Numa Champion RC300 Maintenance manual

MANUFACTURER OF DOWN HOLE HAMMERS AND BITS
©2020 Numa All Rights Reserved
P.O. Box 348 •646 Thompson Road •Thompson, CT 06277 USA
US Toll Free: (800) 356-NUMA •Tel: [phone] •Fax: [phone]
E-mail: [email protected]
Website: www.numahammers.com
Patents 4,530,408 4,919,221 4,962,822 5,205,363 5,984,021 5,992,537 6,021,856 7,422,074
ChampionRC300
CARE & MAINTENANCE
INSTRUCTIONS

Champion
®
RC300
TABLE OF CONTENTS Page
Section I General Description ........................................... 1
Functional Description ............................................................. 2
1. Backhead ........................................................................ 2
2. Connector Pins ................................................................ 2
3. Check Valve Seat........................................................... 2
4. Check Valve .................................................................. 2
5. Check Valve Spring........................................................ 2
6. Collection Tube ............................................................... 2
7. Collection Tube Housing ................................................ 2
8. Belleville Washers .......................................................... 2
9. Feed Tube Housing ......................................................... 3
10. Feed Tube Compression Ring ........................................ 3
11. Feed Tube ........................................................................ 3
12. Piston ................................................................................ 3
13. Case ................................................................................. 3
14. Bit Bearing........................................................................ 3
15. Snap Ring......................................................................... 3
16. Bit Retaining Rings........................................................... 4
17. Thrust Washers ................................................................. 4
18. Chuck............................................................................... 4
19. Chuck Bushing ................................................................ 4
20. Drive Plates ...................................................................... 4
Section II Maintenance................................................................. 5
Disassembly .............................................................................. 5
Inspection.................................................................................. 8
General Assembly.................................................................. 11
Feed Tube Assembly .............................................................. 11
Hammer Assembly ................................................................. 12
Section III Parts Identication ................................................... 14
Challenger RC300 Exploded View................................14 & 15
Part Number Reference .................................................14 & 15
Section IV Air Consumption Chart.......................................... 16
Section V Lubrication................................................................... 17
Section VI Storage......................................................................... 18
Short Term................................................................................ 18
Long Term ................................................................................ 18
Restarting................................................................................. 19
Section VII Button Bit Maintenance ....................................... 20
General.................................................................................... 20
Sharpening .............................................................................. 20
Section VIII Recommended Spares....................................... 21
Challenger RC300 Recommended Spares.......................... 21

04/23/10
MANUFACTURER OF DOWN HOLE HAMMERS AND BITS
WARRANTIES AND REMEDIES
LIMITED WARRANTY
Numa warrants that the Product will be new and free from defects in material and workmanship
under normal use as contemplated by this Contract for a period of six (6) months from the date of
shipment.
Except for the foregoing warranty, Numa disclaims all warranties and representations wherever
made, including warranties of merchantability, durability, length of service, or tness for a particular
purpose.
Any alteration or modication of the original product without the express written consent of
Numa will void this warranty.
REMEDY
If, during such warranty period, Buyer promptly noties Numa in writing of any defect and
establishes that the above warranty is not met, Numa shall either repair or replace the Product or
credit the customer, as it deems necessary to meet the warranty.
Such repair, replacement, or credit of Product shall constitute complete fulllment of Numa's
obligation under this warranty, and upon the expiration of the original warranty period, all of Numa's
obligations hereunder shall terminate.
LIMITATION OF LIABILITY
Numa shall not be liable to Buyer whether in contract, in tort (including negligence and strict
liability), under any warranty or otherwise, for any special, indirect, incidental or consequential loss
or damage whatsoever, including (without limitation) loss arising from delay, cost or capital and loss
of prots or revenues. The remedies set forth in this Contract are exclusive, and the total cumulative
liability of Numa under this Contract or for any act or omission in connection therewith or related
thereto, whether in contract, in tort (including negligence and strict liability), under any warranty or
otherwise, is limited to the price paid by Buyer for the Product.
The WARNINGS, CAUTIONS and NOTES used throughout the text of this
instruction book are dened as follows:
WARNING A specic procedure or practice that must be strictly followed,
or a specic condition that must be met, to prevent possible
bodily harm.
CAUTION A specic procedure or practice that must be strictly followed,
or a specic condition that must be met, to prevent damage
to the equipment.
NOTE Important supplemental information.
Numa®,Champion, and Patriot
are registered trademarks of Numa.

