Service Manual - Hardrock HDDP
Contents
1. i od gt 3 2 HDD50 Hammer Service Log WEARSLEEVE PISTON CLEARANCE Part As New Dimension AS Wear Measured Discard Measured Clearance Clearance 3 080 78 23mm Dy 58 jen 200157 C D dd Piston OD 3 075 78 10mm ume 80 025m IKK FAW Chuck end ISSS lx SSS delay INNER CYLINDER PISTON CLEARANCE Part As New Dimension AS Wear Measured Discard Measured Clearance Clearance CylinderID 2 678 68 03mm C Piston OD 2 673 67 90mm C D ep e emm CSS mm P IST Vc J J DMiUMU Leaders in the Field of Drilling Technology Page 25 of 27 VA u i gt 7 Pir 65 8 x3 DISTRIBUTOR PROBE PISTON ID CLEARANCE Measured Clearance Clearance ef Probe OD gt 0 010 me preamp i Narrow End RXTE SAAR OSS SS lt lt LE BSCS GG W W W miil uil Leaders in the Field of Drilling Technology Page 26 of 27 DIRECTIONAL DRILLING HDDP 4 Warranty Hardrock Directional Drilling Hammers Warranty January 2005 Hardrock warrants that the Hardrock Directional Drilling Systems and spare parts therefore manufactured by Hard2. DIREC TIONAL DRILLING HDDP Insert and push the DCI Sonde into the DCI Fit the DCI Adaptor Locating cap onto the DCI Adaptor Sonde ensuring the Locating cap s intrical key is seated correctly in the Sonde Keyway Sten8 Step 9 Step 10 Push the Sonde in the rest Insert first spring into Insert the DCI Adaptor Insert the second spring of the way and screw the into the Sonde into the Sonde Carriage in to the Sonde DCI Adaptor Locating Cap Carriage Carriage in and tighten snugly with a wrench 5 in ot Drilling ORR Pu Eesti Sonde Carriage Locating Groove DCI Adaptor Locating Dimple Align the Sonde Carriage Locaing Cap Groove with the DCI Adaptor Locking Dimple and push the cap on so that the hex socket of the Carriage Locaing Cap fits over the DCI Adaptor and then screw the Carriage Locking Cap in place Above picture shows the Sonde Carriage Locating Pin The pin is in the Bent Sub set so that the Push the Sonde carriage into the Sonde Housing Sleeve with the Sonde Carriage Locating cap entering first place Sonde will be aligned correctly in the twelve 1 position Screw the Retrieval bar into the Sonde Carriage and push forward until it stops Turn gently until you feel the Sonde Carriage go forward and the Sonde Carriage Locking Cap groove seats over the Sonde Carriage Locating pin See Step 14 for details of the pin Insert and screw
3. 500 Pressure PSI The recommended grade of oil is dependent on the ambient temperature in which drilling is taking place as well as the operating pressure As a rule of thumb ISO320 grade rock drill oil should be used whenever possible as the hammer is a high frequency tool however where the pump cannot pump the in colder conditions a lower grade of oil can be used as per the graph above Remember Insufficient lubrication or incorrect lubrication grades may result in damage being caused to the hammer and it s components Hydraulic oils engine oils gear oils and diesel are not recommended for lubricating DTH hammers Leaders in the Field of Drilling Technology Page 19 of 27 2 2 6 Operation of Hammer Be sure to familiarize yourself with the controls of the machine and work in accordance with the manufacturers recommendations The percussive mechanism begins to operate as the air supply is turned on and when the drill bit is pushed firmly into the hammer Excessive thrust pressures are not needed to make it work The thrust controls on the drill should be adjusted to the correct pressure and should be readjusted to take account of the weight of any extra tubes added so that the thrust pressure remains constant and not excessive Insufficient thrust pressure will make the hammer drill erratically and less efficiently and cause premature wear to the bit and chuck splines with likely damage to the hammer components and th
4. a soft headed mallet When beginning to hit the assembly ensure that it goes in square Using a steel dolly on top of the air distributor and inside the wear sleeve drive the assembly into place with a sledgehammer Place the lock ring in on top of the air distributor and then the Steel Makeup Ring on top of that Insert the spring and check valve in place and finally screw the backhead in place With the backhead in place there should be a small gap between the backhead and the wearsleeve This gap should be between 0 015 and 0 030 and can be measured using a feeler gauge If the gap is less than the minimum then the lock ring will need to be replaced Protect the hammer as earlier described by internal lubrication Leaders in the Field of Drilling Technology Page 23 of 27 e US D CN E R gt 3 Appendix 3 1 HDD50 exploded view and Parts List HARDROCK HDDSO PARTS LIST AND SPECIFICATIONS HARDROCK HDDSO HAMMER HRHDAOTASOT SONDE HOUSING ASSEMBLY HRHS401AS01 is f 17 9 HRHS4ziORO Pp 8 ORING HRHS4ziORO 9 SONDEHOUSINGSLEEVE HRHS404SHO1_ 20 WP 1 CHOKE 1 8 3 2mm HRBs06cHO2 _ CHOKE 4 8mm HRBs06cHOS _ fer 50608 emm CH gc y Leaders in the Field of Drilling Technology Page 24 of 27 DIRECTIONAL DRILLING HDDP 7 2 A
