Jaw Crusher Parts

A jaw crusher is made up of several main components, including the crushing chamber, the moving jaw, and the fixed jaw. These parts work together to help the jaw crusher crush rock and other materials.
Jaw Crusher Parts Details

Here are the key parts of a jaw crusher and their functions:

Item Description Item Description
1 Front frame 12 Moving jaw, lower
2 Upper wedge 13 Frame bolt
3 Filling wedge 14 Fixed wedge
4 Jaw die bolt 15 Pitman eye protection plate
5 Disc spring package 16 Flywheel
6 Cheek plate, upper 17 Eccentric shaft
7 Fixed jaw, upper 18 Pitman bearing
8 Moving jaw, upper 19 Pitman
9 Center wedges 20 Frame connecting rods
10 Cheek plate, lower 21 Side plate
11  Fixed jaw, lower 22 Toggle seat
Fixed Jaw Plate

Fixed Jaw Plate

The fixed jaw is the stationary component of the jaw crusher. It is typically made of manganese steel and is used to support the crushing chamber. Typically, it is a one-piece design and a two-piece design.

Qiming Casting is a professional manufacturer of various types and brands of crusher jaw plates in China. Whether it is a standard high manganese steel fixed jaw plate, or customized fixed jaw plates according to customer requirements, Qiming Casting is your first choice.

 

See Qiming Casting’s Fixed Jaw Plates

Moving Jaw Plate

Moving Jaw Plate

The moving jaw is the main component that does the crushing. It is driven by an eccentric shaft and is connected to the toggle plate. Typically, it is a one-piece design and a two-piece design, which are made of high manganese steel.

Qiming Casting is a professional manufacturer of various types and brands of crusher jaw plates in China. Whether it is a standard high manganese steel moving jaw plate, or customized moving jaw plates according to customer requirements, Qiming Casting is your first choice.

 

See Qiming Casting’s Moving Jaw Plates

Flywheel

Jaw Crusher Flywheel

The flywheel is a large wheel that is attached to the eccentric shaft. It provides momentum to the moving jaw, which helps to reduce the amount of energy needed to crush materials. Normally, the jaw crusher flywheel is made from low alloy high-strength steel or ZG35 casting steel.

Qiming Casting has worked with a number of high-quality local foundries to produce and design various types and brands of flywheels for quarries, mines, and other industrial customers.

 

Send US A Drawing or Part Number To Get A Quote

Jaw Crusher Shaft

Eccentric Shaft

The eccentric shaft is the component that drives the moving jaw. It rotates and moves the moving jaw in an up-and-down motion, which helps to crush materials in the crushing chamber.

Normally, the jaw crusher eccentric shaft is made from 30Mn5 casting steel.

Qiming Casting has worked with a number of high-quality local foundries to produce and design various types and brands of eccentric shaft for quarries, mines, and other industrial customers.

 

Send US A Drawing or Part Number To Get A Quote

toggle plate

Toggle Plate

The toggle plate is a component that connects the moving jaw to the eccentric shaft. It helps to transfer the force from the eccentric shaft to the moving jaw, which helps to crush materials in the crushing chamber.

Qiming Casting has worked with a number of high-quality local foundries to produce and design various types and brands of toggle plates for quarries, mines, and other industrial customers.

 

Send US A Drawing or Part Number To Get A Quote

Hey! Jaw Crusher Parts By Qiming Casting®

Qiming Casting® manufactures high-quality jaw crusher wear parts and spare parts for the mining, quarrying, and cement industry at suitable prices.

Better than OEM wear parts

Through direct cooperation with jaw crusher users, the wear parts produced by Qiming Casting are more wear-resistant, easier to install and have a longer service life.

In addition to standard manganese (Mn14, Mn18, Mn22) jaw plates, Qiming Machinery provides wear parts of different materials according to the different needs of customers.

High-quality aftermarket spare parts

Based on original drawings, Qiming Casting cooperated with local foundries to supply high-quality aftermarket spare parts. Qiming Casting® has successfully supplied replacement jaw stocks, flywheels, mainframes, and pitmans for jaw crushers amongst other major components, where the original equipment manufacturer has deemed these components obsolete.

We also can offer the OEM/ODM services of jaw crusher parts. The product can be customized according to your personalized requirements, including the brand, label, painting colors, and packing box. Please offer your design documents or tell us your ideas and our R&D team will do the rest.

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Some common problems and solutions for jaw crusher parts during machine operation

Toggle plate falls out of seat

Analysis problem

There are some reasons that may lead to the toggle plate falling out of the seat:

  1. The feed material is too large
  2. The tension spring is too loose
  3. Material fed directly onto the upper pitman cover
  4. Tension cylinder hydraulic pressure too low

Corresponding solutions

  1. Feed the Crusher with the proper size material. Make sure the feed hopper’s rear wall is properly designed.
  2. Tighten the tension spring.
  3. The material must be fed into the crushing chamber without hitting the upper pitman cover. Make sure the feed hopper’s rear wall is properly designed.
  4. Check the pressure.

Toggle plate seating surfaces wear prematurely.

Analysis problem

There are some reasons:

  1. The tension spring is too loose.

Corresponding solutions

  1. Tighten the tension spring.

Toggle plate breaks

Analysis problem

There are some reasons that may lead to the toggle plate breaks:

  1. The feed material is too small.
  2. Tramp iron or other uncrushable material caught near the bottom of the crushing chamber.
  3. The toggle plate is not installed correctly.