04/21/20 Page 1
Champion
®
RC300
SECTION I
DESCRIPTION
GENERAL DESCRIPTION
The Champion RC300 is a valveless, pneumatically operated reverse circulation drill
designed to utilize Numa 30" to 36" (762 mm to 914 mm) diameter reverse circulation bits in
a wide range of drilling applications.
The Champion RC300 hammer design incorporates a hardened case and a large diameter
collection tube. The large bore design of the Champion RC300 provides high performance
levels as associated with other Numa down hole hammers.
The Champion RC300 was specically designed to provide maximum performance on the
drill rigs that are most commonly used in large diameter drilling applications. The Champion
RC300 hammer is designed to operate using air pressure from 100 PSI to 200 PSI (6.9 Bar to
13.8 Bar) with compressors having 3000 CFM (1417 Litres/Second) or more.
Champion RC300
Weight w/o Bit 11584 lbs. (5266 kg)
Outside Diameter 28" (711 mm)
Hammer Length:
Shoulder to Shoulder 93" (236 cm)
Shoulder to Bit Face 110" (279 cm)
Table 1-1 General Hammer Specications
30" (762 mm) * 3847 lbs. (1749 kg)
32" (813 mm) * 4172 lbs. (1896 kg)
34" (864 mm) * 4497 lbs. (2044 kg)
36" (914 mm) * 5022 lbs. (2283 kg)
Table 1-2 General Bit Specications
* Bit weights are approximate
NOTE
NUMA 30" TO 36" (762 MM TO 914 MM) BITS ARE AVAILABLE IN A CONCAVE
FACE DESIGN WITH A LARGE CENTER COLLECTION TUBE TO TAKE ADVANTAGE OF
THE CHAMPION RC300 PERFORMANCE. OTHER SIZES MAY BE AVAILABLE UPON
REQUEST.

Page 2 04/21/20
Champion
®
RC300
FUNCTIONAL DESCRIPTION
1. BACKHEAD
The backhead connects the hammer to the drill rod. Backheads can be manufactured
to be compatible with several reverse circulation drill rod designs. Please contact your
distributor or regional salesperson for more information. Wrench ats are provided for
disassembly.
2. CONNECTOR PINS
The connector pins are located on the top of the backhead, in the wirth ange. These
pins allow air to ow into the hammer via the adaptor/drill rod.
3. CHECK VALVE SEAT
The check valve seat provides the sealing surface for the check valve and guides the
collection tube.
4. CHECK VALVE
The check valve maintains pressure in the hammer when the air supply has been
shut off. The check valve in the hammer balances the hydrostatic pressure in the hole
thereby preventing contaminants from entering the hammer.
5. CHECK VALVE SPRING
The check valve spring provides tension under the check valve to keep it closed. It is
compressed as the air is turned on.
6. COLLECTION TUBE
The collection tube extends from the backhead to the bit and transfers the collected
drill cuttings to the inner drill pipe of the reverse circulation drill rod. The collection tube
is designed to be easily replaced without removing the backhead from the drill.
7. COLLECTION TUBE HOUSING
The collection tube housing aligns the collection tube. Holes in the collection tube
housing provide the necessary porting supply air.
8. BELLEVILLE WASHERS
Two belleville washers sit between the collection tube housing and the feed tube
housing to keep the feed tube housing tight against the shoulder in the hammer.

04/21/20 Page 3
Champion
®
RC300
9. FEED TUBE HOUSING
The feed tube housing is aligned in the main bore of the hammer. It sits against a
shoulder in the case and is held in position by the backhead, collection tube housing
and belleville washer combination. The feed tube housing locates and aligns the feed
tube.
10. FEED TUBE COMPRESSION RING
A feed tube compression ring sits between the feed tube and the feed tube housing
and keeps the feed tube assembly tight.
11. FEED TUBE
The feed tube supplies the main air into the chambers located in the piston. It seats
on a shoulder in the feed tube housing and is designed with a long bearing surface to
maintain alignment in the feed tube housing.
12. PISTON
The piston functions as the only moving part in the hammer, controlling the operational
air cycle. The percussive action of the piston striking the bit transfers the energy through
the bit in order to fracture rock formations.
13. CASE
The case is designed to contain the internal parts which make up the hammer assembly.
The case is hardened to resist wear and to extend life in abrasive conditions.
14. BIT BEARING
The bit bearing guides the top end of the bit to insure proper alignment between the
piston and the bit. The bit bearing is positioned in the chuck end of the case and is
held in place by the snap ring.
15. SNAP RING
The snap ring sits in a groove in the case and retains the bit bearing.