5. and discharge lines Enlarge loop on the other end of the whip check on the air intake valve end and loop over air hose and release When completed pull whip checks back so that they are as shown above Above picture shows air inlet side of support station Connect air hose to Support Station air intake valve Ensure all connections are tightened properly amp i HARDR pen Connect air hose to the Connect TRI Light controller Before Operation check level compressor in the same connections to electric valve of oil in the water pump with manner Connect other air dip stick shown above Top off hose to Support Station with approved crankcase oil as discharge line and to Drill necessary Leaders In of Drilling Page 12 of 27 CAUTION Always follow these instructions when filling tank with rock drill oil 1 Turn compressor off and shut valve off at compressor 2 Turn electric valve off make sure you see a red light on the Tri Lite Controller and Red or Yellow indicator on the top of valve is pointing perpendicular to valve body 3 Open vent valve Labelled 1 Vent Valve above on far right side of front panel slowly relieving air pressure inside of tank to atmospheric air pressure 4 After air has bled out of tank use hammer to hit four inch hammer fitting on top of tank counter clockwise to loosen and then take off by hand 5 Fill oil to top of tank but not past fitting in the midd
6. contract negligence warranty indemnity or otherwise shall not exceed the purchase price of the product upon which such liability is based Hardrock and its distributors shall in no event be liable to any party relating to this sale for any consequential indirect special or punitive damages arising out of this sale or any breach thereof or any defects in or failure of or malfunction of the Hardrock DTH Hammer or spare parts Warranty will be voided where There is evidence of damage resulting from insufficient or incorrect lubrication There is evidence of misuse through the application of heat welding or of being struck There is evidence of distortion or bending however caused There is damage caused as a result of using incorrect servicing tools or procedures If it is evident that the hammer or its components have achieved a reasonable proportion of their anticipated life Leaders in the Field of Drilling Technology Page 27 of 27
7. is dependent on the amount of wear the critical components have These should be measured and recorded in the Service log in the appendix The service log gives the location of where measurements should be made Depending on how many parts need to be replaced it may be economical to replace the hammer all together 2 3 7 Reassembly The hammer can be reassembled in the following manner referring to the exploded view of the hammer in the appendix Ensure all components are liberally coated with good quality rock drill oil and threads with thread grease After identifying which end will be the chuck end fit the piston retaining ring in this end This can be pushed into place using a small bar or screwdriver to ensure that it 1s seated correctly Place the bit retaining rings in and screw the chuck in place Again make sure to have the thin end of the bit retaining rings at the blow tube end of the bit Turn wear sleeve over with the chuck on the floor and drop the piston in with the strike face in first Again ensure that fingers do not get caught between the wear sleeve and the piston Place the three piece seating ring on the inner cylinder and secure in place with the seating ring O Ring Insert The Air distributor into the inner cylinder at the seating ring end and using a soft headed mallet tap it into place so that it seats up against the top of the inner cylinder Place the inner cylinder assembly into the wear sleeve and tap down with
