This manual is property of the owner. Leave it with the unit when set-up and start-up are complete. MEC reserves the right to change design and specification without prior notice.

MEC INTERNATIONAL

E-604, E.P.I.P.BORANADA JODHPUR, RAJASTHAN (INDIA) 342 012 Ph: +91 2931 281725 Fax: +91 2931 281525

EMAIL: - marketing@mecpl.com, sales@mecpl.com WEB: - www.mecpl.com

Throughout this manual, Statements indicating precautions necessary to avoid equipment failure are referenced in a Note Statements indicating potential hazards that could result in personal injury or property damage are referenced in a caution! Box

MEC INTERNATIONAL

INSTALLATION AND

OPERATION

MEC MOBILE CLOSED CIRCUIT BLASTING MACHINE, MODEL: MCB-X

SR.NO. MEC-I/0605

Instruction manual

CONTENTS

S. NO. DESCRIPTION PAGE NO.

1. FOREWORD 01

2. WELCOME 02

3. SAFETY MEASURES 03

4. WARNING 05

5. CAUTION 06

6. SAFETY PRECAUTIONS 07

7. SPECIFICATIONS 08

8. OPERATING PRINCIPLE 09

9. DUST COLLECTOR 12

10. DESCRIPTION OF CARTRIDGE DUST COLLECTOR 13

11. OPERATING PRINCIPLE OF DUST COLLECTOR 13

12. FILTER INSTALLATION 14

13. DUST COLLECTOR TROUBLE SHOOTING 15

14. AIR REQUIREMENT 16

15. OPERATING THE MACHINE 17

16. OPERATING TECHNIQUE 18

12. PRECAUTIONS 19

13. MAINTENANCE 20

14. MACHINE TROUBLESHOOTING 22

15. CHANGING THE MEDIA 24

16. PART LIST 25

Instruction manual

LIST OF DRAWINGS

01. MANUAL DRAWING MEC/3834-13

02. VACUUM PUMP ASSEMBLY MEC/3835-13

03. BLAST Y GUN ( BIG) MEC/3836-13

04. BLAST Y GUN ( SMALL) MEC/6837-13

05. PNEUMATIC CIRCUIT DRAWING MEC/6838-13

06. REMOTE CONTROL VALVE DRAWING MEC/5405-09

07. MIXING TUBE ASSEMBLY MEC/5403-09

08. EXHAUST VALVE DRAWING MEC/5789-11

09. DUMP VALVE DRAWING MEC/6133-12

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Instruction manual

FOREWORD

Every possible effort is taken in design and manufacture of Air Operated Grit Blasting

Machine MEC MOBILE CLOSED CIRCUIT BLASTING MACHINE, MODEL: MCB-X to

ensure so far as is reasonably practicable i.e. the equipment offered is safe and

without risk to health WHEN PRPOERLY USED. However, if the operating instructions

are ignored, it may prove to be hazardous and desired result may also be not

achievable, furthermore, in order to eliminate the risk of fast wear of

components/parts. Purchaser of the equipment should ensure that all operators and

maintenance personnel are fully acquainted with the relevant instruction manual and

in particular with Safety Precautions, when using impact finishing equipment.

After getting conversant, the user will not normally encounter the difficulty in the

operation of the MODEL: MCB-X. In case of any special problems, however, you are

welcome to refer those to the manufacturer M/s MEC INTERNATIONAL, JODHPUR,

INDIA who will be too glad to help/ solve the problem in the least possible time.

USE EYEBOLT / LIFTING HOOK FOR LOADING / UNLOADING THE MACHINE

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Instruction manual

WELCOME

MEC INTERNATIONAL welcomes you to the family of our product users.

We thank you for choosing our product. We at MEC INTERNATIONAL extend a very

hearty welcome to the MEC club and assure you of our best services for optimum

utilization of our product and services. MEC family congratulates you for the choice of

the machine. Thank you for the confidence reposed on us and we assure you our

best services.

