The M+S MLHR Series is a high-pressure, high-performance geroler orbital hydraulic motor engineered for demanding low-speed, high-torque applications.

Built around a roll-gerotor (roller-bearing star gear) displacement mechanism, the MLHR Series delivers smooth torque output with a maximum continuous inlet pressure of 175 Bar — significantly higher than standard geroler motors — making it suitable for the most demanding industrial and agricultural drive applications.

Nine displacement sizes from 51.5 to 397 cc/rev provide a wide speed and torque range from a single motor family. The MLHR Series is the US-market equivalent of the Danfoss OMR(US) motor and is a direct functional replacement.

Key Features

• Roll-gerotor orbital displacement mechanism — reduced internal friction, high efficiency at elevated pressure
• 9 displacements: 51.5 to 397 cc/rev
• Maximum continuous inlet pressure: 175 Bar — higher than standard geroler motors
• Maximum intermittent pressure drop: 200 Bar
• Maximum continuous torque: 390 Nm (MLHR 160, 250, 315)
• Speed range: 150 to 775 RPM depending on displacement
• Maximum continuous flow: 60 L/min (40 L/min on MLHR 50)
• SAE A 2-bolt mount — direct replacement for Danfoss OMR(US)
• Standard 1" straight keyed shaft (C shaft code)
• Side Oil ports 7/8" UNF | Oil Case drain 7/16" UNF — standard configuration
• Optional needle bearings, alternative mounts including wheel mount, alternative shafts, BSPP ports, high pressure shaft seal
• Mangano-phosphatized as standard — for corrosion and wear resistance
• Operating temperature: -40°C to +140°C

Technical Specifications

Download the full M+S MLHR Series technical datasheet (PDF):
M+S MLHR Series Technical Data Sheet — Dimensions, Shaft Extensions, Permissible Loads, Order Code

Cross-Reference — Equivalent Motors

The M+S MLHR Series is a direct functional equivalent to the following motors. Use this table to confirm compatibility with your existing installation.

Typical Applications

• Conveyors and material handling drives
• Feeding mechanisms on robots and manipulators
• Metal working and textile machinery
• Agricultural machinery — spreaders, seeders, augers, harvesting equipment
• Food industry processing equipment
• Grass cutting and vegetation management machinery
• High-pressure hydraulic circuits requiring elevated inlet pressure ratings

Ordering Information

Select your required displacement from the Motor Size / Displacement (CC's) dropdown above. All listed prices include the standard build: SAE A 2-bolt mount | 1" straight keyed shaft | Side Oil ports 7/8" UNF | Oil Case drain 7/16" UNF | 150 bar shaft seal. All prices include GST.

Use the additional option selectors to specify your required mounting flange, shaft type, port configuration and shaft seal. If your configuration is not available in the options, or you require a speed sensor, please contact our technical sales team before ordering.

Custom Configuration Options

The MLHR Series is available in a wide range of factory configurations. Pricing is shown in the option selectors above. Contact us for configurations not listed or for volume pricing.

Mounting Flange

• SAE A 2-bolt with a 82.5mm spigot — standard (no upcharge)
• Square 4-bolt with a 44.4mm spigot (Q) — see option selector above
• Magneto 4-bolt with a 82.5mm spigot (F) — see option selector above
• Wheel 4-bolt with a 82.5mm spigot (W) — see option selector above

Needle Bearings

• Not required — standard plain bearings included (no upcharge)
• Add needle bearings (N) — increases radial load capacity — see option selector above

Shaft Extensions

• C — 1" straight keyed — standard (no upcharge)
• K — 1-1/4" straight keyed — see option selector above
• H — 1" straight keyed, 10.3mm cross hole — see option selector above
• R — 1-1/4" 1:8 tapered — see option selector above

Ports

• Side ports 7/8" UNF — standard (no upcharge)
• Side ports 1/2" BSPP (2) — see option selector above

Shaft Seal

• 150 bar (D) — standard shaft seal, included as standard (no upcharge)
• 200 bar (U) — high pressure shaft seal — see option selector above
• 200 bar + check valves (UK) — high pressure shaft seal with check valves — see option selector above

Speed Sensors

Speed sensing options are available for the MLHR Series — contact our technical sales team for pricing and specifications.

Technician's Advice

The following advice is provided by our senior hydraulics technician with over 20 years of field experience installing, commissioning and troubleshooting hydraulic motor systems across agricultural, industrial and mobile plant applications.

Before installation, always flush the hydraulic circuit thoroughly to remove any contamination, metal particles or assembly debris. A new or replacement motor installed into a contaminated circuit will fail prematurely — often within hours. If the circuit has suffered a previous motor failure, assume the oil and filter are contaminated and replace both before fitting the new motor.

Prior to startup, fill the motor case with clean hydraulic oil through the case drain port. This is not optional — running an orbital motor dry, even briefly, will damage the internal sealing elements and void the warranty. On the MLHR Series, the case drain port is 7/16" UNF. Use a grease gun adapter or syringe to pre-fill the case before connecting the drain line.

