Wet Grinding Mill Maintenance Guide

1. Daily Maintenance

Lubrication System

Check the bearings, gearbox, gears, and other lubrication points daily to ensure sufficient and clean lubricant.

During the initial operating period, replace the lubricating oil after approximately one month of operation. Afterward, replace it approximately every six months, or according to actual operating conditions and the maintenance schedule.

Use suitable high-temperature, anti-wear grease for critical bearings. Bearing temperatures should be monitored carefully and generally kept below 80°C.

Cleaning & Inspection

After daily operation:

• Remove residual ore and slurry from the grinding basin.

• Remove metal fragments, stones, or other hard foreign materials that could damage the rollers or basin.

• Check belt tension and alignment.

• Inspect bolts and fasteners for looseness.

• Check the machine for abnormal vibration, noise, leakage, or overheating.

• Inspect visible components for excessive wear or deformation.

Any abnormal condition should be investigated before the next start-up.

1. Periodic Maintenance

Weekly Inspection

Inspect major wear parts and transmission components, including:

Grinding Rollers • Grinding Basin • Liners • Bearings • Gears • Belts • Fasteners

Replace excessively worn or damaged components promptly to prevent secondary damage.

Bearing temperature and operating noise should also be checked regularly. As a general guideline, the bearing temperature rise should not exceed approximately 55°C.

Monthly Inspection

Perform a more comprehensive inspection of the equipment:

• Thoroughly clean internal components.

• Inspect the gearbox and transmission system for wear.

• Check the clearance and condition of the main bearings.

• Inspect lubrication lines and seals.

• Check the grinding rollers and basin for uneven wear.

• Adjust the roller-to-basin clearance when necessary.

• Re-tighten critical bolts and structural connections.

Maintenance frequency should be increased when the equipment operates continuously or under heavy-load conditions.

1. Critical Component Maintenance

Bearings

Bearings are critical to the stable operation of the wet grinding mill.

Regularly monitor:

Temperature • Lubrication • Noise • Vibration • Clearance

If abnormal temperature rise, unusual noise, excessive vibration, or serious wear is detected, stop the machine for inspection and replace damaged bearings when necessary.

Grinding Rollers & Basin

The grinding rollers and basin are among the primary wear components.

For split-type grinding rollers, only the worn roller rings may need to be replaced, reducing maintenance time and replacement costs.

When replacing the grinding basin, properly restore and level the buffer/supporting sand layer, install the new basin securely, and verify alignment before restarting the machine.

1. Operating Procedures

Before Start-Up

Before starting the wet grinding mill:

• Check lubrication and oil levels.

• Inspect bolts, belts, bearings, and transmission components.

• Ensure there are no tools or foreign objects inside the grinding basin.

• Confirm that all safety guards are correctly installed.

After start-up, allow the machine to run without load for approximately 3–5 minutes.

Only begin feeding material after confirming that the equipment is operating smoothly and without abnormal noise or vibration.

During Operation

Continuously monitor the equipment during production.

Pay particular attention to:

Bearing Temperature • Motor Temperature • Vibration • Noise • Feed Rate • Grinding Condition

Avoid sudden or excessive feeding that may overload the mill.

Stop the equipment immediately if severe vibration, abnormal noise, motor overheating, bearing overheating, or other unusual operating conditions occur.

After Shutdown

After production:

• Stop feeding before shutting down the main machine.

• Remove residual material from the grinding basin.

• Clean the working area.

• Inspect wear parts and transmission components.

• Record any abnormalities for subsequent maintenance.

1. Safety Precautions

Safety procedures must always be followed during inspection and maintenance.

When personnel enter or inspect the inside of the grinding basin, a dedicated supervisor should remain outside the equipment.

Before maintenance, ensure that the machine is completely stopped and the power supply is safely isolated to prevent accidental start-up.

Where required by the equipment installation design, use appropriate vibration-isolation or shock-absorbing pads to reduce vibration transmission to the foundation.

Never operate the equipment with damaged safety guards or known mechanical faults.

Recommended Maintenance Schedule

Maintenance Item	Recommended Interval
Lubrication inspection	Daily
Grinding basin cleaning	Daily
Belt & bolt inspection	Daily
Abnormal noise/vibration check	Daily
Bearings & wear parts inspection	Weekly
Grinding rollers & basin inspection	Weekly
Internal cleaning	Monthly
Gearbox & transmission inspection	Monthly
Main bearing clearance inspection	Monthly
Initial lubricating oil replacement	After approx. 1 month
Regular lubricating oil replacement	Approx. every 6 months

Important Note

The above maintenance intervals are general recommendations. Actual maintenance requirements should be adjusted according to the wet grinding mill model, operating hours, feed characteristics, production load, environmental conditions, and manufacturer specifications.

For models such as 1200, 1400, 1500, and 1600 wet pan mills, establishing a preventive maintenance schedule can significantly reduce unexpected downtime, improve operating reliability, and extend equipment service life.

Regular Inspection • Proper Lubrication • Timely Replacement • Safe Operation

These four practices are essential for maintaining reliable and efficient wet grinding mill performance.