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320/407/500/600.41912-ENG
6.11. Renewing the 407 CAT Shear Jaw Extension
(See Illustration 7.6, Page 52)
Always switch off and isolate the Shear from the mains
electrical supply before maintenance.
The 407, 500, and 600 CAT Shears are equipped with a Jaw Extension used for reopening
a Catalytic Converter tube after shearing. The Jaw Extension has a replaceable Wear
Plate, Item 6.3, which can easily be replaced using the following procedure:
• Lower the Blade Guard to its lowest position, this should give easier access to the
Jaw Extension Bracket.
• Loosen and remove the Lock Nuts, Items 6.1.
• Remove the Fasteners, Items 6.4, releasing the Wear Plate From the Jaw Extension
Bracket.
• If the Fasteners or Lock Nuts are too damaged to be easily removed, it might be
required to cut the Lock Nuts off. This will allow the Wear Plate to be removed from
the Jaw Extension Bracket.
• Ensure the Jaw Extension Bracket is flat and free Burrs on the side against which
the Wear Plate sits. File off any burrs or grind flush if required.
• Place a new Wear Plate against the Jaw Extension Bracket ensuring the holes
align.
• Fix the Wear Plate in place with the Fasteners and Lock Nuts. Use new Fasteners
and Nuts if the originals are damaged or worn.
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