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Series S
MS hydraulic motors feature a rugged disc valve Gerotor design and deliver maximum reliability for medium-duty to heavy-duty applications in industrial and mobile equipment. With a wide range of flange, port, and shaft options, as well as torque ratings up to 99 daNm, they can be optimally configured for conveyors, construction machinery, mining, or agricultural applications. Learn more...
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Their durable construction with tapered roller bearings ensures high load capacity and maximum efficiency even under demanding operating conditions.
MS Series Hydraulic Motors – Frequently Asked Questions
For which applications are MS Series hydraulic motors primarily designed?
MS Series hydraulic motors are highly versatile and are typically used in the following areas:
- Conveying systems
- Metalworking machines
- Road construction machinery
- Mining machinery
- Food industry
- Agricultural machinery
- Special-purpose vehicles
Their rugged construction and high performance make them ideal for demanding operations.
What types of MS Series hydraulic motors are available and what special features do they have?
- MS(F): Standard motor with flange mounting
- MSW: Wheel hub motor
- MSS: Short motor
- MSV: Very short motor
- MSQ: Square mounting flange
- MSB: Motor with drum brake
Additional options: tachometer drive, side/rear ports, various shaft types (straight, splined, tapered), SAE, metric, and BSPP ports.
What operating conditions and fluid requirements need to be observed?
- Hydraulic oil: HLP (DIN 51524) or HM (ISO 6743/4), premium quality, anti-wear
- Temperature range: -40 °C to 140 °C
- Optimal viscosity: 20–75 mm²/s (98–347 SUS)
- Minimum viscosity: 13 mm²/s (70 SUS) at 50 °C
- Max. system temperature: 82 °C (180 °F)
- Filtration: ISO 20/16, nominal 25 μm or better
- Run-in: 10–15 min at moderate load/speed before full load
- Intermittent: max. 10% per minute, peak load max. 1% per minute
What is the permissible shaft seal pressure and the maximum return pressure without a case drain line?
- Max. shaft seal pressure: 85 bar (continuous), 99 bar (intermittent)
- Max. return pressure without case drain line: must not be exceeded
- Route the case drain line so that oil can flow freely back to the tank
What types of shaft extensions and torque limits are available?
- SL: Ø32 mm, straight, 77 daNm
- K: Tapered 1:10, 95 daNm
- SH: PTO shaft DIN 9611, 77 daNm
- CO: Ø1¼" straight, 77 daNm
- SA: Ø1¼" splined 14T, 95 daNm
- SA-T: 7/8"-13 splined, 20 daNm
How do radial and axial shaft loads affect service life?
The output shaft runs in tapered roller bearings for high radial/axial load capacity.
- Permissible radial load: depends on the distance from load point to flange
- Exceeding the values will significantly reduce service life
How does the drum brake work on the MSB motor?
The drum brake is mechanically actuated via a brake lever:
- Rotate brake lever → brake shoes press against brake drum
- Release → springs retract the shoes
- Min. angle setting: 10° (adjustable by disassembly)
- Direction of actuation selectable
- Rod linkage: min. 25 mm movement between neutral and extreme