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Champion
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RC300
16. BIT RETAINING RINGS
The bit retaining rings are designed to allow the bit to move between the drilling and
cleaning positions and prevent the bit from coming completely out of the hammer.
The bit retaining rings consist of two matched halves and are held together with the bit
retaining ring o-ring.
17. THRUST WASHERS
Two brass thrust washers, one located between the backhead and the case and one
between the chuck and the case, provide for easy disassembly.
18. CHUCK
The chuck threads into the bottom end of the case with a large cross section thread
form. It has internal splines that transmit rotation to the bit through a set of delrin drive
plates.
19. CHUCK BUSHING
The chuck bushing is a nylon insert located in the bottom end of the chuck to provide
a bearing surface between the lower bit shank and the chuck.
20. DRIVE PLATES
The plastic drive plates provide wear protection for the splines. They are inserted
between the chuck and the bit. A complete drive plate set (12) is sent with each bit.

04/21/20 Page 5
Champion
®
RC300
SECTION II
MAINTENANCE
DISASSEMBLY
•Maintenance should be performed in a clean environment.
CAUTION
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.
• Tools needed: hammer stand, 26" (660 mm) "J" or fork wrench (possibly incorporated in
the hammer stand), overhead crane or lift truck, pulldown visetong with a 28" (711 mm)
diameter capacity or a self contained power wrench capable of 200,000 foot pounds
of torque, lifting eyes, 2" (51 mm) diameter brass rod or mild steel rod 3 to 5 feet (1 m
to 1.5 m) long, snap ring pliers, chains, lifting slings, a drift pin and several difference
sized screwdrivers.
•Clean the outside of the hammer. This will insure a good surface to clamp on.
•With the hammer in a vertical position, remove the collection tube. The collection tube
is equipped with two 1/2" UNC threads for lifting eyes.
•The collection tube can be replaced without disassembly of the hammer. Prior to
removal of the collection tube, pressure wash the inside diameter of the collection
tube to remove any cuttings or debris. The collection tube is equipped with two 1/2"
UNC tapped holes for lifting eyes to facilitate removal. With the hammer in a vertical
position, use an overhead crane or lift truck of appropriate capacity to remove the
collection tube. Thoroughly lubricate the collection tube O.D. and reverse the process
to install the new collection tube.
CAUTION
FAILURE TO THOROUGHLY CLEAN THE COLLECTION TUBE BEFORE REMOVAL MAY
ALLOW FOREIGN MATERIAL TO CONTAMINATE THE HAMMER.
•Using an overhead crane or lift truck of appropriate capacity, place the hammer on a
hammer stand and secure it in the wrench. The chuck end can be held by the 26" (660
mm) ats, in the wrench. The backhead is also held in the 26" (660 mm) wrench. 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 area of the case where the feed tube housing in located.

Page 6 04/21/20
Champion
®
RC300
CAUTION
THE ACCEPTABLE CLAMPING AREAS START 11.500" (292 MM) FROM EITHER CASE END,
TO AN ADDITIONAL 10" (254 MM) BEYOND THIS POINT. PLACING THE VISETONG ON
THE AREA OF THE CASE WHERE THE PISTON CYCLES CAN DISTORT THE CASE, RESTRICT
PISTON MOVEMENT AND VOID THE WARRANTY.
• With the chuck secured in the fork wrench, (see gure 2-1) loosen the joint by turning
the case with the visetongs. Remove the hammer from the wrench and turn the hammer
end for end in the hammer stand / wrench. With the backhead ats secured in the fork
wrench (see gure 2-1) loosen the joint by turning the case with the visetongs.
• Remove the connector pins from the top of the ange.
•With the crane or lift truck, move the hammer into an upright position with the chuck end
down. With an adequate lifting device, lift and support the hammer while unscrewing the
chuck. After setting the hammer down, and while lifting and supporting the backhead,
unscrew and remove the backhead from the case.
•Remove the backhead o-ring and thrust washer from the backhead.
•Remove the collection tube o-ring from the backhead I.D. on the drill rod mating end.
•Remove the check valve seat, the check valve and the check valve spring from the
backhead end of the case. The check valve seat is equipped with two 1" UNC tapped
holes for lifting eyes to facilitate removal.
Hammer Stand/Wrench Diagram
Figure 2-1
Pulldown Visetongs
Petol No. VTDA120
Force Direction Required:
15,000 - 25,000 lbs.
(6,800 - 11,400 Kg.)
Hammer stand and wrench
combination, structural steel,
I-Beam, weld construction
bracing to suit.
Blocking to height
of stand

