Gasket, Hydraulic Pump Cover – Fits Yanmar Marine Engines (Replaces 124240-01883)
Gasket, Hydraulic Pump Cover – Fits Yanmar Marine Engines (Replaces 124240-01883) 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
Free standard shipping on all orders under 1 KG
Gasket, Hydraulic Pump Cover – Fits Yanmar Marine Engines (Replaces...
Product Details
This aftermarket Gasket, Hydraulic Pump Cover – Fits Yanmar Marine Engines (Replaces 124240-01883) ensures a reliable seal for the hydraulic pump on various small to medium Yanmar marine diesel engines, including the GM, JH, 3JH, 4JH, LA, and TNV series. It is designed to meet or exceed OEM specifications for fit and function, preventing fluid leaks and maintaining system pressure.
This part offers a direct interchange for Yanmar part numbers 124240-01880, 124240-01881, 124240-01882, and 124240-01883, as well as Volvo Penta equivalents 842870 and 862583.
- Installs on the engine gear housing to seal the hydraulic pump cover.
- Engineered to prevent leaks and maintain hydraulic system integrity.
- Includes one pump cover gasket for a complete replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 124240-01880 |
| Yanmar | 124240-01881 |
| Yanmar | 124240-01882 |
| Yanmar | 124240-01883 |
| Volvo Penta | 842870 |
| Volvo Penta | 862583 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is confirmed to fit a wide range of Yanmar marine engines. Please verify your specific model is listed.
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Yanmar | 2GM | 4-Stroke | 124240-01883 |
| Yanmar | 2GM20 | 4-Stroke | 124240-01883 |
| Yanmar | 2GM20F | 4-Stroke | 124240-01883 |
| Yanmar | 2GM20F-YEU | 4-Stroke | 124240-01883 |
| Yanmar | 2GM20-YEU | 4-Stroke | 124240-01883 |
| Yanmar | 2GMLP | 4-Stroke | 124240-01883 |
| Yanmar | 3GM | 4-Stroke | 124240-01883 |
| Yanmar | 3GMD | 4-Stroke | 124240-01883 |
| Yanmar | 3GMF | 4-Stroke | 124240-01883 |
| Yanmar | 3GM30 | 4-Stroke | 124240-01883 |
| Yanmar | 3GM30F | 4-Stroke | 124240-01883 |
| Yanmar | 3GM30F-YEU | 4-Stroke | 124240-01883 |
| Yanmar | 3GM30-YEU | 4-Stroke | 124240-01883 |
| Yanmar | 3TNE68-NTB | 4-Stroke | 124240-01883 |
| Yanmar | 3TNE74-AMM | 4-Stroke | 124240-01883 |
| Yanmar | 3TNE74-KBS | 4-Stroke | 124240-01883 |
| Yanmar | JH Series | 4-Stroke | 124240-01883 |
| Yanmar | 3JH Series | 4-Stroke | 124240-01883 |
| Yanmar | 4JH Series | 4-Stroke | 124240-01883 |
| Yanmar | LA Series | 4-Stroke | 124240-01883 |
| Yanmar | TNV Series | 4-Stroke | 124240-01883 |
Technical Specs
- Product Type
- Hydraulic Pump Cover Gasket
- Installation
- Engine Gear Housing
- Housing Material
- Gasket Material (Specific composition not specified)
- Dimensions
- 8.0" L x 8.0" W x 0.1" H
- Other Technical Attributes
- Used to seal pump cover
- Warranty
- Manufacturer's warranty for manufacturing defects
What’s in the Box
- 1 x Gasket, Pump Cover (124240-01883)
Installation Notes
- Ensure the engine is completely cool and turned off. Disconnect the vessel's battery as a safety precaution.
- If necessary, drain the hydraulic fluid to a level below the pump to prevent spills.
- Carefully unbolt and remove the hydraulic pump cover assembly from the gear housing.
- Pry off the old gasket, taking care not to scratch the metal surfaces. Use a plastic scraper if needed.
- Thoroughly clean both the pump cover and the gear housing mating surfaces with a suitable solvent to remove all residue.
- Position the new gasket correctly, aligning it with the bolt holes.
- Re-install the pump cover. Tighten the bolts in a crisscross pattern to the manufacturer's recommended torque specification to ensure even pressure.
- Refill any drained fluids, reconnect the battery, and start the engine.
- Carefully inspect the pump cover for any signs of leakage.
Troubleshooting & FAQ
How do I know if this gasket fits my Yanmar engine?
This gasket fits a broad range of Yanmar models, including GM, JH, and TNV series. Please review the "Engine & Model Compatibility" table on this page and cross-reference your specific engine model and part number to confirm a match.
What are the signs of a failing hydraulic pump cover gasket?
Common symptoms include visible hydraulic fluid leaks around the pump cover, a drop in hydraulic pressure or performance, and an engine bay that is dirtier than usual in the vicinity of the pump due to fluid seepage attracting grime.
Can I reuse my old gasket after removing the pump cover?
No. Gaskets are designed for a single use. They compress and deform to create a seal. Once removed, an old gasket will not provide a reliable seal and is highly likely to leak.
Do I need to apply any sealant or adhesive with this gasket?
Generally, this type of gasket is designed to be installed dry. However, always consult your engine's service manual for specific procedures. If the manual calls for a sealant, use only the recommended type.
Is this part an exact replacement for Volvo Penta 862583?
Yes, this aftermarket gasket is a direct cross-reference for Volvo Penta 862583 and 842870, as well as multiple Yanmar part numbers. It is dimensionally and materially equivalent.
What is the difference between an OEM part and this aftermarket part?
This listing is an aftermarket replacement, not an OEM component. It has been engineered to meet or exceed OEM-level specifications using comparable, high-quality materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure consistency and performance.
How fast is shipping and what does it cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most locations, with expedited options available at checkout where applicable.
What is the warranty and return policy on this part?
This product is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter an issue, please contact our support team with your order details. Unused items in their original condition can be returned within our standard window; see our full policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears on the compatibility list—do not order.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is highly recommended for safety, proper function, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By bypassing traditional distribution channels, we deliver fair pricing without compromising on materials or quality control.
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