Mincon MR120
Contents
1. Operation and Service Manual Copyright Mincon 2012 All Rights Reserved Leaders in the Field of Drilling Technology Table of Contents 1 2 3 4 5 INTRODUCTION INSTALLATION AND 3 22 HAMMER 3 O ces vadeedestervoceuestnseteeees 3 220 3 397 ________ ______ 4 Ce HOTA 4 23 SERVICING 5 5 252 Opening CN UCk and Backhead E 5 2 3 3 Dismantling Hammer Change Drill 5 2 3 4 Disassembly for Full Servicing Of 5 ZS MOCO __ A 6 230 Wear ee ee A eee 6 __________ __ 6 TROUBLE SHOOTING 8 APPENDIX 9 41 REVERSE CIRCULATION HAMMER EXPLODED VIEW AND PARTS LIST AND TECHNICAL 9 Az HANMER SERVICE LOG croisson E E E 10 WARRANTY ccoir E 11 Leaders in the Field of Drilling Technology ra 1 Introduction Thank you for c2. If it is evident that the hammer or its components have achieved a reasonable proportion of their anticipated life
3. Check lubricator and ensure oil film on the bit splines through large cracks leading to breakage diameter Feeding hard through voids on Use light feed and ensure the hole is kept clean and broken ground can cause consolidated Use foam or mud if necessary Bogged Drill can lead to reaming If such danger is imminent use a dig out sub wearsleeve to distort causing heat cracks and galling on the piston Using wrench over wrong area to Use wrench only in the open drill can cause the wear Area indicated sleeve to distort Increase feed until rotation binds and pressure pulses and then breaking back off until the rotation and pressure becomes smooth Over running sample tubes will Replace sample tubes before they are worn out allow ingress between the two striking faces and cause piston nose to crack 1 4 Appendix Drilling nnology 4 1 Reverse Circulation Hammer exploded view and Parts List and Technical Data 1 DOD O 19 Item Description Part Number 2 27 MR120 RC Hammer 4 Remet MR120AS01 Mincon MR120 RC Hammer 4 Metzke MR120AS02 H 21 MR120 RC Hammer 4 Remet MR120AS03 MR120 RC Hammer 4 Metzke MR120AS04 4 1 Internal Circlip D1300 0780 5 E gt 2 O Ring 4 Remet Only BS 226 6 amp 22 O Ring 4 Remet Only BS 228 6 3 Adaptor Tube 4 Remet MX5053AT01 Adaptor Tube 4 Metzke MX5053AT 11 T Ada
4. and that all threads are cleaned greased and all rings are in good condition before coupling together e Turn on air and blow until oil starts to run out of the bit shank e Cycle the hammer on half air for the first few minutes to run in internal parts 2 2 3 Lubrication It is vital for DTH hammers to receive a constant supply of proper rock drill oil in to the air stream to lubricate and protect the internal components and to provide a good air seal between the piston and its matching component parts for efficient drilling It is recommended that an automatic oiling system be used when operating your hammer Too much oil can cause hydraulic locking in the hammer Drilling with insufficient lubrication will cause the hammer to run dry and cause premature wear or failure The correct consumption of oil oil type is dependent upon the air volume and ambient conditions Please refer to the lubrication graph below for recommendations There should be visual evidence of oil around the drill bit shank and within the tube joints when changing tubes 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 150320 grade rock drill oil should be used whenever possible as the hammer is a high frequency tool however where the pump cannot pump the oil in colder conditions a lower viscosity of oil can be used as per the graph below Remember Insufficient
5. lubrication or incorrect lubrication grades may result in damage being caused to the hammer and its components Hydraulic oils engine oils gear oils and diesel are not recommended for lubricating DTH hammers Litres Hour Pressure Bar 6 9 13 8 20 7 27 6 34 5 120 48 9 100 37 8 2 Air Volume CFM Ambient Temperature F L JusIQquiy US Pints Hour Pressure PSI At low temperatures of 5 C 41 F and in hot humid conditions with higher air pressures when hammers can freeze up Anti freeze additive may be required at a rate of 1 2 litres 2 4 pints per hour or more as necessary 2 2 4 Operation Be sure to familiarise yourself with the controls of the rig and work in accordance with the rig manufacturers recommendations The hammer 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 the piston cycle 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 drill rods 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
