Reliable High-Pressure Sealing for Sauer Hydraulic Pumps

Engineered for Sauer Danfoss hydraulic pumps, this UP-type oil seal serves as a direct replacement for OEM part UP0445E. Designed specifically for Sauer 90R series pumps (models 90R100, 90R130, 90R180, and 90R250), it features a robust dust lip configuration that withstands high-pressure hydraulic environments while effectively excluding contaminants. The inch-derived metric dimensions (44.45mm shaft = 1.75 inches, 63.5mm bore = 2.5 inches) ensure a precise fit in these pump housings.

Key Points

UP-Type Dust Lip Design: The UP configuration features a specially engineered dust lip that actively blocks dirt, debris, and moisture from entering the pump housing while maintaining reliable grease and oil retention under high-pressure conditions.

High-Pressure Capable: Built to handle the demanding pressure spikes common in Sauer 90R series bent-axis piston pumps, this seal maintains its integrity where standard seals might fail.

Precision Inch-to-Metric Dimensions: The 44.45mm shaft and 63.5mm bore correspond exactly to 1.75 inches and 2.5 inches respectively — standard sizing for Sauer pump applications. The 9.5mm width provides robust casing stability.

Durable NBR Compound: The nitrile rubber sealing lip offers excellent resistance to hydraulic oils, mineral-based fluids, and moderate temperatures, preserving flexibility and consistent sealing force in continuous pump operation.

Spring-Loaded Primary Lip: A precision garter spring applies uniform radial pressure to the main sealing lip, maintaining positive shaft contact and compensating for minor wear over extended service intervals.

Heavy-Duty Metal Case: The rigid outer casing ensures a secure press-fit into the 63.5mm housing bore, preventing seal movement or leakage due to vibration or pressure cycling.

Direct Sauer Pump Replacement: Designed specifically for Sauer 90R100, 90R130, 90R180, and 90R250 pumps, this seal matches OEM specifications for a hassle-free installation during pump rebuilds or maintenance.

Product Info

Product Name: UP0445E Oil Seal 44.45x63.5x9.5mm
OEM Part Number: UP0445E
Seal Type: UP (Heavy-Duty Dust Lip Design)
Material: Nitrile Rubber (NBR) + Metal Case + Garter Spring
Dimensions: 44.45mm (Shaft) x 63.5mm (Bore) x 9.5mm (Width)
Inch Equivalent: 1.75" x 2.5" x 0.374"
Primary Application: Sauer 90R100, 90R130, 90R180, 90R250 Hydraulic Pumps
Package Includes: 1 x UP High Pressure Oil Seal (OEM # UP0445E, Size 44.45x63.5x9.5mm)

Hydraulic pump systems require stable shaft sealing to maintain operational efficiency and reduce contamination risks. DMHUI UP seals are built for these conditions.

Dust-Protection Lip Design
Helps minimize the entry of dirt and external particles into the hydraulic system.

Stable Oil Retention Performance
Maintains sealing contact during shaft rotation and pressure-loaded operation.

Precision Manufacturing
Produced with accurate dimensional tolerances for reliable fit and installation.

Ideal For Use In
Hydraulic Pumps:
Sauer 90R series hydraulic pumps and rotating hydraulic assemblies
Construction Equipment:
Excavators, loaders, road machinery, and hydraulic drive systems
Industrial Hydraulic Systems:
Equipment requiring stable oil retention and contamination protection

FAQ

Q: Which Sauer pump models is this seal compatible with?
A: The UP0445E seal is designed for Sauer 90R series pumps, specifically models 90R100, 90R130, 90R180, and 90R250. These are bent-axis variable displacement piston pumps commonly used in mobile and industrial hydraulic systems.

Q: Are these metric or inch dimensions?
A: The dimensions are metric conversions of inch sizes. 44.45mm = 1.75 inches (shaft), 63.5mm = 2.5 inches (bore). This matches the original Sauer imperial specifications. Do not substitute with 45x65x10 metric seals — they will not fit.

Q: Can I use this seal for other pumps besides Sauer 90R series?
A: While it may physically fit other pumps with the same 44.45x63.5x9.5mm dimensions, the UP lip geometry is tuned for Sauer pump operating characteristics. For other brands, consult your pump manual. For Sauer 90R series, this is the correct replacement.

Q: What fluids is this seal compatible with?
A: The NBR material is compatible with most mineral-based hydraulic oils (ISO VG 32, 46, 68), lubricating oils, and greases used in Sauer pump systems. Avoid use with phosphate ester fluids, brake fluids, or high-temperature synthetic oils unless compatibility is confirmed.

Q: Do you offer seal kits for complete Sauer pump rebuilds?
A: We offer individual seals. For full pump rebuild kits including o-rings, gaskets, and backup rings, please contact us with your specific pump model and serial number.

Note: This product is an aftermarket replacement component. Always verify the OEM part number and dimensions from your original seal or Sauer pump manual prior to purchase. The 44.45mm shaft and 63.5mm bore are imperial-derived — confirm these exact measurements before ordering. Proper installation is essential for leak-free performance in high-pressure hydraulic systems.

Trust in quality, choose DMHUI
DMHUI sealing solutions help support stable hydraulic system operation with dependable shaft sealing and contamination protection.