Sundstrand Hydraulic Pump & Motor Guide: Series 20, 90 & Seal Kits
Sundstrand built its name on rugged hydrostatic piston pumps and motors used in mobile and industrial machinery. Now part of the Danfoss family (via Sauer-Danfoss), Sundstrand units are still in service everywhere — and when one needs a seal kit or replacement part, correctly identifying the series is the key to ordering the right component. This guide covers the main Sundstrand families and how to read them.
Sundstrand pump & motor series at a glance
RestoPower stocks aftermarket, OEM-equivalent parts for the most common Sundstrand series:
- Series 15 & 18 – compact hydrostatic units common on smaller mobile equipment.
- Series 20 – one of the most widely used variable-displacement transmission pumps and motors.
- Series 22 & 24 – mid-frame hydrostatic pumps and motors for heavier duty cycles.
- Series 30, 40 & 45 – higher-displacement piston pumps for demanding industrial and mobile applications.
- Series 90 – the modern Sauer-Danfoss closed-circuit axial piston family for hydrostatic drives.
How to read a Sundstrand model number
Sundstrand codes generally start with the series designation (for example, a leading number that identifies the frame size), followed by characters that define displacement, control type, shaft, and porting. Because so many custom and legacy variants exist, always record the complete model number and any casting or nameplate numbers — every character matters when matching a seal kit or replacement piston pump part.
Where to find your Sundstrand model number
Look for the stamped nameplate or ink-stamped code on the pump housing or end cap. If the tag is missing or unreadable, note the shaft type, port arrangement, and any part numbers cast into the housing — our team can often cross-reference from those details.
Seal kits and rebuild parts
Most Sundstrand service jobs come down to the correct Sundstrand seal kit for your exact frame and shaft. We carry seal kits for Series 15, 18, 20, 22, and 24 units, plus shafts, hardware, and rebuild components for Sundstrand piston pumps and motors.
Find your Sundstrand parts at RestoPower
We stock aftermarket, OEM-equivalent Sundstrand piston pump parts and Sundstrand seal kits, backed by a 2-year no-hassle warranty and same or next-day shipping from Lake Orion, MI. Browse the full Sundstrand parts and pumps collection to shop by series. Sourcing hard-to-find and obsolete Sundstrand parts is one of our specialties. Browse all brands, request a same-day quote, or download Sundstrand parts catalogs and rebuild guides for exploded views and service data.
Related guides
- Poclain Hydraulic Motor Guide: MS Series & Seal Kits
- Char-Lynn / Eaton Orbital Motor Cross-Reference Guide
- Bosch Rexroth Pump Guide: A10VSO, A4VG & A11VO Series
Frequently asked questions
Which Sundstrand series does RestoPower carry parts for?
We stock aftermarket replacement parts for Sundstrand Series 15, 18, 20, 22, and 24 piston pumps and motors, plus Series 30, 40, 45, and 90 units.
Who owns Sundstrand hydraulics now?
Sundstrand was acquired by Sauer-Danfoss and is now part of the Danfoss group. We carry aftermarket parts compatible with all original Sundstrand-branded equipment.
Can you source obsolete Sundstrand parts?
Yes. Hard-to-find and obsolete hydraulic parts are a RestoPower specialty — send us your full model number and we will locate the correct parts.
What warranty do Sundstrand parts carry?
All of our aftermarket Sundstrand parts carry a 2-year no-hassle replacement warranty, with in-stock items shipping same or next business day.