Atlas Copco Secoroc YT29SA Specifications

Secoroc Rock Drilling Tools
Secoroc YT29SA Pusher Leg Rock Drill
Operator's instructions / Spare parts list
Secoroc YT Series Rock Drill

YT29SA
3
Foreword
Thank you for selecting the Secoroc pusher leg rock drill YT29SA.
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 breaker.
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
Controls ........................................................... 8
Throttle lever.....................................................8
Oil regulating valve ...............................................9
Drilling ............................................................ 9
Starting the rock drill ..............................................9
Stopping the rock drill .............................................9
Blow-cleaning the drill hole.........................................9
When you have finished drilling ....................................10
Maintenance ...................................................... 10
Selection of spare parts ..........................................10
Once a shift (after 8 hours of operation) .............................10
Once a week (after 40 hours of operation) ............................11
Once a month (after 200 hours of operation)..........................11
Measures to prevent freezing ........................................ 11
Scrapping and waste disposal ....................................... 11
Trouble shooting ..................................................... 12
Spare parts list and exploded drawing ................................... 14
2

YT29SA YT29SA
4 5
Scope of application
YT29SA 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 tunnelling and
other stone works such as mining and the metallurgical industry.
YT29SA is suitable for drilling horizontal, inclined and upward anchor holes in
medium-hard and hard rocks (100-350). 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.
Specification
Pneumatic rock drill YT29SA
Weight 27.5 kg
Dimensions (L x W x H) 765x248x205 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 B22x159 mm
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 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.

YT29SA YT29SA
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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
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 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 at 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 tube is not
allowed as it will result in poor drilling performance.
Hose dimensions
The air hose diameter must be no less than 25mm. The 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. A harder end face will
cause piston damaged and breakage of the end face of the piston. If 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.

YT29SA YT29SA
8 9
Fitting the working tool
1. Pull the retainer upwards 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. Pull the retainer upwards 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.
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
Oil regulating valve
The oil dosage is adjusted with 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 adjustment.
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.
Drilling
Starting the rock drill
1. Open the main valve for compressed air.
2. Open the cock for the flushing water.
3. Adjust the feed control (on the pusher leg) to give a suitable feed force for
collaring the hole.
4. Align the rock drill so that the working tool touches the desired collaring point.
5. Move the throttle lever forward a little, which will start water flushing,
percussion and rotation.
6. Collar the hole with reduced feed force.
7. Move the throttle lever fully forward once the working tool has gained a
secure footing in the rock.
8. Adjust the feed force so that the maximum penetration rate is obtained.
Note! Do not bend the working tool as this will increase wear of the shank bushing
and piston. Furthermore, it can also affect drilling efficiency and increase the
risk of working tool breakage.
Stopping the rock drill
Pull the throttle lever backwards, which will stop percussion, rotation and flushing
water.
Blow-cleaning the drill hole
CAUTION
Move to the side and cover your eyes before starting to blow-clean the drill hole.
When blow-cleaning, particles and dirty flushing water can emerge at speed from
the drill hole.
hAlways wear impact resistant eye protection with side protection to avoid
injury.
hMake sure that no co-workers are in range when blow-cleaning.
If powerful blow-cleaning of the drill hole is required, turn the throttle lever fully
backwards beyond the stop position for extra blowing, whereupon the rock drill
stops. This can be done during drilling. When the drill hole is clean, turn the throttle
lever forwards again to re-start the rock drill.