We are honored by your choice and are proud of our association. The journey of

thousand miles will have to start with the first step. We have taken the first right step

together in the journey of our business.

Welcoming you once again to club and wishing you all the best.

MEC FAMILY

3

Instruction manual

SAFETY MEASURES

GRAPHIC SYMBOL DEFINITIONS

This manual uses a system of graphic symbols to alert the user to the presence of important

operating instructions, safety consideration, and special instructions. These symbols (along

with their definitions) are show below:

Additional information of general importance is provided.

Special instructions, safety instructions, etc. are being presented.

Information, instructions, and restrictions necessary to prevent

personal injury or damage to equipment are being presented.

Explosive material is present.

Inflammable material or high temperature is present.

Respiratory equipment must be worn.

Danger : risk of electric shock.

Toxic material present.

Ear protection must be worn.

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Instruction manual

Eye protection must be worn.

Face protection must be worn.

Safety gloves must be worn.

Safety overalls must be worn.

Keep hands, hair, clothing and tools away from moving

parts.

Magnetic fields from high currents can affect pacemaker

operation. Persons wearing electronic life support

equipment (pacemaker) should consult with their doctor

before going near spray equipment

Radiation present

5

Instruction manual

WARNING

ELECTRIC SHOCK CAN KILL.

DO NOT TOUCH LIVE ELECTRICAL PARTS.

BLAST HOSE SHOULD NOT HAVE SHARP BENDS AT MIXING TUBE (20) OUTLET OR GUN INLET.

KEEP AWAY FROM MOVING PINCH POINTS SUCH AS SLIDING CLAMP DOORS PARTS.

KEEP 8 TO 10 MM OF GAP BETWEEN AIR AND ABRASIVE NIPPLE OF MIXING TUBE (MEC/5403-09).

TROUBLE SHOOTING TO BE PERFORMED ONLY BY QUALIFIED PERSONS.

PROTECT YOUR SELF FROM BLAST & DUST.

DO NOT CLEAN CATRIDGES WITH DIRECT AIR JET.

ALWAYS ASCERTAIN THAT BLAST Y GUN (01) & BLAST HOSE (02) IS CLEANED (THREADED AREA) BEFORE IT IS RE-ASSEMBLED WITH NOZZLE.

USE MANUFACTURS SUPPLIED GENUINE SPARE PARTS ONLY FOR REPAIR AND MAINTENANCE.

CLEAN MACHINE SURROUNDING AFTER EVERY SHIFT OF DAILY WORKING.

IF TWIST-ON TYPE AIR HOSE COUPLING ARE USED, THEY MUST BE SECURED TO PREVENT ACCIDENTAL DISCONNECTION WHILE UNDER PRESSURE COULD CAUSE

SERIOUS INJURY.

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Instruction manual

CAUTION

All doors must be closed when the unit is ON. Never blast with open doors of the

reclaimer or dust collector.

Never point the blasting nozzle towards anyone directly.

Always Start vacuum pump before starting blasting.

After blasting, do not lift the gun, or switch off vacuum pump until whole of the media and dust is sucked.

Do not open the dust bin while the vacuum pump is ON. The dust bin chamber is under negative pressure when the pump is ON. Opening the dust door will allow dust to

escape.

Do not use sharp instruments to force the filter in the dust collector. This could damage the filter or rubber seal and seriously impair the function of the dust collector.

Install one cartridge at a time. Check the seating of the top & bottom rubber seals, before proceeding to the fitment of remaining cartridges.

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Instruction manual

SAFETY PRECAUTIONS

All operators coming into contact with the machine should read and understand the entire

contents of this manual, before installing, operating or maintaining this equipment. Do not

allow untrained persons to install, operate, or maintain this unit.

Disconnect input power / compressed air supply before installing or servicing this equipment. Turn off all supplies when not in use. Compressed air Quality should be -10

Deg at Dew point 1600 PPM & 5 mg/Cub. Metre oil particles for breathing air during

blasting should not be more than 1600 PPM & 5 mg/Cub. Metre.

