Quick Answer: An automatic grease system stores grease in a central reservoir and delivers small, metered doses to every lubrication point on a programmed schedule — replacing manual “starve-and-flood” greasing with a consistent protective film. For mobile equipment up to 60 points, a 24V progressive system built around the IHI SK-505BM electric grease pump (14.7 MPa) is a proven choice. For multi-outlet parallel duty, the DZGK 24V/12V electrical grease pump delivers up to 25 MPa through 1–3 outlets.
Related: central lubrication system guide · understanding lubrication systems guide · industrial lubrication system design guide
An auto greasing system (also called an automatic greasing system or automatic grease system) removes the two biggest failure modes of manual routes — missed points and over-greasing — by metering small amounts while equipment runs.
IsoHiTech is a lubrication systems manufacturer supplying central lubrication systems, pumps, divider valves, and fittings for construction, mining, fleet, and industrial machinery.
How an Automatic Grease System Works
Every automatic grease system does the same five-step job: store grease, build pressure, meter the dose, deliver it, and verify the cycle. The controller starts the pump on a schedule; the pump pushes grease through the main line to metering devices; each device dispenses a fixed volume to its bearing; and a pressure or cycle switch confirms the event. Compared with manual greasing, a properly commissioned centralized grease lubrication system typically cuts lubricant waste by around 50%, extends equipment life by roughly 30%, and reduces lubrication labor by up to 70%.
Controller and Timer Logic
The controller’s two core parameters are the interval (OFF time between cycles) and the run time (ON time per cycle). System-level controllers typically allow intervals from 1 minute to 24 hours. Compact DC units are narrower: the DZGK pump accepts intervals from 4 minutes to 15 hours with run times of 8 seconds to 37.5 minutes, while the SK-505BM’s optional AGT controller offers start intervals from 30 minutes to 200 hours plus a protection timer that alarms if a cycle does not complete.
Two programming rules prevent most field problems. First, respect the motor duty cycle — the SK-505BM, for example, is limited to 5 minutes ON followed by at least 5 minutes OFF for cooling. Second, commission with a long interval (typically 8–12 hours), monitor consumption for the first week, then shorten only as needed. An ON time that is too short never builds full line pressure at the far points; one that is too long over-greases seals and overheats the motor.
The Pump, Divider Valve, and Injector Chain
The auto grease pump is only the pressure source; the metering chain decides how much grease each point receives. Progressive systems route the main line into a divider valve whose pistons fire in sequence; parallel systems feed injectors that reset when line pressure is vented. Operating pressure typically ranges from 150 to 350 bar depending on grease grade and line length, with injector output of 0.01–4 cm³ per cycle per point. Reservoirs span 0.4 L cartridges up to 30 kg plant tanks — a follower plate is recommended for NLGI 2 and stiffer greases.
Types of Automatic Grease Systems
Single-Line Parallel (Injector) Systems
In a parallel system, every injector connects to one shared supply line and operates independently. When the pump pressurizes the line, each injector discharges its preset volume; when the pump stops, a vent valve releases pressure so injectors recharge for the next cycle. One blocked injector does not stop the others — a key advantage on dirty machines. Parallel systems are the standard choice for trucks, agricultural machinery, and conveyors, handling NLGI 0 to 3 greases.
Single-Line Progressive Systems
Progressive systems meter grease through divider-valve pistons that must stroke in a fixed order, making the architecture inherently self-monitoring: a blockage anywhere halts the sequence and trips the alarm, so a fault is detected immediately rather than discovered as a failed bearing. The trade-off is that one blocked point stops the whole chain until cleared. Progressive systems suit machine tools, presses, and mobile equipment with up to about 60 points on a compact pump, typically running NLGI 000–2 greases.
Dual-Line Systems
Dual-line systems use two main lines that alternate under pressure through a reversing valve, with end-of-line pressure switches confirming full delivery. Because pressure is alternated rather than pushed sequentially, dual-line handles the longest runs and highest point counts — up to several hundred points — which is why it dominates steel mills, mining plants, and large industrial installations. Grease compatibility runs from NLGI 0 to 3.
