Atlas Copco Secoroc FT Series Guide

Secoroc FT Series Pusher Leg
Secoroc FT160 Pusher leg
Operator's instructions / Spare parts list
Secoroc Rock Drilling Tools

Foreword
Thank you for selecting the Secoroc pusher leg FT160/170.
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.
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FT160A, FT160B, FT160C, FT170

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Table of Contents
Scope of application ................................................... 4
Specification ....................................................... 4
Safety instructions..................................................... 4
Operation ............................................................ 5
Attaching the pusher leg to the rock drill ................................ 5
Controls ........................................................... 5
Throttle lever.....................................................5
Feed control .....................................................6
Trigger..........................................................6
Drilling ............................................................ 7
Starting the rock drill ..............................................7
Stopping the rock drill .............................................7
Re-positioning the pusher leg ......................................7
Trouble shooting ...................................................... 8
Spare parts list and exploded drawing ................................... 10

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Scope of application
Secoroc FT series pusher legs are light weight, are easy to handle and to connect
and are powered directly from the rock drill. The pusher legs are available in
different lengths and with different extensions to achieve the required reach. They
also come with a variety of tube diameters for different feed forces to suit various
rock drills as well as different rock formations.
The FT160C and the FT170 have extra extensions for higher reach. The FT170
features an extra strong leg which provides additional feed force. The FT160B
features a powerful leg, designed for small drifting purposes.
Specification
Product
name
Weight
(kg)
Length
retracted
(mm)
Length
extended
(mm)
Feeding
length
(mm)
Piston
bore
(mm)
Suitable
rock drill
Article
number
FT160A 17 1668 3006 1338 65 7655, 7655D,
YT27, YT29A
3312 3006 08
FT160B 16 1428 2526 1098 65 7655, 7655D,
YT27, YT29A
3312 3006 09
FT160C 18 1820 3310 1490 65 7655, 7655D,
YT27, YT29A
3312 3006 10
Safety instructions
To reduce the risk of serious injury or death to yourself or others, carefully read
through this instruction booklet before putting the pusher leg 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.

FT160A, FT160B, FT160C, FT170
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Operation
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

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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.

FT160A, FT160B, FT160C, FT170
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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 lever 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 by means of the control lever so that the maximum
penetration rate is obtained.
Stopping the rock drill
Pull the throttle lever backwards, which will stop percussion, rotation and flushing
water.
Re-positioning the pusher leg
1. Switch off the rock-drill percussion and flushing by means of the throttle lever.
2. Press the trigger, whereupon the piston rod is pulled back into the pusher-leg
cylinder automatically.
3. Re-position the pusher leg.
4. Release the trigger, whereupon the piston rod will move outwards again.
5. Move the throttle lever forward into the working position.
Note!The feed control lever does not need to be touched throughout this operation.

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Trouble shooting
Low penetration rate may be caused by insufficient feed force from the pusher leg,
check the following points:
hIncrease the angle between pusher leg and drilling surface.
hRing in cross arm wears out; seals between cylinder and back head are worn out.
Replace defective seals.
hLoose connection between frame body and outer pipe; lose or defective seal pad
at the end of air tube and double YX seals, replace seals.
hTrigger on back head and change over valve are blocked, repair.

FT160A, FT160B, FT160C, FT170
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Spare parts list and exploded drawing