Sierra Gear Lube Pump 18-9779, Replaces Mercury 91-74057Q6, Fits Standard and Wide Mouth Bottles

The Sierra Gear Lube Pump 18-9779 is a universal hand pump designed to make gear lube changes clean and simple, whether you are servicing an outboard lower unit, a sterndrive, or any gear case that takes bottled gear lubricant. It threads onto the bottle itself, letting you pump lube directly into the fill hole without messing with squeeze tubes or funnels, which keeps the job neater and reduces spills in the process.

This pump is built to work with both standard and wide mouth gear lube bottles, so it is not tied to one bottle size or brand. It comes with a set of adapters covering all major outboard engine manufacturers, which means one pump can handle a wide range of gear lube bottle threads you are likely to encounter in the shop or on the dock. The pump body and fittings are constructed from aluminum for durability and long service life, standing up to repeated use and exposure to gear lube and marine environments better than lower-grade plastic pumps.

Sierra ships the 18-9779 display packaged, making it a straightforward addition to a service counter or tool bench. It is a practical accessory for any marine technician, boat owner, or shop that regularly performs gear lube changes and wants a reusable, adapter-equipped pump instead of disposable pour spouts.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-9779
• Product Type: Gear Lube Pump
• Bottle Compatibility: Standard and wide mouth bottles
• Included Adapters: Fits all major outboard engine manufacturers
• Fitting Material: Aluminum
• Packaging: Display packaged
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 1 pound
• UPC: 808282375706

Fitment

Universal gear lube pump with adapters for use across all major outboard engine manufacturers; not limited to a single make or model.

Replaces (OEM)

• Mercury 91-74057Q6

Frequently Asked Questions

What is the Sierra 18-9779 used for? It is a gear lube pump that threads onto a bottle of gear lubricant and lets you pump the lube directly into an outboard or sterndrive gear case fill hole, avoiding spills and messy pour spouts.

Will this pump fit any gear lube bottle? The 18-9779 is designed to work with both standard and wide mouth gear lube bottles, and it includes adapters covering all major outboard engine manufacturers, so it fits a wide range of bottle threads without needing a separate pump for each brand.

Does the 18-9779 come with adapters? Yes, adapters for all major outboard engine manufacturers are included with the Sierra Gear Lube Pump 18-9779, so you can switch between different gear lube bottle brands using the same pump.

What is the Sierra 18-9779 made of? The pump features aluminum fittings for durability, which is intended to give it a longer service life than pumps built with lower-grade materials.

Is the Sierra 18-9779 an OEM equivalent to a Mercury part? Yes, the Sierra 18-9779 gear lube pump replaces Mercury part number 91-74057Q6 and performs the same function of transferring gear lube from a bottle into a gear case.

How much does the Sierra Gear Lube Pump weigh? The Sierra 18-9779 gear lube pump weighs 1 pound.

What are the dimensions of the 18-9779 gear lube pump? The product measures 0.39 x 0.39 x 0.39 inches.

How does the Sierra 18-9779 come packaged? The 18-9779 ships display packaged, making it easy to hang or shelve at a service counter or shop.

Can the same 18-9779 pump be reused across different jobs? Yes, because the pump includes adapters for all major outboard engine manufacturers and fits both standard and wide mouth bottles, the same 18-9779 unit can be reused across gear lube changes on different engines rather than needing a dedicated pump per brand.

What is the UPC for the Sierra 18-9779 Gear Lube Pump? The UPC for the Sierra Gear Lube Pump, part number 18-9779, is 808282375706.