Twin Disc MG-514B Marine Transmission Parts for Australia - Bearing Kit Section

Twin Disc MG514B Marine Transmission Parts – Bearing Kit Catalog

The Twin Disc MG514B marine transmission is built for dependable power transfer in demanding commercial and industrial marine environments. Designed to handle high torque loads while maintaining precise gear engagement, the MG514B is a staple in workboats, ferries, fishing vessels, and other heavy-duty applications. To preserve its performance, regular maintenance with high-quality replacement parts is essential.

This section of the catalog highlights the bearing kit, gasket and seal kit, and related service components that support complete rebuilds and long-term reliability for both MG514A and MG514B transmissions. Each part listed is specifically engineered for Twin Disc specifications, ensuring durability, perfect fit, and smooth operation even under harsh marine conditions.

Bearing Kit for Twin Disc MG514A & MG514B Marine Transmissions

The bearing kit for the MG514A and MG514B marine transmissions provides every precision bearing required to support the internal shafts and gear assemblies. These components are the backbone of the gearbox, ensuring consistent alignment, reduced vibration, and optimal oil circulation.

• Compatibility: Designed for both MG514A and MG514B models.

• Purpose: Replaces all major internal bearings that carry torque and maintain shaft alignment.

• Durability: Engineered from high-strength bearing steel, heat-treated for marine endurance.

• Performance: Reduces internal friction, ensures smooth gear rotation, and extends the life of clutches and gears.

When the bearings inside a Twin Disc transmission begin to wear, operators may notice increased noise, vibration, or slipping during gear engagement. Installing a complete bearing kit restores factory tolerances, helping the gearbox run quietly and efficiently. This rebuild solution is ideal for fleet operators seeking consistent performance and reliability across multiple vessels.

Twin Disc MG514 Ring Drive

The ring drive is a key component that connects the MG514 transmission to the engine’s flywheel housing, ensuring torque transfer without misalignment.

• Application: Fits Twin Disc MG514A, MG514B, and MG514C transmissions.

• Specification: Sized for SAE #1 housing.

• Function: Provides a secure coupling between the transmission and the engine, maintaining stability under high torque.

A new ring drive ensures that the input shaft remains properly aligned, reducing stress on internal bearings and preventing premature wear. Replacing it during a rebuild is a proactive measure that enhances both performance and longevity.

Gasket and Seal Kit for Twin Disc MG514A & MG514B

The gasket and seal kit is an essential part of any complete transmission service. Designed for a perfect fit within the MG514A and MG514B gear housings, this kit includes all seals and gaskets necessary to restore the transmission’s oil-tight integrity.

• Applications: Compatible with both MG514A and MG514B gearboxes.

• Contents: Includes input and output shaft seals, O-rings, and case gaskets.

• Material Quality: Constructed from marine-grade, oil- and heat-resistant elastomers and composite gasket materials.

• Benefits: Prevents oil leaks, blocks contaminants, and protects against saltwater corrosion.

Even minor leaks can reduce transmission oil pressure, leading to increased friction and potential gear damage. By installing a fresh set of gaskets and seals during a bearing replacement, you can ensure long-term reliability and improved performance under demanding marine operating conditions.

Oil Filter for Twin Disc MG514B

The oil filter plays a vital role in maintaining lubrication quality within the MG514B transmission. It captures contaminants, preventing them from circulating through bearings and clutch assemblies.

• Application: Designed specifically for the MG514B model.

• Function: Filters oil to prevent debris buildup and ensure consistent hydraulic pressure.

• Maintenance Tip: Regular oil and filter changes extend the service life of all internal parts, especially bearings and seals.

A clean oil system ensures efficient cooling and minimizes frictional wear — two critical factors in the longevity of any marine gearbox.

Spring for Twin Disc MG514 Marine Transmission

This spring supports clutch actuation inside the transmission, maintaining proper pressure for smooth gear engagement.

• Purpose: Ensures precise clutch function during shifting.

• Importance: Worn springs can cause engagement lag or uneven clutch application.

Although small, this part is crucial to ensuring reliable shifting performance and consistent power transfer under load.

Sleeve for Twin Disc MG514 Marine Transmission

The sleeve provides accurate support for internal shafts, maintaining alignment and preventing uneven wear inside the gearbox.

• Material: Made of precision-machined, hardened steel.

• Role: Prevents scoring of shafts and bearing surfaces, protecting against misalignment.

• Maintenance Tip: Replace during bearing service to maintain smooth operation and correct tolerances.

Rubber Block for Twin Disc Marine Gears

The rubber block acts as a vibration isolator, reducing mechanical stress between the transmission and drive assembly.

• Compatibility: Fits multiple Twin Disc models including MG5111, MG5111A, MG5114, MG5114A, MG514A/B/C, MG516, MG518, MG521, and MG527.

• Function: Absorbs torque shocks and dampens vibration.

• Material: Constructed from durable, oil-resistant marine rubber compounds.

Replacing these blocks during a rebuild helps ensure quiet, stable operation and minimizes transmission wear caused by drivetrain vibration.

Why Buy from Diesel Pro Power

Diesel Pro Power is the world’s most trusted source for Twin Disc marine transmission parts, serving over 40,000 satisfied customers across 180 countries. From complete bearing kits to seals, sleeves, and vibration dampers, every product is backed by unmatched quality and service.

Here’s why marine professionals choose Diesel Pro Power:

• Comprehensive Inventory: Everything you need for the MG514A and MG514B transmissions — all in one place.

• Unmatched Quality: All components meet or exceed OEM performance standards.

• Fast Global Shipping: Quick, reliable delivery to shipyards and ports worldwide.

• Expert Guidance: Knowledgeable staff to ensure you get the correct parts for your model.

• Proven Reliability: Trusted by mechanics, captains, and fleet operators for decades.

When it’s time to rebuild or service your Twin Disc MG514A or MG514B transmission, depend on Diesel Pro Power for precision-fit parts that restore factory performance and deliver long-term dependability on the water.