8. to close the valve fully and then turn one revolution counter clockwise Oiler valve one and 2 valve 1 to right of oiler knob valve 2 left of vent must be open for proper operation During drilling the two CAUTION At the end of the days drilling Valves should be on and then turn turn the valves off or you will be wasting oil Valves off after drilling is complete The oiler will continue to oil whether each day compressor is on or off Itis recommended on a new system until the operator 1 familiar with the system that after each rod is drilled 14 cup or two ounces of rock drill oil should be poured in each rod especially if a new hammer is being commissioned 09 05 2011 12 48 pm Leaders in the Field of Drilling Technology 16 of 27 BL TA DIRECTIONAL DRILLING HDDP 772 F aiir ed E i Water Pump Adjustment and Operation Always prime water hose before connecting cam lock to the pump It 1s essential to have the water tank above the support station to maintain sufficient head pressure for the pump to operate The water pump is powered by an air operated motor coupled to the water pump The amount of water being introduced into the drilling operation 1s controlled using the valve on the top right of the water hole control panel The amount of required to maintain a clean will be dependent on drilling conditions Approximately 3 4 1 VENT gallo
9. HARDR CK DIRECTIONAL DRILLING HDD50 Hardrock Horizontal Directional Drilling System JO DISIJ U Hardrock Directional Drilling iA a aa HDDP TABLE OF CONTENTS Table NER me 1 Introduction esessesccsocoecoesoccocoocoecoccoccocoesoesoccocoosoecoesoccocoesoesoess 3 2 Installation and Operation ccsscccccsssccccssscccsssscccsssscccsssee 4 ZW AS 4 2 2 Setup of HDD50 Hammer and Sond ccccccccccccssssssssscsccccccccccsssssssceseccees 4 2 2 1 4 2272 SOPO SONU ari m 4 2 2 3 EI 9 2 3 Setup and Operation of Support Station cccssscscccccccsssssccccccccssssssccceessess 11 2 3 4 Set up of Support Station esee esee esee eee ee esent eese eese esee essa ananas 4 2 3 2 Equipment Inspection Prior to Compressor Ignition I4 2 3 3 Pressure Regulator Adjus tment I5 2 3 4 TIT 16 2 3 5 Water Pump Adjustment and Operaution 17 2 3 6 Commissioning of Hammer eee ettet etate eee eese e eese 18 2 3 7 Lub PRSE 19 2 3 8 Operation of RITATEM 20 21 2 4 1 E E 21 2 4 2 Opening Chuck and 21 2 4 3 Dism
10. age may be caused to the components which could result in eventual failure or affect the performance of the Hammer When using Petol wrenches or similar systems ensure that the wrench is not placed on the threaded section of the wear Sleeve Petol wrench jaws should be carbide and in good condition It is good practice to keep a spare set of jaws with the rig Do not strike or hit the outer components as this could weaken the heat treated steels Hitting the hammer may also cause hard metal fragments to be chipped off which may be projected and cause personal injury or eyesight loss Do not apply heat to the hammer as this can alter the metallurgical composition and result in premature failure Additionally applying heat can also cause distortion to the wear sleeve which in turn would lead to failure Do not trap the hammer under drill rig tracks or vehicle wheels which could cause bending and distortion of the hammer body Failures caused by these actions cannot be supported by warranty Take care when dismantling the hammer to make sure that parts and drill bits do not become detached and cause damage or personal injury 2 3 3 Dismantling Hammer to Change Drill Bit When possible dismantling the Hammer to change the drill bit is preferably best done in a workshop environment to avoid the risk of injury and for cleanliness Be careful to ensure that the drill bit and chuck are fully supported together so that there is no risk of them becoming d
11. antling Hammer to Change Drill Bit 21 2 4 4 Disassembly for Full Servicing of 22 2 4 5 22 2 4 6 Checking Wear Limits 23 2 4 7 23 3 Appendix OEE 31 HDDS50 exploded view and Parts List ssssssssscccccssssssssssssccccccccccsssssscssees 24 3 2 HDDSO Hammer Service Log 25 WY CICER Leaders in the Field of Drilling Technology Page 2 of 27 DIRECTIONAL DRI NG HDDP D 7 Men 1 1 Introduction This document covers the HDD50 Horizontal Directional Drilling System The system consists of the following HDD50 Horizontal DTH Hammer Support Station Compressor Water supply The basic setup is shown below Horizontal Directional Drill with Support Pack HDD50 OTH Hammer Rock Drill Oil Injection Water injection Compressor to Drill Compressor 900scfm 350spsi Water Truck Dust Control Sonde Cooling 2 4 Gal Min The Installation and Operation section will deal with setup of the system and basic operation Following that we will deal with disassembly and servicing When dealing with the HDDS50 in the service section we will separate it into two parts Firstly the Down the Hole hammer component that makes drilling possible and secondly the Sonde housing component that makes steering possible Leaders in the Field of Drilling Technology Page 3
