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

🔧 Product Description

Dunbier Bearing Buddy USA Bearing Protectors - Standard Pair - Part Number: 1780

A spring-loaded grease reservoir and hub protector set for compatible standard hubs. The moving piston maintains light positive grease pressure as the hub cools after immersion, helping reduce the tendency for water to be drawn past the inner seal.

⚙️ Key Features

• Spring-loaded grease-pressure piston

• Grease nipple allows replenishment without removing the hub

• Pair services one axle

• Protective plated or manufacturer finish

• Useful for boat trailers exposed to repeated immersion

📏 Specifications

• Compatibility: compatible standard hubs

• Reference: Mackay A1304 / genuine Bearing Buddy family

• Quantity: Pair

• Press-fit hub-bore dimensions must match exactly

• Does not replace the need for correctly adjusted bearings and sound inner seals

🔄 Cross Reference & Related Parts

• Dunbier: 1780

• Related PVC protector covers: Dunbier 1782

• Dust-cap alternative: Dunbier 1740/1740P

• Use only a protector with the correct measured hub bore

🚤 Trailer Compatibility & Application

• Suits compatible standard hubs

• Compatible with braked or non-braked hubs only where the cap bore and internal clearance match

• The LandCruiser and Trojan versions are not direct substitutes for standard hub protectors

🔌 Function

Maintains a small reserve of grease and slight positive pressure at the outer hub to help protect bearings from water entry.

Common signs of wear or replacement:

• Protector is loose in the hub bore

• Piston remains fully extended or will not move

• Grease leaks excessively around the outer edge

• Grease nipple is blocked or damaged

• Corrosion, dents or spring failure

🛠️ Installation & Safety

• Measure the clean hub bore before fitting

• Drive the protector in squarely using a suitable block or driver

• Fill gradually until the piston reaches the indicated operating position

• Do not over-pressurise the hub, which can force grease past the inner seal

• Inspect and service wheel bearings at normal intervals

📦 Condition

• Genuine Dunbier Marine Products trailer component

• Brand new

• Supplied as one pair of bearing protectors

• Supplied in original or equivalent packaging