Leading Innovative Company "Maruzen”
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ROCK DRILL / DH205

Built for Hard Rock Applications

1.Designed for Hard Rock Formations

Engineered for tough geological conditions in Canada and Northern Europe, where hard bedrock demands consistent power and durability.

2. Ideal for Pre-Drilling Applications

Perfect for pre-drilling holes for wedges, splitters, and blasting cartridges, ensuring accurate and efficient preparation for rock breaking operations.

3. Simple, Self-Contained System

Operates with only a hydraulic power unit and the drill.

Thanks to the built-in-Compressor, no additional compressors or complex setups required—reducing equipment, costs, and setup time.

4. Reliable After-Sales Support

Backed by experienced local distributors with professional after-sales service, ensuring minimal downtime and long-term operational reliability.

SPECIFICATIONS

Dimensions(mm) L694×W410×T110
Weight(kg) 22(Without hoses)
Working Pressure(MPa) 7.8～11.8
Max Pressure (MPa) 20.6
Oil Flow(ℓ/min)
 30ℓ/min
Blow Per Minute 1000～1350 bpm
Vibration Level (ISO08662-5)

3 axis
8.6m/s²（20L/min）
9.5m/s² (25L/min）
Sound Power (2000/14/EC)

-Measured Sound Power Level　　Lwa = 102dB(A)
-Guaranteed Sound Power Level    Lwa =103dB
Shank Size

7/8”x4-1/4” (22 x 108mm)
Coupling

3/8” Couplers
Built-in Compressor
Extension Hose Max1/2”×20
Recommended Hydraulic Oil ISO VG32(Standard), ISO VG46 or equivalent
Other External air supply available

USE UH130 FOR POWER SOURCE


･Adjustable oil flow in three modes.
　Choose either 20ℓ/min, 25ℓ/min, or 30ℓ/min.

 

 

 

　(Check specification of UH130)

 

 

 

 

 

[EXTERNAL AIR SUPPLY]

1. In case of deeper drilling(1.5m – 3.0m), air supply from outer source(air compressor)is more effective for drilling.

(1) Recommended specifications of air source(air compressor)

Air Consumption 0.57㎥/min
Air Pressure 0.5MPa*1

*1:When the air pressure of air source(compressor)is higher use regulator and adjust the air pressure.

Be careful not to enter microscopic dust, sand or moisture into the machine through the air line.
Otherwise, machine may be mechanically trouble.
To supply clean and dry air into the machine, set-up of the air cleaner is recommendable.

 

(2) How to connect to external air supply
 Take of Plug(47)and connect air hose(IDΦ8.5). Connection of air hose is PT1/4.

 

PRODUCT MOVIES

HOW TO USE

Be sure that pressure and oil flow of the power source is suitable with specification above.

1. Before Start

(1) Open the drill stay and inset the rod.

(2) Close the drill stay. Make sure the rod(or other tools)is firmly locked.

(3) Make sure there are no dust, mud, or other foreigner substance on couplers when attaching extension hose and power source.(Lock couplers after connection.)

(4) Start the power source and allow hydraulic oil to flow into rock drill. 

 

2. Operation

(1) Drilling

①Place the end of the rod on the place where you intend to drill, press down the rock drill gently, grip the control lever and start drilling.
   Rotation direction is clockwise when you look from the top of drill.
   (When rotating un-clockwise, please check the hoses are connected correctly.)

②For preventing rock drill to bouncing around while operating, let the end of the rod closed to one of your feet and drill until the rock drill can be stably operated.

③Adjust the rotation speed according to the type of the rock.

 

MODE Rotation per minutes Application
1 100～150rpm Hard Rock
2 200～250rpm Medium to Hard Rock
3 350～400rpm Soft Rock

*Rotation per minute above is rough standard. Please choose the mode depending on situation.

 

(2) Breaking

① Use fluted moil point to have air escape.

② Open drill stay and insert moil point.

③ Close the drill stay. Make sure the moil point has been fastened firmly.

④ Adjust the knob to “0″ position.

 

3. After the Operation

(1) After the operation, stop the power source.

(2) Detach the connection hoses.

(3) Make sure all the couplers on standard hoses(attached to rock drill)and connection hoses are attached to each other to prevent dirt and etc. entering.

(4) Open the drill stay and remove moil point or tool.

(5) Clean all dirt, mud, and etc. on the rock drill.

MAINTENANCE

1. Please carry out the following processing before long-term storage.

 

(1) Connect DH205 with power source, and use moil point to push up the piston to the end.

(2) Apply anti-rust oil to piston from the shank end.

(3) Taking off (58) cleaner cover and (56) cleaner element and (57) cleaner sponge and apply anti-rust oil into the machine through the hole of cleaner case, and operate for about 1 minute in this condition. After that, put on cleaner cover and cleaner element as before.

< CAUTION >
Failure to observe above (1) (2) (3) can cause rust inside the rock drill and lead to oil leak and anchoring.

(4) Clean air cleaner.

(5) Wipe the main body with cloth wetting with oil and clean it.
   Put on cover and store at the place where there are no humidity.

 

2. PERIODICAL INSPECTIONS

Ask your dealer for the periodical inspections.

Inspection Item Inspection Cycle
Nitrogen gas charge in accumulator 300 hours or 1 Year
Replacement of accumulator diaphragm  

 

500 hours or 2 Years
Replacement of O-Ring
Replacement of U-Cup Packing
Replacement of compressor piston ring

*Accumulator Nitrogen gas pressure: 3.9MPa (40kgt/㎠)

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