Mincon HDD 50 Directional Drilling Hammer Operation and Service Manual
The HDD 50 is a directional drilling hammer designed for use with horizontal directional drilling machines. It's capable of drilling through various rock formations and features a robust design for durability and efficiency. The manual provides comprehensive instructions on setting up, operating, and servicing the hammer.
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Operation and Service Manual
Copyright © Mincon 2010, All Rights Reserved.
T
ABLE OF
C
ONTENTS
Mincon – “Leaders in Rock Drilling Technology” Page 2
1 Introduction
This document covers the HDD50 Horizontal Directional Drilling System. The system connected to the drill using the following:
•
HDD50 Horizontal Directional Hammer
•
Support Station
•
Compressor
•
Water supply
The basic setup is shown below.
Horizontal Directional Drill
Including but not limited to:
Astec 3238, DD4045, DD 4
Ditch Witch 2720 M1, JT3020, JT4020 M1
Vermeer 24X40, 36X50, 50X100
Compressor
Minimum 275 PSI
Support Station
Rock Drill Oil Injection
Water injection
Compressor to Drill adapter
Water Tank
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 HDD50 in the service section we will separate it into two parts: Firstly the Horizontal
Directional Drilling hammer component that makes drilling possible and secondly the Sonde housing component that makes steering possible.
Mincon – “Leaders in Rock Drilling Technology” Page 3
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.
2.2 Set up of HDD50 Hammer and Sonde
2.2.1 Storage
If you intend to store the HDD50 Hammer we recommend that ½ pint (¼ 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 oil 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.
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
Unscrew and remove Sonde Housing Backhead from the
Sonde Housing Sleeve
STEP 2
Insert and screw the Sonde Line Up Tool into the Sonde
Carriage retrieval cap and pull out the complete Sonde
Carriage assembly.
Mincon – “Leaders in Rock Drilling Technology” Page 4
Step 3
Unscrew and remove the Sonde Carriage Locating Cap,
Springs and the DCI Adapter from the Sonde Carriage (At
Opposite end to the Sonde Carriage retrieval cap)
Step 4
Loosen and remove with the Torque Wrench the DCI Adaptor
Locating cap from the tube. The correct end has locating dimple.
Step 5
Insert and push the DCI Sonde into the tube.
Mincon – “Leaders in Rock Drilling Technology”
Step 6
Fit the DCI Adaptor Locating cap onto the DCI Sonde ensuring the Locating cap’s intrical key is seated correctly in the Sonde Keyway.
Page 5
Step 7
Push the Sonde in the rest of the way and screw the DCI Adaptor Locating
Cap in and tighten snugly with the
Torque wrench.
Step 8
Insert first spring into the
Sonde Carriage.
Step 9
Insert the DCI Adaptor into the Sonde Carriage
Step 10
Insert the second spring in to the Sonde Carriage.
Sonde Carriage
Locating Cap
Groove
DCI Adaptor
Locating
Dimple
Step 11 Step 12
Align the Sonde Carriage Locating Cap
Groove with the DCI Adaptor Locking Dimple and push the cap on so that the hex socket of the Carriage Locating Cap fits over the
DCI Adaptor and then screw the Carriage
Locking Cap in place
Push the Sonde carriage into the Sonde
Housing Sleeve with the Sonde Carriage
Locating cap entering first.
Step 13
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).
Mincon – “Leaders in Rock Drilling Technology” Page 6
Sonde Carriage
Locating Pin
Step 14 Step 15
Above picture shows the Sonde Carriage Locating Pin. The pin is in the
Bent Sub set so that the Sonde will be aligned correctly in the twelve
O’clock position.
Insert and screw the Sonde Housing Backhead in place.
Mincon – “Leaders in Rock Drilling Technology” Page 7
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:
Step 1 Step 2 Step 3
Above picture shows the end of the Sub
Sight Sonde that will receive the Sub Sight
Locating adaptor.
All screws to be inserted should have the threads coated with a thread lock compound.
Fit the first half of the Sub Sight adaptor to the Sonde and tighten.
Step 4 Step 5
Fit the second half of the Sub Sight adaptor to the Sonde and tighten. Then fit the assembly locking screw as shown above.
Fit the top section of the Sub Sight locating assembly and tighten.
Step 6
Unscrew the other end off the Subsight and replace with the Adaptor end cap shown above. Once completed the Sonde assembly can be installed from Step 8 above.
Mincon – “Leaders in Rock Drilling Technology” Page 8
2.2.3 Installation of Bit
The following sequence of instructions is used to correctly fit the bit in the correct orientation for drilling.
Step 1
Unscrew and remove the Chuck from the Hammer.
Step 2
Remove Bit Retaining Ring from the Chuck and screw the
Chuck back in place.