04/21/20 Page 7
Champion
®
RC300
•Using a small screwdriver, pick the check valve seat o-ring from the outside diameter
of the check valve seat.
•Remove the collection tube housing. The collection tube housing is equipped with two
1" UNC tapped holes for lifting eyes to facilitate removal.
•Using a screwdriver, pick the two o-rings from the inside diameters of the collection
tube housing.
•Remove the belleville washers.
•Remove the feed tube assembly. The feed tube assembly is equipped with two 1" UNC
tapped holes for lifting eyes to facilitate removal.
•Raise the piston out of the backhead end of the case by inserting two 8" (203 mm)
long, 1.625" (41 mm) diameter steels rods into the holes inside the piston. Put one rod
in the bottom and another rod 180 degrees opposite in the top hole. Lift the piston out
with nylon straps and a suitable lifting device.
•Remove the thrust washer from the chuck.
•Remove the bit retaining rings o-ring from the bit retaining rings.
•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.
•Removal of the bit bearing and snap ring in the chuck end of the case is not necessary
routine maintenance. If necessary, remove the snap ring from the groove. Press the bit
bearing out the chuck end of the case.
•Disassembly of the feed tube assembly is not necessary for routine maintenance. If
necessary, support the feed tube housing and suspend it in the air. Remove the feed
tube snap ring with a large screwdriver. Lower the feed tube assembly until the feed
tube contacts the work bench. The weight of the feed tube housing will let it ride down
the outside of the feed tube. Wrap a nylon strap around the ange of the feed tube
and lift it out of the feed tube housing. Slide the feed tube compression ring off the the
feed tube. (See gure 3-2 for the feed tube assembly exploded view diagram) Place
the feed tube collar toward the work bench. Using a small screwdriver, pick the feed
tube o-ring from the grooves in the feed tube housing and the three orice o-rings from
the inside diameter of the feed tube.

Page 8 04/21/20
Champion
®
RC300
INSPECTION
•All parts should be washed in a clean solvent before they are inspected and
reassembled.
WARNING
USE CLEANING FLUIDS THAT ARE NONFLAMMABLE AND AVOID
BREATHING THE FLUID VAPORS.
•Handle all parts carefully, hardened parts may chip if dropped on a hard surface.
BACKHEAD
•Inspect the threads for cracks and burrs.
• Remove all burrs on the thread with a ne le.
•Replace if necessary.
CHECK VALVE SEAT
•Inspect the outside diameters for nicks, burrs and scoring.
•Remove all minor irregularities with emery cloth.
•Replace if necessary.
CHECK VALVE/CHECK VALVE SPRING
•Inspect the outside diameters for nicks, burrs and scoring.
•Remove all minor irregularities with emery cloth.
•Replace if necessary.
COLLECTION TUBE & COLLECTION TUBE HOUSING
•Inspect the outside diameters for nicks, burrs and scoring.
•Remove all minor irregularities with emery cloth.
•Check the I.D. size (at the chuck end) of the collection tube. The tube I.D. should be
no bigger than 7" (178 mm).
•Inspect the weld at the collar for cracks.
•Replace if necessary.

