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K3V112DT is a tandem variable piston pump for open-circuit hydraulic systems. Swashplate type. In plain terms, this is the kind of main pump people usually look at for excavators and other mobile machines where one simple fixed pump would not be enough. The K3V family is built around construction machinery use, and the DT version means the pump is arranged as a tandem double pump rather than a single section.
What usually makes this pump more useful than a simpler layout is the package as a whole. The tandem arrangement removes the need for a separate power-divider gearbox, which helps transmission efficiency and keeps the unit lighter. The family is also described with improved power density, efficiency, reliability, and a wide range of control methods that can respond to mechanical, hydraulic, or electrical input. So on real machines, it is not only about flow. It is also about how the pump behaves with the engine and the rest of the hydraulic system.
For actual machine use, the fit is pretty straightforward. The K3V/K5V product overview lists excavators, wheel loaders, rough terrain cranes, and crushers, and the broader K3V product the family around construction and mobile machinery. So K3V112DT belongs in that world. Heavy mobile equipment. Main pump duty. Real jobsite hydraulics.
Key Features & Benefits
Tandem double-pump layout helps one input source feed more than one main hydraulic function.
Swashplate axial piston design gives variable output instead of one fixed flow all day.
The tandem arrangement is designed to remove a power-divider gearbox, helping transmission efficiency and reducing weight.
The spherical valve plate and improved hydraulic balance are used to keep cylinder rotation stable and efficiency high, even in lower-pressure and lower-speed operation.
Large-capacity main bearings and the piston-return mechanism are used for longer service life.
Low-noise design is one of the core K3V family points, helped by valve-plate design and housing rigidity.
The control side is flexible, with support for mechanical, hydraulic, and electrical input styles across the family.
DT pumps in this family use one common suction port, which helps keep the layout cleaner on the machine side.
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Technical Data
|
Model |
Pump Type |
Displacement (cc/rev) |
Rated Pressure (bar) |
Max Pressure (bar) |
Max Self-Priming Speed (rpm) |
Max Boosted Speed (rpm) |
Actual Operating Speed (rpm) |
Max Available Flow (L/min) |
Common Porting* |
|
K3V112DT |
Tandem variable piston pump |
2 × 55 |
320 |
350 |
2600 |
3000 |
2100 |
2 × 115 |
A1/A2 delivery, B1 suction, Dr drain, Pi1/Pi2 pilot, PSV servo assist |
The figures above reflect a common K3V112DT instruction-manual setup: 2 × 55 cc/rev displacement, 320 bar rated pressure, 350 bar maximum pressure, 2600 rpm self-priming speed, 3000 rpm boosted speed, 2100 rpm actual operating speed, and 2 × 115 L/min maximum available flow. The same manual also lists 319 Nm maximum input torque and 70 kW maximum input power for that configuration.
*A common service-manual port map shows A1/A2 delivery ports as SAE 6000 psi 3/4 in, B1 suction port as SAE 2500 psi 2 1/2 in, Dr drain port as G 3/4-20, and Pi1/Pi2 plus PSV as G 1/4-15. Another machine-side K3V112DT pump-device document shows versions with 1 in delivery ports and extra A3/B3 gear-pump ports, which is why we normally confirm the exact suffix before quoting.
For oil side conditions, one common K3V112DT manual lists anti-wear hydraulic fluid, 10–200 cSt working viscosity, -20°C to 95°C temperature range, nominal 10 micron return-line filtration, and fluid cleanliness code 18/15.
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Working Principle
The input shaft turns both pumping sections, and the pistons start cycling
Inside K3V112DT, the drive shaft rotates the cylinder blocks, and the pistons run against the swashplate. Once the swashplate is tilted, the pistons move through suction and discharge strokes. That is what creates flow. Because this is a tandem pump, the layout is built to do that in a double-pump arrangement instead of one single section.
The swashplate angle changes the output instead of locking the pump at one flow
This is one of the main reasons the K3V family works well on mobile machinery. The pump is variable displacement, so output changes with the swashplate position. The family is also described as having a wide range of responsive controls, which is why it can be matched to different machine control styles instead of forcing one fixed hydraulic behavior on every machine.