YT29SA YT29SA
10 11
When you have finished drilling
Run the rock drill at medium speed when retracting the working tool from the
drilled hole.
Lay down the rock drill on a stone, wooden plank or similar object, so as to prevent
drill cuttings and other foreign matter from entering the chuck.
Turn off the water pressure before the air pressure. Run the rock drill for a few
seconds to clean out water and moisture after the water has been shut off.
Maintenance
Regular maintenance is a prerequisite for machine safety. Replace damaged and
worn components in good time. For a major service to the machine, contact your
nearest authorized workshop.
Check the machine and tools for wear and damage at regular intervals. Do not use
very worn or damaged tools.
When cleaning mechanical parts with a solvent, make sure that you comply with
current health and safety regulations and ensure that there is sufficient ventilation.
Daily maintenance, regular checking of wearing parts and carrying out repairs in
good time prevents breakdowns and increases the service life of the machine.
hAlways oil the rock drill and pusher leg well, before you put them into storage.
hStore in a clean and dry place.
hMake sure that no foreign matter enters the machine.
hProtect the chuck using a wooden plug or a clean piece of cotton waste.
hAlways hose down and wipe clean the rock drill and pusher leg after use.
hIn the case of long-term storage, pour a quantity of oil directly into the rock-drill's
air intake and then turn on the air briefly. This will protect the machine from
corrosion.
Selection of spare parts
This machine is a heavy-duty rock drill; there are strict requirements on selecting
spare parts. Use only genuine parts for replacement, to ensure stable performance.
Do not use pattern parts, which not only have a short working life but also cause
consequential damage to other parts, due to the differing measurements and
methods of manufacturing.
Once a shift (after 8 hours of operation)
hCheck the wear in the chuck bushing. If the wear limit has been exceeded, the
working tool shank will wear more quickly, or become deformed. This will lead to
stoppages and increased working tool consumption.
hCheck the tightness of the side-bolt nuts.
The tightening torque shall be 150 Nm.
hCheck the rock drill's connection to the pusher leg.
hCheck the hoses, couplings and controls for leakage and damage.
hCheck that the rock drill and pusher leg are receiving enough lubrication. Fill the
lubricator as necessary.
hDrain the water separator.
hCheck the air and water pressure. Make sure that the water pressure is at least 1
bar lower than the air pressure.
Once a week (after 40 hours of operation)
Carry out a basic check of all functions of the drilling equipment.
Once a month (after 200 hours of operation)
hSend the rock drill to a workshop for inspection. The local operating conditions
will determine whether or not this is a suitable interval for overhauling the drill.
hDismantle and clean the lubricator.
hClean out the water separator.
Measures to prevent freezing
In low ambient temperatures, ice can form in the machine. This can be avoided if
the water in the compressed air is removed. This can be done by equipping the air
lines with water separators and drainage points for water condensate.
If the rock drill ices up, it must not be heated to melt the ice. Let the ice thaw at
room temperature.
Note!Do not pour methylated spirits or similar substances into the rock drill, as
they will interfere with the lubrication and lead to increased wear.
Scrapping and waste disposal
Used and worn-out machines must be disposed of in such a way that as much of
the material as possible can be recycled and the impact on the environment is kept
to a minimum.

YT29SA YT29SA
12 13
Trouble shooting
Problem Cause Solution
Decreased
penetration rate
Air leakage in hoses,
couplings
Change packings, and where
required, change parts in the
throttle valve
Shank sleeve Check the shank sleeve for
excessive wear. Replace if
necessary.
Air leakage due to worn
piston/cylinder
Replace the piston and/or cylinder
Air leakage due to worn
guide sleeve/pilot guide
Change the worn part
Insufficient feed
force
Piston rod seal (in pusher
leg) worn or deformed
Change the seal
Poor rotation Splines of the rifle nut worn Replace the rifle nut if the splines
are worn
Splines of the rifle bar worn
down
Replace the rifle bar when needed
Splines on the piston worn
down
Replace the piston when needed
The toothing in the ratchet
housing is worn out
Replace the ratchet housing if the
tooth housing is so worn that the
pawls have difficulty catching
The toothing in the ratchet
wheel is worn out
Replace the ratchet wheel if the
toothing is so worn that the pawls
have difficulty catching
Chuck nut worn out Replace the chuck nut if the splines
have been worn to 1/2 of the spline
width
Pawls worn Replace all pawls, all pawl springs
and all pawl pins
Uneven running Piston has seized in the
guide sleeve or the piston
guide
Replace the guide sleeve/piston
guide. If required, polish the piston.
Check the piston for heat damage
such as blue colouring and/or
fissures. If it is damaged in this
way, replace the piston as well
Dirty or damaged main
valve. Caused by impurities
or foreign matter entering
the drill with the compressed
air
Clean and polish the valve so that
it seals against the corresponding
cylindrical and plane sealing
surfaces. If this is not possible
because the defects are too serious,
the valve must be replaced
Freezing. Caused by leakage
in the flushing system or
by excess water in the
compressed air or by
excessive water pressure
Check the flushing tubes and seals
and the water pressure. Drain water
from the compressed air system. If
the problem continues,
fit a water separator in the airline
system.
Problem Cause Solution
The side bolts are unevenly
or insufficiently tightened.
Can cause the various parts
to lose their alignment,
resulting in the seizure
of the movable parts.
Abnormal strains on the
side bolt may result in
fracture at the threads.
Check and repair any damage to
the contact points and tighten the
bolts with the correct tightening
torque
The drill gets
hot
Lack of oil Add oil and check that it runs
through. It is not sufficient that
there is oil in the exhaust air.
There must also be an oil coating
on the shank of the working tool.
Freezing High level of humidity in the
compressed air
Use water traps
Water pressure higher than
the air pressure
Lower the water pressure
Water pipe
breakage
Misalignment of the shank Change working tool or shank
sleeve or both
Damaged flushing hole in
the shank
Change working tool
Chipping of the
piston tip
Misalignment of the shank Change the working tool or shank
sleeve or both
Excessive wear of the
piston tip
Change piston
Spline breakage Lack of lubrication Lower the water pressure if it is
the same as or greater than the
air pressure
Increase lubrication or change oil
Dirt intrusion (specially
when drilling upwards)
Increase service intervals
Piston breakage Lack of lubrication Lower the water pressure if it is
the same as or greater than the
air pressure
Increase lubrication or change oil
Uneven tension in the side
bolts
Tighten the bolts correctly
Worn guide sleeve/piston
guide (can be confirmed by
the cushion test)
Change the worn part
Side bolt
breakage
Uneven tension on the bolts Tighten the bolts correctly