The case drain line must be plumbed to return directly to the tank, above the oil level, and must never be connected to a pressurised return line. Case drain back pressure must not exceed 3 Bar at any time. Excessive back pressure is one of the most common causes of shaft seal failure on orbital motors — if your circuit has a pressurised return manifold, always fit a dedicated free-flow drain line for the motor.

On initial startup, run the motor unloaded at low speed and low pressure for at least 5 to 10 minutes. Check for external leaks, unusual noise, and abnormal heat. Confirm that the case drain line is flowing — if it is not, stop immediately and investigate. Once the running-in period is complete, gradually increase load and speed to operating conditions.

For applications with high inertia loads — such as conveyors, augers or fan drives — always check whether a counterbalance valve or crossline relief valve is required to protect the motor from overspeed or hydraulic shock on deceleration. The MLHR Series does not include internal check valves as standard (the "UK" shaft seal option adds check valves if required). Uncontrolled load-induced overspeed will shorten motor life significantly. Contact our technical sales team if you are unsure whether your application requires additional circuit protection.

Maintain clean hydraulic fluid at all times. The MLHR Series is rated for operation with mineral-based HLP and HM fluids. Check fluid viscosity is within the 20 to 75 mm²/s operating range and that filtration meets ISO 20/16 or better.

Hydraulic motors are not a set-and-forget item. Once installed, they require the same disciplined attention as any other critical drivetrain component. At installation, torque all flange mounting bolts to the manufacturer's specified value and use thread-locking compound or locking fasteners where vibration is present.
Include mounting bolt torque checks as a standing item on every scheduled maintenance interval — engine oil changes, filter services, or any routine inspection period. The number of motor failures we have attended that trace directly to loose mounting bolts, lock nuts or grub screws on drive couplings is significant. A loose motor rocks on its mount, fatigues the flange, cracks the housing and eventually strips the bolt threads — often causing sudden loss of drive at the worst possible moment.

Pay particular attention to anything that can accumulate around the motor shaft and drive coupling. Fishing line, rope, twine, wire, and fibrous vegetable matter — grass, crop residue, vine — are all capable of wrapping tightly around a rotating shaft. Once lodged between the drive coupling and the motor's shaft seal, the combination of heat and abrasion will progressively destroy the seal lip, score the shaft, and damage the end plate and housing. Oil leaks follow, and if left unattended, the damage quickly extends beyond what a seal replacement can fix. By the time the shaft surface is scored and the bearing journal is affected, the cost of rebuilding the motor approaches or exceeds the cost of a new unit. Inspect the motor shaft area at every service — thirty seconds with a knife to clear accumulated debris is considerably cheaper than a new motor.

If you have any questions about installation, circuit design, fluid compatibility or maintenance schedules for your specific application, call our technical team on 07 5563 1982 before installation — it is much easier to get it right the first time.

Warranty

All M+S Hydraulic motors supplied by hydraulic.online are covered by a 12-month warranty against manufacturing defects. Warranty applies to motors operated within published specification limits using clean, compatible hydraulic fluid. To ensure best motor life, fill with fluid and run at moderate load for 5–10 minutes before applying full load.

Shipping & Freight

We ship hydraulic components across Australia from warehouses in Queensland, Victoria, South Australia, and Western Australia. Because we sell solid steel components — cylinders, pumps, motors, fittings, and hose assemblies — freight costs reflect real weight and real distance. We do not hide freight costs in inflated product prices. What you see is what you pay.

Hydraulic components are manufactured from solid steel. A single cylinder, pump, or motor can weigh 6–150 kg depending on the product. Freight costs vary by product weight, dimensions, and your delivery location. We have negotiated the best available carrier rates for our volume and absorb a portion of freight cost on every order.

Delivery timeframes:

• Standard parcels: 2–7 business days
• Heavy freight: 3–8 business days
• Large/pallet freight: 3–10 business days
• Orders placed before 12 Midday AEST ship same business day (where stock is available)

Out of Stock: It is our intention to maintain active stock on every listed item at all times. On rare occasions, due to high demand or supply constraints, a size may be temporarily unavailable. If this occurs, you will be notified immediately and offered the choice of a full refund or a short wait for incoming stock — typically 3 to 14 days.

About Us

• 20+ years of hydraulics expertise — we know what we are selling
• Australian owned and operated — Gold Coast, QLD
• ABN: 92 969 264 674 — registered Australian business
• Secure checkout — Visa, Mastercard, PayPal, Zip Pay, Direct Deposit
• Tax invoices supplied with every purchase
• Messages answered within normal business hours — 8:00am to 5:00pm Monday to Friday
• Phone: 07 5563 1982 or 1300 1 HOSES
• Email: sales@mhfgc.com.au

Need help selecting the right motor or specifying a custom configuration? Call us on 07 5563 1982 or email sales@mhfgc.com.au — we are hydraulics people, not a call centre.

MM 26/05/2026 All new