JCR DTH HAMMERS BUTTON BITS
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JCR Series Hammer

SPECIFICATIONS
Hammer Name JCR 4 3/4 JCR 60 JCR 65
Part Number H475JCR H60JCR H65JCR
Outside Dia (mm) 103.00 140.00 148.00
Recomm. Bit size (mm) 120.60 to 140.00 152.40 to 216.00 165.10 to 228.60
To Sub Thread (IN) 2-7/8 Reg Pin 2-7/8 Reg Pin 2-7/8 Reg Pin
Ham. Wt. without Bit (Kg) 40.00 73.50 83.50
Total Len. without Bit (mm) 960.0 1005.0 1005.0
Wrench Flat (mm) 74.00 90.00 90.00
Working Pressure (Bar) 7.5 - 21 10.5 - 24 10.5 - 24
 
Component Name H475JCR H60JCR H65JCR
Piston Case/Barrel HB475JCR HB60JCR HB65JCR
Piston HP475JCR HP60JCR HP65JCR
Control Tube HCT475JCR HCT60JCR HCT60JCR
Top Sub / Back Head HC475JCR HC60JCR HC65JCR
Driver Sub / Front Chuck HFC475JCR HFC60JCR HFC65JCR
Air Distributor HAD475JCR HAD60JCR HAD60JCR
Guide Sleeve / Assembly Bush HAB475JCR HAB60JCR HAB65JCR
Bit Retainer Ring / Bit Lock HBL475JCR HBL60JCR HBL65JCR
Dart / Bonded Check Valve HBCV475JCR HBCV60JCR HBCV60JCR
Retainer Pin / Dowell Pin HDP475JCR HDP60JCR HDP65JCR
Spring HS475JCR HS60JCR HS60JCR
Circlip HCL475JCR HCL60JCR HCL65JCR
Bit Lock O Ring HOR475JCR HOR60JCR HOR60JCR
Choke HBC475JCR HBC60JCR HBC60JCR
O Ring / Assembly Bush O Ring HABOR475JCR HABOR60JCR HABOR60JCR
Front Chuck Rubber Cap HFCRC475JCR HFCRC60JCR HFCRC60JCR
Back Head Rubber Cap HCRC475JCR HCRC60JCR HCRC60JCR

SPECIAL FEATURES
•   For use in hard rock application
•   Valve less DTH Hammer design
•   Reversible wear sleeve(cylinder)
•   Less number of components
•   Can work on low to high pressure radius
•   High rate of penetration while utilising less air
•   Excellent under water characteristics

GENERAL CARE
Before shutting down at the end of each shift, we recommend the following procedures:
  1. Flush Hammer with air/water for a few minutes, then turn off water injection
  2. Flush Hammer with air/oil for a few minutes.  This will coat the internal Hammer parts preventing corrosion/rust.
  3. Never leave the tool in a wet / muddy hole.  Pull back from bottom as far as necessary to prevent the Hammer sitting under water.
  4. It is also good practice to pour at least half a litre of oil down the drill at start up of a new shift.
  5. If the Hammer is removed from the drill rig for any reason, it is wise to pour a quantity of oil into it and block both ends, providing the flushing as outlined in steps one and two above have been carried out.  If steps one and two have not been carried out the Hammer should be stripped, cleaned and oiled before being stored.
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