What is an Air Grease Pump?
A pneumatic positive-displacement pump that moves grease from a sealed drum or pail using plant compressed air—ideal for workshops, mines, and construction depots where electrical pumps are impractical.
Explore grease pump types or read the complete selection guide. Browse 50:1 kits in the product grid below.
Types of Air Grease Pumps Available at ISOHITECH
Our drum-mounted air grease pumps connect to standard grease containers. This forms efficient closed systems that deliver reliable lubrication. These models include:
- 55-Gallon (200L) Drum Systems: These systems are built for heavy-duty use. They serve facilities that need a lot of lubrication.
- 16-Gallon (60L) Medium Drums: Ideal for maintenance workshops and medium-sized operations.
- 5-Gallon (20 L) Compact Systems: Perfect for smaller applications or mobile maintenance teams.
Each system has a well-designed follower plate. This stops air pockets and ensures that all the grease is used.
Our mobile grease pump systems offer flexibility for maintenance crews. They can easily service multiple locations.
- Cart-mounted units feature heavy-duty wheels and ergonomic handles for easy transportation.
- Portable Workshop Systems: Compact and lightweight for technicians servicing various equipment.
- Mobile Service Packages: Complete with high-pressure hoses and control valves for field maintenance.
For applications requiring exceptional pressure delivery:
- 50:1 Ratio High-Pressure Pumps: Provide up to 7,500 PSI for tough industrial tasks.
- 60:1 and 70:1 Extreme-Pressure Models: Made for tough lubrication needs.
- Mining-Grade Systems: Featuring corrosion-resistant components for harsh environments.
Industrial Applications for Air Grease Pumps
ISOHITECH air grease pumps provide reliable lubrication for:
- Automated production equipment requires consistent maintenance.
- CNC machine tool-bearing systems
- Conveyor systems and material-handling equipment
- Heavy industrial presses and forming machines
Our rugged pumps are trusted for:
- Excavator and loader pivot point lubrication.
- Crane and lifting equipment maintenance
- Concrete pumping equipment
- Compaction machinery service intervals
SOHITECH provides specialized mining-grade air pumps for:
- Underground mining equipment operates in harsh conditions.
- Conveyor transfer points and drive mechanisms
- Crushing and screening equipment with high-stress bearings.
- Heavy-duty off-road vehicle maintenance
Our agricultural solutions include:
- Tractor and harvester maintenance systems
- Irrigation equipment lubrication
- Seasonal equipment service packages
- Field maintenance kits for remote operations
Why Choose ISOHITECH for Your Air Grease Pump Needs
With years of experience providing lubrication solutions across industries, ISOHITECH offers:
- Technical Expertise: Our specialists help select the optimal system for your application.
- Comprehensive Support: From installation assistance to maintenance guidance.
- Custom Solutions: Tailored systems for unique requirements
- Competitive Pricing: Outstanding value without compromising quality
- Fast Shipping: Quick delivery to minimize your downtime.
- Extensive Warranty: Peace of mind with our industry-leading warranty coverage.
Contact us today to talk about your air grease pump needs. Learn how ISOHITECH can improve your maintenance with reliable and efficient lubrication solutions.
Isohitech Air Grease Pump
- Ratio: 50:1 (100 PSI → 5,000 PSI output)
- Flow: 0.5–1.5 lb/min (adjustable)
- Grease: NLGI #1 & #2
- Air Use: 5–8 CFM @ 100 PSI
- Capacity: 35 lb pails (includes follower plate)
- Build: Aluminum body + stainless steel piston
- Hose: 10 ft high-pressure
- Safety: Pressure relief valve
- Weight: 28 lbs (Portable)
- Ratio: 50:1 air motor
- Max Pump Pressure: 7,500 PSI / 517 BAR
- Max Gun Pressure: 10,000 PSI / 689 BAR (via B2 Booster Gun)