Single-Point Automatic Grease Lubricators
A single-point automatic grease lubricator — also sold as an automatic grease feeder or automatic grease dispenser — screws directly onto one fitting and meters grease over weeks or months from a small onboard cell or electromechanical drive. Single-point units are the lowest-cost way to automate isolated, hazardous, or hard-to-reach points, and the usual first step when retrofitting older machines.
For market reference, well-known offerings include SKF automatic grease lubrication system and Lincoln auto grease system families; IsoHiTech also supplies compatible automated equipment such as the Lincoln ORSCO automated lubrication systems line for precision chain and conveyor applications. IsoHiTech supplies aftermarket-compatible components. Brand names used for compatibility reference only. IsoHiTech is not an authorized OEM dealer.
Choosing an Automatic Grease System by Application
Trucks and Trailers
An automatic grease system for trucks is almost always a 24V DC chassis system drawing power from the vehicle. Kingpins, fifth-wheel plates, slack adjusters, and spring pins are typical points; an automatic grease system for trailers adds landing gear and axle hardware. Specify an IP65-rated pump, parallel injectors for fault isolation, and a follower-plate reservoir so the pump primes reliably on grades.
Excavators and Heavy Equipment
An automatic greasing system for excavator duty must push grease through long boom and stick lines to pins and bushings under extreme shock loads. Progressive architecture is the norm because its blockage alarm protects exactly the high-value pins that fail first. Choose a pump in the 25 MPa class with adequate output per outlet — the DZGK delivers 5.5 ml/min per outlet — and size main lines generously. Auto lube systems for heavy equipment should also tolerate wide temperature swings; proven installations operate from -20°C to +60°C in mining service.
Industrial Machinery (CNC, Conveyors, Packaging)
Stationary machines allow AC-powered pumps with PLC integration — the DZGK, for instance, accepts external TC-2 controllers or customer PLC/DCS signals. Conveyors and packaging lines favor progressive dividers for monitoring; CNC machines need small, frequent doses to linear guides and ball screws. On automatic grease lubrication system price, a useful benchmark: direct systems up to 50 points typically run $2,000–$8,000 installed, while indirect systems covering 50–500+ points range from $8,000 to $25,000+.
System Components Selection Table
| Component | What to Specify | Typical Range | Selection Notes |
|---|---|---|---|
| Pump (auto grease pump) | Max pressure, output per outlet | 14.7–25 MPa; 5.5–13 cm³/min class | Match pressure to NLGI grade and longest line run |
| Controller | Interval range, ON-time limit, alarm output | Interval 1 min–24 h; run seconds–37.5 min | Respect motor duty cycle (e.g., 5 min ON / 5 min OFF) |
| Metering device | Progressive divider vs parallel injector | 0.01–4 cm³ per cycle per point | Progressive = self-monitoring; parallel = fault isolation |
| Reservoir | Capacity, follower plate, low-level switch | 0.4–1 L compact; 2–30 kg central | Follower plate required for NLGI 2 and stiffer |
| Lines & automatic grease system fittings | Tube OD/ID, pressure rating | Ø4×3 to Ø8×6 mm nylon, rated ≥20 MPa | Ø8×6 or Ø6×4 main lines; Ø4×3 short branches only |
| Grease | NLGI grade, thickener type | NLGI 000–3 (system-dependent) | Never mix incompatible thickeners |
Line Length, Pressure Drop, and Grease Grade
Pressure drop grows with line length, smaller tube ID, stiffer grease, and lower temperature. Three field rules follow. Keep compact pumps close to the points — typically within about 3 meters for small DC units — and reserve dual-line for genuinely long runs. Use Ø8×6 mm or Ø6×4 mm tube for main lines and keep Ø4×3 mm for short branches. And treat NLGI grade as a seasonal variable: a grade that pumps easily in summer can starve the same system in winter.