Step 3
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.
Mincon – “Leaders in Rock Drilling Technology” Page 9
Step 4 Step 5
Unscrew the Chuck and Bit from the hammer making sure that the bit does not come out of the Chuck.
Insert the Bit Retaining Rings back into the Chuck as shown above making sure that the Bit does not come out of the
Chuck.
Step 6
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.
2.3 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.
Mincon – “Leaders in Rock Drilling Technology” Page 10
2.3.1 Set up of Support Station
Support Station
30’ Air Hose
20’ Air Hose
TRI-Lite
Valve
Controller
Water Hose
Whip Checks
Step 1
Unpack Support Station and check to make sure all components are present.
2” NPT Couplings
Step 2 Step 3 Step 4
Support Station comes delivered with whip checks in place on both the air intake 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.
Connect air hose to Support Station air intake valve.
When completed pull whip checks back so that they are as shown above. Above picture shows air discharge side of support station.
Mincon – “Leaders in Rock Drilling Technology” Page 11
Step 5 Step 6
Connect air hose to the compressor in the same manner. Connect other air hose to
Support Station discharge line and to Drill also using the same procedure.
Hook TRI light controller connections to electric valve
Step 7
Before Operation, check level of oil in the water pump fill cap with dip stick.
Step 8
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) lower right hand control knob, 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 middle 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 is closed before starting compressor.
Mincon – “Leaders in Rock Drilling Technology” Page 12
2.3.2 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
( )
1 Hose connecting Drill to Support Station
RED Air flow arrow goes to Drill. Hose connected to outlet valve.
2 Hose connecting compressor to Support Station Connected at electric inlet valve.
3
4
5
6
7
8
Inlet and Outlet Valve Connections
Inlet and outlet valves on Support Station Whip
Checks
Hose to compressor connection
Hose to compressor connection Whip Check
Hose to Drill connection
Hose to Drill connection Whip Check
Wing nuts tightened using hammer turning clockwise.
Connected correctly as described in above sections.
Wing nuts tightened using hammer turning clockwise.
Connected correctly as described in above sections.
Wing nuts tightened using hammer turning clockwise.
Connected correctly as described in above sections.
9 4” Wing Nut on top of Rock Drill Oil Tank
10
11
12
13
14
Rock Drill Oil Tank Vent Valve
Main Air Discharge valve (2” Valve to Drill)
Power Connections for Tri-Lite Controller
Tri-Lite Controller Valve Operation
Tri-Lite Controller Valve
Tightened using hammer turning clockwise.
Closed (knob pointing to up as in Photo)
Open (Parallel to Valve Body)
Connected to 12V Battery – Black to NEGATIVE
(-) and Red to POSITIVE (+)
Operating correctly – Red light means air off
(Valve closed) Green light air on (Valve Open)
Red light – air off (Valve closed) prior to starting compressor
Mincon – “Leaders in Rock Drilling Technology” Page 13
2.3.3 Pressure Regulator Adjustment
On a new support station, the pressure regulator needs to be set at
80 PSI. To adjust the pressure after the walk around inspection and the compressor is operational, turn the Air Discharge Valve (Valve to
Drill - 2” ball valve) off, Turn electric valve on (green light on) this will pressurize the system.
Adjust the regulator clockwise to turn air pressure up and counter clockwise to turn pressure down. Set pressure gauge to 80 PSI.
After adjustment turn electric valve off (red light) and turn Air
Discharge Valve on, handle parallel to the valve body.
CAUTION; Operating at higher pressures may cause motor to develop an air lock and stop operating.
2.3.4 Oiler Adjustment
The amount of oil is dependent on where the needle valve is set. The needle valve is located on the far left as shown here. Turning the valve counter clockwise provides more oil and clockwise gives less oil. A good starting point is to close the valve fully and then turn one and a half revolutions to the counter clockwise. The two valves located on the control panel (see photo) are how you turn the oiler on and off. During drilling the two valves should be ON. When not drilling turn valves OFF.
CAUTION : At the end of the day turn the valves off or you will be wasting oil. The oiler will continue to oil whether compressor is on or off. It is recommended that on a new system, until the operator is familiar with the system that after each rod is drilled down ¼ cup or two ounces of rock drill oil be poured in each rod, especially if a new hammer is being commissioned.
2.3.5 Water Pump Adjustment and Operation
Always prime water hose before hooking the cam lock to the pump. It is essential to have the water tank above the support station to maintain sufficient head pressure for the pump to operate.
