What the Lincoln 83668 Is
Lincoln is a trademark of its respective owner. This is an aftermarket pump, not manufactured, sponsored, or endorsed by Lincoln. 83668 designations are for cross-reference identification only. The Lincoln 83668 is a single-stroke air-operated positive displacement pump designed for vertical installation. It works as the pumping unit in single-line centralized lubrication circuits using SL-32 or SL-33 injectors.
The 83668 is a self-contained unit with its own onboard 1 lb (0.45 kg) / 30 cu in (492 cc) acrylic reservoir and spring follower. It is not a drum-mounted pump and does not use follower plates, drum covers, bung adapters, or pail mounting. This compact design fits systems where a larger drum pump is not required.
Specifications
| Part number | 83668 |
| Type | Air-operated positive displacement pump, single-stroke, cycle-based lubrication, vertical installation |
| Output per cycle | 0.45 cu in (7.4 cc) |
| Pump ratio | 20:1 standard, 25:1 variant exists |
| Reservoir | 1 lb (0.45 kg) / 30 cu in (492 cc) acrylic with spring follower |
| Grease operating pressure range | 1,200-3,500 PSI (82-241 bar) |
| Recommended operating pressure | 1,500 PSI (103 bar) |
| Air supply pressure | 60-175 PSI (4-12 bar) |
| Air inlet | 1/4″ NPTF female |
| Lubricant outlet | 1/4″ NPTF female |
| Temperature range | -18°C to +66°C |
| Weight | About 14 lbs (6.4 kg) |
| Grease grades | NLGI 0 to 2 |
How the Air Motor and Ratio Work
The pump operates on a single-stroke cycle. Each cycle is triggered by the air motor, which drives the positive displacement piston to deliver one measured shot of grease. After the stroke completes, the pump resets and waits for the next cycle trigger.
The 20:1 ratio is an air-to-grease pressure multiplication factor, not a volume or gear ratio. The declared 1,200-3,500 PSI grease operating range corresponds to the 60-175 PSI air supply through the 20:1 ratio. A 25:1 variant exists but is not further specified on this page. The recommended operating point is 1,500 PSI (103 bar).
The Onboard Reservoir
The onboard acrylic reservoir holds 1 lb (0.45 kg) or 30 cu in (492 cc) of grease. A spring follower inside the reservoir keeps the grease in contact with the pump inlet as the level drops. This design helps maintain consistent intake during operation.
The clear acrylic body allows a quick visual level check without opening the unit. Refill intervals align with the 7.4 cc delivery per pump cycle. The reservoir accepts grease from NLGI 0 to NLGI 2 grades.
Air Supply and Connections
The air motor requires a supply pressure between 60 and 175 PSI (4-12 bar). The air inlet connection is 1/4″ NPTF female. The lubricant outlet is also 1/4″ NPTF female.
The pump operates within a temperature range of -18°C to +66°C. This makes it suitable for many indoor and sheltered industrial installations. No additional heating or cooling is required within that declared range.
Where This Pump Fits
The 83668 is used as the pumping unit in single-line centralized lubrication circuits with SL-32 or SL-33 injectors. The total lubricant demand per cycle must not exceed the 7.4 cc delivered per pump cycle. Point count depends on injector sizing for the specific circuit.
For related components, see the SL-1 grease injector. You can also review the full air-operated grease pumps range. If you need sizing help, consult the guide to grease pumps. For a direct quotation, use the quotation form.
Frequently Asked Questions
What does the 20:1 ratio mean?
The 20:1 ratio multiplies air pressure into grease pressure. It is not a volume ratio or a gear ratio.
How is the 83668 different from the 84668?
The 84668 is a distinct model with different specifications. This page covers the 83668 only.
Which NLGI grades can this pump handle?
This pump is rated for NLGI 0 through NLGI 2 grease. Use grades within that range only.
What air pressure does the pump need?
The required air supply pressure is 60 to 175 PSI. That equals 4 to 12 bar.
How much grease does the reservoir hold?
The onboard reservoir capacity is 1 lb or 492 cc. It uses an acrylic body with a spring follower.
Which injectors work with this pump?
The pump works with SL-32 and SL-33 injectors in single-line circuits. Those injectors match the declared cycle output.
Can the pump be mounted horizontally?
No, this pump is designed for vertical installation. Mount it upright for correct operation.
What is the output volume per cycle?
The output per cycle is 0.45 cu in, which is 7.4 cc. That is the maximum lubricant demand per cycle.
What is the recommended operating pressure?
The recommended operating pressure is 1,500 PSI, which equals 103 bar. That point is within the declared range.
How do I order or get support?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
You can also request pricing through the quotation form. A support engineer will respond with next steps.