- Flow Rate: 16 oz/min (460 g/min)
- Capacity: Designed for 120 lb/55 kg containers
- Hose: 13 ft (4m) high-pressure grease hose
- Air Consumption: 3 CFM @ 150 PSI
- Warranty: Industry-leading 10-year warranty
- Materials: Zinc components (mining applications), chrome-plated steel, polyurethane rubber
- Included:
- B2 Booster Gun with ZSB swivel
- Rubber-edged follower plate (prevents contamination)
- Heavy-duty trolley with wheels
- Features:
- Quiet air motor (no lubricant required)
- Fully repairable design
- Built-in grease strainer
- Compatible with NLGI #2 grease
- Ratio: 50:1 air motor
- Max Pump Pressure: 7,500 PSI / 517 BAR
- Max Gun Pressure: 10,000 PSI / 689 BAR (via B2 Booster Gun)
- Flow Rate: 16 oz/min (460 g/min)
- Capacity: Designed for 400 lb/180 kg (55 Gal.) containers
- Hose: 8 ft (2.5m) high-pressure grease hose
- Air Consumption: 3 CFM @ 150 PSI
- Materials: Zinc components (mining applications), chrome-plated steel, polyurethane rubber
- Included:
- B2 Booster Gun with 360° ZSB swivel
- Rubber-edged follower plate (prevents contamination)
- Features:
- Quiet air motor (no lubricant required)
- Fully repairable design
- Built-in grease strainer for clean delivery
- Compatible with NLGI #2 grease
- Capacity: For 5-gallon pails (30 lb containers)
- Ratio: 50:1 air motor
- Flow Rate: 1.76 lb/min (high-efficiency)
- Max Pressure: 7,250 PSI
- Air Consumption: 3.6 CFM @ 150 PSI
- Grease Compatibility: NLGI #2
- Weight: 9.5 lbs (lightweight design)
- Ports: ¼” FNPT air inlet / ¼” MNPT outlet
- Note: Bare pump only (no hose, follower plate, or booster gun included)
- Capacity: Designed for 120 lb/16-gallon kegs
- Ratio: 50:1 air motor
- Flow Rate: 1.76 lb/min (high-efficiency)
- Max Pressure: 7,250 PSI
- Air Consumption: 3.6 CFM @ 150 PSI
- Grease Compatibility: NLGI #2
- Weight: 12.5 lbs (industrial-grade)
- Suction Tube: 29 1/8” length (optimized for kegs)
- Ports: ¼” FNPT air inlet / ¼” MNPT outlet
- Note: Bare pump only (no hose, follower plate, or booster gun included)
- Capacity: For 400 lb/55-gallon drums
- Ratio: 50:1 air motor
- Flow Rate: 1.76 lb/min (high-efficiency transfer)
- Max Pressure: 7,250 PSI
- Air Consumption: 3.6 CFM @ 150 PSI
- Grease Compatibility: NLGI #2
- Weight: 14 lbs (heavy-duty construction)
- Suction Tube: 37” length (optimized for drum access)
- Ports: ¼” FNPT air inlet / ¼” MNPT outlet
- Note: Bare pump only (no hose, follower plate, or booster gun)
- Ratio: 75:1 air motor (higher pressure vs. 50:1 models)
- Max Pressure: 13,000 PSI (industrial-grade)
- Flow Rate: 3.5 lb/min (high-volume output)
- Capacity: Fits 5–6.5-gallon pails and 35–60 lb containers
- Air Consumption: 11.7 CFM @ 115 PSI
- Suction Tube: 19” length, 1.25” diameter
- Ports: ¼” FNPT air inlet / ⅜” FNPT outlet
- Weight: 19.4 lbs (heavy-duty construction)
- Note: Bare pump only (no hose, follower plate, or booster gun)
- Ratio: 58:1 air motor
- Max Pressure: 8,700 PSI (59,900 kPa)
- Flow Rate: 13 lb/min (high-volume output)
- Capacity: Designed for 400 lb/180 kg drums
- Air Consumption: 23.5 SCFM @ 120 PSI
- Weight: 28.6 lbs (13 kg)
- Ports: ¼” NPT air inlet / ⅜” NPT outlet
- Included: Air lubricator, built-in grease strainer
- Ratio: 50:1 air motor
- Max Pressure: 7,500 PSI (517 BAR)
- Flow Rate: 16 oz/min (≈1 lb/min)
- Capacity: Optimized for 120 lb/16-gallon containers
- Air Consumption: 3 CFM @ 60–150 PSI (energy-efficient)
- Materials:
- Zinc components (mining-grade corrosion resistance)
- Hard chrome-plated carbon steel piston
- Nitrile/PU seals
- Weight: Lighter than drum-specific models (exact weight not specified)
- Ratio: 50:1 air motor
- Max Pressure: 7,500 PSI (517 BAR)
- Flow Rate: 16 oz/min (≈1 lb/min)
- Capacity: Designed for 400 lb/55-gallon drums
- Air Consumption: 3 CFM @ 60–150 PSI (energy-efficient)
- Zinc components (corrosion-resistant for mining)
