MM20 Hydraulic Rock Drill User Manual – Installation, Operation & Maintenance Manual PDF

Description

The MM20 Hydraulic Rock Drill User Manual is the complete instruction, operation and maintenance manual for the MM20 high frequency hydraulic rock drill, a machine built for underground production drilling and tunnelling with one hydraulic rotation motor and a separate stainless steel flushing box that accepts air, water or air-water mist. This MM20 Hydraulic Rock Drill User Manual runs 130 pages and begins where every operator should begin – the safety information chapter, the warning and attention symbols, and the general safety instructions that apply to drilling, servicing and rig installation. From there it moves through the machine itself: hydraulic ports and other connections, accumulator identification and pressure measurement, oil selection, shank and gearing lubrication, and the percussion, rotation and flushing systems that decide how the drill actually performs in rock.

File Details

• Manual type: User / Instruction Manual covering installation, operation, maintenance and troubleshooting
• Equipment: MM20 hydraulic rock drill
• Language: English
• Page count: 130 pages
• File format: PDF
• Copyright date shown: 2022

Chapters Covered

• 1. Safety Information – symbols, general safety instructions
• 2. Important Information – warranty, manuals
• 3. Introduction
• 4. Product Information – general information, product identification, product main assembly
• 5. Connections – hydraulic ports and other connections
• 6. Accumulators – identification, pressure and maintenance, measuring the accumulator pressure
• 7. Oil Recommendations – oil choice, oil specifications, hydraulic oils for rock drills
• 8. Lubrication Requirements – lubrication of the shank and gearing
• 9. Percussion and Rotation Systems – percussion system, rotation system, rotation speed chart
• 10. Flushing System – flushing components, air flushing, water flushing
• 11. Installing the Rock Drill – installation and design, drill tools, commissioning, commissioning checkup
• 12. Design Notes
• 13. Operational Instructions – drilling basics, notes, drilling problems
• 14. Maintenance of the Rock Drill – inspection and maintenance schedule, tools and tool kits, accumulator charger, spare parts, maintenance tips and procedures, storing and decommissioning, maintenance interval table, damage prevention, maintenance record
• 15. Accumulator Instructions – accumulator type and serial number, tool kits, assembly, maintenance and maintenance procedure
• 16. Assembly Drawings – main assembly, front section, flushing box, gear box, section flange, gear housing, rotation bushing, body cylinder, body, seal flange, valve, rear flange, rear cover, accumulator, stud bolts, flushing adapter
• 17. Replacing the Shank Adapter – removal and reassembly
• 18. Front Section Maintenance – flushing collar disassembly, replacing seals and O-rings, reassembly
• 19. Rotation System Maintenance – disassembly, section flange maintenance, gear box disassembly, rotation bushing maintenance, reassembly
• 20. Body Cylinder Maintenance – disassembly, seal flange maintenance, valve package disassembly and assembly
• 21. Reassembly – inner cylinder and section flange, valve, piston and rear flange, rear cover, gear box and rotation motor, flushing collar
• 22. Technical Information – dimensions, technical specifications, bolt tightening torque, lifting instructions
• Annex A: Troubleshooting Guide
• Annex B: Motor Drain Port

Read end to end, the document gives a technician a complete working picture of the MM20 rather than a set of isolated chapters. The first half establishes how the drill should be connected, fed, lubricated and flushed before it ever strikes rock, including the commissioning checkup sequence that must be walked through step by step. The second half turns the drill into a serviceable machine, with disassembly and reassembly procedures for the shank adapter, flushing collar, section flange, gear box, rotation bushing, body cylinder, valve package, piston and rear cover, each backed by the drawings and torque figures needed to put it back together correctly.

