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Numa CHALLENGER 6 Instructions Manual

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6
CARE & MAINTENANCE
INSTRUCTIONS
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
©2023 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 CARE & MAINTENANCE INSTRUCTIONS 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 ©2023 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

    Feed Tube Assembly .............. 11 Hammer Assembly ..............11 Section III Parts Identification ........... 13 Challenger 6 Exploded View ..........13 Challenger 6 Part Number Reference ........13 Section IV Air Consumption Chart .......... 14 Section V Lubrication ..............15 Section VI Storage .................
  • 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

    SECTION I DESCRIPTION GENERAL DESCRIPTION The Challenger 6 is a valveless, pneumatically operated tool designed to utilize Numa 6" to 8-1/2" (152 mm to 216 mm) diameter bits in rock formations under a wide range of operating conditions. The Challenger 6 hammer design incorporates a hardened, reversible case. The simple design of the Challenger 6 provides performance and dependability without sacrificing tool life.

  • Page 6: Functional Description

    FUNCTIONAL DESCRIPTION BACKHEAD The backhead connects the hammer to the drill rod. It is threaded into the top end of the case with a large cross section thread form and into the drill rod with a standard 3-1/2 REG API thread. Other threads are available upon request. Wrench flats are provided for disassembling.

  • Page 7: Choke

    FEED TUBE The feed tube supplies the main air into the chambers located in the piston. The feed tube collar seats against the feed tube compression ring which locates against a shoulder in the feed tube housing. The feed tube is held in place by a feed tube snap ring located above the feed tube collar.

  • Page 8: Washer

    WASHER The washer is located between the disc springs and the retainer. The washer is used to provide an area to seat the disc springs. RETAINER The retainer is a hardened steel ring with a 3/4" (19mm) space to allow it to be compressed when installing it in the case.

  • Page 9: Section Ii Maintenance

    CAUTION USE CAUTION WHEN HANDLING DOWN 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.
  • Page 10 Remove the thrust washer from the chuck. • Remove the bit retaining rings o-ring from the bit retaining rings. • Use the snap ring pliers to remove the retainer, then remove the washer and the four • disc springs. Using a 2" (51mm) diameter brass rod, slide the piston against the feed tube assembly •...
  • Page 11 Disassembly of the feed tube assembly is not necessary for routine maintenance. If • necessary, with the choke end of the feed tube against the work bench, apply down- ward pressure toward the work bench. This will cause the feed tube to protrude from the backhead end of the feed tube housing.

  • 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 CASE Inspect the outside diameter for excessive wear or cracks. Inspect the internal case • bore for scoring. Remove all minor irregularities with fine honing stones. • Clearance between the piston and the case should not exceed 0.015" (0.38 mm). •...
  • Page 14 Replace if necessary. • O-RINGS Inspect for damage such as cracks and deformations. • Replace if necessary. • THRUST WASHERS Inspect for damage such as cracks. • Replace if necessary. • Page 10 03/09/23...

  • Page 15: General Assembly

    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 with a thread compound to allow joints to thread easily. •...
  • Page 16 Screw the backhead into the case and hand tighten. CAUTION DUE TO THE CLOSE TOLERANCES BETWEEN THE CHALLENGER 6 INTERNAL PARTS AND THE CASE, NUMA CAN NOT ACCEPT RESPONSIBILITY FOR DAMAGE CAUSED BY WELDING ON THE CASE OD. WELDING ON THE CASE CAN CREATE DISTORTION, CAUSE PREMATURE FAILURE AND VOID THE WARRANTY.

  • Page 17: Section Iii Parts Identification

    SECTION III PARTS IDENTIFICATION EXPLODED VIEW Backhead 3-1/2 Reg. Pin 015357 (1) Backhead O-Ring 005742 (1) Thrust Washer - Brass 005478 (2) Case Check Valve 005268 (1) 011833 (1) Check Valve Spring 011615 (1) Check Valve Housing 005022 (1) Bit Bearing Compression Ring 005005 (1) 005083 (1)

  • Page 18: Section Iv Air Consumption Chart

    SECTION IV AIR CONSUMPTION CHART CHALLENGER 6 DRILL PRESSURE (BAR) 13.6 20.4 27.6 34.5 2000 1800 1600 1400 1200 1000 94.4 DRILL PRESSURE (PSI) SOLID CHOKE 3/16 (4.8mm) CHOKE 1/8 (3.2mm) CHOKE 1/4 (6.4mm) CHOKE Page 14 03/09/23...

  • Page 19: Section V Lubrication

    As an alternative to Rock Drill Oil, Numa Enviro Lube provides continuous protection for the Challenger 6 when 3 oz. (.09 litres) are used every 300' (92 m) or four hours of drilling, whichever occurs first. Numa Enviro Lube is utilized in 3-1/2" to 6" hammers only.

  • Page 20: Section Vi Storage

    SECTION VI STORAGE When storing a Challenger 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 21: Restarting

    Lubricate all the internal parts with Rock Drill Oil. See table 5-1 on page 15 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 22: 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 23: Section Viii Challenger 6 Recommended Spares

    Table 8-1 NOTE Class 1 Represents a user of a Challenger 6 hammer that has readily available spare parts. Class 2 Represents a user of a Challenger 6 hammer that does not have readily available spare parts. 03/09/23 Page 19...
  • Page 24 NOTES Page 20 03/09/23...

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