- Hard chrome-plated carbon steel piston
- Nitrile/PU seals (grease-compatible)
- Ports: ¼” NPT air inlet / ¼” NPT outlet
- Ratio: 58:1 air motor
- Max Pressure: 8,700 PSI (59,900 kPa) via B2 Booster Gun
- Flow Rate: 13 lb/min (high-volume free flow)
- Capacity: Designed for 400 lb/180 kg drums
- Air Consumption: 23.5 SCFM @ 120 PSI
- Noise Level: 85 dB(A) @ 120 PSI (quiet operation)
- Included:
- Booster Gun with 360° ZSB Swivel
- 8 ft high-pressure grease hose
- Lid and follower plate
- Ratio: 50:1 air motor
- Max Pressure: 7,500 PSI (at booster gun)
- Flow Rate: 1.76 lb/min (mid-range output)
- Capacity: Fits 5-gallon pails (35–60 lb containers)
- Air Consumption: 3.6 CFM @ 150 PSI
- Ports: ¼” NPTF air inlet / ¼” NPTM outlet
- Suction Tube: 19” length, 1-3/16” diameter
- Ratio: 50:1 air motor
- Max Pressure: 7,500 PSI (at booster gun)
- Flow Rate: 1.76 lb/min (consistent mid-range output)
- Capacity: Designed for 16-gallon drums (110–132 lb containers)
- Air Consumption: 3.6 CFM @ 150 PSI (energy-efficient)
- Ports: ¼” NPTF air inlet / ¼” NPTM outlet
- Suction Tube: 29 ⅛” length, 1-3/16” diameter
- Ratio: 50:1 air motor
- Max Pressure: 7,500 PSI (via booster gun)
- Flow Rate: 1.76 lb/min (consistent mid-range output)
- Capacity: Designed for 55-gallon drums (400–484 lb containers)
- Air Consumption: 3.6 CFM @ 150 PSI (energy-efficient)
- Ports: ¼” NPTF air inlet / ¼” NPTM outlet
- Suction Tube: 37” length (optimized for drum depth)
How Air Grease Pumps Work
A pneumatic grease pump converts compressed-air energy into reciprocating mechanical stroke. Each cycle draws grease from a pail or drum through a suction tube, pressurizes it in the pump head, and discharges through a check valve to the outlet port. Outlet pressure scales with the air-to-grease ratio: a 50:1 pump at 6.9 bar (100 psi) air supply can reach roughly 34.5 MPa (5,000 psi) grease line pressure before relief—enough for long hoses and NLGI #2 at typical shop temperatures.
Air grease pumps are transfer and dispensing tools, not metered centralized pumps. Pair them with hose reels and control-handle guns for PM routes, or feed a header that supplies progressive blocks or injector manifolds when a plant needs fixed shot volumes.
Core BOM Components
| Component | Function | Typical spec |
|---|---|---|
| Air motor + pump tube | Ratio-defined pressure boost | 50:1, 58:1, 75:1 |
| Follower plate | Seals drum head; prevents air ingestion | Rubber edge for 16–55 gal |
| High-pressure hose | Flexible line to gun or reel | ¼”–⅜” ID, rated > pump max |
| Booster / control gun | On-demand shot at fitting | Swivel Zerk head |
| Air FRL | Filter, regulator, lubricator (if required) | Clean dry air 4–8 bar |
| Relief valve | Limits over-pressure | On pump or gun circuit |
Pressure Ratios: 50:1 vs 55:1 vs 75:1
| Ratio | Typical air in | Approx. grease out | Best for |
|---|---|---|---|
| 50:1 | 6–8 bar | 30–40 MPa | General shop, NLGI #1–#2, hoses to 15 m |
| 55:1 | 6–8 bar | 35–45 MPa | Cold grease, longer runs, mining field kits |
| 75:1 | 7–8 bar | 50+ MPa | Very viscous grease, small line ID, high back-pressure |
Ratio sets pressure, not volume. Flow (lb/min or g/min) depends on pump displacement per stroke and stroke rate. High-volume 58:1 skids on this page trade ratio for larger bore—use when filling many points quickly, not when pushing #2 grease through 30 m of ¼” hose in winter.
Drum Size and Mounting Styles
- 5 gal / 20 L pail — portable PM cart, excavator service bays
- 16 gal / 60 L keg — medium workshops, construction depots
- 55 gal / 200 L drum — mine maintenance, fleet lube rooms
- Bare pump head — retrofit existing lid/follower; specify suction tube length
- Cart + reel kit — multi-machine routes without moving the drum
Product cards in Section5 list IsoHiTech 50:1 bare pumps and complete kits—match suction tube length to your container depth before ordering.
