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DISASSEMBLY
If at all possible, the backhead and chuck should be broken loose on the drill rig; this
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is much easier than trying to do so after the drill has been removed from the drill rig.
USE CAUTION WHEN HANDLING DOWN THE HOLE HAMMER PARTS. NUMA HAMMER
PARTS ARE MANUFACTURED FROM HARDENED, HEAT TREATED MATERIALS. DROPPING
OR STRIKING THESE PARTS MAY CAUSE SEVERE DAMAGE. STRIKING THE HAMMER
PARTS WITH HAMMERS, CROWBARS OR LIKE INSTRUMENTS WILL VOID THE WARRANTY.
Maintenance should be performed in a clean environment.
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Tools needed: appropriate hammer lifting device, a hammer stand, chain vise, 2" (51
•
mm) diameter brass rod, a press, a drift pin and a small screwdriver.
Clean the outside of the hammer. This will insure a good surface to clamp on.
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With the hammer standing in the vertical postition, using an appropriate lifting device,
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unscrew and remove the chuck/bit assembly from the case.
Remove the bit retaining rings from around the bit.
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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 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 an appropriate lifting device, unscrew and remove the backhead/feed tube
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assembly from the case.
Place the hammer horizontally on a hammer stand and secure the hammer with a
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chain vise.
02/09/23
SECTION II
MAINTENANCE
CAUTION
Patriot
125/125HD
Page 5
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