SM Air Grease Pump — 2 L Pneumatic Lubricator for Injector Circuits
Main Parameter
| Reservoir | 2L |
| Discharge | 8cc/stroke |
| Pressure ratio | 18:1 |
| Pressure | 4MPa-15Mpa |
| Maximum stroke per minute. | Eight stroke/min |
| Lubricant | #000-NLGI #2 |
| Level switch | option |
| Lubrication System | Injector |
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- Intro
- Application
The SM air grease pump is a compact pneumatic lubricator for small centralized circuits that feed positive displacement injectors (PDI) or light progressive branches. Compressed air drives a reciprocating pump element; each forward stroke delivers a fixed grease volume to the main line while a check valve prevents backflow on the return stroke.
With a 2 L reservoir, 18:1 pressure ratio, and 8 cc per stroke, the SM pump suits machine tools, packaging lines, and mobile equipment where electrical pumps are undesirable. Output pressure typically reaches 4–15 MPa depending on air supply and grease grade (NLGI #000–#2).
Compare larger plants: air grease pump (drum) · barrel grease pump · air-powered grease pump category.
The lubricating oil is released during the forward stroke, and all positive displacement injectors are actuated. A check valve also prevents pressure from building up on the return stroke.
How the SM Air Grease Pump Works
- Air supply (typically 0.4–0.6 MPa shop air) enters the pneumatic motor section.
- Pressure ratio 18:1 multiplies grease pressure at the outlet — sufficient for most PDI injector cracking pressures.
- Forward stroke displaces ~8 cc into the main line; connected injectors fire when line pressure exceeds their start pressure.
- Return stroke — check valve holds line pressure at injectors while the pump chamber refills from the 2 L reservoir.
- Controller/timer (optional external) sets cycle rate; maximum about 8 strokes/min on standard config.
Key Specifications
| Parameter | SM air grease pump (typical) |
|---|---|
| Reservoir | 2 L |
| Discharge | 8 cc / stroke |
| Pressure ratio | 18:1 |
| Outlet pressure | 4–15 MPa (grease & air dependent) |
| Max stroke rate | ~8 strokes / min |
| Lubricant | NLGI #000 – #2 grease |
| Level switch | Optional low-level signal |
| System pairing | PDI injectors · progressive distributors |
Recommended System Pairings
- PDI / positive injector — positive injector lubrication system with Single, ZEM, or DLX injectors
- Single DLX injector points — DLX single lubrication injector
- Progressive branches — small SSV or U IHI block when point count is moderate
- Distribution hardware — 6 mm tubing, couplings, clips
SM vs Drum Air Grease Pumps
| SM (2 L) | Drum pump (20–200 kg) | |
|---|---|---|
| Reservoir | 2 L integrated | 180–200 kg barrel |
| Ratio | 18:1 | 40:1 – 60:1 common |
| Best for | Single machine, injector circuits | Plant-wide central fill |
| Footprint | Compact on machine frame | Requires barrel station |
Commissioning & Grease Fill Procedure
- Use only recommended NLGI grade — grease must pump without oil separation in cold start conditions.
- Fill reservoir; install follower plate if supplied.
- Run several dry cycles before connecting to distribution line.
- Connect to centralized feed line; open branch valves progressively.
- Bleed air — remove lid screw if fitted; depress follower bleed valve until grease appears without bubbles.
- Verify each injector or block outlet with 2–3 full cycles.
Accessories (typical BOM)
- Progressive distributors — SSV / U block for multi-point grease
- PDI injector system — per-point metering on oil or soft grease
- Outside timer / PLC — cycle control and low-level alarm
- Level switch — optional reservoir monitoring
Maintenance Schedule
- Daily: check reservoir level and air pressure gauge
- Weekly: inspect outlet fitting for leaks; listen for irregular stroke
- Monthly: clean air filter; verify timer program matches production hours
- Quarterly: inspect pump element seals; replace if stroke volume drops
Troubleshooting
| Symptom | Likely cause | Action |
|---|---|---|
| No grease output | Empty reservoir, air off, frozen grease | Fill; heat grease; check air 0.4+ MPa |
| Low pressure at injectors | Worn element, air leak, wrong NLGI | Service pump; use softer grade temporarily to test |
| Air in lines | Improper bleed after fill | Repeat follower bleed procedure |
| Excess noise | Low air, dry grease | Adjust regulator; change grease grade |
Video reference: lubrication system video library. Quote: contact IsoHiTech.
Before you buy: read our complete guide to grease pumps.
Compact 2 L pneumatic lubricator feeding PDI injectors or small progressive circuits on individual machines.
NLGI #000 through #2. Very stiff greases may need drum pumps with higher ratios.
Typically 0.4–0.6 MPa (4–6 bar) clean compressed air for reliable 18:1 boosting.
About 8 cc per stroke, up to roughly eight strokes per minute on standard configuration.
Yes, for small outlet counts within pressure and flow limits. Large chassis circuits may need higher-capacity pumps.
Optional level switch for remote alarm — specify on order.
SM uses compressed air (no electrical hazard); electric auto pumps suit fixed plants with timer-built reservoirs. See hand grease pump for manual alternatives.