Properly install and ground this equipment according to these manual and national, state or local codes.

Use only recommended cables. Do not use worn / damaged parts, undersized, or poorly spliced cables. Use only well maintained equipment. Repair or replace damaged parts at

once.

Keep all doors and covers securely in place. Never operate the equipment with the doors or drain caps or dust bin removed.

Never look into the stream of the blast or in the nozzle without first ensuring that the blasting switch / lever are in the OFF position.

Do not breathe the dust. Always provide efficient ventilation and the best possible dust collection system for the materials to be handled. In case of any doubt, an advice may be

sought from the manufacturer.

Wear recommended safety wears whenever required.

Use only recommended earplugs or earmuffs if noise level is high.

Do not point nozzle or gun towards any part of the body, other people, or any other object or combustible while blasting.

Use manufacturers supplied genuine spare parts only for repair and maintenance. Warranty is void if the instruction is not followed.

Periodic check-up of pressure vessel/blast generator recommended as per Factory Act and other industrial norms.

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Instruction manual

SPECIFICATIONS

i. OVERALL DIMENSION L x B x H (MM) - 3520 X 1600 X 4850

ii. BLAST GENERATOR CAPACITY - 12 CFT

iii. CLOSED CIRCUIT BLAST GUN NOZZLE ORIFICE - 8 MM SUPERSONIC WC LINED

BLAST HOSE INNER DIA - 25 MM

BLAST HOSE LENGTH - 16 MTR.

QUANTITY - 01

iv. RECOVERY SYSTEM VACUUM PUMP MOTOR - 25 HP, TEFC, 220V/3P/60 HZ

CAPACITY - 400 CFM AT 10 Hg (APPROX)

v. DUST COLLECTOR TYPE - CARTRIDGE TYPE

CLEANING - THROUGH PULSE JET

NO. OF CARTRIDGE - 06 NOs.

vi. VIBRATORY SIEVE DRIVE - PNEUMATIC

SIEVE SIZE - 08 MESH

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Instruction manual

OPERATING PRINCIPLE

The blasting is accomplished by holding the gun against the work surface. The equipment

being closed circuit, the spent abrasive is sucked due to vacuum created and cycled into

pressure generator after passing through the reclaimer unit. Thus the used abrasive and dust

created is contained within the equipment, keeping the blasting operation dust free.

When the air supply is on, and electrical power is connected, the blast machine is ready for

actuation.

The Abrasive Blasting machine operates with a regular supply of compressed air at Air Inlet

connection for blasting purpose, which is divided in two parts. A part of compressed air is to

pressurize the Blast Generator when Dump Valve seals against rubber O Ring and Exhaust

Valve closes the exhaust port of the blast Generator. Another part of the compressed air is

used to propel the abrasive from the Blast Generator through the Mixing Tube to the Blast

Nozzle ,Where abrasive falling in it from the blast generator through the Mixing Tube is picked

up and propelled on.

The air abrasive mixture passes through the Blast hose and finally issues out of the Blast

Nozzle & Gun Head at a high velocity to strike the work surface. The sharp abrasive particles

rapture or scratch out the unwanted material or coating on the work surface.

During operation the abrasive metering valve, meters a controlled quantity of abrasive

into the air stream, the air and abrasive travels through the blast hose to the blast gun.

Blasting is contained entirely within the hand held gun assembly. A brush at the end of the

assembly confines the abrasive and draws in atmospheric air, sweeping the blast area clean.

Spent abrasive and by-products are conveyed from the blast surface to the reclaimer.

At the reclaimer, the reusable abrasive material drops out of suspension due to the cyclonic

action, passes through a screen and collects in a hopper located above the blast generator.

Air, dust and fine by-products leave the reclaimer and are drawn through the dust collector. Dust collects in the cartridge filter, and the cleaned air passes through the vacuum

pump and is discharged into the atmosphere. Dust particles trapped by the filter cartridge are

removed by automatic air purging mechanism; dust released from the cartridge collects in a

pan for disposal.

