501 Series White Drive Hydraulic Motor 4-Hole Key Shaft

Item	Torqmotor
OEM	501300A3120ZAAAA
Manufacturer	XLF Hydraulic
Displacement	130 Ml/r
Mounting Flange	4-hole
Shaft Type	Key Shaft
Highlight	re white hydraulic motors, 501 series white hydraulic motors, 250 rpm white drive products hydraulic motor

The 501 Series White Drive hydraulic motor is a flagship product from the RE 500/501 series of gerotor hydraulic motors under White Drive Products (acquired by Danfoss in 2016).

This model comes standard with a 4-Hole Square Flange and a Key Output Shaft. It belongs to the Low Speed High Torque (LSHT) hydraulic motor product line and is renowned for its excellent stability and cost-effectiveness.

Adopting a reliable Gerotor gear set design and a three-section axial flow distribution structure, this motor efficiently converts hydraulic energy into mechanical energy. With a rated operating speed of 250 RPM, it provides ideal power matching for various light to medium-load equipment. As a member of the RE 500/501 series, this motor enables plug-and-play seamless replacement with equivalent products from major international brands including Danfoss OMP and Eaton Char-Lynn H series.

Brand Background: White Drive Products is a world-renowned manufacturer of gerotor hydraulic motors and steering solutions. After Danfoss acquired White Drive Products in 2016, all product labels have been unified under Danfoss, yet the product designs and technologies originate from White's proprietary patents.

1. Gerotor Gear Set Design - Proven Cycloid Technology
The 501 series adopts a Gerotor gear set design, consisting of an inner rotor and an outer gear ring (stator), with the following features:

• Low starting pressure: Its low-pressure starting characteristic ensures rapid response of the hydraulic system and reduces startup delay.
• Smooth operation: Multi-tooth meshing design delivers uniform torque output without pulsation, enabling stable and smooth operation.
• Simple and reliable structure: With only a few moving parts, it has fewer failure points and low maintenance costs.
• Long service life: Precision machining reduces gear wear, with a B10 service life ≥ 8,000 hours.

2. Three-Zone Axial Flow Distribution Technology - Stable and Reliable
It adopts a Three-Zone Spool Valve design, combined with White's patented Roller Stator technology:

• Integrated check valve: Standard housing external leakage connection effectively reduces housing pressure and extends the service life of shaft seals.
• Pressure compensated balance plate: Provides high volumetric efficiency during startup and ensures reliable startup under low flow rates.
• Stable performance: Achieves stable operation within a wide range of rotational speeds and torques without creeping phenomenon.

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