04/21/20 Page 9
Champion
®
RC300
CONNECTOR PINS
•Inspect for cracks or burrs.
• Remve burss with le or emery cloth.
•Replace if necessary.
BELLEVILLE WASHERS
•Inspect the belleville washers for severe wear indications or cracks.
•Replace if necessary.
FEED TUBE ASSEMBLY
•Inspect all makeup surfaces for indentations or nicks caused by wear.
•Remove all minor irregularities with emery cloth.
•Replace if necessary.
PISTON
•Inspect the striking face, inside and outside diameters for nicks, scoring and cracks.
•Polish the piston with emery cloth to remove all minor irregularities. Cracked pistons
should be replaced.
•Wash the piston thoroughly, inside and out, to remove all emery dust.
•Replace if necessary.
CASE
•Inspect the outside diameter for excessive wear or cracks. Inspect the internal case
bore for scoring.
• Remove all minor irregularities with ne honing stones.
•Clearance between the piston and the case should not exceed 0.030" (0.76 mm).
•Replace if necessary.

Page 10 04/21/20
Champion
®
RC300
BIT BEARING
•Inspect the inside and outside for nicks and burrs.
• Remove all internal irregularities with a ne honing stone.
•Remove all external irregularities with an emery cloth.
•Clearance between the bit shank and bit bearing should not exceed 0.048" (1.21 mm).
•Replace if necessary.
SNAP RING
•Inspect the snap ring for severe wear indicators. Replace if necessary.
BIT RETAINING RINGS
•Inspect for cracks or deformations.
• Remove all irregularities with a le or emery cloth.
•Replace if necessary.
THRUST WASHERS
•Inspect for damage such as cracks and deformations. Replace if necessary.
CHUCK
•Inspect for cracks and burrs.
•For continued use, the outside diameter should be larger than the outside of the case
or the same. Collar length should not be less than 6.750" (172 mm).
CAUTION
IF THE COLLAR LENGTH IS LESS THAN 6.750" (172 MM) AND THE BIT IS
UNDER LOAD CONDITIONS, CONTACT BETWEEN THE SHOULDER OF
THE BIT RETAINING RINGS AND THE BOTTOM OF THE BIT RETAINING
RING AREA ON THE BIT, COULD CAUSE THE BIT TO FAIL IN THIS AREA.
•Torsional play in the splines should not exceed 0.375" (9.5 mm).
•Replace if necessary.

04/21/20 Page 11
Champion
®
RC300
GENERAL ASSEMBLY INSTRUCTIONS
•Assembly should be performed in a clean environment.
•All parts should be cleaned thoroughly and wiped dry before assembly.
•Oil all parts by hand using Rock Drill Oil to insure easy assembly.
• Coat all thread connections and thrust washers with a thread compound to allow joints
to thread easily.
FEED TUBE ASSEMBLY
•Install the two feed tube o-rings in the two grooves located in the smallest inside
diameter of the feed tube housing.
• Insert the three orice o-rings into the groove at the inside diameter of the feed tube.
•Place the feed tube compression ring over bottom end of the feed tube, then slide it
along the feed tube until it seats against the feed tube collar.
•Position the piston vertically. Place the smallest outside diameter of the feed tube
housing on the piston so that the bores will align. Insert the small end of the feed tube
into the feed tube housing. Slide the feed tube into the feed tube housing until the feed
tube compression ring seats against the feed tube housing shoulder. While applying
pressure to the feed tube collar to expose the snap ring groove, use a large screwdriver
to insert the feed tube snap ring. Remove the feed tube assembly from the piston.
CHUCK BUSHING
•Inspect for damage such as cracks and deformations. Replace if necessary
O-RINGS
•Inspect for damage such as cracks and deformations. Replace if necessary.
DRIVE PLATES
•Inspect for damage such as cracks and deformations. Replace if necessary.

Page 12 04/21/20
Champion
®
RC300
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 t.
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 steel
rods, 1.625" (41 mm) diameter steel rods and the nylon straps.
• Install the feed tube assembly into the backhead end of the case, making sure it is
rmly 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 wahsers 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.
• Install the connector pin o-rings on the connector pins. Using a soft blow hammer, seat
the (2) connector pins into the ange openings on the top of the backhead.
NOTE
DUE TO THE INTERNAL COMPRESSION SPRINGS, THE CHAMPION RC300 BACKHEAD
CAN ONLY BE FULLY TIGHTENED WITH A POWER WRENCH ON THE RIG.