When the operator releases the control switch, stopping the blast action, the blast machine

depressurizes, and automatically refills with abrasive collected in the reclaimer hopper.

Vacuum is created by Vacuum Pump to suck the abrasive and debris after blasting and also

separate the abrasive and dust. The spreading of abrasive is prevented by Nylon Brush

retained in the Rubber Retainer; the Vacuum Pump is driven by an Electrical Motor.

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Instruction manual

The Remote Control Valve installed on the machine serves important purposes. Its main

function is that it puts the operation of the machine in the hand of the operator, holding the

blast nozzle. It functions in combinations with a Blast Control Valve connected to the Remote

Control Valve through a Twin Hose.

GUN HEAD, BLAST NOZZLE & HOSES

It consists of an Outer Housing, which together with the Brush retains the abrasive and dust

during blasting. Abrasive enters from the Blast Hose through the Supersonic Nozzle and

issues out of the Inner Cone to strike the surface being cleaned. The inner cone separates

the abrasive stream blasting the work surface and the reclaiming air stream being drawn into

the gun through the brush by the vacuum towards the Return Hose. The feed of abrasive to

the blast nozzle is through blast hose which is connected to the Mixing Tube beneath the

Blast Generator. The abrasive and debris return to the Reclaimer through the Flexible Hose.

The Hoses connect the control system on the machine to the Blast Control Valve at the gun.

BLAST GENERATOR

It contains an abrasive and during the operation of the machine it remains pressurized. The

compressed air pressurizes the blast generator as well as Dump Valve. Thus the dump valve

closes automatically and the blast generator is pressurized. When the machine is switched

OFF, the dump valve falls down opening the way for the abrasive to be transferred from the

storage hopper to the blast generator. The Mixing Tube, which is attached to the blast

generator, is fitted with an orifice, which meters the quantity of the abrasive fed to the gun via

the air stream.

VACUUM PUMP

The vacuum pump is positive displacement type and powered by 15HP Electric Motor by

means of V- Belt Drive. The control is by means of an Automatic Star Delta Starter. A Relief

Valve fitted in the inlet side of the pump, controls the max. Vacuum created by the unit. The

valve is set to relieve at a pump inlet depression of 300 mm Hg.

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Instruction manual

RECLAIMER

It separates the dust from reusable abrasive by cyclone action with an adjustable air wash. A

pneumatically operated vibratory screen is provided which removes oversized particles and

debris from the abrasive before entering into the storage tank for recycling. The inlet is

coated with Tungsten Carbide by thermal spray process for high wear life.

VACUUM RELIEF VALVES

A vacuum relief valve limits the amount of vacuum pulled by the pump by allowing small

amounts of air into the system whenever the valve's set point is exceeded. It does not close

down the system.

The valve is adjusted so the pump pulls just the vacuum required by the application. This is

desirable because operation at higher than necessary vacuums produces higher tem-

peratures and greater workloads on the pump, thus reducing service life. It is especially

important to use a vacuum relief valve with light-duty pumps.

RECOVERY SYSTEM

Recovery adopted by negative pressure created by an electric motor driven type vacuum

pump and capable of suction from 25 mtr. distance.

PINCH VALVE (MANUAL)

Manual pinch valve is used to shut the supply of shot/grit in the machine, during the repairing

or replacement mixing tube it prevent the media to come out from the pressure vessel, also it

can be used to control the media flow rate though not in a precise way.

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Instruction manual

DUST COLLECTOR

After passing through the reclaimer, the finally broken down abrasive and dust is drawn into

the dust collector inlet box. The dust is deposited on the surface of the filter elements and

thus clean air is discharged into the atmosphere. The filter elements are automatically

cleaned with the aid of high pressure reverse air jet (pulse jet), operated sequentially through

a timer, electrical circuitry and solenoid valves.

CARTRIDGE DUST COLLECTOR

DO NOT allow sparks, cigarettes or other burning objects to enter the duct of any dust control equipment as these may initiate a fire or explosion. For optimum collector

performance, use only MEC replacement parts.

