McCloskey J40, J45, J50 jaw crusher parts

Fixed and swing jaw plates — J40, J45, J50

Cast in Mn18Cr2, Mn21Cr2. Work-hardens under impact from 220 HB to 500+ HB. Manufactured to original McCloskey specifications. Single-piece and multi-segment designs in stock.

J series design notes

Deep jaw box — Increased stroke and faster jaw speed vs. previous generation. Larger gap between crusher discharge and conveyor feed boot reduces bridging.

Heavy-duty cheek plates — Bolt-on, replaceable. Protect the frame sides from direct wear.

User interface — On-board diagnostics with hydraulic CSS adjustment. No manual shimming.

Portability — Track-mounted with folding hopper and side conveyor. Moves between sites without disassembly.

Fixed jaw + swing jaw plate sets in stock. Tell us your model (J40/J45/J50) and tooth profile — standard, quarry, or super grip.

FAQ — McCloskey J series jaw crusher parts

How long do J series jaw plates last?

Typically 400–800 hours depending on material abrasiveness. Quarry profile plates wear faster than standard — the deeper tooth profile means less steel mass per tooth. Rotate or flip reversible plates at 50% wear to extend total service life.

What causes uneven jaw plate wear?

Uneven feed distribution is the most common cause — material should enter the center of the crushing chamber. Check that the feed hopper is centered and the feeder is distributing evenly. Worn cheek plates can also channel material to one side.

Fixed jaw wears faster than swing jaw — is this normal?

Yes. The fixed jaw takes more direct impact because material contacts it first. A 60/40 wear ratio (fixed/swing) is typical. If the ratio exceeds 70/30, check your CSS setting — you may be crushing too fine for the jaw configuration.