Name: Sauer Danfoss Series 40 Piston Pump | MPV & MPT | Closed Circuit Pump
SKU: Sauer Danfoss Series 40 (MPV / MPT)

Sauer Danfoss Series 40 (MPV / MPT)

SKU: Sauer Danfoss Series 40 (MPV / MPT)

The Sauer Danfoss Series 40 is a family of high-performance variable displacement axial piston pumps designed for medium-power hydrostatic transmissions. The series includes the MPV (Single Variable Pump) and MPT (Tandem Variable Pump) configurations. Renowned for their compact design and reliability, Series 40 pumps are the industry standard for closed-circuit applications in mobile equipment such as skid steer loaders, aerial lifts, and pavers.

Key Features:

Series: Series 40 (M25, M35, M44, M46)
Configuration: MPV (Single) / MPT (Tandem)
Circuit: Closed Circuit (Hydrostatic)
Max. Pressure: 345 bar (5000 psi)

Product Overview The Sauer Danfoss (Danfoss Power Solutions) Series 40 pumps utilize a parallel axial piston / slipper design in conjunction with a tiltable swashplate to vary the pump’s displacement. Reversing the angle of the swashplate reverses the flow of oil, allowing for smooth direction changes in vehicle propulsion.

MPV Models: Compact single pumps often used in smaller vehicles or auxiliary circuits.
MPT Models: Tandem pumps (two independent rotating groups in one housing) specifically designed for dual-path propulsion vehicles like Skid Steer Loaders and Trenchers.

Why Choose Series 40 (MPV/MPT)?

Integrated Design: Most models feature built-in charge pumps, high-pressure relief valves, and system check valves, reducing external plumbing.
Precision Control: Available with Direct Displacement Control (DDC) for direct operator feedback or Hydraulic/Electric Servo Control for ease of operation.
Tandem Capability: The MPT design allows driving two independent motors from a single engine power source, essential for zero-turn radius equipment.
Proven Durability: A time-tested design that offers high reliability in harsh construction environments.

Common Applications:

Skid Steer Loaders: (Bobcat, Case, Caterpillar, Gehl)
Road Machinery: Vibratory Rollers, Pavers
Agriculture: Sprayers, Harvesters
Turf Care: Commercial Mowers

Specification	Value / Description
Product Type	Axial Piston Variable Displacement Pump
Circuit Type	Closed Circuit (Hydrostatic)
Series	Series 40
Model Types	MPV (Variable Single) MPT (Variable Tandem) M (Fixed/Variable Motor)
Frame Sizes	M25, M35, M44, M46
Displacement ( $V_g$ )	M25: 25 cm³/rev M35: 35 cm³/rev M44: 44 cm³/rev M46: 46 cm³/rev
Nominal Pressure	210 bar (M25) / 345 bar (M35, M44, M46)
Peak Pressure	345 bar (M25) / 415 bar (M35, M44, M46)
Max. Speed ( $n$ )	3000 – 4000 rpm (Size dependent)
Control Types	Manual Displacement Control (MDC), Hydraulic Displacement Control (HDC), Electric Solenoid
Common Part Numbers	Model Code Examples: MPV046-BB-GR-HD… (Single 46cc Pump) MPT044-CA-GR… (Tandem 44cc Pump) MPT035… (Tandem 35cc Pump) MPV025… (Single 25cc Pump) 42-42-… (Older designation) Note: Complete model code is required for exact replacement (e.g., specific shaft, relief setting).