Hydro Gear Replacement Lip Seal – Replaces 51161 and 50735, Fits MTD, Cub Cadet & Craftsman
Hydro Gear Replacement Lip Seal – Replaces 51161 and 50735, Fits MTD, Cub Cadet & Craftsman is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Hydro Gear Replacement Lip Seal – Replaces 51161 and 50735, Fits MT...
Hydro Gear Replacement Lip Seal – Replaces 51161 and 50735, Fits MTD, Cub Cadet & Craftsman is backordered and will ship as soon as it is back in stock.
Product Details
This Hydro Gear replacement lip seal is designed for sealing the pump shaft in compatible Hydro-Gear hydraulic pump applications. It is listed for use with BDA, BDP-10A, PE, PG, PJ, and PK Series pumps used in various riding lawn tractors and outdoor power equipment from MTD, Cub Cadet, Craftsman, Troy-Bilt, Bolens, White Outdoors, and related applications.
This aftermarket replacement cross-references Hydro Gear part numbers 51161 and 50735. Husqvarna part number 583039301 is also listed as a related reference.
- Replacement lip seal for compatible Hydro-Gear pump shaft applications.
- Designed as a direct replacement when the original seal dimensions and application match.
- Helps restore sealing performance and reduce leakage caused by a worn or damaged shaft seal.
- Sold as one replacement seal.
Part Number Matrix
Use the following references to compare the replacement seal with the part being removed. Always verify the pump model and seal dimensions before ordering.
| Brand | Part Number | Reference Type |
|---|---|---|
| Hydro Gear | 51161 | Replacement reference |
| Hydro Gear | 50735 | Replacement reference |
| Husqvarna | 583039301 | Related cross-reference |
Pump Compatibility
Check the model identification on your hydraulic pump before installation. The listed application series are:
| Brand | Model or Series | Equipment Application | Related Part Numbers |
|---|---|---|---|
| Hydro Gear | BDA Series | Hydraulic pumps | 51161, 50735 |
| Hydro Gear | BDP-10A Series | Hydraulic pumps | 51161, 50735 |
| Hydro Gear | PE Series | Hydraulic pumps | 51161, 50735 |
| Hydro Gear | PG Series | Hydraulic pumps | 51161, 50735 |
| Hydro Gear | PJ Series | Hydraulic pumps | 51161, 50735 |
| Hydro Gear | PK Series | Hydraulic pumps | 51161, 50735 |
The seal is also associated with equipment using Hydro-Gear hydraulic systems, including applications from MTD, Cub Cadet, Craftsman, Troy-Bilt, Bolens, White Outdoors, and Husqvarna. Brand and equipment compatibility alone does not confirm fitment; match the pump model, original part reference, and dimensions.
Technical Specifications
- Product Type
- Hydraulic lip seal
- Installation
- Direct replacement for a matching original seal
- Dimensions
- 17 x 40 x 7 mm (inner diameter x outer diameter x width)
- Material
- Polyethylene (PE)
- Color
- Black
- Weight
- 0.025 kg (0.88 oz)
- Application
- Hydraulic pump shaft sealing
- Replacement References
- Hydro Gear 51161 and 50735; related Husqvarna reference 583039301
What's in the Box
- 1 x Hydro Gear replacement lip seal
Installation Notes
- Turn off the equipment and safely depressurize the hydraulic system before beginning work.
- Clean the area around the old seal to prevent dirt and debris from entering the pump.
- Remove the worn seal with a suitable seal puller, taking care not to scratch the shaft or housing bore.
- Inspect the shaft and housing for grooves, burrs, or excessive wear. Correct any underlying damage before installing the replacement.
- Lightly lubricate the inner and outer sealing surfaces with clean hydraulic fluid, where appropriate for the pump manufacturer’s service procedure.
- Position the seal squarely in the housing and press it into place with a suitable seal driver or socket that applies even pressure to the correct outer surface.
- Reassemble the pump or related components, restore the hydraulic fluid to the proper level, and check carefully for leaks during operation.
Troubleshooting & FAQ
How do I confirm that this lip seal fits my mower?
Identify the Hydro-Gear pump model or series on your equipment and compare the original seal with the listed dimensions and reference numbers. This replacement is associated with BDA, BDP-10A, PE, PG, PJ, and PK Series pump applications and references Hydro Gear 51161 and 50735. Equipment brand alone is not sufficient to confirm fitment.
What are the signs of a failing hydraulic seal?
The most common sign is hydraulic fluid leakage around the pump shaft. Loss of transmission performance, unusual pump noise, or sluggish hydraulic operation may also indicate a seal or another hydraulic-system problem.
How often should the seal be replaced?
There is no universal replacement interval. Replace the seal when leakage, damage, or wear is found, and consider replacing it during a pump or transmission overhaul when the seal is accessible.
Can I install this seal myself?
Installation may be suitable for an experienced technician with the correct puller, seal driver, and service information. Incorrect alignment or installation force can damage the seal, shaft, or housing, so professional installation is recommended when the pump service procedure is unfamiliar.
Is this an OEM part?
No. This listing is for an aftermarket replacement lip seal. The listed Hydro Gear and Husqvarna numbers are reference numbers used to help compare the replacement with the original part.
How quickly is the order shipped?
Typical international transit is 5–15 days. Standard shipping is free, and expedited options may be available at checkout depending on the destination.
What are the warranty and return terms?
The product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the applicable standard return window when the item is unused and in its original condition. Contact support with your order details for assistance.
Safety & Important Information
- Verify the pump model, original part reference, dimensions, and installation orientation before ordering.
- Do not install a seal if the shaft or housing is excessively worn or damaged without correcting the underlying problem.
- This is an aftermarket replacement and is not an OEM component.
- Follow the equipment and pump manufacturer’s service instructions and use appropriate personal protective equipment.
- Professional installation is recommended when working on pressurized hydraulic systems.
About Sea Sierra
- Pro-Grade Standards — We supply replacement parts selected for dependable performance in real-world equipment applications.
- Fast Global Fulfillment — Free standard delivery is available to most regions, typically within 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising material selection or quality-control practices.
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