This guide explains what a grease pump kit contains, which specifications matter when comparing kits, and how to install and maintain a complete drum-mounted dispensing package.
Related: complete guide to grease pumps · industrial oil pumps · types of grease pumps
1. What is a grease pump kit and when do you need one?
A grease pump kit is a ready-to-operate assembly combining everything needed to dispense grease from a bulk container: pump unit, follower plate, drum cover, high-pressure hose, dispensing gun with coupler, and usually an air regulator or FRL unit and a wheeled trolley — a matched, tested set instead of separately sourced components with mismatch risk.
You need a kit rather than a bare pump when setting up a new lubrication station, equipping a service truck, or standardizing PM routes across a fleet: a complete kit converts a 20 kg or 55-gallon container into a high-pressure dispensing system in under an hour. For the broader picture of pump types, see the grease pump hub.
2. Key specifications to compare
Pressure ratio is the headline number. Pneumatic kits are defined by their air-to-grease ratio. A 50:1 pump at 8 bar air produces approximately 400 bar (5,800 PSI) grease output; a 60:1 pump at 10 bar air reaches about 690 bar (10,000 PSI). Practical delivery is typically 85–92% of theoretical due to mechanical and seal losses, and hose friction subtracts roughly 0.3–0.8 bar per metre at rated flow.
| Kit component | Typical specification | What to verify |
|---|---|---|
| Pneumatic pump assembly | 50:1, 55:1, or 60:1 pressure ratio | Ratio matched to grease grade and hose length |
| Follower plate + wiper seal | Sized to 290–310 mm drum bore; NBR or polyurethane wiper | Seal material vs. grease chemistry (FKM/PTFE for synthetics) |
| Drum cover / lid adapter | 315 mm standard for 20 kg drums | Matches your container’s internal diameter |
| High-pressure hose | 2–6 m; 400 bar working, ≥1,600 bar burst (4:1 safety) | Rated to full pump output, not air supply pressure |
| Dispensing gun + coupler | Hydraulic-type nipple coupler, trigger valve, swivel | Coupler rated above pump maximum output |
| Air regulation (FRL) | 1/4″ BSP inlet; clean, dry, lightly lubricated air | Compressor CFM sized to pump flow rate |
| Wheeled trolley (optional) | Rated 30–50 kg gross; loaded assembly 25–30 kg | Solid castors for shop floors, pneumatic tyres outdoors |
Air supply sizing is the most common failure point. For pumps up to 600 g/min, plan on 8–10 CFM at 7 bar with a 50 L receiver; for 600–1,000 g/min, 12–15 CFM with a 100 L tank; above 1,000 g/min, 18–25 CFM with a 150–200 L tank. An undersized compressor causes pressure sag and short-cycling. The air grease pump page details how ratio, air pressure, and hose length interact.
3. Comparison with alternatives
| Option | What you get | Best for | Trade-off |
|---|---|---|---|
| Complete pneumatic kit | Matched pump, plate, cover, hose, gun, trolley | New stations, service trucks, fleet PM | Higher upfront cost than piecing parts together |
| Bare pump head + own accessories | Pump only; you supply plate, hose, gun | Retrofitting existing drums and reels | Thread/pressure mismatch risk |
| Manual bucket pump | Hand lever, follower plate, short hose | Occasional single-point service, no air supply | Slow; operator effort rises sharply with stiff grease |
| Electric drum pump kit | Motor-driven pump with hose and gun | Sites without compressed air | Lower peak pressure than high-ratio pneumatic |
The decisive factor is duty cycle: daily dispensing across many machines justifies a 50:1 or 55:1 pneumatic kit; weekly top-ups suit manual or electric. One 20 kg drum at 5 g per cycle yields approximately 4,000 cycles — though 2–5% residual below the follower plate leaves roughly 19–19.5 kg usable.
4. Installation and maintenance tips
- Seat the follower plate correctly. Measure the drum’s clear bore about 50 mm below the rim — most 20 kg drums measure 290–330 mm there. The plate should be 2–5 mm smaller than the bore and sit flat on the grease surface before the first stroke to prevent air ingestion.
- Set the regulator at the pump, not the compressor. Verify at least 6 bar at the pump inlet under flow, accounting for hose pressure drop.
- Install an FRL upstream. Set the lubricator to 1–2 drops of ISO VG 32 or VG 46 air tool oil per minute; dry or dirty air is the primary cause of premature air motor vane wear.
- Inspect the follower seal at every drum change. NBR lip seals typically last 12–24 months or 50–100 drum changes; polyurethane resists abrasion from particle-fortified greases. Replace at any sign of cracking, swelling, or deformation.
- Purge correctly when changing grease types. Cycle the new drum into a waste container until the grease runs clean; for incompatible thickener families, solvent-flush the hose and gun between cycles.
5. ISOHITECH grease pump kit options
ISOHITECH supplies matched kit packages for the most common container formats. The pneumatic grease pump kit for 20 kg drums ships with 50:1/55:1/60:1 ratio options, follower plate, drum cover, hose, gun, swivel, and trolley; the 20 kg industrial bulk dispensing kit documents drum geometry and pressure-output math for engineering sign-off. For line work around a kit station, the grease line repair kit bundles over 140 fittings, adapters, and 25 m of 6 mm nylon tubing. Browse the full grease pump category for manual, electric, and pneumatic configurations.
Frequently Asked Questions
What is included in a typical grease pump kit?
A full kit normally includes the pneumatic pump assembly (commonly 55:1 ratio), a follower plate with wiper seal, a drum cover, a 2–6 m high-pressure hose, a grease gun with hydraulic-type coupler, and an optional wheeled trolley — all pressure-matched to the pump’s full output.
Which pressure ratio should I choose for a grease pump kit?
Choose 50:1 for general workshop duty with NLGI #1–#2 grease and moderate hose lengths. Step up to 55:1 or 60:1 for stiffer grease, longer runs, or cold environments — NLGI #3 below 10°C typically requires a 60:1 pump at a stable 8 bar air supply, and pre-warming the drum above 15°C helps.
What size air compressor does a pneumatic grease pump kit need?
Match the compressor to pump flow: 8–10 CFM at 7 bar with a 50 L tank up to 600 g/min; 12–15 CFM with a 100 L tank for 600–1,000 g/min; 18–25 CFM with a 150–200 L tank above 1,000 g/min. Undersizing is the most common cause of pressure sag.
Can a grease pump kit be wall-mounted instead of using the trolley?
Yes. Most pump units separate from the trolley frame, and wall-mount brackets are available for fixed dispensing stations with the drum on a roller stand or low-profile pallet. Secure the drum so it cannot tip under the follower plate’s downward pressure.
How do I know if my grease fitting is getting enough pressure?
Start from the fitting’s minimum injection requirement — typically 150–300 bar for standard DIN nipples — then subtract hose friction of roughly 0.3–0.8 bar per metre. The remainder must still exceed the bearing’s back-pressure, which rises with viscosity, bearing size, and consolidated old grease.
