Sauer danfoss 51V250 high displacement hydraulic motor

The 51V250 is a variable-displacement, bent-axis design axial piston motor from Danfoss's Series 51 and 51-1 product line. The "250" in the name refers to its nominal displacement of 250 cm³ per revolution — the largest frame size in the Series 51 range, which also includes 60, 80, 110, and 160 cc variants.

Unlike fixed-displacement motors, the 51V250 uses a tilting bent-axis rotating group with spherical pistons, allowing displacement (and therefore output speed and torque) to be adjusted while the motor is running. That adjustability is what makes it a "high displacement" motor in the truest sense — it isn't just large, it's engineered to swing across a wide displacement window to match load and speed demands on the fly.

Core Design Features

Bent-axis architecture: The cylinder block sits at an angle to the drive shaft, which allows for a more compact, robust design than swash-plate motors of comparable output.

Spherical pistons: Reduce friction and wear compared to cylindrical piston designs, contributing to a longer service life under high-pressure cycling.

5:1 displacement ratio: The motor can vary between roughly 20% and 100% of its maximum displacement, giving a wide speed range without changing gearing.

Starts at maximum displacement: This is a deliberate design choice — it delivers maximum starting torque and acceleration, then destrokes as speed builds.

Control Options

Danfoss offers a wide family of control/regulator options for the Series 51 line, including:

Hydraulic proportional controls (e.g., JA, HP)

Electric proportional controls (e.g., L1–L8)

Hydraulic two-position controls (N2)

Pressure compensators (PC/PD), including defeat variants for pump-mode operation

Electric-hydraulic two-position controls with pressure compensation (T1–T4)

Choosing the right control isn't cosmetic — it determines how the motor responds to load spikes, whether it can be electronically integrated into a machine's control system, and how it behaves during regenerative or overrunning conditions.

Real-World Applications

The 51V250's combination of high torque, wide displacement ratio, and closed-loop compatibility makes it a common choice in:

 Winch and Hoist Drives

High starting torque at maximum displacement is exactly what a winch needs under initial load — the motor delivers maximum pulling force from a standstill, then destrokes as line speed increases.

Crawler and Track Drive Systems

Bulldozers, crawler cranes, and tracked drilling rigs use large bent-axis motors like the 51V250 for propel circuits, where torque density and durability under shock loading matter more than raw efficiency.

Rotary Drilling and Auger Drives

Drilling applications benefit from the motor's ability to hold high torque at low speed for breakout, then shift toward higher speed once the bit is advancing freely.

Conveyor and Material Handling Drives

In bulk material handling — inclined conveyors, stackers, and similar equipment — variable displacement lets a single motor cover a wide range of belt speeds and load conditions without a separate gearbox change.

For more information on the 51V250 hydraulic motor, please visit https://www.baolilaihydraulic.com/.

Specifications

Selection Table

Q1: Why does the motor start at full displacement?

A1: Starting at maximum displacement maximizes torque output at zero speed, which is crucial for overcoming static friction and inertia in heavy loads, such as winches, tracked vehicles, and drilling equipment.

Q2:How do I identify the exact configuration of a 51V250 I already have?

A2: Look for the full alphanumeric part number stamped on the motor's identification plate — it will include displacement, control type, shaft type, port configuration, and rotation, and is the only reliable way to source an exact replacement or rebuild kit.

Q3: What is the price and delivery time of the 51v250 hydraulic motor?

A3: The specific price and delivery time will be provided based on the specific model you provide.

Q4:How to purchase a 51v250 hydraulic motor?

A4:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.