12. etached and causing injury This can occur if the O Ring on the bit retaining rings is missing or damaged Before fitting a new drill Leaders in the Field of Drilling Technology Page 21 of 27 iA a aa DRILLING HDDP bit visually inspect the splines of the chuck and the piston striking face to ensure that both are not damaged in any way Fit new bit as described in section 2 2 3 above 2 3 4 Disassembly for Full Servicing of Hammer Breakout the Chuck and Backhead as described previously Unscrew chuck and remove bit and bit retaining rings Unscrew the backhead and check to see if the check valve and spring are operating correctly and then remove them Mark one end to identify either the chuck or backhead end for reassembly latter Stand hammer up with the chuck end uppermost Using a mild steel bar tap the strike face of the piston to remove the air distributor and inner cylinder The steel make up ring and lock ring should fall out during this process 1 so remove them and continue until the top of the air distributor is at the top of the wear sleeve The hammer can now be placed flat on the ground or put up onto a suitable vice and using the mild steel bar hit the piston strike face from the chuck end to completely remove the air distributor inner cylinder and piston The piston retaining ring can be removed by using a mild steel bar and hitting the section opposite the gap on the ring which will ride up the taper on the
13. g ensuring no debris or dirt enters the hammer from the site dirty tubes or from unclean air lines Make sure that the coupling threads from the drill are of the same specification to that of the hammer and they are in good condition Run the hammer at half the air flow for a few minutes to allow the oil to flow through and for internal components to settle in Leaders in the Field of Drilling Technology Page 18 of 27 2 2 5 Lubrication It is vital for DTH hammers to receive a constant supply of proper rock drill oil to protect the internal components and to provide a good air seal between the piston and the inner cylinder and the piston and the wear sleeve for efficient drilling The correct consumption of oil is dependent upon the air volume and conditions Please refer to the lubrication graph below for recommendations When drilling in wet conditions the normal amount should be doubled Litres Hour 05 1 1 5 2 0 25 Air Volume CFM NIIN IA Ary 1 2 3 4 5 US Pints Hour In wet drilling above 2gpm 8 Ipm the oil consumption should be doubled There should be visual evidence of oil around the drill bit shank and within the tube joints when changing tubes Pressure Bar 6 9 13 8 20 7 27 6 34 5 120 48 9 100 mM SN 37 8 gt 3 3 267 S e e 2 15 6 5 e 44 R 0 150150 j 4 e ISO46 l 28 9 100 200 300 400
14. il should be poured into the top of the hammer and let flow down into the piston chamber of the hammer to coat the parts and protect them from rust and corrosion Once completed the bent sub and the Sonde Housing can be reinstalled Ensure that the thread protector and chuck cap are fitted to keep debris out and to prevent oil leakage Store the hammer horizontally in a clean dry place 2 2 2 Setup of Sonde When the HDD50 is supplied it will contain the necessary parts for the successful installation of a commercial Sonde The two main types of Sonde are dealt with in this manual DCI Sonde and Sub Sight Leaders in the Field of Drilling Technology Page 4 of 27 2 2 2 1 Installation of DCI Sonde The following series of picture will detail the installation of a DCI Sonde into the HDD50 The same procedure should be used for servicing or changing the sonde at a later date STEP 1 STEP 2 Unscrew and remove Sonde Housing Backhead Insert and screw the retrieval bar into the Sonde from the Sonde Housing Sleeve Carriage retrieval cap and pull out the complete Sonde Carriage assembly Step 3 Step 4 Unscrew and remove the Sonde Carriage Locating Loosen and remove the DCI Adaptor Locating Cap Springs and the DCI Adapter from the Sonde cap from the DCI Adaptor Correct end has Carriage Opposite end to the Sonde Carriage locating dimple retrieval cap In Beall Line of Drilling Technology Page 5 of 27 ah pe s cru
