Poclain Hydraulic Motor Guide: MS Series & Seal Kits Explained

Poclain is a French manufacturer best known for its radial-piston hydraulic wheel motors used in mobile equipment, agricultural machinery, drilling rigs, and heavy-duty drive systems. Because Poclain parts can be hard to source in North America, identifying your exact MS-series motor is the first step to ordering the right seal kit or component. This guide covers the Poclain MS motor range and how to find the correct Poclain motor parts for a reliable rebuild.

Poclain MS series at a glance

The Poclain MS (and MSE) family spans a wide range of displacements and torque ratings. The series you are most likely to encounter include:

• MS02 and MS05 — compact wheel motors for lighter drive and auxiliary applications.
• MS08 and MS11 — mid-range motors common in mobile and agricultural equipment.
• MS18 and MS25 — higher-torque motors for demanding drive systems.
• MS35 and MS50 — heavy-duty, high-displacement wheel motors.
• MSE series — electronically-managed variants within the Poclain range.

How to identify your Poclain motor

Poclain motors carry a nameplate with the full model code, which specifies the MS frame size, displacement, valving, shaft, and mounting configuration. If the nameplate is missing or unreadable, the housing casting numbers, port arrangement, and physical size help narrow down the series. Send us the complete code and we will match the exact parts.

Which Poclain parts wear out first?

On Poclain radial-piston motors, the most commonly replaced items are the shaft and cover seals, along with internal wear components such as cam rings, pistons, rollers, valve plates, and cylinder blocks. A complete hydraulic seal kit handles most leaks, while worn rolling and valving components require rebuild parts matched to your exact MS series.

Poclain seal kits vs. full rebuild parts

For most Poclain MS motors, the first repair is a Poclain seal kit that replaces the shaft seal, cover O-rings, and static seals to stop external leaks. If the motor is losing torque, running hot, or making noise, the wear has usually reached the internal rolling and valving components. In that case a seal kit alone will not restore performance — you will also need cam rollers, pistons, a cam ring, or a valve plate matched to your exact MS frame size. Sending us the full nameplate code lets us tell you whether a seal kit will solve the problem or whether a partial rebuild is the smarter, longer-lasting fix.

Common Poclain applications and troubleshooting

Poclain MS wheel motors drive skid steers, trenchers, drilling rigs, agricultural sprayers, road-milling machines, and other equipment that needs high torque at low speed directly at the wheel or roller. Because these machines run in dirty, high-load conditions, the most common failures we see are contamination-related seal wear, cavitation from starved inlets, and roller or cam-ring pitting from long hours. If your motor leaks at the shaft, it usually needs a seal kit; if it drives weakly or stalls under load, suspect internal wear; and if it whines, check for cavitation and inlet restrictions before replacing parts. Matching the repair to the symptom keeps the rebuild cost down and the motor in service longer.

Related guides

• Sundstrand Hydraulic Pump & Motor Guide: Series 20 & 90
• Char-Lynn / Eaton Orbital Motor Cross-Reference Guide
• Oilgear Pump Parts Guide: PVG, PVWH & PVWJ Series

Poclain motor FAQs

Are Poclain parts hard to find? Poclain is a French brand and parts can be difficult to source in North America — RestoPower specializes in hard-to-find and OEM-equivalent Poclain components.

What is a radial-piston wheel motor? It is a high-torque, low-speed hydraulic motor where pistons act radially against a cam ring — the design Poclain MS motors use for direct wheel drive.

Do RestoPower Poclain parts carry a warranty? Yes — all aftermarket Poclain parts carry a 2-year no-hassle warranty with same or next-day shipping.

Find your Poclain motor parts at RestoPower

Ready to order? Browse Poclain MS02, MS05, MS08, MS11 and MS18 motor parts and seal kits, download Poclain catalogs and rebuild guides, or request a quote and our team will match the exact parts to your motor — with same-day shipping and a 2-year warranty.