Cold weather is the hardest test. On the SK-505BM, NLGI #000/#00 greases are rated for -1°C to +38°C operation, while NLGI #1 requires +10°C or warmer; NLGI #2 is not recommended on that pump class because the higher consistency overloads the motor and chokes flow at low temperature. Many fleets therefore run one grade softer (NLGI #0 or #00) through winter. When changing grease, clean the reservoir first — mixing incompatible thickeners such as lithium complex and calcium sulfonate can harden the grease and block the pump.
Common Failures and Root Causes
| Symptom | Likely Root Cause | Corrective Action |
|---|---|---|
| Injector stuck (one point dry) | Contamination in the injector, or line pressure not venting so the injector cannot reset | Clean or replace the injector; verify the vent valve releases pressure after each cycle |
| Line blockage (progressive system stops, alarm trips) | Hardened grease, mixed-thickener incompatibility, or winter oil separation | Isolate sections and purge; flush and refill with a single compatible grease |
| Pump cavitation (output collapses, pump noisy) | Empty reservoir — dry running burns the piston seal within seconds — or air trapped from improper filling | Refill through the bottom fill fitting, never via the top cover; jog the pump to purge air |
| Far points under-lubricated | Pressure decay from long or undersized lines, stiff grease, cold ambient | Upsize main lines, shorten the loop, or step down one NLGI grade |
Installation and Commissioning Checklist
- Count and classify lubrication points. Roughly up to 60 points on a compact progressive pump; several hundred on dual-line.
- Mount the pump correctly. Vibration-damped bracket, reservoir vertical and visible, within about 3 m of the points on compact DC units.
- Size the tubing. Main lines Ø8×6 or Ø6×4 mm; branches Ø6×4 or Ø4×3 mm; rated ≥20 MPa.
- Fill through the fill fitting, not the top cover. Bottom-filling keeps air out of the pump inlet.
- Prime the whole network. Jog the pump until bubble-free grease reaches the farthest point.
- Start with a long interval. Begin around 8–12 hours, watch consumption for a week, then tune.
- Test the alarm. Simulate a blocked line and confirm the protection timer raises the fault signal.
For pump-level selection across industrial duty classes, see our companion automatic grease pump systems industrial guide.
Frequently Asked Questions
How does an automatic grease system work?
A controller starts the pump on a programmed schedule. The pump pressurizes the main line — typically 150–350 bar depending on grease grade and line length — and metering devices (progressive dividers or parallel injectors) dispense a fixed 0.01–4 cm³ per cycle to each point. A pressure or cycle switch confirms completion and alarms if the cycle fails.
What are the different types of auto lube systems?
Four main architectures: single-line parallel (injectors work independently; trucks and conveyors), single-line progressive (self-monitoring piston chain; machine tools and mobile equipment), dual-line (alternating main lines for long runs and hundreds of points; mills and mining), and single-point automatic grease lubricators for individual fittings.
What is the best automatic greasing system for excavators?
A 24V progressive system with a pump in the 25 MPa class, an IP65-rated enclosure, and a blockage alarm. Progressive metering protects high-value boom and stick pins because any line blockage immediately trips the alarm instead of silently starving the pin.
How much does an automatic grease system cost?
As an installed benchmark: direct systems serving up to 50 points typically cost $2,000–$8,000, while indirect systems covering 50–500+ points range from $8,000 to $25,000 or more. Most operations recover the investment within 12–18 months through reduced waste, labor savings, and longer component life.
Can I retrofit an auto lube system to older equipment?
Yes. For a handful of isolated points, single-point automatic grease lubricators screw onto existing fittings with no plumbing. For a whole machine, a compact 24V progressive auto greaser kit mounts to the frame and connects to existing grease fittings with Ø6–8 mm tubing. Confirm grease thickener compatibility before refilling the new reservoir.
IsoHiTech Automatic Grease Systems
IsoHiTech builds complete automatic grease lubrication systems — single-line progressive, dual-line, and multi-point parallel — with 12V/24V DC, 110V/220V AC, or pneumatic power and NLGI 000–3 compatibility. Send us your point count, grease grade, and line layout for a sized proposal: Request a Quote.
