Atlas Copco Secoroc YT29A Specifications

Secoroc Rock Drilling Tools

Secoroc YT29A Pusher Leg Rock Drill

Operator's instructions / Spare parts list

Secoroc YT Series Rock Drill

Foreword

Thank you for selecting the Secoroc YT29A pusher leg rock drill.

These instructions were developed to help you get the best performance and

productivity from the use of your new rock drill.

Please refer to them also for correct maintenance of the machine.

Table of Contents

Scope of application ................................................... 4

Specification ....................................................... 4

Safety instructions..................................................... 5

Operation ............................................................ 6

Using the rock drill for the first time.................................... 6

Preparations before starting .......................................... 6

Fitting and removing the tool ......................................... 7

Before fitting the working tool ......................................7

Fitting the working tool ............................................8

Removing the working tool .........................................8

Attaching the pusher leg to the rock drill ................................ 8

Controls ........................................................... 9

Throttle lever.....................................................9

Feed control .....................................................9

Trigger.........................................................10

Oil regulating valve ..............................................10

Drilling ........................................................... 11

Starting the rock drill .............................................11

Stopping the rock drill ............................................11

Re-positioning the pusher leg .....................................11

Blow-cleaning the drill hole........................................11

When you have finished drilling ....................................12

Maintenance ...................................................... 12

Selection of spare parts ..........................................12

Once a shift (after 8 hours of operation) .............................12

Once a week (after 40 hours of operation) ............................13

Once a month (after 200 hours of operation)..........................13

Measures to prevent freezing ........................................ 13

Scrapping and waste disposal ....................................... 13

Trouble shooting ..................................................... 14

Spare parts list and exploded drawing ................................... 16

Scope of application

Secoroc YT29A is a heavy-duty pusher leg Rock Drill featuring high efficiency and

low air consumption. It is primarily designed for drilling in mines, hydropower

stations, and road construction projects. It is also a new product suitable for

tunneling and other stone works in mining and metallurgical industry.

Secoroc YT29A is suitable for both horizontal and upward anchor holes in medium-

hard and hard rocks (100–350 MPa). The hole diameter range is from 32 mm to 45

mm with depths up to 5 meters. The Rock Drill is equipped with lubricator FY250.

Secoroc YT29A is intended to be used together with pusher leg FT160A, FT160B,

FT160C or FT170 for different tunneling and work conditions. It is also designed for

dry drilling or wet drilling mounted on rigs.

Specification

Pneumatic rock drill YT29A

Weight 27 kg

Dimension (L x W x H) 659x248x205 mm

Cylinder diameter 82 mm

Piston stroke 60 mm

Working pressure 3,5–5 Bar(e)

Impact energy (at 5 bar(e)) ≥70 J

Air consumption (at 5 bar(e)) ≤65 l/s

Impact frequency (at 5 bar(e)) ≥37 Hz

Water pressure working pressure -1 Bar(e)

Air hose inner diameter 25 mm

Water hose inner diameter 13 mm

Drilling diameter 32–45 mm

Max Drilling depth 5 m

Working temperature -30 to +45 ºC

Shank size H22x108±1 mm

Noise level ≤127 dB(A)

Lubricator FY250

Weight 1.2 kg

Capacity 0.25 litre

Safety instructions

To reduce the risk of serious injury or death to yourself or others, carefully read

through this instruction booklet before putting the rock drill to use. Always follow

the instructions given.

hAlways wear a safety helmet, goggles and ear protectors with CE mark during

drilling. Any local regulations that exist must also be observed.

hWhen drilling in certain minerals, there is a risk of spark generation. Before

starting work, check that the machine is approved (in accordance with local

regulations) for work under such conditions.

hAlways take great care when using the machine. The working tool is subjected to

heavy loading and can break, with a risk of injury to personnel.

hCheck that the hoses used are of the right quality, and that all hose connections

are in good condition and properly tightened.

hBefore starting work on any of the systems, make sure that the air and water

systems are without pressure.

hMake sure that there are no concealed wires or other sources of electricity. Never

drill near any electric wires or other sources of electricity.

Operation

Using the rock drill for the first time

When the rock drill arrives from the factory, the inside of the tool is coated with

heavy oil to prevent corrosion.

After unpacking and installing the tool, pour a small amount of lubrication oil into

the air connection and operate the tool on partial throttle to clean the interior.

Follow this immediately with a liberal amount of air tool oil.

The rock drill and pusher leg are lubricated with oil mixed with compressed air,

which is taken to the parts that need continuous lubrication. Oil is metered into the

compressed air using the FY250 lubricator connected to the air line.