6. 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 2 Hammer Care 2 2 1 Storage It is important to take the following steps in order to ensure smooth operation when hammer is to be re used When the hole is completed and the hammer is to be inactive for some time the following steps should be taken Short Term Storage e g 1 2 weeks e Using high pressure air blow the hammer clear of all water Turn automatic oiler up full and cycle hammer until oil is running out the shank of the drill bit If there is not an automatic oiler pour 1 litre 2 pints of rock drill oil in to the back head Top sub Turn the air on and cycle for 10 seconds This will lubricate the internal parts Seal the hammer at the back head Top sub and chuck end with a rag to exclude any dust or foreign particles Store the hammer horizontally in a clean dry environment Long Term storage e g 1 month or longer Using high pressure air blow the hammer clear of all water Break out the back head and chuck on the rig as it is easier to d
7. d of 12 15 per second 300 Rotation speed too slow 380mm Place chalk mark on drill rod and check the advance revolution If greater than 12 12mm per revolution increase rotation until the advance per revolution 15 maximum of between 3 8 12 10 12mm Low penetration Worn drill clearances Inspect piston inner cylinder wearsleeve and bearing against Low pressure discard measurements and discard as necessar Lack of oil Ensure there is an oil film coming from bit spline and bit parts Place cardboard under bit to check Sudden loss of Over run blown out sample tube Check sample tube wear regularly and change before it is worn pressure out PART FAILURE Problem Possible cause Remedy Cracked wear Abuse of wearsleeve Avoid welding heating or torque wrenching in the wrong place sleeve external as outlined in section 1 4 Note also section 1 6 part distortion Worn wearsleeve Outside diameter has worn beyond the discard point Measure casing O D approx 75mm 3 from chuck end and backhead end and replace if necessary Corrosion If drilling in a corrosive environment wash internal and external parts regularly to avoid corrosive impact on the drill overheating distortion of the rill Drill bogged can lead to chuck Inspect all parts thoroughly if drill is recovered and replace wear sleeve and chuck sleeve to parts where necessary distort Piston cracked Lack of lubrication causes micro
8. er Service Log New Dimension As Measured Actual Clearance Discard Clearance Piston OD efko nosom 0 25 2 Chuck PASSASSE SASS SS PA AS RS SSSA YS New Dimension As Measured Actual Clearance Discard Clearance Piston OD 8 5765 947mm 0 25 New Dimension As Measured Actual Clearance Discard Clearance Fon 05 6 8208 5 feoj Mincon Rockdrills Driller s Choice Page 10 5 Warranty Mincon DTH HAMMERS Warranty October 2002 Mincon warrants that the Hammers and spare parts therefore manufactured by Mincon 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 Mincon 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 Mincon distributor during normal working hours The user must present proof of purchase at the time of exercising the warranty The warranty applies only to
9. etaining ring However if required please do as follows e Insert along flat head screw driver the groove in the piston retaining ring and lever the ring clear from the wear sleeve groove Using a hook pull the ring out of the wear sleeve e The back head is disassembled as so remove the circlip from its groove and lift the adaptor tube out with the screen assembled around it 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 corrosion to components and damage to health All 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 It is usual that if there are signs of damage or heat checking on one part that there is also the same on mating parts 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 g
10. 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 15 in lieu of all other warranties other than title expressed or implied Limitation of Liability Mincon will not accept any remedies to the user other than those set out under the provisions of warranty above The total liability of Mincon or its distributors with respect the sale of Hammers or spare parts therefor whether based on contract negligence warranty indemnity or otherwise shall not exceed the purchase price of the product upon which such liability is based Mincon 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 Mincon 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