WARNING - Improper operation of a dust control system may contribute to conditions in the

work area or facility that could result in severe personal injury and product or

property damage. Check that all collection equipment is properly selected and sized

for the intended use.

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Instruction manual

DESCRIPTION OF CARTRIDGE DUST COLLECTOR

Dust laden air is drawn into dust collector through inlet due to suction created by vacuum

pump and passes through cartridge elements. The abrasive resistant inlet promotes dropping

out high particulate, generates uniform air flow, thus increases filter life. The dust gets

deposited on outer surface of cartridge and clean air flows through the center passage of

cartridge into clean air plenum. Clean air further exit into atmosphere through outlet duct.

filter cartridge are periodically and automatically get cleaned through air purging. Sequence

circuit activates solenoid valves for high pressure air purging of preselected cartridge filter.

Dust released from filter slides downward into the hopper for further collection into the dust

bin

OPERATING PRINCIPLE OF CARTRIDGE DUST COLLECTOR

During normal operation, dust-laden air enters the unit through the dirty-air inlet. Airflow is

directed through the collector and heavier particulate falls directly into the hopper. The filter

cartridge removes the fine particulate and clean, filtered air passes through the filter to the

clean-air plenum and discharges through the clean air outlet.

Filter cleaning is completed using pulse-jet technology. A solenoid and diaphragm valve

aligned to each row of filters provides the pulse cleaning. Remove, inspect, or change the

cartridges from the unit by removing the filter access door of dust collector, remove the

bottom plates and take the filters out.

PRELIMINARY START-UP CHECK

1. Check for and remove all loose items in or near the inlet and outlet of the unit. 2. Check that all optional accessories are installed properly and secured. 3. Check that hopper discharge is not open and the storage container is sealed, if

equipped. Excess airflow to the pump will cause electrical failure.

4. Turn the pump motor ON then OFF to check for proper rotation by referencing the rotation arrow located on the motors mounting plate.

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Instruction manual

FILTER INSTALLATION

1. Open the access door of dust collector. 2. Remove the knob and plate at the bottom of filter and Pull the old filter out. 3. Collect new filters as per part list. 4. Insert the new filter in the specific hole keeping the open mouth of the filter in upward

direction.

5. Place the bottom plate and tight it with aluminum knob to make it air tight 6. Close the access door.

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Instruction manual

TROUBLE SHOOTING OF CARTRIDGE TYPE DUST COLLECTOR

Problem Probable Cause Remedy

motor do not start

Improper motor wire

size

Rewire using the correct wire gauge as

specified by nation all and local codes.

Not wired correctly Check and correct motor wiring for

supply voltage. See motor

manufacturers wiring diagram. Follow

wiring diagram and the national electric

codes

Unit not wired for

available voltage

Correct wiring for proper supply voltage

Input circuit down Check power supply to motor circuit on

all leads

motor starts, but do not

stay running

Incorrect motor- starter

installed

Check for proper motor starter and

replace if necessary

Dust collector Hopper

discharge open

Close the cover of dust bin

Electrical circuit

overload

Check that the power supply circuit has

sufficient power to run all equipment

Clean-air outlet

discharging dust

Filter cartridge not

installed correctly

Install filter correctly and make it air

tight

Filter get damage, dents in

the end caps, gasket

damage or holes in pleated

media

Replace filters as necessary. Use only

genuine MEC replacement parts.

Insufficient air flow

Motor rotates

backwards

Check the rotation as mentioned on

vacuum pump.

Access doors open or

not closed tight

Check that all access doors are in

place and secured. Check that the

hopper discharge opening is sealed

and that optional attachments are

installed correctly.

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Instruction manual

Insufficient air flow

pump exhaust area

restricted

Check pump exhaust area for

abstractions. Remove material or debris

if any .

Filter cartridge need

replacement

Remove and replace using genuine

replacement filters.

Pulse cleaning not

energized

Use a voltmeter to check supply voltage

to the timer board. Check and replace

the fuse on the timer board if

necessary.

