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Numa Champion RC300 Care & Maintenance Instructions

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P.O. Box 348 • 646 Thompson Road • Thompson, CT 06277 USA
US Toll Free: (800) 356-NUMA • Tel: (860) 923-9551 • Fax: (860) 923-2617
E-mail: numa@numahammers.com
Website: www.numahammers.com
©2020 Numa All Rights Reserved
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

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  • Page 1 P.O. Box 348 • 646 Thompson Road • Thompson, CT 06277 USA US Toll Free: (800) 356-NUMA • Tel: (860) 923-9551 • Fax: (860) 923-2617 E-mail: numa@numahammers.com Website: www.numahammers.com ©2020 Numa All Rights Reserved 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...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Page Section I General Description ........... 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.
  • Page 4 If, during such warranty period, Buyer promptly notifies 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.

  • Page 5: Section I General 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.

  • Page 6: Functional Description

    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 flats are provided for disassembly.

  • Page 7: Feed Tube Housing

    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.

  • Page 8: Bit Retaining Rings

    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.

  • Page 9: Section Ii Maintenance

    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.
  • Page 10 Force Direction Required: 15,000 - 25,000 lbs. Pulldown Visetongs (6,800 - 11,400 Kg.) Petol No. VTDA120 Hammer stand and wrench Blocking to height combination, structural steel, of stand I-Beam, weld construction bracing to suit. Hammer Stand/Wrench Diagram Figure 2-1 CAUTION THE ACCEPTABLE CLAMPING AREAS START 11.500"...
  • Page 11 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 •...

  • Page 12: Inspection

    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. •...
  • Page 13 CONNECTOR PINS Inspect for cracks or burrs. • Remve burss with file 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.
  • Page 14 BIT BEARING Inspect the inside and outside for nicks and burrs. • Remove all internal irregularities with a fine 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). •...

  • Page 15: General Assembly

    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 16: Hammer Assembly

    • the (2) connector pins into the flange 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. Champion RC300...
  • Page 17 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.

  • Page 18: Section Iii Parts Identification

    SECTION III PARTS IDENTIFICATION EXPLODED VIEW Case Check Valve 015065 (1) 008915 (1) Collection Tube Check Valve Spring 018573 (1) 008916 (1) Collection Tube Housing O-Ring 008918 (1) Collection Tube O-Ring 008919 (2) Collection Tube Housing Bit Bearing Collection Tube O-Ring 008917 (1) 008909 (1) 008919 (2)
  • Page 19 SECTION III PARTS IDENTIFICATION EXPLODED VIEW Feed Tube Snap Ring 008928 (1) Feed Tube 008929 (1) Orifice 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 Champion RC300...

  • Page 20: Section Iv Air Consumption Chart

    INSTALLED * Operation Above 250 PSI (17 BAR) Is Not Recommended. NOTE Numa RC hammers utilize an orifice o-ring as a choke. Removal of the orifice o-ring allows additional air to pass through the hammer for hole cleaning/ flushing purposes.

  • Page 21: Section V Lubrication

    The Champion RC300 hammer requires a continuous supply of the correct type Rock Drill Oil. The Champion RC300 hammer consumes at least 20 quarts (19 litres) of Rock Drill Oil per hour in order to maintain adequate lubrication. See table 5-1 for recommended Rock Drill Oil.

  • Page 22: Section Vi Storage

    SECTION VI STORAGE When storing a Champion hammer, it is important to take the necessary steps in order to insure a smooth operation after restarting. When the hole is completed and the hammer is to be inactive for several weeks or longer the following steps should be followed: Each drill rod should be blown clear of all water.

  • Page 23: Restarting

    Lubricate all the internal parts with Rock Drill Oil. See table 5-1 on page 16 for suitable • Rock Drill Oils. Cap the backhead and chuck ends. • Store the hammer horizontally in a dry environment. • RESTARTING Before restarting the hammer after prolonged periods of inactivity, disassemble and inspect all internal hammer parts.

  • Page 24: Section Vii Button Bit Maintenance

    BUTTON BIT MAINTENANCE GENERAL Numa button bits are designed for fast penetration and long life. Keeping the carbide buttons sharp has a direct effect on both the penetration and the tool life. As the bit wears flat, spots develop on the carbide buttons. These flat spots increase stress on the buttons causing the bit to work harder, which may cause button failure.

  • Page 25: Section Viii Recommended Spares

    For Complete Hammer Assembly #019083 Table 8-1 NOTE Class 1 Represents a user of a Champion RC300 hammer that has readily available spare parts. Class 2 Represents a user of a Champion RC300 hammer that does not have readily available spare parts.
  • Page 26 NOTES Champion RC300 Page 22 04/21/20 ®...
  • Page 27 NOTES Champion RC300 04/21/20 Page 23 ®...

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