Drilling Settings and Pressure Values You Can Work From

The operational chapters give real numbers instead of vague guidance. Percussion pressure is adjustable according to drilling conditions with a working range of 90-175 bar, and collaring starts at lower pressure – a minimum of 90 bar – before being raised to the optimal drilling pressure. Percussion flow capacity is stated at 110 LPM, and the return line should sit between 6 and 20 bar, measured both when collaring and during continuous drilling. Rotation pressure normally varies between 40 and 80 bar, with 210 bar as the maximum continuous pressure, and the manual spells out what a rotation pressure over 100 bar during drilling probably means. Feed force is capped at 15 kN, and the manual is explicit that feed force should be adjusted rather than feed rate when chasing a better penetration speed.

Lubrication, Oil and Flushing Requirements

The MM20 Hydraulic Rock Drill User Manual treats lubrication as a separate discipline from hydraulic oil. Shank and gearing run on pressurised air-oil mist at 6-7 bar with a stated consumption of 200-300 g/hour for the single-motor version, and the recommended lubricant types are named. Viscosity limits for the hydraulic oil are given as a table, with 2000 cSt maximum at cold start, 30-60 cSt optimum operating viscosity, a maximum operating oil temperature of 70 degrees C and a lowest temporary viscosity of 20 cSt. Air flushing, water flushing and air-water mist are each covered with their own flow, pressure and velocity figures, along with the differences in seal orientation between air and water flushing setups and the indicator holes that warn when flushing seals need replacing.

Maintenance Intervals and the Parts That Wear

A full maintenance interval table maps every wear part to its location and to the 500, 1000, 1500 and 2000 hour marks, marking each one as either a replacement recommendation or an inspection point. Seals, O-rings, wipers, accumulator diaphragms and small needle bearings are listed for replacement at 500 hours; pistons, seal flanges, inner cylinders, flanges and the rotation bushing are scheduled out at 2000 hours. The rock drill is described as requiring maintenance every 500 hours even when it runs well, with carriage bolts checked twice a week and accumulator pressures checked weekly.

Assembly Drawings and Exploded Views

Sixteen numbered assembly drawing sections break the drill down into its subassemblies – main assembly, front section, flushing box, gear box, section flange, gear housing, rotation bushing, body cylinder, body, seal flange, valve, rear flange, rear cover, accumulator, stud bolts and flushing adapter – each with a reference table identifying the part, quantity, subassembly code and recommended replacement interval. These work alongside the step-by-step disassembly and reassembly procedures so that a part can be located, removed, inspected and refitted in the right order and the right direction.

Troubleshooting by Symptom

Annex A is a structured troubleshooting guide that starts from the symptom and works back to the cause. It covers high rotation pressure, rotation system faults including uneven rotation and loss of rotation, excessive vibration of hoses or of the drill itself, percussion faults and a sudden drop in percussion pressure, uneven or declining drilling speed, breakages of side bolts and carriage bolts, broken pistons, worn shank adapters, cavitation and corrosion inside the body cylinder, hydraulic oil leaks and overheating of the percussion system, rotation system or drill tools. Each branch pairs a probable cause with the corrective action and the check that confirms it, which turns the manual into something usable on a machine that is already down.

Why This MM20 Hydraulic Rock Drill User Manual Earns Its Place in the Workshop

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This MM20 Hydraulic Rock Drill User Manual supports the jobs that actually cost money when they go wrong: commissioning a drill onto a new rig so the feed, rotation, percussion and flushing are set correctly from the first hole; diagnosing a drop in penetration or a rise in rotation pressure before it becomes a seized gear box; replacing flushing seals and shank adapters without damaging the collar or the rotation bushing; and rebuilding the body cylinder, valve package and piston with the correct seal facing, installation depth and bolt tightening torques of 80 Nm, 160 Nm, 200 Nm and 500 Nm. Getting those details right is the difference between a drill that runs its full interval and one that returns to the workshop early with cavitation damage, bent drill steels or scored cylinder surfaces. The manual is supplied as an instant PDF download – no shipping, no waiting – and can be opened on a laptop, tablet or phone in the workshop or the cab, searched by chapter and printed page by page as a bench reference for the job in front of you.