Pulse valves leaking

compressed air

Lock out all electrical power to the unit

and bleed the compressed air supply.

Check for debris, valve wear.

AIR REQUIREMENTS:

Air consumption depends mainly upon the orifice and pre-pressure. It also depends whether

it is flowing free through the nozzle or carrying abrasive. The following table gives the

consumption of air, carrying abrasives, through orifices of various sizes and at various

pressures.

Nozzle Orifice

(mm)

Air Consumption in Cubic Meters/sec (Cfm)

Nozzle Pressure Kg/cm sq. (psig)

4.22 (50) 5.63 (80) 7.03 (100)

4.0 0.012 (25) 0.014 (30) 0.017 (37)

5.0 0.014 (30) 0.018 (38) 0.021 (45)

6.0 0.025 (54) 0.032 (68) 0.038 (81)

8.0 0.041 (89) 0.053 (113) 0.064 (137)

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Instruction manual

OPERATING THE MACHINE

CAUTION All parts to be blasted must be free of oil, water, and other contaminants. If not clean,

the abrasive may contaminate the blast surface, and may clog abrasive, resulting in

equipment malfunction.

Operators must wear operator safety equipment.

Heavy gloves and clothing will help prevent serious injury from the abrasive blast if the closed brushes are accidentally lifted off the surface.

The machine is ready for operation when compressed air and electrical power are supplied to the machine with abrasive loaded.

Half open the Abrasive Regulating Valve( pinch valve ).

Start the vacuum pump by push button located on the electrical panel.

Connect the compressed air line and start the air flow by opening the Main Air Valve. Regulate the air by Air Regulator.

Switch ON the Vacuum Pump and open the brass cock to Air Vibrator.

Suck the abrasive through the gun, if not loaded already. Don`t forget to start vibrator.

When ready to blast hold the blast head brushes against the surface to be blasted, depress the finger switch, blasting (air only at this time) will begin within a couple of

seconds. Adjust the abrasive flow by Abrasive Regulating Valve to get an optimum

ratio of abrasive and air, according to the requirement

Leave the brush against the surface for several seconds after blasting stops, to ensure that all abrasive is recovered from the surface.

To stop blasting, release the pressure on the finger switch. Leave the brush against the

surface for several seconds after blasting stops, to ensure that all abrasive is recovered from

the surface.

Close the Blast Control Valve keeping the gun on the work surface. Hold the gun on the work surface for about 10 seconds to allow the pressure in the

machine to subside.

Turn off the main air valve. Turn off the Valve. Switch OFF the vacuum pump. Disconnect the compressed air supply, if the machine is to remain idle for a longer

period.

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Instruction manual

When the machine has run for the sometime, the abrasive in the blast generator gets

exhausted and gets collected in the Reclaimer Storage Hopper. When the blast generator thus

gets emptied only air flows through the supersonic nozzle, switch OFF the gun by closing the

Valve , which will open the exhaust and close the inlet part of Remote Control Valve.

Wait for about 30 seconds during which time the abrasive is transferred back to the

blast generator. After that the blasting can be started again.

OPERATING TECHNIQUE

To achieve full abrasive and dust recovery the brush must be in contact with the surface at all times.

Keep the brush flat against the surface. Keep the blasting head perpendicular to the surface.

Do not apply excessive pressure that would cause the brush to bend into the blast stream.

Make straight, even passes over the blast surface. The blast pattern should barely overlap the pattern from the previous pass. When reversing direction, move the gun and brush in a small radius, allowing the brush

bristles to roll evenly.

SHUT-DOWN

After blasting is complete, run the vacuum pump for several seconds to clear the hoses.

When shutting down for the day, empty the machine of abrasive. Close the compressed-air supply valve. Drain receiver tank, filters, and water collecting devices, and bleed the compressed-

air supply hose.

Shutdown the compressor.

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Instruction manual

PRECAUTIONS

1. Always use dry and sieved material for blasting operation.

2. Always use dry & oil free and cleaned compressed air, clean or change the Air Filter element with clean petrol & bowl with water if it is not functioning properly.

