Common Faults and Troubleshooting methods of Jaw crushers

Fault phenomenon

The main unit suddenly shut down (commonly known as: stalling).

Reason

1) The discharge port is blocked, causing a full blockage of materials. 2) The V-belt driving the sprocket to rotate is too loose, causing the belt to slip. 3) The eccentric shaft locking bushing is loose, resulting in no gap on both sides of the bearing housing of the frame, causing the eccentric shaft to get stuck and unable to rotate. 4) The voltage at the working site is too low. When the main machine encounters large materials, it is unable to break them. 5) The bearing is damaged.

Exclusion method

Clear the blockage at the discharge port to ensure smooth discharge. 2) Tighten or replace the V-belt; 3) Reinstall or replace the locking bushing; 4) Adjust the voltage at the working site to meet the requirements of the main unit's working voltage; 5) Replace the bearing.

Fault phenomenon

The sprocket and movable jaw of the main machine are operating normally, but the crushing work has stopped.

Reason

1) The tension spring breaks; 2) The pull rod is broken; 3) The toggle board has fallen off or broken.

Exclusion method

1) Replace the tension spring; 2) Replace the pull rod; 3) Reinstall or replace the toggle plate.

Fault phenomenon

The output fails to meet the factory standard.

Reason

1) The hardness or toughness of the crushed material exceeds the range specified in the user manual; 2) The wiring position of the motor is reversed, the main unit is turned in the wrong direction (the movable jaw rotates clockwise), or the motor is connected in a delta configuration instead of a star configuration. 3) The discharge opening is smaller than the specified limit; 4) The jaw plate is displaced, with the tooth tops facing each other. 5) The voltage at the work site is too low;

6) When the movable jaw and the bearing wear out, the clearance becomes too large, causing the outer ring of the bearing to rotate relatively.

Exclusion method

1) Replace or add a crusher; 2) Swap the motor wiring;

3) Adjust the discharge opening to the nominal discharge opening specified in the manual and add a crusher for fine crushing. 4) Check the pitch size of the tooth plate. If it does not meet the standard, the jaw plate must be replaced. Adjust the relative position between the fixed jaw plate and the movable jaw plate. After ensuring that the tooth top is aligned with the tooth root, fix and press it tightly to prevent displacement. 5) Increase the voltage at the working site to meet the heavy-load requirements of the main unit; 6) Replace the bearings or movable jaws.

Fault phenomenon

There are jumping or knocking sounds when the movable and fixed jaw plates are working.

Reason

1) The fastening bolts of the jaw plate are loose or fallen off; 2) The discharge opening is too small, and the bottoms of the two jaw plates collide with each other.

Exclusion method

1) Tighten or fully install the bolts; 2) Adjust the discharge opening to ensure the correct gap between the two jaw plates.

Fault phenomena of the crusher body

The toggle board is broken.

Reason

1) The main unit is overloaded or materials larger than the size of the feed port enter.

2) Non-crushed materials enter the crushing chamber; 3) The toggle board and the toggle board pad are not parallel and are skewed. 4) The casting has relatively serious casting defects.

Exclusion method

1) Replace the toggle plate and control the feed particle size, and prevent the main machine from being overloaded. 2) Replace the toggle plate and take measures to prevent non-crushed materials from entering the crushing chamber; 3) Replace the toggle plate and the worn toggle plate pads, and install the toggle plate correctly. 4) Replace the elbow plate with a qualified one.

Fault phenomenon

The spring is broken.

Reason

When reducing the discharge opening, the spring was not released.

Exclusion method

Replace the spring.

Fault phenomenon

The adjustment seat is broken.

Reason

1) The toggle plates and toggle plate pads are self-purchased or modified, which do not meet the design requirements of the main engine manufacturer. 2) The fixing bolts of the adjustment seat are loose; 3) The adjustment seat has serious casting defects or welding defects.

Exclusion method

1) Replace the adjustment seat and install the original toggle plate and toggle plate pad from the original manufacturer. 2) Replace the adjustment seat and tighten the adjustment seat bolts; 3) Replace the adjustment seat.

Fault phenomenon

The eccentric shaft is bent or broken.

Reason

1) During the hoisting process of the main unit, it overturned sideways, causing the eccentric shaft to bend under force on one side. 2) The hardness of the crushed object exceeds that specified in the product's user manual; 3) The main unit has been operating under excessive load for a long time; 4) The toggle plate does not meet the standard and serves a self-breaking protective function when non-crushed materials enter the crushing chamber.

5) Improper heat treatment of the eccentric shaft led to stress concentration, causing it to break within a short period of time.

Exclusion method

1) Replace the new eccentric shaft and lift the main unit correctly; 2) Replace the eccentric shaft with a new one and select a crusher that is suitable for the compressive strength of the crushed material. 3) Replace the eccentric shaft with a new one, adjust the working load or replace it with a suitable crusher; 4) Replace the eccentric shaft with a new one and do not use toggle plates or toggle plate pads that do not meet the design standards. 5) Replace the eccentric shaft with a new one that has passed heat treatment.

Fault phenomenon

The movable jaw is fractured.

Reason

1) Casting leaves serious defects such as dense pores; 2) Using substandard toggle plates and toggle plate pads, the toggle plates of the crusher did not self-break for protection when subjected to strong impact. 3) The movable jaw moves within the frame, and one end at the bottom collides with the edge guard plate of the frame. 4) The tension of the pull rod spring failed and was not replaced in time. 5) The discharge opening is smaller than the specified limit; 6) The feeding position is incorrect, leaning towards one end or the Angle of the discharge hopper is too steep, causing the material to directly hit the head of the movable jaw.