Jaw Crusher Rust Prevention Problem

What is the jaw crusher rust prevention problem?

Rusting is a specific type of corrosion that occurs on iron and steel surfaces when both water and oxygen are present.

Since air, usually contains some moisture, and ordinary water contains dissolved air, the elements required for rusting are practically always present. Rust on iron or steel is porous so that water and oxygen can still penetrate into the underlying surface. Therefore, rusting continues and penetrates deeper into the metal.

Rust is dangerous and expensive. Damage by rust costs the industry dearly annually. In many plants around the world, rusting is the major cause of:

• Downtime
• Lost production
• Wasted production
• High maintenance costs
• Early replacement of equipment
• Safety hazards to personnel

The cost can be greatly reduced through a rust prevention program that includes the use of proper rust preventives. A suitable anti-corrosive agent, for example, is Tectyl 506.

The jaw crusher must be protected against corrosion during seasonal shutdowns (winter or summer) as well as long-term storage (indoor and outdoor).

How to protect your jaw crusher?

To protect your crusher from rust corrosion during the seasonal shutdown, shipment, or for outdoor storage (winter or summer), the following protective measures are recommended:

• At least once each month while the crusher is in storage or during the seasonal shutdowns the crusher should be operated for a least 5 minutes to make sure the bearings remain properly greased. If the crusher is in storage and cannot be operated, the jaw crusher flywheel must be rotated 3 or 4 times by hand to make sure the bearings are properly greased. Add grease to the bearings at this time, if necessary.
• If the flywheels have been removed from the eccentric shaft, the contact surfaces of the flywheels and the shaft must be protected with an anti-corrosive agent.
• If the pitman has been removed from the frame, make sure there is enough grease in the labyrinth seals to prevent impurities from entering into the bearing housings. The contact surfaces of the frame bearing housings and the frame, the toggle plate and its seats, and the hole of the tension rod (if applicable) must also be protected with an anti-corrosive agent.
• Store the crusher and any removed components on a firm support so that it does not touch the ground.
• When the crusher is removed from storage, the condition of the paint must be checked and corrected if necessary. The anti-corrosive agent must also be removed from all contact surfaces prior to assembling the crusher.

The above procedure is necessary, as moisture condensation will cause corrosion where the bearing rollers contact the inner and outer rings. This corrosion will destroy the highly finished surfaces of the rollers and rings at this point. When the crusher is started and operating under load, bearings not properly greased will soon become rough, causing premature bearing failure.