3. Check that the operating air pressure is adequate and does not fluctuate during blasting operation.

4. Keep the door of dust collector closed securely.

5. In the event of any malfunctioning of the machine or obstruction in the nozzle, the blast generator must be de-pressurized before any inspection or rectification.

6. Empty the blast generator at the end of the working day or when the machine is expected to remain idle for a long period. This can be done by removing the drain plug

taking out the grit.

7. ROTATE THE ABRASIVE HOSE AND BLAST NOZZLE BY 90 DEGREE AFTER EVERY 40 HOURS OF THE WORKING TO HAVE UNIFORM WEAR.

8. GAP BETWEEN ABRASIVE NIPPLE AND AIR NIPPLE IN THE MIXING TUBE SHOULD BE MAINTAINED BETWEEN 8 TO 10 MM.

9. CHECK O RING AGINST ANY WEAR. IF WORN OUT MUST BE REPLACED.

10. ALWAYS ASCERTAIN THAT Y GUN AND BLAST HOSE IS CLEANED BEFORE IT IS RE-ASSEMBLED WITH NOZZLE.

11. Do not try to open the doors of the abrasive storage tank, dust collector when the vacuum pump is running.

12. Motor should have good ventilation.

13. Provide overload protection devices for possible safety.

14. Make certain that the power supply is disconnected before attempting to service or remove any components.

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Instruction manual

MAINTANANCE

DAILY ROUTINE MAINTENANCE

1. Abrasive Storage Tank must be emptied by draining off the abrasive from it at the end of each working day. Keeping the Media in the machine overnight may cause

coagulation of the grits (especially at the high humidity areas), which may cause

choking of the media passage (Hose, Nozzles, etc).

2. Remove debris from the vibrating Screen.

3. Check the air line and pipe fitting of the machine against any leakage of air. Repair or replace the leakage part.

4. Clean out the dust collected in the dust bin (1.15) of Dust collector (1.10) from time to time.

5. Clean the cartridges (1.12) after every shift without blasting operation by starting dust collector.

WEEKLY ROUTINE MAINTENANCE

1. Carryout daily routine maintenance.

2. Check the Nozzles and the Abrasive Hoses for wear. Replace the Nozzle if the bore size has increased by 25% of the normal size.

3. The hose connector must be checked regularly for signs of wear and the couplings must be checked for any air leaks.

MONTHLY ROUTINE MAINTENANCE

1. Carryout weekly routine maintenance.

2. Check the Vibratory Sieve for choking and any damage

3. Electric Motor Bearings are lubricated for life. If any abnormal noise is observed, bearing shall be replaced.

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Instruction manual

HALF YEARLY ROUTINE MAINTENANCE

1. Carryout Monthly routine maintenance.

2. Check Mixing Tube (1.21) against wear. Replace if required.

3. Check Blasting nozzle for any wear.

4. Check & service Solenoid Valves.

5. The maintenance of blast generator (1.3) for most of the parts depends on the compressed air condition.

6. Inside the Blast generator (1.3) is the Dump Valve (1.28) inspect this regularly through the inspection hole for any wear and tear.

7. The blast generator (1.3) de-pressurized by Exhaust Valve. The Rubber Diaphragm of the Exhaust Valve can wear out due to repeat pressurize & de-pressurize action of

the blast generator (1.3) and must be replaced every three months.

YEARLY ROUTINE MAINTENANCE

1. Carryout Half yearly routine maintenance.

2. Cartridge Filter should be checked for tear & replaced whenever it is required.

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Instruction manual

MACHINE TROUBLE SHOOTING

FAULT : Low Air Pressure

CAUSE:

1. Low pressure in the compressor.

2. The bore of air supply line to machine is too small.

3. Filter element of the Air Filter is blocked. 4. Air Regulator is malfunctioning. 5. Air Supply from the same line to the

other pneumatic tools in operation.