Corresponding solutions

  1. Feed the Crusher with the proper size material.
  2. Empty the crushing chamber to remove tramp iron or other uncrushable material.
  3. When installing the toggle plate, inspect the toggle seats for good condition and smooth, even surfaces.

Feed hopper has loosening or breaking bolts

Analysis problem

There are some reasons that may lead to the feed hopper loosening or breaking bolts:

  1. Feed material is being crushed too high in the chamber.
  2. The bolt fastener was not applied to the feed hopper bolts.

Corresponding solutions

  1. RESTRICT FEED! Feed to keep the chamber 2/3 full with proper size material for greatest efficiency.
  2. Apply bolt fastener.

Jaw plate bolts loosening or breaking

Analysis problem

There are some reasons that may lead to the jaw plate bolts loosening or breaking:

  1. Incorrect jaw dies installed.
  2. Jaw dies are installed incorrectly.

Corresponding solutions

  1. Contact Qiming Casting, use the right jaw plates.
  2. Re-install the jaw dies.

Insufficient capacity problem

Analysis problem

There are some reasons that may lead to the insufficient capacity problem:

  1. The feed is too large.
  2. Wrong direction of flywheel rotation.
  3. Incorrect speed.
  4. The crusher setting is too small.
  5. Jaw dies worn excessively.
  6. Loose jaw dies.
  7. Wrong jaw dies profile.

Corresponding solutions

  1. Check for proper feed size.
  2. Make sure the flywheels turn in the correct direction.
  3. Check for proper speed.
  4. Increase the crusher setting.
  5. Replace the jaw dies.
  6. Tighten the jaw die bolts.
  7. Consult your local representative.

Stalled Crusher

Analysis problem

There are some reasons that may lead to the stalled Crusher:

  1. Large rock or tramp iron jammed in the crushing chamber.
  2. Crusher setting is too small.
  3. Power failure.
  4. Motor failure.
  5. Damaged and/or loose V-belts.

Corresponding solutions

  1. Remove stuck material. DO NOT USE EXPLOSIVES TO CLEAR A STALLED CRUSHER!
  2. Each Crusher has a minimum recommended setting. DO NOT use a smaller setting.
  3. Check all fuses in the motor’s electrical control panel.
  4. Check the motor.
  5. Check the condition of the V-belts.

Excessive vibration

Analysis problem

There are some reasons that may lead to the excessive vibration:

  1. Wrong speed.
  2. Flywheels loose.
  3. Flywheel aligned with the wrong keyway during assembly.
  4. Counterweights incorrectly installed.

Corresponding solutions

  1. Operate the Crusher at the recommended speed.
  2. Tighten the flywheels properly. Weld the bolts together with plates to prevent them from coming loose.
  3. Remount the flywheel with the appropriate keyway.
  4. Check your installation manual.

Bearings too hot

Analysis problem

There are some reasons that may lead to the bearing too hot:

  1. Too much or insufficient grease.
  2. Incorrect crusher speed.
  3. Crusher operating at a smaller setting than recommended.
  4. Crusher not level.
  5. Feeding the Crusher with very fine material.

Corresponding solutions

  1. Use the correct quantity of grease for each bearing. Seat a schedule for the greasing of the bearings.
  2. Check the Crusher’s speed.
  3. Each Crusher has a minimum recommended setting. DO NOT use a smaller setting.
  4. Check or re-level the Crusher.
  5. Feed the Crusher with the proper size material.

Crusher speed varies

Analysis problem

There are some reasons that may lead to the crusher speed varies:

  1. Damaged and/or loose V-belts.
  2. Inadequate plant voltage level.

Corresponding solutions

  1. Check the condition of the V-belts.
  2. Check the plant’s voltage level.

A "knocking" is heard while operating.

Analysis problem

There are some reasons that may lead to “knocking” being heard while operating:

  1. The tension spring is too loose.
  2. The toggle plate is improperly seated.
  3. Loose jaw dies.
  4. Jaw dies hitting each other.
  5. The tension cylinder hydraulic pressure is too low.

Corresponding solutions

  1. Tighten the tension spring.
  2. Check the toggle plate and seats for wear.
  3. Tighten the jaw die bolts.
  4. Check the crusher setting.
  5. Check the pressure.

Movement of the jaw dies

Analysis problem

There are some reasons that may lead to movement of the jaw dies:

  1. Loose jaw dies.
  2. Inadequate clearance.
  3. Centralizing lug is worn out.

Corresponding solutions

  1. Tighten the jaw die bolts.
  2. Check that the clearance between the upper and lower jaw dies is between 5-8 mm.
  3. Repair the lug.

Adjusting wedges don´t move

Analysis problem

There are some reasons that may lead to adjusting wedges don´t move:

  1. Wedge surfaces worn.

Corresponding solutions

  1. Drop a couple of small stones into the cavity to decrease friction between wedges.

Active setting control: The setting opens by itself. There is no uncrushable material in the cavity.

Analysis problem

There are some reasons that may lead to this problem:

  1. The seals are leaking.
  2. Pressure relief valves are faulty.
  3. The feed material is too small.

Corresponding solutions

  1. Check the possible oil leaks.
  2. Contact your plant manufacturer.
  3. Feed the crusher with the proper size material.