Page 6
09/19/16
Patriot
®
180
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Using an overhead crane or lift truck of appropriate capacity, place the hammer
horizontally on a hammer stand and secure the hammer in the wrench. The chuck
end can be held by the 14-1/2" (368 mm) flats, in the wrench. The backhead is also
held in the 14-1/2" (368 mm) wrench except with the addtion of flat stock between the
wrench and the backhead flats (as the backhead flats are 12-1/2" (318 mm) across).
Place the visetongs on the area of the case where the bit bearing is located when
working on the chuck end of the hammer. When working on the backhead end of
the hammer, place the chain vise on the acceptable clamping area of the case.
Break the chuck and backhead loose, but do not remove.
CAUTION
THE ACCEPTABLE CLAMPING AREAS START 10" (254 MM) FROM EITHER CASE END,
TO AN ADDITIONAL 5" (127 MM) BEYOND THIS POINT. PLACING THE CHAIN VISE ON
THE AREA OF THE CASE WHERE THE PISTON CYCLES CAN DISTORT THE CASE, RESTRICT
PISTON MOVEMENT AND VOID THE WARRANTY.
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With the hammer standing in the vertical position, using an overhead crane and
handling plug, unscrew and remove the chuck/bit assembly from the case.
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Remove the bit retaining rings from around the bit.
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Remove the o-ring from the bit retaining rings.
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Remove the chuck from the bit.
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Remove the drive plates from the bit and chuck splines.
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Remove the brass thrust washer from the chuck.
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Using the overhead crane and handling plug, unscrew the backhead / feed tube
assembly from the case.
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Place the hammer horizontally on a hammer stand and secure the hammer with a
chain vise.
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With the case in a horizontal position and using a 2" (51 mm) diameter brass rod, slide
the piston out of the backhead end of the case. Using the nylon strap and overhead
crane, remove the piston from the case.
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Removal of the chuck bushing is not necessary for routine maintenance. If necessary,
lay the chuck on its side so that the bit end is facing you. Locate the seam in the
chuck bushing. Insert a screwdriver into the slot in the middle of the seam and pry
the chuck bushing from the under cut. Remove the chuck bushing from the bit end
of the chuck.