Spare parts list
14 15
Spare parts list and exploded drawing No. Description Quantity Product no. Product code
1 Spring 1 96000179 9605-1-3312310169
2 Pin 1 96000180 9605-1-3312310170
3 Conical pipe connector 1 96000186 9605-1-3312310176
4 Hoop 1 96000540 9605-1-3312310723
5 Wing nut 1 96000185 9605-1-3312310175
6 Pipe connector 1 96000187 9605-1-3312310177
7 Air pipe swivel 1 96000825 9600-1-3312310022
8 Air pipe nut 1 96000823 9600-1-3312310020
9 O-ring 2 96000486 9605-1-3312310633
10 Pad 1 96000174 9605-1-3312310164
11 Retaining ring 1 96000182 9605-1-3312310172
12 Water pipe connector 1 96000120 9602-1-3312310105
13 Retained ring 1 96000121 9602-1-3312310106
14 O-ring 1 96000482 9605-1-3312310627
15 O-ring 1 96000501 9605-1-3312310670
16 Seal ring 1 96000129 9602-1-3312310117
17 Control valve 1 96000646 9605-1-3312311868
18 Control handle 1 96000152 9603-1-3312310141
19 Standard spring pad 1 96000534 9605-1-3312310716
20 Hexagonal nut, thin 1 96000524 9605-1-3312310704
21 Fixing pin 1 96000177 9605-1-3312310167
22 Plug 1 96000642 9605-1-3312311863
23 Conical spring 4 96000167 9605-1-3312310156
24 Ratchet pawl 4 96000166 9605-1-3312310155
25 Large seal sleeve 1 96000544 9605-1-3312310727
26 Right handle 1 96000163 9603-1-3312310152
27 Left handle attachment 1 96000165 9603-1-3312310154
28 Shockproof ha ndle 1 96000164 9603-1-3312310153
29 Spring cover 1 96000169 9605-1-3312310159
30 Steel retaining ring 1 96000183 9605-1-3312310173
31 Spring 1 96000170 9605-1-3312310160

Spare parts list
16 17
No. Description Quantity Product no. Product code
32 Pad 1 3312 3101 74 9605-1-3312310174
33 Water valve 1 3312 3101 61 9605-1-3312310161
34 Water valve 1 3312 3101 63 9605-1-3312310163
35 Seal ring 2 3312 3106 42 9605-1-3312310642
36 O-ring seal 1 3312 3101 71 9605-1-3312310171
37 Rubber pad 1 3312 3101 65 9605-1-3312310165
38 Back head 1 3312 3118 90 9605-1-3312311890
39 Water tube bush 1 3312 3100 35 9601-1-3312310035
40 Air tube pad 1 3312 3101 66 9605-1-3312310166
41 Ratchet 1 3312 3100 51 9605-1-3312310051
42 Dowel pin 1 3312 3100 39 9601-1-3312310039
43 Valve chest 1 3312 3100 52 9605-1-3312310052
44 Valve 1 3312 3100 53 9605-1-3312310053
45 Valve sleeve 1 3312 3118 60 9605-1-3312311860
46 Rifle bar 1 3312 3118 61 9605-1-3312311861
47 Rifle nut 1 3312 3100 56 9605-1-3312310056
48 Muffler 1 3312 3119 00 9602-1-3312311899
49 Hoop 1 3312 3107 25 9605-1-3312310725
50 Cylinder 1 3312 3118 89 9605-1-3312311889
51 Guide sleeve set 1 3312 3100 59 9605-1-3312310059
52 Piston 1 3312 3118 63 9605-1-3312311863
53 Hexagonal nut, thick 2 3312 3106 97 9605-1-3312310697
54 Side bolt 2 3312 3118 64 9605-1-3312311864
55 Air tube 1 3312 3118 65 9605-1-3312311865
56 Water tube 1 3312 3118 66 9605-1-3312311866
57 Front head 1 3312 3118 87 9605-1-3312311887
58 Rotation sleeve 1 3312 3118 88 9605-1-3312311888
59 Rotation nut 1 3312 3101 35 9603-1-3312310135
60 Sleeve 2 3312 3118 81 9602-1-3312311881
61 Shaft 1 3312 3118 82 9602-1-3312311882
62 Shank sleeve 1 3312 3118 79 9602-1-3312311879
63 Steel retainer 1 3312 3118 80 9602-1-3312311880
64 Hoop 1 3312 3110 37 9605-1-3312311037
65 Partition wall 1 3312 3119 01
66 Bolt 3 3312 3119 02
67 Nut 3 3312 3112 92

NOTES NOTES

Atlas Copco Secoroc AB
Box 521, SE-737 25 Fagersta, Sweden
Phone: [phone]
E-mail: [email protected]
www.atlascopco.com
9852 3028 01 2012.06