Atlas Copco Secoroc 7655 User manual

Secoroc 76 Series Rock Drill

Secoroc 7655/7655D Pusher Leg Rock Drill

Operator's instructions / Spare parts list

Secoroc Rock Drilling Tools

Foreword

Thank you for selecting the Secoroc pusher leg rock drill 7655/7655D.

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 the correct maintenance of the rock drill.

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 drill steel..................................... 7

Before fitting the drill steel .........................................7

Fitting the drill steel ...............................................8

Removing the drill steel............................................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

Checking the lubrication ..........................................11

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

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

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

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

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

Once a week (after 40 hours of operation) ............................12

Once a month (after 200 hours of operation)..........................12

Selection of spare parts ............................................. 13

Storage .......................................................... 13

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

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

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

Scope of application

Model 7655 is a highly efficient rock drill. It is mainly used in either rock drilling

work such as mining and tunneling, or in railway, water conservancy construction

projects and stone work. It is suitable for wet drilling on hard and medium hard

rock, or for drilling horizontal or inclined blast holes. 7655 can be equipped with

pusher leg FT160A and FY200A lubricator.

Model 7655D is a low energy consumption rock drill based on model 7655. It has

good performance at low air pressure, with long air lines or powered by small sized

air compressor. 7655D is mainly used in the same applications as the 7655. It can be

equipped with pusher leg FT160A and FY200A lubricator.

Specification

Pneumatic rock drills 7655 and 7655D

7655 7655D

Weight 24 24 kg

Dimension (L x W x H) 628 x 232 x 207 668 x 232 x 202 mm

Cylinder diameter 76 70 mm

Piston stroke 55 70 mm

Minimum working pressure 3 3 bar(e)

Impact energy (at 6.3 bar (e)) ≥65 ≥65 J

Impact energy (at 5.0 bar (e)) ≥59 ≥57 J

Impact energy (at 4.0 bar (e)) ≥42 ≥44 J

Air consumption (at 6.3 bar (e)) ≤80 ≤80 l/s

Air consumption (at 5.0 bar (e)) ≤54 ≤52 l/s

Air consumption (at 4.0 bar (e)) ≤50 ≤45 l/s

Impact frequency (at 6.3 bar (e)) ≥37 ≥32 Hz

Impact frequency (at 5.0 bar (e)) ≥36 ≥31 Hz

Impact frequency (at 4.0 bar (e)) ≥34 ≥30 Hz

Torque (at 6.3 bar (e)) ≥18 ≥18 Nm

Torque (at 5.0 bar (e)) ≥15 ≥15 Nm

Torque (at 4.0 bar (e)) ≥12 ≥12 Nm

Water pressure working pressure -1 working pressure -1 bar(e)

Air hose inner diameter 25 19 mm

Water hose inner diameter 13 13 mm

Drilling diameter 34–42 34–42 mm

Max drilling depth 5 5 m

Working temperature -30 to +50 -30 to +50 ºC

Shank size H22x108±1 H22x108±1 mm

Noise level ≤125 dB(A)

Lubricator FY200A

Weight 1.2 kg

Capacity 0.2 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 in this manual.

hAlways wear a safety helmet, impact resistant eye protection with side protection

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 drill steel 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.

hExposure to crystalline silica (sometimes called 'silica dust') as a result of drilling

in rock may cause silicosis, cancer or death. Never operate the rock drill without

water flushing.

hA compressed air hose that comes loose can lash around and cause personal

injury or death. Check that the compressed air conections are not damaged and

that they are properly attached.

Operation

Using the rock drill for the first time

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

heavy oil to prevent corrosion.

After unpacking and installing the machine, pour a small amount of lubrication

oil into the air connection and operate the machine 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 FY200A 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 drill steel 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 drill steel 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

A compressed air hose that comes loose can lash around and cause personal injury or

death. Check that the compressed air conections are not damaged and that they are

properly attached.

2. Blow out the air hose

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

dirt and moisture.

3. Check the lubrication oil level

hFill the lubricator with oil if necessary.

hAlways use a recommended lubricant.

Lubricant recommendation

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

machine.

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

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

Water pressure

Set the water preassure to around 3 bar. 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.

Air hose dimensions

The air hose diameter for model 7655 must be no less than 25 mm and no less than

19 mm for model 7655D. The inner diameter of connection nipples and hoses must

be no less than 19 mm. The ideal overall air hose length is less than 15m.

Water hose dimensions

The water hose inner diameter for model 7655 and 7655D must be no less than ½".

5. 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.

Do not pour methylated spirits or similar substances into the rock drill, as they will

interfere with the lubrication and lead to increased wear.

Fitting and removing the drill steel

Before fitting the drill steel

hCheck that the drill steel shank is of the correct size and length for the chuck

used.

hThe shank must be clean and the drill steel must be in good condition.

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

cause piston damage 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 drill steel.

hThe shank end face shall be flat and perpendicular to the axis.

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

premature piston failure.

hInspect the drill steel: A dull drill steel will slow down the drilling speed and

overstrain the drill mechanism. When changing drill steel make sure that the new

one is the correct size to follow your previous bore.

hBefore drilling check that the flushing hole in the drill steel is not blocked.

Fitting the drill steel

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 drill steel

collar.

2. Insert the drill in the chuck.

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

Removing the drill steel

1. Push the retainer outwards in the direction of the arrow until the drill steel

collar disengages from the front of the retainer.

2. Pull the drill steel 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 using the feed control lever.

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 using a screwdriver. Tighten the nut after regulation.

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. Too much

oil will have negative effects on the operation whilst too little will result in damage

to parts as the temperature rises during operation.

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.

This manual suits for next models

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