Is Pre-lubrication Required Before Starting The Crusher?

In the demanding world of mining,quarrying,and aggregate production,crushers are the workhorses of size reduction.Their reliable operation is paramount to maintaining productivity and profitability.One fundamental procedure often debated or overlooked is pre-lubrication.So,is pre-lubrication required before starting a crusher?The unequivocal answer is yes,for virtually all modern,heavy-duty crushers.Skipping this step risks severe damage,costly downtime,and significantly shortened equipment lifespan.
What is Pre-Lubrication?
Pre-lubrication involves circulating lubricating oil through the crusher's critical bearings,gears,and bushings before the main drive motor is engaged.This is typically achieved using a dedicated lubrication system pump,often electrically driven,which runs for a predetermined period(specified by the manufacturer,usually several minutes)prior to startup.
Why is Pre-Lubrication Essential?
1.Establishing the Oil Film:The primary purpose is to create a hydrodynamic oil film between moving surfaces,particularly in sleeve bearings(like those in cone crushers)and between gear teeth.Starting a crusher"dry"means metal-on-metal contact occurs until oil pressure builds sufficiently.This initial friction causes microscopic wear,generates excessive heat,and can lead to scoring or seizure.
2.Removing Contaminants:Lubrication systems often incorporate filters and magnetic separators.Pre-lubrication flushes out any contaminants(dust,wear particles,moisture)that may have settled during shutdown,preventing them from circulating under load.
3.Distributing Coolant:Oil serves not only as a lubricant but also as a coolant.Pre-circulation helps stabilize the temperature within the bearing housings before the intense heat of crushing begins.
4.Verifying System Function:Running the lube pump beforehand allows operators to check for adequate oil flow,correct pressure,proper filter condition,and absence of leaks.Detecting a lube system fault before starting the crusher prevents catastrophic failure.
5.Compensating for Cold Starts:In colder environments,oil viscosity increases significantly.Pre-lubrication warms the oil slightly through circulation and ensures it can flow properly to all components before the load is applied.
Consequences of Skipping Pre-Lubrication:
•Bearing Failure:The most common and severe consequence.Dry starts can rapidly overheat bearings,leading to brinelling,pitting,smearing,or complete seizure.Bearing replacement is expensive and time-consuming.
•Gear Damage:Insufficient lubrication at startup can cause scoring,spalling,or even tooth breakage in bevel or spur gear sets.
•Increased Wear:Even minor dry starts accelerate wear on bushings,seals,and other components,reducing overall machine life.
•Premature Seal Failure:Lack of lubrication can cause seals to harden,crack,or wear excessively,leading to oil leaks and contamination ingress.
•Catastrophic Breakdowns:In extreme cases,neglecting pre-lubrication can trigger a cascade of failures resulting in major component destruction(e.g.,burned-out eccentric assembly,damaged mainshaft).
Manufacturer Requirements and Best Practices:
•Consult the Manual:Always refer to the specific crusher manufacturer's operating manual.It will explicitly state pre-lubrication requirements,including duration,pressure thresholds,and temperature considerations.
•Interlocks:Modern crushers are frequently equipped with lube system interlocks.These safety features prevent the main motor from starting until the lubrication system confirms adequate oil pressure and flow.Never bypass these interlocks.
•Warm-Up Period:After pre-lubrication circulates the oil,some manufacturers recommend a brief no-load"warm-up"run before introducing feed material.This further stabilizes temperatures and oil distribution.
•Routine Checks:Integrate pre-lubrication into standard operating procedures(SOPs).Ensure operators understand its importance and monitor key parameters(pressure gauges,temperature sensors,flow indicators)diligently.
•Cold Weather Precautions:In freezing conditions,additional measures like oil heaters or longer pre-lube cycles might be necessary to ensure proper oil viscosity and flow.
Pre-lubrication is not an optional step;it is a fundamental prerequisite for safely and reliably starting most industrial crushers.It safeguards the heart of the machine–its bearings and gears–by preventing destructive dry starts,flushing contaminants,verifying system health,and preparing the oil for the impending thermal and mechanical loads.Adhering strictly to the manufacturer's pre-lubrication procedures is a small investment of time that pays massive dividends in preventing costly repairs,minimizing unplanned downtime,and maximizing the operational life of your critical crushing equipment.In the crusher world,pre-lubrication isn't just recommended;it's essential for survival.