04/21/20 Page 13
Champion
®
RC300
RC300 Drive Plate Positioning as Viewed from Top
Figure 2-2
CAUTION
LIFTING THE CHAMPION RC300 HAMMER WITH THE THREAD JOINTS LOOSE MAY
CAUSE DAMAGE TO THE THREADS.
• Install the chuck bushing in the chuck. With the bit face down, place the chuck over
the top of the bit. Align the splines and lower the chuck completely onto the bit. Rotate
the chuck counterclockwise until the splines meet and insert the drive plates between
the chuck and bit splines. (See Figure 2-2)
•Place the bit retaining rings, with the o-ring installed, over the chuck.
• Place the thrust washer against the chuck thread shoulder. Thread the chuck into the
case and hand tighten. The chuck should sit at against the end of the case.
• With the hammer in a vertical position and the bit installed, insert the collection tube.
NOTE
THE COLLECTION TUBE SHOULD BE ASSEMBLED WITH THE BIT INSTALLED IN THE
HAMMER AS THE COLLECTION TUBE, WHEN ASSEMBLED, PROTRUDES FROM THE
BOTTOM OF THE HAMMER 6.500" (165 MM).
NOTE
LUBRICATING THE OUTSIDE DIAMETER OF THE COLLECTION TUBE PRIOR TO ASSEMBLY
IS NECESSARY TO FACILITATE ASSEMBLY.
CAUTION
DUE TO CLOSE TOLERANCES BETWEEN THE CHAMPION RC300 INTERNAL PARTS AND
THE CASE, NUMA CANNOT ACCEPT RESPONSIBILITY FOR DAMAGED CAUSED BY
WELDING ON THE CASE OD. WELDING ON TEH CASE CAN CREATE DISTORTION,
CAUSE PREMATURE FAILER AND VOID THE WARRANTY. CONTACT NUMA FOR
SPECIAL INSTRUCTIONS IF WELDING THE CASE BECOMES UNAVOIDABLE.

Page 14 04/21/20
Champion
®
RC300
SECTION III
PARTS IDENTIFICATION
EXPLODED VIEW
HAMMER ASSEMBLY #019083
Figure 3-1
Case
015065 (1)
Bit Bearing
008909 (1)
Snap Ring
008911 (1)
Bit Retaining Rings
008910 (1)
Bit Retaining Rings
O-Ring
008913 (2)
Thrust Washer -
Brass
008925 (2)
Chuck
008904 (1)
Chuck Bushing
008908 (1)
Check Valve
008915 (1)
Check Valve Spring
008916 (1)
Collection Tube Housing
O-Ring
008918 (1)
Collection Tube O-Ring
008919 (2)
Collection Tube Housing
008917 (1)
Belleville Washer
008921 (2)
See Exploded View
Figure 3-2
Page 15
Piston
008906 (1)
Collection Tube
018573 (1)
Collection Tube O-Ring
008919 (2)
Connector Pin
013613 (2)
Connector Pin O-Ring
005895 (4)
Backhead
008907 (1)
Backhead O-Ring
008913 (2)
Thrust Washer - Brass
008925 (2)
Check Valve Seat
0089147 (1)
Check Valve Seat
O-Ring
008926 (1)
Exploded View of
Belleville Washers
Correct Stacking

04/21/20 Page 15
Champion
®
RC300
SECTION III
PARTS IDENTIFICATION
EXPLODED VIEW
Feed Tube Snap Ring
008928 (1)
Feed Tube
008929 (1)
Orice O-Ring
008919 (3)
Feed Tube Compression Ring
008930 (1)
Feed Tube O-Ring
008931 (2)
Feed Tube Housing
008912 (1)
FEED TUBE ASSEMBLY #008922
Figure 3-2

Page 16 04/21/20
Champion
®
RC300
SECTION IV
AIR CONSUMPTION CHARTS
CHAMPION RC300
7200
6400
5600
4800
4000
3200
2400
1600
3398
3021
2643
2265
1888
1512
1132
756
CFM
L/SEC
DRILL PRESSURE (BAR)
6.9 10.3 13.6 17.2
DRILL PRESSURE (PSI)
100 150 200 250
1
2
ORIFICE O-RING
ORIFICE O-RING
INSTALLED1 REMOVED
2
* Operation Above 250 PSI (17 BAR) Is Not Recommended.
NOTE
Numa RC hammers utilize an orice o-ring as a choke. Removal of the orice
o-ring allows additional air to pass through the hammer for hole cleaning/
ushing purposes.