Aftermarket Air-Operated Grease Pumps for Graco Fire-Ball Series Cross-Reference
These aftermarket pumps replace core Graco Fire-Ball 300, Fire-Ball 425, and LD family models. Graco and Fire-Ball are trademarks of their respective owner. These are aftermarket pumps, not manufactured, sponsored, or endorsed by Graco. Graco series designations are for cross-reference identification only.
How an Air-Operated Grease Pump Works
An air-operated grease pump uses a reciprocating air motor to drive a grease displacement rod. The ratio number describes the area difference between the air piston and the grease piston. When a grease gun or valve closes, the pump stalls and holds pressure without cycling.
Choosing the correct grease pump depends on the outlet pressure required at the furthest grease fitting. The ratio rule is simple: outlet pressure is roughly air inlet pressure times the ratio, minus line losses. Confirm line losses before ordering for long hose runs. A complete guide to grease pump selection can help avoid undersizing.
Fire-Ball 300 Aftermarket Models
| Model | Ratio | Max Pressure | Flow | Displacement | Cycle Rate | Air Consumption | Air Inlet | Fluid Outlet | Weight |
| Fire-Ball 300 15:1 | 15:1 | 2,190 psi (151 bar) | 7.5 lb/min (3.4 kg/min) | 485 ml per cycle | 20-60 cpm | 18 scfm at 100 psi | 40-125 psi (3-9 bar) | 3/8 inch NPTF | 42 lb (19 kg) |
| Fire-Ball 300 50:1 | 50:1 | 7,500 psi (517 bar) | 0.33 gpm (1.3 lpm) | 162 ml | 15-45 cpm | 13 scfm | 60-150 psi (4-10 bar) | 1/4 inch NPTF | 38 lb (17.2 kg) |
| Fire-Ball 300 75:1 | 75:1 | 7,500 psi | 0.33 gpm | 109 ml | 15-40 cpm | 15 scfm | 60-180 psi (4-12 bar) | 1/4 inch NPTF | 38 lb |
The Fire-Ball 300 15:1 model fits 120 lb and 400 lb drums with a 2 inch bung. Its piston stroke is 6 in (152 mm) and it delivers 7.8 cycles per gallon. The 50:1 model has 23.3 cycles per gallon. The 75:1 model has 34.7 cycles per gallon.
Fire-Ball 425 and LD Aftermarket Models
| Model | Ratio | Max Pressure | Flow | Displacement | Cycle Rate | Air Consumption | Air Inlet | Fluid Outlet | Weight |
| Fire-Ball 425 10:1 | 10:1 | 1,800 psi (124 bar) | 5.2 gpm (19.7 lpm) | 3,550 ml | 25-60 cpm | 26 scfm | 40-120 psi (3-8 bar) | 1/2 inch NPTF | 65 lb (29.5 kg) |
| Fire-Ball 425 50:1 | 50:1 | 7,500 psi | 0.5 gpm (1.9 lpm) | 710 ml | 20-50 cpm | 18 scfm | 60-150 psi | 3/8 inch NPTF | 58 lb (26.3 kg) |
| LD 50:1 | 50:1 | 7,500 psi (517 bar) | 0.582 kg/min at 60 cpm | 9.7 g (0.34 oz) per cycle | 30-60 cpm | 1.2 scfm at 60 cpm | 60-120 psi (4-8 bar) | 1/4 inch NPTF or BSPP | 15 lb (6.8 kg) |
The Fire-Ball 425 10:1 model has a stroke of 8 in (203 mm) and 1.1 cycles per gallon. The Fire-Ball 425 50:1 model has 5.3 cycles per gallon. The LD 50:1 model has a stroke of 4 in (102 mm), handles drums 30 to 110 kg, and mounts directly on a 2 inch bung.
Choosing a Pressure Ratio
Typical application pressures guide selection. Grease gun filling needs 500 to 1,200 psi. Automotive chassis lubrication uses 1,500 to 2,500 psi. Industrial bearing greasing requires 3,000 to 5,000 psi. Heavy equipment pins and bushings need 5,000 to 7,500 psi.
Hose loss at 1 gpm per 100 ft is about 50 psi for 3/8 inch ID, about 200 psi for 1/4 inch ID, and about 800 psi for 1/8 inch ID. Use 10:1 or 15:1 for bulk transfer and gun filling. Use 15:1 or 50:1 for general maintenance. Use 50:1 for heavy industrial. Use 75:1 for maximum pressure work.
For heavy equipment tasks, a heavy equipment lubrication system should account for hose length and fitting restrictions. The pump must overcome both the fitting pressure and the line loss at the required flow. Confirm your total pressure requirement before ordering.
What to Confirm Before Ordering
These pumps include a cast aluminum air motor housing and a hard-chrome plated displacement rod. Grease compatibility is NLGI 000 through NLGI 2. Confirm your grease thickener type and base oil viscosity before ordering. Confirm drum size and bung thread before ordering.
Confirm your shop air pressure and available scfm before ordering. The Fire-Ball 425 10:1 requires 26 scfm, which may exceed small compressor output. Confirm hose length, ID, and fitting size before ordering. Confirm the required outlet pressure at the furthest point before ordering.
Replacements are built for direct fitment in existing Fire-Ball 300, 425, and LD mounting positions. If your drum follower or pump mounting plate differs from the listed models, confirm dimensions before ordering. For a written quotation, contact the team with your pump model and ratio.
Frequently Asked Questions
What is the difference between the Fire-Ball 300 and Fire-Ball 425 frames?
The 425 frame moves more grease per cycle and weighs more than the 300 frame. The 425 10:1 model is intended for high-flow transfer.
Which ratio should I choose for a long hose reel?
Long hose reels add friction loss that reduces pressure at the outlet end. Add the hose loss value for your length and ID to the fitting pressure.
Is a 15:1 pump enough for NLGI 2 grease?
A 15:1 pump can move NLGI 2 grease for short lines and warm conditions. Cold weather or long runs may require a higher ratio.
Does a higher ratio increase flow or pressure?
A higher ratio increases available outlet pressure at a given air inlet pressure. Higher ratio pumps typically deliver less flow per cycle.
Can these pumps fill drums as well as feed a grease gun?
A 10:1 or 15:1 pump handles bulk transfer and grease gun filling well. A 50:1 pump can feed a gun but transfers drums slowly.
What is the LD 50:1 use case?
The LD 50:1 pump suits direct drum mounting on small to medium drums. It delivers low flow at high pressure for central grease points.
What air supply is needed for these pumps?
The LD 50:1 needs 1.2 scfm at 60 cpm. The Fire-Ball 300 15:1 needs 18 scfm at 100 psi.
Will these pumps over-pressurize my grease hose?
Every pump can reach its stated maximum pressure at stall. Choose a hose rated above the pump maximum outlet pressure.
How many grease guns can run at once?
The number of guns depends on pump flow and the cycle rate at each gun. Confirm total gun flow demand before ordering a pump.
Who builds these pumps, and how do I get a quotation?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
Contact the team with your pump model and ratio.
