A1304 Mackay 1780 Dunbier Bearing Buddy (USA) Per Pair | Marine Trailer Part

🔧 Product Description

Genuine Mackay Marine Trailer Products Bearing Buddy USA Spring-Loaded Bearing Protectors – Pair – Part Number: A1304

A genuine USA-made Bearing Buddy pair for standard marine-trailer hubs. Chrome-plated and stainless components provide the original spring-loaded pressure system used to keep grease against the bearings and help resist water entry.

⚙️ Key Features

• Spring-loaded bearing-protector design maintains positive grease pressure
• Helps reduce water entry through the hub seal during launching and retrieval
• Suitable for routine greasing without removing the hub cap
• Supplied as a matched pair for one axle
• Marine-trailer service component

📏 Specifications

• Fitment: Standard LM-style hub family; confirm the press-fit outside diameter
• Press-fit diameter must match the hub bore exactly
• Grease type must be compatible with the existing hub grease
• Do not over-pressurise the hub or force grease past the rear seal

📋 Supplied Components

• 2 × Genuine Bearing Buddy protectors

🔄 Cross Reference & Related Parts

• Dunbier cross reference: 1780
• Economy bearing-protector pair: Mackay A1305-2 / Dunbier 1779
• LandCruiser/heavy-duty Bearing Buddy pair: Mackay A1306 / Dunbier 1781
• Protective PVC covers: Mackay A1307-2 / Dunbier 1782

🚤 Compatibility & Application

• Compatible trailer hubs with the exact protector press-fit diameter
• Measure the hub bore rather than relying only on axle size
• Install squarely without striking or distorting the spring piston
• Inspect and service wheel bearings independently; a protector does not repair damaged bearings

🔌 Function

Maintains a slight spring-loaded grease pressure inside the hub to help exclude water and keep the wheel bearings lubricated.

⚠️ Common Signs of Failure

• Protector is loose in the hub bore
• Spring piston is seized or will not accept grease
• Grease or water leaks around the protector
• Cover is missing and contamination builds around the piston
• Hub continues to take excessive grease because the rear seal has failed

📦 Condition

• Genuine Mackay Marine Trailer Products part
• Brand new
• Supplied in original or equivalent packaging