15. le of the neck 6 Refit Oil tank cap and tighten using a hammer CAUTION Always make sure 4 cap is tight on tank and vent valve 15 closed before starting compressor Leaders in the Field of Drilling Technology 13 of 27 Equipment Inspection Prior to Compressor Ignition CAUTION The following walk around check should be carried out prior to starting the compressor Step Specific Equipment Required State Complaint Hose connecting Drill to Support Station RED Air flow arrow goes to Drill Hose connected to outlet valve Hose connecting compressor to Support Station Connected at electric inlet valve Inlet and Outlet Valve Connections Wing nuts tightened using hammer turning clockwise Inlet and outlet valves on Support Station Whip Connected correctly as described in above Checks sections Hose to compressor connection Wing nuts tightened using hammer turning clockwise Hose to compressor connection Whip Check Connected correctly as described in above sections Hose to Drill connection Wing nuts tightened using hammer turning clockwise Hose to Drill connection Whip Check Connected correctly as described in above sections 4 Wing Nut on top of Rock Drill Oil Tank Tightened using hammer turning clockwise 10 Rock Drill Oil Tank Vent Valve Close valve in the 12 o clock or vertical position 1 Main Air Discharge valve 2 Valve to Drill Open Parallel to Valve Body 112 Power Co
16. nnections for Tri Lite Controller Connected to 12V Battery Black to NEGATIVE and Red to POSITIVE Tri Lite Controller Valve Operating correctly Red light means air off Valve Operation closed Green light air on Valve Open Tri Lite Controller Valve Red light air off Valve closed prior to starting compressor Leaders in the Field of Drilling Technology Page 14 of 27 VA gt j i gt Pir gt i um m E N h 2 Pressure Regulator Adjustment On a new support station system the pressure regulator needs to be set at 75 PSI To adjust the pressure after the walk around inspection and the compressor 1 operational turn the Air Discharge Valve Valve to Drill off Turn electric valve on Green light on this will pressurize the system Adjust the regulator clockwise to turn pressure up and counter clockwise to reduce pressure Set pressure gauge to 75 PSI After adjustment turn electric valve off red light and turn Air Discharge Leaders in the Field of Drilling Technology 15 of 27 DIRECTIONAL DRILLING HDDP 7 2 A i od gt Oiler Adjustment The amount of oil dispersed is dependent on where the needle valve is set The Oiler valve is located on the front control panel Turning the valve counter clockwise provides more oil and clockwise reduces oil flow A good starting point is
17. ns per minute will VALVE suffice however in softer rock conditions more water may be required and significantly 09 05 2011 12 44 pm harder rock conditions will require less Once the optimal water injection 1 set the water will turn off when the operator turn off the main air supply to the drill and conversely will turn back on when the main air supply is re pressurized It is best to adjust the water while drilling as conditions can change throughout the entire bore hole Leaders in the Field of Drilling Technology Page 17 of 27 Caution Never turn the water pump on with the main discharge valve 2 Ball Valve to drill on the support station closed The water should always have a path out through the drill string Always use clean water Bentonite should not be used as it will clog the hammer requiring a complete overhaul to return the hammer to an operable condition A good mixture of polymer and Con Det is acceptable if drilling in clay Check the in line filter on the pump periodically for debris In colder conditions antifreeze the pump and drain the water hose and clean and empty the inline filter to protect from freezing while not operating the drill 2 2 4 Commissioning of Hammer Coat the drill bit shank and the hammer threads with grease for protection and easier dismantling Prior to use lubricate the hammer with 2 pint litre of rock drill oil as described above Fit the hammer to the drilling ri
18. of 27 3 j i e 8 Ti EMI El R gt 2 Installation and Operation 2 1 Safety Be sure to work safely at all times Wear protective clothing and safety equipment and observe all safety regulations as prescribed by your employer Government or the site on which you work Do not wear loose clothing that may get caught in rotating parts and cause serious personal injury Remember that a Horizontal Down the Hole percussive hammer emits noise and you should therefore take every precaution to safeguard your hearing against damage by using proper ear protectors Use eye protection at all times Rock chips and dust which may be discharged from the face of the bit or bore hole at high velocities and can cause severe injury Hammers can be heavy Always use proper and approved lifting equipment and take every precaution to safeguard yourself against injury Keep hands clear at all times Beware of getting fingers trapped between the chuck and bit and do not use hands or feet to clear the top of the borehole at any time Other safety advice is given throughout this document which you are advised to read 2 3 Set up of HDD50 Hammer and Sonde 2 2 1 Storage If you intend to store the HDD50 Hammer we recommend that l2 pint litre of good quality rock drill oil be poured into the hammer to protect it To do this the hammer section should be unscrewed from the Bent Sub and then the o
