SK-505 Electric Grease Pump — Compact DC Piston Lubricator
The SK-505 electric grease pump is a compact DC piston lubricator for automatic and semi-automatic grease delivery on mobile equipment, compact machinery, and single-point or small multi-point systems. A small DC motor drives a piston pump that builds up to 8 MPa (80 bar) working pressure with approximately 13 cc/min discharge at rated duty.
Standard configuration: one outlet, 1 L polycarbonate reservoir (0.4 kg / 1 kg tank options available), DC 24 V supply (12 V optional), 25 W power, weight about 1.9 kg. Optional low-level switch signals the controller before the tank runs dry. Outlet adapts to PT 1/8 thread or 4 / 6 mm hose for connection to injectors, Zerk fittings, or a small distributor.
Compatible grease: NLGI #000 to #2 (soft to standard industrial greases). Pair with lubrication timers, single-line injectors, or direct feed on construction and agricultural machines. System context: grease pump hub · automatic lubrication · grease pump guide.
| Parameter | SK-505 typical spec |
|---|---|
| Model | SK-505 |
| Outlets | 1 |
| Discharge | ~13 cc/min (rated); ~6 ml/min at normal continuous duty per application |
| Working pressure | 8 MPa max |
| Max run time | ~5 min at normal pressure (duty-cycle limit—use timer control) |
| Reservoir | 0.4 kg / 1 L polycarbonate (1 kg option) |
| Voltage | DC 24 V standard; DC 12 V optional |
| Power | 25 W |
| Grease nipple | Zerk (standard grease gun fitting) |
| Level switch | Optional |
- General
- Product Video
- Reservoir
The SK-505 lubricator uses a piston positive-displacement pump driven by a compact DC electric motor. Unlike large industrial grease pumps, it targets installations where space, weight, and 12/24 V mobile power matter—excavator cabs, small presses, conveyors, and OEM skids.
- High pressure for size class — up to 8 MPa pushes NLGI #2 grease through short 4–6 mm lines
- Transparent polycarbonate tank — visual level check without opening the reservoir
- Single outlet simplicity — direct to injector or primary supply leg
Reservoir bodies use polycarbonate for impact resistance and oil/grease compatibility. Clear walls help maintenance crews see grease level during walk-around inspections. Optional low-level switch mounts on the tank for integration with a TC-2 timer or machine PLC.
Choose 0.4 kg for ultra-compact mounts or 1 L / 1 kg for longer service intervals between refills.
Aluminum Die-Casting Body
Pump head and mounting bracket use die-cast aluminum for stiffness and heat dissipation during repeated duty cycles. Lightweight construction suits vibration environments on mobile machines.
DC 24 V Motor
High-quality DC motor matched to piston load for reliable starts in cold weather when grease is stiffer. 12 V variant available for battery-native vehicle electrical systems.
1L Polycarbonate Reservoir
Impact-resistant clear tank with secure lid seal. Material chosen for long-term contact with lithium and calcium greases in NLGI #000–#2 range.
Related Product
Where SK-505 Fits in a Grease System
- SK-505 pump — builds pressure on timer or ignition signal
- Supply line — 4 or 6 mm nylon or high-pressure hose
- Metering — injector, small progressive block, or direct Zerk feed
- Lubrication points — bearings, pins, bushings
SK-505 vs Larger Automatic Grease Pumps
| Factor | SK-505 | 20703 automatic pump |
|---|---|---|
| Power | DC 12/24 V, 25 W | AC 220/380 V or DC 12/24 V, multi-element |
| Pressure | ~8 MPa | Up to ~25 MPa |
| Outlets | 1 | 1–5 elements / lines |
| Best for | Mobile, compact OEM | Cabinet progressive / injector banks |
Installation & Duty Cycle
- Mount pump upright; fill with clean NLGI-rated grease—no mixed brands without flushing.
- Wire through fused DC supply; respect max ~5 min continuous run at pressure—use timer ON/OFF cycles.
- Bleed air after refill: run short cycles until grease appears at outlet without bubbles.
- Route outlet away from heat; use hose rated for 8 MPa class.
Maintenance
- Refill before low-level alarm; dry running damages piston seals.
- Inspect Zerk and hose fittings for leakage each PM cycle.
- Replace piston pack if output drops at same voltage and grease grade.
Before you buy: read our complete guide to grease pumps.
WStandard options include approximately 0.4 kg and 1 L (1 kg) polycarbonate tanks. Specify tank size when ordering for mount footprint and refill interval.
NLGI #000 through #2. Softer greases (#000, #00) flow easiest in cold starts; #2 is acceptable at 8 MPa on short, well-routed lines.
DC 24 V is standard; DC 12 V is available for mobile and battery systems. Confirm fuse rating and duty cycle with your electrical drawing.
PT 1/8 thread or hose for 4 mm and 6 mm tubing. Grease nipple interface typically uses Zerk standard for field service guns.
Rated about 13 cc/min at specification; many installations see ~6 ml/min effective flow at normal pressure and timer duty. Size your cycle time from measured output on site.
Maximum about 5 minutes at normal pressure per duty rating—use a timer for intermittent lubrication rather than continuous operation.
Yes. Optional level switch integrates with a lubrication controller to stop the pump and alarm before the reservoir empties.