11. hoosing the Mincon MR120 Down the Hole hammer Please read this manual carefully before using your hammer in the interests of safety warranty and best operational care The Mincon MR120 is manufactured with specially selected materials and heat treatment to withstand the stresses of drilling in the most extreme conditions Internal components are manufactured to meet finely matching tolerances to provide fast drilling reliability and efficient use of air without waste With correct care your Mincon MR120 hammer should provide you with top performance reliability and long service life Warranty is provided by Mincon as per the warranty section 5 Please keep this instruction manual as a permanent record for your Reverse Circulation Hammer 8 The specifications and instructions contained in this manual are based on the up to date information as at publication date 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 Reverse Circulation 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
12. nd prevent heat damage It is recommended that you do not pour diesel into the hammer if it becomes bogged However if this is done there is the risk an internal combustive effect if the hammer is fired while there is diesel in it This will damage the hammer and its components Any heat induced failures are not covered by our terms of warranty Before adding drill rods make sure that the threads are clean well greased and all O rings are in good condition Ensure that there are no contaminants likely to enter the hammer to cause damage and early wear It is recommended that proper drill guides and break out systems be used which suit the diameter of the hammer All tools and spanners used for the drill bit and break out flats should fit properly 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 is safely captivated within the breakout clamp All internal hammer O rings check valve and check valve seal should be examined and replaced periodically to ensure optimum performance and effective sealing from borehole ingress 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 condition
13. o it here than back in the workshop Disassemble the hammer Inspect and clean all hammer components Lubricate all the internal components with rock drill oil Reassemble the hammer and seal the back head and chuck end Store horizontally in clean and dry environment Before restarting any hammer after prolonged periods of inactivity disassemble and inspect all internal parts Clean and remove any oxidation with an emery cloth Re lubricate all internal components with rock drill oil and reassemble the hammer Full assembly and disassembly instructions can be found further on in this manual 2 2 2 Commissioning Always use drill bits in good condition sharpened Using overrun bits can affect the life of the bit chuck chuck sleeve and reduce penetration rates which can damage internal components due to the non transference of energy in to the rock being drilled Leaders in tne Field 1 Technology ra When starting a hammer for the first time or a hammer that has been stored for a prolonged period please follow the following instructions e Grease the threads on the back head and chuck and fit to the hammer complete with drill bit e With the bit in the breakout pot torque up the hammer until the standoff between the backhead and wear sleeve has closed up e Before adding the first drill rod pour 1 litre 2 pints of rock drill oil in to the back head e Ensure all drill rods are blown clean of any dirt and debris
14. ptor Tube 4 Remet 505 21 Adaptor 4 gt MX5053AT31 4 O Ring BS 224 6 Air Screen MX5053SC01 9 7 Backhead 4 Remet MR120BH01 Backhead 4 Metzke MR120BH11 10 23 Backhead 4 Remet MR120BH21 Backhead 4 12 Metzke MR120BH31 11 8 ORing BS 241 9 Check Valve Seal Nitrile U Seal 8406 175 12 10 Check Valve MX5053CV01 13 11 Check Valve Spring MX5053SP01 24 12 MX4550SS01 13 Lock Ring MX4550LR01 l 25 14 Sample Tube MR120ST03 15 ORing BS 228 S 26 16 Sample Tube Mount MR120DR01 14 17 ORing BS 226 CO a 18 O Ring BS 234 28 19 ORing BS 040 29 20 Seating Ring MX5053SR01 21 Inner Cylinder MR120IC01 30 22 Piston MR120PNO1 23 Sleeve MR120WS01 15 A 31 24 Retaining Ring MX5053PR01 am 25 Aligner MR120BB01 16 26 ORing 7 92x4 27 Ring BS 237 28 Retaining Ring MR120BR01 18 S 5 29 ORing BS 152 30 Chuck MR120CK01 31 Chuck Sleeve MR120CS139 Specifications Metric Imperial Hammer Outside Diameter 120mm 4 75 Hammer Length Less Drill Bit 1165mm 45 9 Backhead Spanner Flat Size 94mm 3 7 Drill Bit Shank Type MR120 Drill Bit Size Range 127mm 143mm 5 5 625 Hammer Weight Less Bit 70 Kgs 154 Lbs Maximum Drill Bit Weight 14 5 Kgs 32 Lbs Piston Weight 14 5 Kgs 32 Lbs Backhead Stand Off 0 75mm 0 030 Recommended Minimum Air Package 25 5 m min 24 1Bar 900 cfm 350 psi 4 2 Hamm