19. reads When the hammer is lifted from the rock face the drill bit extends from the chuck and the percussive action ceases Extra air will pass through the hammer which can be used to flush the hole clean Rotation speeds should not be too high and should be selected to suit drilling conditions and drill bit diameters High rotation speeds do not provide fast drilling and can cause premature wear of drill bits hammers and tubes Too slow a rotation speed can cause binding in the borehole and damage to drill bit inserts The controls of the drill should be adjusted in order to provide the largest drill chip size with the smoothest rotation and feed characteristics Recommended rotation speeds would normally vary between 25 35 R P M for most applications Where big diameter drill bits are used or when drilling in hard abrasive rocks slower rotation speeds are recommended Conversely in soft non abrasive rock a slightly faster rotation speed may be selected to produce more satisfactory results Some ground conditions may cause binding within the hole with the added risk of the hammer and drill string becoming jammed Any excessive pullback forces or high rotation speeds used in an attempt to recover the drill string may generate heat zones around the hammer which may alter the metallurgy of the components to cause damage and ultimate failure You are strongly advised not to pour diesel into the hammer as this may create an internal combus
20. rock and delivered to the initial user to be free of defects in materials or workmanship for a period of 3 months after initial operation or 6 months from the date of shipment to the initial user whichever occurs first Hardrock may elect to repair the defective part or issue full or partial credit towards the purchase of a new part The extent of credit issued will be determined on a pro rata basis bearing in mind the service life of the defective part against the normal service life of that part The part will be replaced or repaired without charge to the initial user at the place of business of an authorized Hardrock distributor during normal working hours The user must present proof of purchase at the time of exercising the warranty The warranty applies only to failures resulting from defects in the material or workmanship and does not apply to failures occurring as a result of abuse misuse corrosion erosion negligent repairs and normal wear and tear Failure to follow recommended operating and maintenance procedures which result in component failure will not be considered for warranty This warranty is in lieu of all other warranties other than title expressed or implied Limitation of Liability Hardrock will not accept any remedies to the user other than those set out under the provisions of warranty above The total liability of Hardrock or its distributors with respect to the sale of DTH Hammers or spare parts therefore whether based on
21. the Sonde Housing Backhead in leaders In WESTEN et Drilling Page 7 of 27 2 2 2 2 Installation of Sub Sight Sonde The procedure for installing a Sub Sight Sonde is the same as the DCI Sonde except Step 3 through Step 7 are replaced with the following Above picture shows the end of the All screws to be inserted Fit the first half of the Sub Sight Sub Sight Sonde that will receive should have the threads coated adaptor to the Sonde and tighten the Sub Sight Locating adaptor with a thread lock compound Fit the second half of the Sub Sight Fit the top section of the Sub Unscrew the other end off the adaptor to the Sonde and tighten Sight locating assembly and Subsight and replace with the Then fit the assembly locking tighten Adaptor end cap shown above Once screw as shown above completed the Sonde assembly can be installed from Step 8 above Leaders in the Field of Drilling Technology Page 8 of 27 A DRILLING HDDP La ee i ee eT HARDRCCN S 2 2 3 Installation of Bit The following sequence of instructions is used to correctly fit the bit in the correct orientation for drilling Remove Bit Retaining Ring from the Chuck and screw the Chuck back in place Aligh these cerbide Wear CAubbides Insert the bit into the Chuck so that the Bent Sub wear carbides are aligned in a straight line with the three bit wear carbides as illustrated above S LITT In