Selection Checklist
- Grease grade — NLGI #1 flows easier in cold; #2 is standard for pins and bearings
- Furthest point + hose length — pressure drop rises with length, fittings, and temperature
- Air supply — stable 4–8 bar, 3–12 CFM depending on model; add FRL upstream
- Duty cycle — intermittent gun use vs continuous transfer to a header
- Environment — zinc or stainless wetted parts for wet/mine duty
- Integration — transfer only, or feed electric auto grease pump reservoir periodically
Installation Notes
Mount the drum vertically on a level pad; seat the follower plate flush to the grease surface before the first run. Route hoses with gradual bends—kinks mimic blockages and raise header pressure. Ground metal drums in solvent or fuel areas; keep air lines off the floor to avoid water ingestion at the FRL.
For centralized plants, place the drum skid near the distribution header to shorten high-pressure runs. Log air pressure and shots per PM week; drifting pressure often indicates follower seal wear or grease channeling in the drum.
Troubleshooting
| Symptom | Likely cause | Action |
|---|---|---|
| No pressure build | Low air, iced FRL, worn motor seals | Verify regulator setting; inspect motor; check for air leaks |
| Slow flow / stalls | Grease too stiff, short suction tube, air pocket under plate | Warm grease per OEM limits; re-seat follower; confirm NLGI grade |
| Gun leaks at fitting | Worn coupler, misaligned Zerk | Replace coupler; clean fitting; do not over-torque |
| Foam or spit at outlet | Air ingested past follower | Replace follower seal; avoid running drum nearly empty without plate adjustment |
| Excess heat at hose | Continuous stall against blocked line | Stop cycle; clear blockage; confirm relief valve function |
Related IsoHiTech Resources
- Grease pump hub — manual, electric, and pneumatic comparison
- Lubrication grease pump — system-level overview
- Barrel grease pump — electric barrel alternatives
- Construction equipment lubrication — field PM patterns
- Air-powered grease pump category — full catalog
- How pneumatic grease pumps work
Before you buy: read our complete guide to grease pumps.
Frequently Asked Questions
Air grease pumps transfer NLGI #1–#2 grease from pails and drums to hose reels, booster guns, and fittings—common in mining, construction, and heavy equipment PM bays. They also refill reservoirs on small injector-style plants.
50:1 is the air-to-grease pressure ratio: inlet air pressure is multiplied roughly fifty times at the grease outlet (e.g. 100 psi air → about 5,000 psi grease). It does not define flow rate; displacement per stroke and stroke speed set volume.
Choose 50:1 for general NLGI #1–#2, moderate hose lengths, and shop temperatures. Choose 75:1 when pushing thicker grease, using smaller hose ID, or overcoming high back-pressure in cold environments. Verify air CFM rating rises on high-ratio motors.
They can supply a header or refill a day tank, but metering requires progressive distributors or injectors. For timed automatic cycles, pair with an electric auto grease pump or controller.
Models on this page cover 5 gal (20 L) pails, 16 gal (60 L) kegs, and 55 gal (200 L) drums. Bare heads list suction tube lengths—match depth to your container so the foot valve stays submerged.
Most 50:1 units operate at 4–8 bar (60–120 psi) with 3–12 CFM depending on model. Use a filtered, regulated supply (FRL). Low or wet air causes slow stroking, icing, or motor wear.
The follower plate seals the drum head and bears on the grease surface, preventing a air channel that causes cavitation, foam, and inconsistent shots. Rubber-edged plates also keep contaminants out of open drums in dusty sites.
Manual lever guns suit occasional shots. Air pumps move high volumes with less fatigue—better for fleet PM, long hose reels, and refilling multiple machines per shift. Manual remains a sensible backup.
These pumps are sized for grease packing and NLGI consistency. Light oil transfer needs lower-viscosity pump geometry and seal sets—use dedicated oil systems or oil-transfer pumps instead of forcing grease pumps on oil service.
Check for an empty drum, blocked suction tube, hardened grease channel, or a lifted follower plate. Cold NLGI #2 may need approved warming. Inspect the foot valve and strainer before replacing the air motor.
Daily: verify air pressure and quick visual leak check. Weekly: inspect hose and coupler wear. Monthly: clean strainer, check follower seal. Annually: replace worn seals, hose, and motor consumables per the product manual.
Wear eye and hand protection; relieve hose pressure before disconnecting fittings. Use grounded drums where required; never bypass relief valves. Do not exceed rated grease pressure—split long runs or raise ratio instead of disabling protection.