Atlas Copco Secoroc YT Series Specifications

Secoroc YT Series Rock Drill
Secoroc YT28 Pusher Leg Rock DRILL
Operator's instructions / Spare parts list
Secoroc Rock Drilling Tools

Foreword
Thank you for selecting the Secoroc YT28 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.
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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
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Scope of application
Secoroc YT28 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 YT28 is suitable for both horizontal and upward anchor holes in medium-
hard and hard rocks (f=8-18). The hole diameter range is from 32 mm to 42 mm
with depths up to 5 meters. The Rock Drill is equipped with lubricator FY200C.
Secoroc YT28 is intended to be used together with pusher leg FT160BC and
FT160BD for different tunneling and work conditions. It is also designed for dry
drilling or wet drilling mounted on rigs.
Specification
Pneumatic rock drill YT28
Weight 26 kg
Dimension (L x W x H) 661x250x202 mm
Cylinder diameter 80 mm
Piston stroke 60 mm
Working pressure 3,5–5 Bar(e)
Impact energy (at 5 bar(e)) ≥63 J
Air consumption (at 5 bar(e)) ≤58 l/s
Impact frequency (at 5 bar(e)) ≥35 Hz
Water pressure working pressure -1 Bar(e)
Air hose inner diameter 25 mm
Water hose inner diameter 13 mm
Drilling diameter 34–42 mm
Max Drilling depth 5 m
Working temperature -30 to +45 ºC
Shank size H22x108±1 mm
Lubricator FY200C
Weight 1.02 kg
Capacity 0.20 litre
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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 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.
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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
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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.
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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".
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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
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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.
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