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.

Page 4 04/21/20
Champion
®
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