter shaft with lithium grease, and check the oil level in the reducer. Store the pump in a dry, frost-free room. Frozen water in the body can burst the cast iron casing - this is the most common cause of post-season complaints.
Can I use the PRO pump on an external power unit instead of the PTO?
The PRO and PRN design provides for drive from the tractor's PTO at 540 rpm. Attempting to drive it using an internal combustion engine or an electric engine would require a complete reconstruction of the mounting and transmission system - in practice, this does not make economic sense. If you need a pump with its own motor, it is better to consider a motor pump or an electric surface pump from our offer.