22. tive effect and will damage the hammer and its components Any heat induced failures are not covered by our terms of warranty Before adding a drill rod make sure that the threads are clean and well greased and that there are no contaminants likely to enter the hammer to cause damage and early wear Proper drill guides and break out systems must be used which suit the diameter of the hammer tools and spanners used for the drill bit and break out flats must fit properly Leaders in Field of Drilling Technology Page 20 of 27 iA a aa DRILLING HDDP Make certain that the hammer is stationary when applying spanner or breakout tools Do not rotate the hammer with a spanner attached to the drill string unless it 1s safely captivated within the breakout clamp 2 3 Servicing 2 3 1 General Dismantling the Hammer for servicing or to change the bit can be made easier if the chuck threads are regularly greased and the backhead threads are well greased any time the hammer is opened for servicing We recommend that a good quality thread grease be used and in acidic conditions we do not recommend copper based greases as this can trigger a galvanic reaction with corrosive effect to damage the root of the threads and cause failure 2 3 2 Opening Chuck and Backhead The threads used in Hardrock Hammers are right hand threads Proper tools and break out systems should be used at all times to dismantle DTH hammers otherwise dam
23. uen Of Drilling Ms SN _ 9 27 DIREC TIONAL DRILLING HDDP v coc Cb cy lt I TEE li dm le Unscrew the Chuck and Bit from the hammer Insert the Bit Retaining Rings back into the Chuck making sure that the bit does not come out of the as shown above making sure that the Bit does not Chuck come out of the Chuck Push the Chuck forward to secure the Bit Retaining Ring in place against the rear splines Screw the Chuck Bit and Bit Retaining Rings in place In FUTURE of Drilling Page 10 of 27 Setup and Operation of Support Station Prior to operation the Support Station must be setup to ensure that correct and safe operation of the equipment is carried out CAUTION For safe working conditions during operation of the equipment it is essential to have received the appropriate training prior to starting up the equipment Set up of Support Station Step 1 Unpack Support Station and check to make sure all components are present P D a Nio HARDR CK Mr d 2 Boss fittings are also included to adapt Support Station to most satisfactory air supplies Caution Rear handle is not to be used as a lifting device during unpacking or field operations iis w C Leaders in the Field of Drilling Technology 11 of 27 Support Station comes delivered with whip checks in place on both the air intake
24. wear sleeve and come out It can then be pulled out by hand 2 3 5 Inspection Prior to inspection thoroughly clean all parts using a suitable cleaning agent Diesel is not recommended for cleaning as it can cause erosion to components and damage to health parts should be visually inspected for any signs of damage wear or cracking The inner cylinder wear sleeve and lock rings can be checked for unseen cracking by suspending them and lightly tapping with a screw driver If they emit a ringing tone then they should be sound However a dull flat tone if emitted may indicate cracking and the part should be replaced Take particular care to check the internal bore of the wearsleeve for pick up marks and galling If these are present the barrel of the wear sleeve should be honed out using a hand hone to remove them Inspect surface of the piston for pick up marks and galling usually caused through poor lubrication or the presence of contaminants and smooth out with emery paper or a hand held grit stone Where galling of the piston has occurred substantial heat has been generated and quite often micro cracking has occurred on the piston In these cases the piston should be replaced if there 15 evidence of such cracking Check the strike face of the piston for cracking or damage Leaders in Field of Drilling Technology Page 22 of 27 aae Ie 4 HDDP 2 3 6 Checking Wear Limits The performance of the hammer
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