The amount of water being introduced into the drilling operation is controlled by turning the knob labelled water on front panel to desired amount of flow. The amount of water required to maintain a clean hole will be dependent on the drilling conditions. Approximately 3-4 gallons per minute will suffice however in softer rock conditions more water may be required and significantly harder conditions will require less. Once the optimal water injection is set the water will turn off when the operator turns off the main air supply to the drill and conversely turn on when the main air supply is turned on. It is best to adjust the water while drilling as conditions can change throughout the bore hole.
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 and through the drill string. Always use clean water. Bentonite should not be used as this will clog up the hammer requiring a complete overhaul to return the hammer to an operable condition. A good mixture of polymer and Condet 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 40 foot water hose and clean and empty the in-line filter to protect from freezing while not operating the drill.
Mincon – “Leaders in Rock Drilling Technology” Page 14
2.3.6 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 ½ pint (¼ litre) of rock drill oil as described above.
Fit the hammer to the drilling rig 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.
2.3.7 Lubrication
It is vital for HDD 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. There should be visual evidence of oil around the drill bit shank and within the tube joints when changing tubes.
Litres/Hour
0.5 1 1.5
1500
2.0 2.5
42.0 120
6.9
Pressure - Bar
13.8 20.7 27.6 34.5
48.9
1250
1000
750
500
250
35.0
28.0
21.0
14.0
7.0
100
80
60
40
20
0
ISO320
ISO150
37.8
26.7
15.6
4.4
-6.7
-17.8
1 2 3
US Pints/Hour
4 5
-20
ISO46
100 200 300 400 500
-28.9
In wet drilling (above 2gpm/8 lpm) the oil consumption should be doubled
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 oil 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 its components. Hydraulic oils, engine oils, gear oils and diesel are not recommended for lubricating HDD hammers.
2.3.8 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 threads.
Mincon – “Leaders in Rock Drilling Technology” Page 15
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 combustive 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. All tools and spanners used for the drill bit and break out flats must 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.
The Air Consumption of the hammer is as per the chart below. The chart represents operating pressure and equivalent air consumption at sea level with an ambient temperature of 68°F (20°C).
Mincon – “Leaders in Rock Drilling Technology” Page 16
Both temperature and altitude have an effect on air and consequently on compressed air. Higher temperatures and higher altitudes result in air becoming thinner, less dense, and the effect of this is a reduction in a compressor’s delivery pressure.
The table below shows just how much operating pressure can be affected by these two factors. For example, if we take a compressor which will deliver 1000 cfm at sea level, this same compressor will only deliver 745 cfm at 9,000ft, given a temperature of 40 degrees
Fahrenheit (4.4 degrees Celsius).
°F
-40
-30
-20
-10
0
10
20
30
40
50
60
70
°C
80
90
100
110
26.7
32.2
37.8
43.3
120 48.9
2.4 Servicing
-40
-34.4
-28.9
-23.3
-17.8
-12.2
-6.7
-1.1
4.4
10
15.6
21.1
Sea Level 1000ft 3000ft 5000ft 7000ft 9000ft 11000ft 13000ft 15000ft
Sea Level 305m 915m 1524m 2134m 2744m 3354m 3963m 4573m
0.959
0.978
0.997
1.016
1.035
1.055
1.074
1.093
1.112
0.805
0.824
0.844
0.863
0.882
0.901
0.920
0.939
0.835 0.898
0.855 0.920
0.875 0.941
0.895 0.962
0.915 0.984
0.935 1.005
0.954 1.026
0.974 1.048
0.994 1.069
1.014 1.091
1.034 1.112
1.054 1.133
1.074 1.155
1.094 1.176
1.114 1.198
1.133 1.219
1.153 1.240
1.152
1.175
1.198
1.221
1.244
1.267
1.290
1.313
1.336
0.968
0.991
1.014
1.037
1.060
1.083
1.106
1.129
1.241
1.266
1.291
1.316
1.341
1.365
1.390
1.415
1.440
1.043
1.068
1.092
1.117
1.142
1.167
1.192
1.217
1.341
1.368
1.395
1.422
1.449
1.475
1.502
1.529
1.556
1.127
1.154
1.180
1.207
1.234
1.261
1.288
1.315
1.449
1.478
1.507
1.536
1.565
1.594
1.623
1.652
1.681
1.217
1.246
1.275
1.304
1.333
1.362
1.391
1.420
1.568
1.600
1.631
1.662
1.694
1.725
1.756
1.783
1.819
1.317
1.349
1.380
1.411
1.443
1.474
1.506
1.537
1.698
1.732
1.766
1.800
1.834
1.868
1.902
1.936
1.970
1.426
1.460
1.494
1.528
1.562
1.596
1.630
1.664
2.4.1 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.
2.4.2 Opening Chuck and Backhead
The threads used in Mincon Hammers are right hand threads. Proper tools and break-out systems should be used at all times to dismantle HDD hammers, otherwise damage 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.
