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WR

Product catalog summary

Overview: The WR Series hydraulic motor is engineered for light-duty applications, featuring advanced design elements for improved performance, efficiency, and durability. It employs an optimized Roller Stator® geometry with seven precision rollers to reduce friction and enhance efficiency. Key components include a three-zone spool valve, integral check valves, and a case drain provision to lower internal seal pressure, thereby extending the motor's lifespan. The motor offers various mounting, shaft, displacement, and porting options to accommodate different applications.

Specifications: The WR Series is equipped with a high-pressure shaft seal for enhanced seal longevity, a spool valve design for optimal performance across a broad speed and torque range, and built-in check valves for increased versatility and seal durability. Detailed specifications include rotor width measurements in both millimeters and inches, with examples such as 47.4 mm (1.865 inches) and 57.2 mm (2.252 inches). Displacement performance is tested at 54°C with an oil viscosity of 46cSt.

Features/Benefits: This motor is ideal for applications like conveyors, carwashes, positioners, light-duty wheel drives, sweepers, food processing, grain augers, spreaders, feed rollers, screw drives, and brush drives. The optimized Roller Stator® geometry ensures smooth operation and high efficiency.

Performance Data: Typical performance data may vary slightly between production units. The motor's performance is defined by maximum speed, flow, torque, and pressure ratings, with specific values for different displacement models (e.g., 040, 050, 060, etc.). Intermittent ratings should not exceed 10% of operation time. Tables provide torque in Nm and lb-in, speed in rpm, and flow in lpm and gpm, with efficiency ratings categorized into three ranges: 70-100%, 40-69%, and 0-39%.

Pressure Ratings: Maximum intermittent and continuous pressure ratings are specified in bar and psi, with intermittent ratings limited to 10% of operation time.

Housing Dimensions: Dimensions are provided without paint, noting that paint thickness can be up to 0.13 mm. Various mounting options are detailed, including SAE A and B mounts, with specific dimensions for each configuration.

Shaft Seal Pressure: A curve illustrates allowable seal pressure at various speeds, explaining the relationship between check valves, drain connections, and shaft seal pressure.

Bearing and Load Information: A bearing curve shows the side load capacity of the motor at different speeds. Operating within the shaded area of the curve is recommended to ensure adequate lubrication and prevent motor failure.

Thrust Load and Length & Weight Charts: Dimensions K and L define the overall motor length from the rear to the mounting flange surface. Motor weights can vary by ±0.5 kg depending on model configurations.

Catalog excerpts

whitedriveproducts LIGHT DUTY Hydraulic Motor SERIES 255 256 - WR

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For Light Duty Applications The WR Series motor incorporates the latest advances for smooth performance, efficiency and durability. It features an optimized Roller Stator® geometry with seven preci- sion rollers to eliminate sliding friction and provide rolling contact between the rotor and stator. This increases motor efficiency. A three-zone spool valve, integral check valves and a provision for a case drain reduce pressure on internal seals to improve product life. A wide variety of mounting, shaft, motor displacement and porting options are available to meet all application needs. FEATURES...

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white drive pro ducts For Light Duty Applications DISPLACEMENT PERFORMANCE Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54°C [129°F] with an oil viscosity of 46cSt [213 SUS] Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54°C [129°F] with an oil viscosity of 46cSt [213 SUS] ► Performance data is typical. Performance of production units varies slightly from one DELIVERING THE POWER TO GET WORK DONE

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For Light Duty Applications white drive pro ducts DISPLACEMENT PERFORMANCE Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54°C [129°F] with an oil viscosity of 46cSt [213 SUS] Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54°C [129°F] with an oil viscosity of 46cSt [213 SUS] ► Performance data is typical. Performance of production units varies slightly from one DELIVERING THE POWER TO GET WORK DONE

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white drive pro ducts For Light Duty Applications DISPLACEMENT PERFORMANCE Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54DC [129DF] with an oil viscosity of 46cSt [213 SUS] Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54°C [129°F] with an oil viscosity of 46cSt [213 SUS] ► Performance data is typical. Performance of production units varies slightly from one DELIVERING THE POWER TO GET WORK DONE

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For Light Duty Applications white drive pro ducts DISPLACEMENT PERFORMANCE Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54DC [129DF] with an oil viscosity of 46cSt [213 SUS] Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54°C [129°F] with an oil viscosity of 46cSt [213 SUS] ► Performance data is typical. Performance of production units varies slightly from one DELIVERING THE POWER TO GET WORK DONE

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white drive pro ducts For Light Duty Applications DISPLACEMENT PERFORMANCE Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54DC [129DF] with an oil viscosity of 46cSt [213 SUS] Torque - Nm [Ib-in], Speed rpm Intermittent Ratings -10% of Operation Theoretical Torque - Nm [Ib-in] Displacement tested at 54°C [129°F] with an oil viscosity of 46cSt [213 SUS] ► Performance data is typical. Performance of production units varies slightly from one DELIVERING THE POWER TO GET WORK DONE

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Light Duty Hydraulic Motor white drive pro ducts HOUSINGS ^ Dimensions shown are without paint. Paint thickness can be up to 0.13 [.005]. 4-HOLE, SQUARE MOUNT, ALIGNED MANIFOLD PORTS F37 1/2" Drilled G37 1/2" Drilled 4-HOLE, SQUARE MOUNT, OFFSET MANIFOLD PORTS F33 G 1/2 F3D 7/8-14 UNF 4-HOLE, SQUARE MOUNT, OFFSET PORTS, VALVE CAVITY F39 7/8-14 UNF ► Dimension L is charted on page 15. DELIVERING THE POWER TO GET WORK DONE

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white drive pro ducts Light Duty Hydraulic Motor TECHNICAL INFORMATION ALLOWABLE SHAFT LOAD / BEARING CURVE The bearing curve below represents the side load capacity of the motor at the centerline of the key for various motor speeds. Operating conditions within the shaded area will maintain acceptable oil film lubrication with recommended fluids. Operating conditions outside the shaded area are susceptible to motor failure due to oil starvation and/or excessive heat generation. Fluids with low lubricity or low viscosity may require the maximum load and speed rat- ings to be derated to provide...

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