Checklists can help operators maintain equipment properly. It is also important to follow company rules and the pertinent Mine Safety and Health Administration (MSHA) and Occupational Safety and Health Administration (OSHA) regulations. Safety should never be compromised. The following are fundamental checklists designed to identify areas and parts needing routine inspection. Slight modifications to the checklists may be warranted, depending on the manufacturer and type of impact crusher in operation.

Daily checks

Pre-start:

* Visually check to make sure the crushing chamber is empty (free of debris, rags, wire, rebar, stone, or any material that could impair startup or operation).

* Check for clearance between the blow bar and side liners.

* Check apron settings (track and log wear, and plan for next casting change).

* Check blow bar and apron liner condition; look for cracks or uneven wear. (Large, easily accessible, built-in inspection doors should be a part of the crusher design.)

* Check for loose bolts, inside and out; tighten before startup.

* Make sure all the guards and covers are secure.

* If applicable, check hydraulic fluid levels and start the hydraulic system, checking for proper operation.

Crusher startup:

* Inspect under the crusher and remove any excess stone buildup or foreign materials.

* Start the under-crusher conveyor and ensure proper operation.

* Start the crusher and note any vibration; excess vibration may indicate loose or failed rotor parts or material buildup on sheaves.

* Check and log motor amp draw, noting any change in the trend (an increase in amp draw indicates increased friction – motor bearings, crusher bearings, rotor rubbing against liners, etc.).

* Introduce feed; material should be evenly distributed across the crusher for even wear.

* Listen and feel for unusual operation; a howl could indicate worn bearings; screeches, grating, and grinding could mean something is loose.

* Again, visually inspect for loose bolts.

Shut down:

* Grease bearings and lubrication points as recommended by the manufacturer.

* Clean up any spillage around and under the machine.

* Check to make sure the crushing chamber is empty – free of debris, rags, wire, rebar, stone, or any material that could impair startup for the next shift.