15. re possible carry out disassembly in a clean work shop environment e Break out the back head and chuck as described previously e Mark the ends of the wear sleeve as chuck and back head end Leaders in tne Field of Technoltoavy e Secure the hammer a chain vice to hold steady e Remove the check valve and spring from the top of the Sample tube e At the chuck end of the hammer push the sample tube end in to the hammer with a piece of wood Be careful as this end can be very sharp from wear e From the opposite end pull the sample tube out of the hammer e Remove the sample tube spacer from the sample tube and then remove the Lock ring from inside the hammer on top of the Sample tube mount e From the chuck end insert a soft steel drift in to the hammer against the piston strike face e Carefully Knock the piston out the back head end of the hammer This will push the Inner cylinder sample tube mount assembly out of the hammer as well Do not use the sample tube for this process as it would damage it Toremove the Aligner bearing bush reverse the direction of the piston the strike face towards the back head and with the soft steel drift against the piston strike face carefully knock the Aligner out the chuck end of the hammer e Push the piston out of the back head end of the hammer e As the wear sleeve for MR series RC hammers are not reversible it is not necessary to remove the piston r
16. rit 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 is evidence of such cracking Check the strike face of the piston for cracking or damage Inspect the Aligner for any galling or cracks If either is present then the aligner should be replaced All internal hammer O rings check valve and check valve seal should be examined and replaced periodically to ensure optimum performance and effective sealing from borehole ingress If there has been any sanding or polishing of parts then it is critical that these parts are thoroughly cleaned before re assembly 2 3 6 Checking Wear Limits The performance of the hammer is dependent on the designed running clearances of critical components These should be measured and recorded in the Service log the appendix The service log gives the location of where measurements should be made Depending on how many parts need to be replaced to bring the hammer back to optimum performance 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 except for the sample tube are liberally coated with good quality rock drill oil and threads with thread grease Replace all O rings and check valve seal before re as
17. s 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 To open Mincon DTH hammers please adhere to the following instructions e The threads used in Mincon Hammers are right hand threads Therefore they loosen in an anti clockwise direction Please use bit breakout pot to hold the drill bit when opening the chuck Please ensure that the wrench is not placed on the threaded section or the piston running area of the Wear Sleeve Break out wrench jaws should be 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 and distort accurate running diameters e Hitting the hammer may also cause hard metal fragments to be chipped off which may be projected and cause personal injury or eyesight loss e Do not apply heat to the hammer as this can alter the metallurgical composition and result in premature failure e 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 changing the drill bit please follow this procedure e Please follow the opening instructions from section 2 3 2 e Remove the bit retaining rings form around the top of the bit shank e Lift the chuck
18. sembly e Identify the chuck end of the hammer and stand with the chuck end facing up Insert the piston retaining ring in to the groove provided Ensure the extraction groove on the retaining ring is facing the chuck end of the hammer e Insert the Aligner with the smaller outside diameter facing the piston retaining ring in to the wear sleeve Using a soft steel drift tap the aligner in to place against the piston retaining ring Place the bit retaining rings on top of the aligner Screw the chuck with the chuck sleeve assembled on it in to the wear sleeve Seal up the chuck end of the hammer Turn the hammer over so the back head end is facing up Insert the Piston in to the wear sleeve refer to the exploded view for orientation Insert the Sample tube mount in to the inner cylinder and fit the seating rings around the round holes on the inner cylinder Leaders tn tne Field of Drilling Technology ra Insert the Inner cylinder assembly in to the wear sleeve Tap the assembly in to place using a soft steel drift Place the lock ring on top of the sample tube mount Fit the spacer on to the sample tube with the flat face facing down to the drill bit end of the sample tube Place the check valve spring on to the locating recess on the spacer and fit the check valve in to place Spray the area under the rings of the sample tube with penetrating oil e g CRC WD40 If hammer oil is used then the sample tube will not go in to place properl
