Numa Champion RC160, Care & Maintenance Instructions

07/16/15

Page 12

MANUFACTURER OF DOWN HOLE HAMMERS AND BITS

Champion

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RC160

HAMMER ASSEMBLY

•••••

Using the overhead crane, turn the hammer case upside down in a vertical position
so that the bit bearing bore is facing up.

•••••

Insert the bit bearing into the chuck end of the case.  This should be a close slip fit.
Making sure the bearing makes contact with the shoulder provided for it in the case,
insert the snap ring into the groove at the chuck end of the bit bearing diameter.

•••••

Using the overhead crane, turn the hammer case so that the backhead end is facing
up.  The hammer case should still be in a vertical position.

•••••

Lower the piston into the backhead end of the case using the 8" (203 mm) long,
1-1/4" (32 mm) diameter steel rods and the nylon straps.

•••••

Install the feed tube assembly into the backhead end of the case, making sure it is
firmly against the shoulder in the case.  Due to close tolerances, caution is advised
when inserting the feed tube assembly.  It should not be forced into the case.

•••••

Install the belleville washers in the counter bore of the feed tube assembly.  See the
stacking diagram on page 14 for proper installation.

•••••

Install the collection tube housing o-ring and the collection tube o-ring in the I.D. of
the collection tube housing.

•••••

Install the collection tube housing.  The collection tube housing will rest on the
belleville washers.

•••••

Place the check valve spring and check valve on the collection tube housing.

•••••

Install the check valve seat o-ring into the groove on the outside diameter of the
check valve seat.

•••••

Lower the check valve seat through the check valve and check valve spring.  Make
sure the check valve seat is seated into the collection tube housing.

•••••

Assemble the backhead o-ring into the groove in the backhead.  Install the collection
tube o-ring in the groove in the backhead on the drill rod mating end.  With the thrust
washer installed on the case shoulder, thread the backhead into the case and tighten
until the shoulder is tight against the case.

NOTE

DUE TO THE INTERNAL COMPRESSION SPRINGS, THE CHAMPION RC160 BACKHEAD

CAN ONLY BE 

FULLY

 TIGHTENED WITH A POWER WRENCH ON THE RIG.

CAUTION

LIFTING THE CHAMPION RC160 HAMMER WITH THE THREAD JOINTS LOOSE MAY
CAUSE DAMAGE TO THE THREADS.