Preparations before starting

1. Check the drilling equipment

hCheck that all of the drilling equipment is in good working order.

hCheck that the impact surface of the working tool shank is flat, with no signs of

wear.

hMake sure that the air inlet and exhaust ports are free from obstructions.

hCheck that the flushing holes in the working tool and drill bit are not blocked, and

that the flushing air/water flows through without obstruction.

hEnsure that the fittings are tight and leak-proof.

WARNING

Always check for damaged or loose hoses and fittings before operation.

Whipping hoses can cause serious injury.

2. Blow out the air hose

hEvery day before using the drill, blow out the air hose to clear it from

accumulated dirt and moisture.

3. Fill the lubricator with oil

Check the lubrication oil level, fill the lubricator if necessary.

Note! Check that the chuck and working tool shank are always covered by a film of

oil.

Note! Always use a recommended lubricant. Operation without lubrication is not

allowed.

Lubricant Recommendation

Air tool oil Use a mineral-based air tool oil

Ambient temperature ºC Viscosity grade (ISO 3448)

-30 to 0 ISO VG 32-68

-10 to +20 ISO VG 68-100

+10 to +50 ISO VG 100-150

4. Air/water pressure and hose dimensions

Air pressure

Ensure that the compressor can deliver the required air pressure of 5 bar at the tool.

hHigh pressure (>6.3 bar) causes rough operation and damage.

hLow pressure (<4 bar) results in a slow drilling speed.

Water pressure

Make sure that the water pressure is set to around 3 bar.

Note! Maximum water pressure is 1 bar less than the working pressure. For

example if the air pressure is 5 bar, the water pressure must be below 4 bar

to prevent water entering the impact mechanism.

Note! Dry drilling is strictly prohibited. Operation without air- and water tubes is not

allowed as it will result in poor drilling performance.

Hose dimensions

The air hose diameter must be no less than 25mm. Inner diameter of connection

nipple and hose must be no less than 19mm. The ideal overall air hose length is

less than 15m.

Fitting and removing the tool

Before fitting the working tool

hCheck that the tool shank is of the correct size and length for the chuck used.

hThe shank must be clean and the tool must be in good condition.

hThe suitable quenching hardness of the shank is HRC48-53. Harder end face will

cause piston damaged and breakage of the end face of the piston. If the shank

face is too soft, it will be easily deformed by the piston, which will result in

difficulty in removing the working tool.

hShank end face shall be flat and perpendicular to the axis.

hRemove sharp edges from the shank's end face. Rough shank surface will cause

premature piston failure.

hInspect the bits: Dull bits will slow down the drilling speed and overstrain the drill

mechanism. When changing bits make sure that the new bit is the correct size to

follow your previous bore.

hBefore drilling check that the flushing hole in the working tool is not blocked.

Fitting the working tool

1. Push the retainer outwards in the direction of the arrow (see picture below),

until the front portion of the retainer is able to accommodate the working tool

collar.

2. Insert the drill in the chuck.

3. When the drill bottoms, push back the retainer to lock it.

Removing the working tool

1. Push the retainer outwards in the direction of the arrow until the working tool

collar disengages from the front of the retainer.

2. Pull the working tool out.

3. Push back the retainer.

Attaching the pusher leg to the rock drill

hMount the pusher leg (1), lock sleeve (2), rubber pad (3), washer (4) and locking

nut (5) in the order shown in the picture below.

hTurn the locking nut clockwise with a wrench until you hear a "click".

Controls

Throttle lever

The rock drill is equipped with a throttle lever for regulating both the compressed

air to the percussion mechanism and the flushing water.

A. Extra blowing, water flushing off, impact and rotation off.

B. Stop position, air and water off

C. Low throttle, air to pusher leg, water flushing

D. Medium throttle

E. Full throttle

Feed control

Adjust the feed force by means of the feed control lever as follows:

A. Pushing the lever in this direction will increase feed force.

B. Pulling the lever in this direction will decrease feed force

Trigger

When the trigger (A) is pushed in, the feed force stops abruptly and the setting

on the feed control lever is overridden. The piston rod in the pusher leg retracts

automatically. This function is used for example to adjust the height of the rock

drill, when rigging up the pusher leg, or when there is a tendency to jam. When the

trigger is released, the feed control setting is activated again.

Oil regulating valve

Oil dosing is controlled by means of a screwdriver.

Check that sufficient lubrication is obtained by putting your hand in front of the

exhaust port while adjusting the regulating valve. If the hand is covered by a thin

film of oil after a few seconds, the lubricator has been correctly adjusted.

The amount of oil going into the rock drill increases when turning the valve counter

clockwise, and it decreases when turning the valve clockwise. Oil consumption is

2.5–6 ml/minute.

Note! Tighten the nut after regulation.

Note! To much oil will have negative effects on the operation whilst to little will

result in damage to parts as the temperature rises during operation.

Table of contents

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