The tandem layout helps the machine split hydraulic work more naturally
On actual machines, the tandem arrangement helps the hydraulic system support more than one main function from the same pump package. That is one reason the family is used on excavators and other construction machines. It is not just about pressure. It is about getting usable flow where the machine needs it without making the whole pump section too bulky or too complicated.
Model Range
K3V112S
Single-pump format. Straight choice when one main pump section is enough.
K3V112DT
Tandem double-pump layout.
K3V112DP
Parallel double-pump arrangement. Better for some machine layouts.
K3V112DTP
Tandem layout with additional drive-related configuration.
The published 112-size range in the K3V family includes these layout formats.
Applications & Industries
Excavators
This is the most obvious fit. K3V pumps are aimed at earthmoving and construction machinery, and K3V112DT is commonly used as a tandem main pump on excavator platforms.
Construction Machinery
The K3V family is described for construction-industry hydraulic work, so loaders, crawler equipment, and similar heavy mobile machines are natural fit directions.
Earthmoving Equipment
This is basically the home turf for the series. High-pressure open-circuit pump, tandem layout, machine-duty regulator logic. That combination is built around moving dirt, not around lab equipment.
Hydraulic Rebuild & Replacement Market
Because the model has many suffix codes and machine-side variations, it shows up a lot in repair and replacement work where buyers bring an old unit code or a nameplate photo first. That is an inference from the number of listed K3V112DT variants and service-manual configurations in the available sources.
Mobile Hydraulic Power Units on Machines
This pump is open-circuit and high-pressure, so it fits machine-mounted hydraulic power sections where multiple functions have to be supported from a tandem unit. That is consistent with the tandem construction and control scheme described in the manuals.
OEM Machine Builds and Service Supply
The range of controls and the presence of multiple K3V sizes make it practical for both original machine builds and later service replacement, especially where the hydraulic layout is already designed around this tandem pump structure.
About Us
Sheungchak is an OEM hydraulic manufacturer focused on pumps, motors, valves, and related spare parts. We produce our own products and support customers from model confirmation through shipment.
Most buyers are really checking a few basic things.
Model right or not. Quality stable or not. Lead time clear or not.
That is how we handle K3V112DT orders too.
OEM production
Nameplate customization
Packing adjustment
Drawing or sample confirmation
Export shipment suppor
Years in business
20+ years
Main products
Axial piston pumps / hydraulic motors / valves / spare parts
Main markets
Europe / South America / Middle East / Southeast Asia / Africa
Main strengths
OEM production / technical support / stable lead time / export service
Certifications
Certificate name
Certificate name
Certificate name
Certificate name
Certificate name
Our Factory & Quipment
cooperative partner
We are looking for a cooperative partner to expand our business.
FAQ
1) Is K3V112DT a single pump or a tandem pump?
It's a tandem type double pump. The model structure for K3V uses DT for tandem double pump, and the K3V112DT documents describe the main pump as two piston pumps plus a valve block.
2) What displacement does K3V112DT use?
A common K3V112DT service-manual configuration is listed as 2 × 55 cc/rev. The K3V series size code also marks 112 cm³ as the size class.
3) What pressure can this pump handle?
On the common service-manual setup, rated pressure is 320 bar and maximum pressure is 350 bar.
4) What speed and flow are typical?
The same configuration lists 2600 rpm self-priming, 3000 rpm boosted, and 2 × 115 L/min maximum available flow. Actual machine use still depends on the regulator setting and the machine side.
5) What control style does it use?
Typical K3V112DT documentation lists simultaneous total horsepower control, negative flow control, variable horsepower control, and two-stage maximum flow control. The broader K3V family also supports mechanical, hydraulic, and electrical control inputs depending on version.
6) Does it only fit one excavator model?
No. The pump family is used in construction and earthmoving machinery more broadly, and the exact fit depends on the full suffix code, regulator arrangement, shaft direction, and port layout. That is why we usually ask for the old nameplate or full model code first.
7) What oil condition should be kept?
A common K3V112DT manual calls for anti-wear hydraulic fluid, 10–200 cSt working viscosity, nominal 10 micron return-line filtration, and cleanliness code 18/15. Clean oil matters a lot on this pump.
8) What do you need before quoting the right unit?
Best case, send the full old model code. If not, send nameplate photos, shaft detail, regulator side photos, port layout, and machine model. On K3V112DT, that saves a lot of back-and-forth because there are real differences between sub-codes and attached-gear-pump versions.
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