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The mantle, concave can be replaced without removing the mainshaft after dismantling the upper frame. it is sometimes necessary to lift the mainshaft out of the crusher in order to check the thrust bearings. Thrust bearings should be inspected at least once a year.

To remove the mainshaft, screw the ring head bolts into the tapped holes at the top of the mainshaft, then carefully lift it up and out of the way. Place it on the stand or tilt it sideways into the lowering, taking care not to damage the upper and lower bearing surfaces of the spindle. Do not allow the thrust bearing surfaces to come into contact with the ground, they should be protected by lining them with rubber plates.

Remove the stop ring between the nut and the mantle and concave using gas cutting or grinding, and carefully remove the mantle and concave.

Loosen the lock nut. Lift and remove the mantle, concave and nut together. If necessary, repair by welding.

Clean and inspect the assembly surface at the mantle, concave and repair as necessary.
Check the condition of the dust seal and replace it if necessary. The gap between the dust seal and the sliding ring must not be more than 1.5mm.

If the spindle has been removed, check the condition of the thrust bearing. If the bronze plates of the bearings are worn to the extent that the oil grooves are less than 2mm deep, they must be replaced. Thrust bearings should be inspected at least once a year.

Check the condition of the lower frame guards. Repair or replace as needed.
Clean the mounting surface of the new mantle, concave. Lift the concave onto the moving cone. Be sure the lower edge of the concave is tight against the mantle. there should be no clearance between the mantle and concave. Install the new stop ring and nut onto the mantle, concave.
After tightening, weld the nut, cut ring and concave together.

If the spindle has been removed:
–When lifting the spindle, check that the thrust bearing center plate is still in place.
–Before lowering the spindle, slide the bearing intermediate plate to the side of the support plate (bronze) against the eccentric shaft to seat the thrust bearing as well as possible.
–Lift and lower the spindle carefully into the crusher. Note that the eccentric shaft bushing bore is angled. Be careful not to damage the surface of the bushing. Also be careful not to damage the dust seal ring as it slides over the sliding ring.

Zhejiang Jinhua Shanvim Industry and Trade Co., Ltd., established in 1991. The company is a wear-resistant parts casting enterprise. The main products are the wear-resistant parts such as mantle, bowl liner, jaw plate, hammer, blow bar, ball mill liner, etc.. There are medium and high , Ultra-high manganese steel, medium carbon alloy steel , low, medium and high chromium cast iron materials, etc.. It mainly produces and supplies wear-resistant castings for mining, cement, building materials, infrastructure construction, electric power, sands and gravel aggregates, machinery manufacturing and other industries.