An automatic lubrication pump is the heart of a centralized lubrication system. But its role goes beyond simply moving grease or oil through a pipeline. It needs to deliver the right amount of lubricant, at the right pressure, and at the right time—consistently and reliably.
At BAOTN, we design and supply centralized lubrication systems, one of the first things we look at is how the pump performs throughout a complete lubrication cycle. Understanding this process makes it easier to select the right pump, set the correct lubrication interval, and quickly identify problems when something goes wrong.
How Does an Automatic Lubrication Pump Work?
A typical automatic lubrication system follows a simple path:
Lubricant reservoir → Pump element → Main lubrication line → Distributor → Lubrication points
When a lubrication cycle starts, an electric motor drives the pump element. The pump draws grease or oil from the reservoir and builds the pressure needed to move it through the main line.
The lubricant then reaches a distributor, which meters and directs it to the individual lubrication points. In a progressive lubrication system, for example, the distributor sends lubricant to each outlet in a controlled sequence.
Once the required amount of lubricant has been delivered, the pump stops. It remains on standby until the next lubrication cycle begins.
The cycle can be triggered by a timer, machine controller, PLC signal, or another control system. This allows lubrication to take place automatically, often while the equipment is running, without requiring an operator to grease each point manually.
What Happens During an Automatic Lubrication Cycle?
Although the process is automatic, several things happen inside the system during each cycle.
The Pump Starts
The controller sends a start signal based on the programmed lubrication interval.The interval should be based on the actual operating conditions of the equipment rather than simply being set as short as possible. Machine speed, load, temperature, working environment, lubricant type, and the manufacturer's recommendations all affect how frequently lubrication is needed.Too little lubricant can accelerate wear, while excessive lubrication can increase grease consumption, raise operating temperatures, and even damage seals.The Pump Builds Pressure and Moves the Lubricant
Once the motor starts, the pump element draws lubricant from the reservoir and pushes it into the main lubrication line.The pressure required depends on the entire system. Long pipelines, small tubing diameters, multiple distributors, low temperatures, and high-consistency grease can all increase flow resistance.For that reason, we don't recommend choosing an automatic lubrication pump based on maximum pressure alone. Pump displacement, lubricant consistency, pipeline layout, number of lubrication points, and required delivery volume all need to be considered together.For example, our GET high-pressure lubrication pump is available with nominal pressure ratings of 16, 25, and 35 MPa, along with different displacement options. The appropriate configuration depends on the requirements of the application rather than simply choosing the highest pressure available.The Distributor Delivers Lubricant to Each Point
Once the lubricant enters the main line, the distributor controls where it goes.This is an important part of the system. If one bearing receives too much lubricant while another receives too little, the problem may have nothing to do with the pump itself. A blocked line, incorrect metering element, damaged fitting, or malfunctioning distributor can all affect lubricant delivery.For multi-point applications, we therefore consider the pump, distributor, and piping as one complete system.The GET series can be configured with multiple outlets and used with a progressive distributor for centralized lubrication of multiple points. This makes it suitable for applications where several bearings or moving components need to be lubricated from a single pump.The Pump Stops and the System Enters Standby
Once the lubrication cycle is complete, the pump stops.The system then waits for the next programmed interval. Depending on the system design, pressure may be released between cycles or maintained for a specific period.In automated equipment, the lubrication cycle can also be synchronized with the machine's operating sequence through a PLC or other control system.The GET series supports control through either a host PLC or an independent controller, making it easier to integrate the lubrication system into different types of automated equipment.
What Should You Check During Pump Operation?
A pump starting normally doesn't necessarily mean the lubrication system is working properly. During commissioning and routine maintenance, we typically check several points.
Lubricant Level
Make sure there is enough grease or oil in the reservoir.
If the lubricant level becomes too low, the pump may draw air into the system, which can interrupt normal lubricant delivery. For equipment that operates continuously, a low-level monitoring function can provide an early warning before the reservoir runs empty.
System Pressure
Keep an eye on pressure during operation.
A sudden or sustained increase in pressure can indicate a blocked lubrication line, clogged distributor, restricted fitting, or blocked lubrication point. It can also occur when the lubricant is too viscous for the operating conditions.
A pressure relief or regulating device helps protect the system, but it should not be used to mask an underlying blockage.
Lubricant Delivery
It's important to confirm that lubricant is actually reaching the lubrication points.
A pump can run normally while a bearing or bushing remains under-lubricated. If this happens, trace the lubrication path from the pump outlet through the main line, distributor, branch tubing, and fittings to the lubrication point.
Cycle and Fault Monitoring
For automated equipment, monitoring the lubrication cycle can help identify problems before they lead to equipment downtime.
Depending on the configuration, the GET system can incorporate cycle detection as well as pressure and low-level monitoring. These functions provide useful feedback to the control system when lubricant delivery or system pressure is outside the expected range.
Common Problems With Automatic Lubrication Pumps
The Pump Runs, but No Grease Reaches the Lubrication Points
Start with the basics: check the lubricant level, suction path, pump element, and main lubrication line.
Air trapped in the system can also interfere with grease delivery, particularly after the reservoir has been emptied or the system has been serviced. Proper filling and venting procedures can help prevent this problem.
The System Pressure Is Too High
High pressure usually means that lubricant is encountering excessive resistance somewhere downstream.
Check the main line, branch tubing, distributor, fittings, and lubrication points for blockages. It's also worth confirming that the grease consistency is suitable for the system and the ambient temperature.
Some Lubrication Points Receive Grease, but Others Do Not
When only certain points are receiving lubricant, look closely at the distribution system.
A blocked outlet, incorrect metering component, or problem with a progressive distributor can prevent lubricant from reaching specific points even though the pump itself is operating normally.
The System Uses Too Much Grease
More grease does not necessarily mean better lubrication.
If lubricant consumption is unusually high, check the pump displacement and lubrication interval first. Also look for leaking fittings, damaged seals, or excessive delivery at individual lubrication points.
The goal of an automatic lubrication system is controlled and consistent lubrication—not simply delivering as much grease as possible.
How to Choose an Automatic Lubrication Pump
Before selecting a pump, we usually collect a few basic operating parameters:
Number of lubrication points
Type of lubricant
Grease consistency or oil viscosity
Required lubricant volume
Required working pressure
Pipeline length and layout
Distributor type
Operating temperature
Power supply
Control method
Required reservoir capacity
These details help determine the appropriate pump displacement, pressure rating, outlet configuration, reservoir size, and control method.
For grease applications, lubricant consistency is particularly important. Our GET series is designed for NLGI 000–2 grease and N68 or higher lubricating oil under standard-temperature conditions, with reservoir capacities ranging from 1.5 L to 8 L depending on the configuration.
A pump that looks suitable on paper may still perform poorly if its output, pressure, lubricant compatibility, or control method does not match the actual system.
Reliable Pump Operation Starts With the Whole Lubrication System
An automatic lubrication pump works as part of a larger system. The pump, lubricant, distributor, tubing, controller, and lubrication points all need to work together.
In practice, what looks like a pump problem is often caused by something elsewhere in the circuit. A blocked line, unsuitable grease, incorrect lubrication interval, air in the system, or poor filling procedure can all affect pump performance.
That's why we look at the complete lubrication circuit when selecting equipment or troubleshooting an automatic lubrication pump.
If you're working on a new centralized grease lubrication system, you can review the GET high-pressure lubrication pump and its available configurations.
If you're unsure about the required pressure, displacement, reservoir capacity, distributor, or control method, contact our technical team. Share your machine type, number of lubrication points, lubricant, operating conditions, and expected lubrication cycle, and we can help you work out a practical system configuration.