19. sleeve over the threads of the chuck e Remove the chuck from the shank of the bit e Inspect the splines and threads of the chuck for damage excessive wear or galling e Inspect the sample tube end wear Be careful checking sample tube wear as the end can be extremely sharp Always change the sample tube before it is worn out e Inspect the face of the piston for any pitting or cracking on the strike face If there is any damage then it should be replaced Please do not inspect the piston while it is suspended on the drill rig Always do this with the hammer in a horizontal position If the piston nose is damaged is likely that the Aligner Bearing bush is damaged as well e Inspect the Aligner Bearing bush for any damage If there is any damage then it should be replaced e Grease the threads on the chuck and place the chuck down over the splines of the bit e Place the Chuck sleeve on to the chuck e Ensure that the gauge diameter of the drill bit and the diameter of the chuck sleeve have the running clearance you require for effective sampling e Place the bit retaining rings over the top of the bit shank e Screw the chuck bit assembly in by hand to ensure that the sample tube does not get jammed up in the bit when fully shouldered up e Torque up the hammer with the bit in a bit break out pot to ensure it does not run loose 2 3 4 Disassembly for Full Servicing of Hammer For full disassembly please follow these instructions e Whe
20. the hammer components and threads When the hammer is lifted from the rock face the drill bit extends from the chuck and the percussive action ceases The air will pass through the hammer which can be used to flush the hole clean Rotation speeds should be selected to suit drilling conditions and drill bit diameters High rotation speeds can cause premature wear of drill bits hammers and drill rods Too slow a rotation speed can cause binding the borehole and damage to drill bit inserts through the snatching rotation action In hard and soft formations of rock the aim of the hammer is to penetrate smoothly at the rate of 10mm 0 375 per drill rod revolution Generally in softer geology higher rotational soeeds can give better results The controls of the drill should be adjusted in order to provide the largest drill chip size with the smoothest rotation and feed characteristics Rotation speeds should be set to suit the rock conditions being drilled Leaders tn the Field of Drilling Technology Some ground conditions may cause binding within the hole with the added risk of the hammer drill bit 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 affect the metallurgy of the components to cause damage and ultimate premature failure A backreamer sub may help reduce jamming in bad ground conditions a
21. y because a hydraulic lock will occur between the sample tube shoulder and the sample tube mount Insert the sample tube assembly in to the hammer Pour hammer oil in to the hammer Fit the screen to the adaptor tube and insert the assembly in to the back head Insert the circlip in to the back head to lock the assembly in to place Screw the back head assembly in to the wear sleeve There should be a standoff gap of between 0 5mm 1mm 0 020 0 040 between the back head and wear sleeve shoulders If the shoulders meet up then the lock ring needs to be replaced so that all internal parts are properly locked in place Seal up the top of the hammer Store the hammer on its side and rotate it periodically if it is being stored for an extended period of time If a hammer is to be stored for a long period of time we would recommend that the hammer be disassembled oiled up and stored in a clean dry environment Leaders tne Fietd of Drilling Tecnnology ik 3 Trouble Shooting Problem Low penetration External drill clearances are worn Change or re sharpen the drill bit Make sure that the running and high pressure clearance on the bit seal is what you need for the drilling conditions Open hammer and clean the obstruction Rough or erratic Too much feed pressure Set the feed pressure until the rotation starts to bind Then back operation off the feed pressure until the rotation runs smooth Drill bit peripheral rotation spee
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