Mincon – “Leaders in Rock Drilling Technology” Page 17
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.
2.4.3 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 detached and causing injury. This can occur if the O Ring on the bit retaining rings is missing or damaged. Before fitting a new drill 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.
2.4.4 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, if 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 wear sleeve and come out. It can then be pulled out by hand.
2.4.5 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.
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.
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 is evidence of such cracking. Check the strike face of the piston for cracking or damage.
2.4.6 Checking Wear Limits
The performance of the hammer 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.
2.4.7 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.
Mincon – “Leaders in Rock Drilling Technology” Page 18
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 is 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 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.
Mincon – “Leaders in Rock Drilling Technology” Page 19
3
4
5
6
3 Appendix
3.1 HDD50 exploded view and Parts List
1
17
16
2 18
27
9
19
20
7
10
11
12
13
15
21
22
23
24
14
25
26
28
29
30
31
32
MINCON HDD50 PARTS LIST AND
SPECIFICATIONS
Description Part no. Item
1
2
3
4
5
6
7
MINCON HDD50 HAMMER
SONDE HOUSING ASSEMBLY
SONDE HOUSING BACKHEAD
SONDE SPACER
SONDE CARRIAGE
O-RING
DIVERTER
O-RING
SEALING SLEEVE
MHD401AS01
MHS401AS01
MHS401BH02
MHS402SS01
MN585
MHS421OR01
MHS405DV01
MHS421OR01
MHS406SL01
8
9
O-RING
SONDE HOUSING SLEEVE
MHS421OR01
MHS404SH01
10 O-RING
11 CARRIAGE GUIDE
MHS421OR01
MHS407CG01
12 SONDE HOUSING SEATING RING MHS403SR01
13 O-RING
14 LOCATING PIN
MHS421OR01
MHS408LP01
15 BENT SUB
16 CHECK VALVE
17 CHOKE
CHOKE 1/8 (3.2mm)
CHOKE 3/16 (4.8mm)
18 SPRING
19 STEEL MAKE UP RING
20 LOCK RING
21 AIR DISTRIBUTOR
22 O-RING
23 O-RING
24 SEATING RING
25 INNER CYLINDER
26 PISTON
27 WEAR SLEEVE
28 PISTON RETAINING RING
29 ALIGNER
30 BIT RETAINING RING
31 CHUCK
32 BIT
MHD401BH02
MB502CV01
MB506CH01
MB506CH02
MB506CH03
MD603SP01
MD404SM01
MD405LR01
MD407DR03
MD421OR01
MD422OR01
MD409SR01
MD408IC02
MD410PN04
MHD411WS02
MD412PR01
MHD413BB01
MHD413BR01
MHD414CK01
8
Mincon – “Leaders in Rock Drilling Technology” Page 20
3.2 HDD50 Hammer Service Log
WEARSLEEVE / PISTON CLEARANCE
Part
Wearsleeve
Piston OD
New Dimension
A 3.080” (78.23mm)
B 3.075” (78.10mm)
As Measured
C
D
Wear
C-A
B-D
Chuck end
Actual Clearance Discard Clearance
C-D
≥ 0.010” (0.25mm)
C
D
Part
Cylinder ID
Piston OD
INNER CYLINDER / PISTON CLEARANCE
New Dimension As Measured Wear
A 2.678” (68.03mm)
B 2.673” (67.90mm)
C
D
C-A
B-D
Actual Clearance Discard Clearance
C-D
≥ 0.010” (0.25mm)
Part
Distributor Probe OD
Piston ID
D C
DISTRIBUTOR PROBE / PISTON ID CLEARANCE
New Dimension
A 1.055” (27.00mm)
B 1.063” (27.20mm)
As Measured
C
D
Wear
C-A
B-D
Actual Clearance Discard Clearance
C-D
≥ 0.010” (0.25mm)
C D
Description
EXTERNAL WEAR
Wearsleeve Discard Dimension:
Note: Chuck should be replaced when wear transfers to wearsleeve.
Wear Limit
3.425” (87.0mm)
As Measured
Mincon – “Leaders in Rock Drilling Technology” Page 21
4 Warranty
Mincon Hardrock Directional Drilling Hammers
Warranty, January 2005
Mincon warrants that the Mincon Hardrock Directional Drilling Systems 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 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.
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 to the sale of DTH Hammers or spare parts therefore, 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.
•
If it is evident that the hammer or its components have achieved a reasonable proportion of their anticipated life.
Mincon – “Leaders in Rock Drilling Technology” Page 22
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Key Features
- Directional drilling capability
- Robust design for durability
- Efficient drilling performance
- Detailed operation and servicing instructions