6. Nozzle size is too large. 7. Excessive wear of Nozzle bore. 8. Excessive abrasive in the air abrasive

system.

9. Dump Valve is leaking.

10. Air leakage from the Blast Generator.

11. Leakage in the blast hose because of excessive wear.

REMEDY:

1. Stop the machine and allow the pressure to build up in compressor.

2. Use air supply line of proper size (Refer standard machine specification sheet).

3. If necessary replace it. 4. Repair the fault in air regulator. 5. Avoid air supply to other pneumatic tools

from the same air line.

6. Use matching size of the nozzle. 7. Replace the nozzle. 8. Set the proper abrasive ration by abrasive

control valve.

9. a. Correctly fix the seating of valve. b. Replace O ring seal.

c. Replace Dump Valve Dome.

10. a. Tighten the joints. b. Replace the gasket.

c. Replace the part allowing leakage.

11. Replace the blast hose.

FAULT : No Flow of Abrasive from Nozzle

CAUSE:

1. Obstruction in the Nozzle.

2. Obstruction of clogging of abrasive in the Mixing Tube.

3. Blast Generator is not pressurized due to leakage at Dump Valve sealing or at some

other place in the tank.

4. Screen in vibratory sieve may be choked.

REMEDY:

1. Disconnect the compressed air supply to the machine and open the Exhaust valve.

Take out the nozzle, clean it and screw it

back in the holder.

2. Open the mixing tube and remove obstruction or clogged abrasive from it.

3. a. Replace the O Ring Seal. b. Check the blast generator and repair

the leakage.

4. Remove, clean & re-fit the screen by

hand. Used sieved abrasive.

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Instruction manual

FAULT : Irregular Flow of Abrasive

CAUSE:

1. Excessive air in the abrasive system.

2. Excessive wear of nozzles. 3. Air Supply is insufficient

4. Clogged abrasive in the Nozzle or in the Blast Hose.

REMEDY:

1. Check whether media is present in the vessel. Or check for mixing tube hole

blockage

2. Replace the Nozzle. 3. Check the pressure gauge and increase

the air supply

4. Remove, clean & re-fit the nozzle.

FAULT : Uncontrolled and Excessive Flow of Abrasive

CAUSE:

1. Excessive wear of Mixing Tube.

2. Improper air to abrasive ration.

REMEDY:

1. Replace the Mixing Tube / Nipples.

2. Check the size of hole of mixing tube.

.

FAULT : Electric Motor does not Rotate

CAUSE:

1. Interruption of service.

2. Bad contact of switch.

3. Load is too heavy.

5. Bad contact of switch.

REMEDY:

1. Check motor terminal voltage or source

voltage.

2. Check motor terminal current, repair

defect of connection.

3. Lower load to rated, or raise capacity by

changing unit.

5. Repair or otherwise replace the switch.

FAULT : Electric Motor Over heat

CAUSE:

1. Voltage is too high or too low.

2. Imbalance of voltage.

3. Short circuit of motor winging.

4. Shortage of lubricant and damage in

bearing.

REMEDY:

1. Check voltage and repair.

2. Check, source of circuit & wiring.

3. Check winging and repair.

4. Replace bearing and replace lubricant.

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Instruction manual

CHANGING THE MEDIA

Prolonged use of shots/Grits causes their break down into finer sizes, reducing blasting

effectiveness. This contaminates the grit and adversely affects the quality of the blasted

surface. In such cases it is necessary to change the grit, in the following manner.

(i) Open the drain plug and take out the grits lying in the blast generator. Replace the drain plug after draining out all the grit. Ensure that the drain cock is correctly secured.

(ii) Charge new sieved grit of proper size through the blast Y gun as per machines storage capacity. (Grit gets further sieved through the screen before finally falling in

the blast generator).

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Instruction manual

PARTS LIST ( AS PER DRG. NO :-MEC/6834-13)

Part No. PART DESCRIPTION PART CODE

1.1 BLAST Y GUN ASSEMBLY

1.1 A FOR MCB-X (BIG GUN ) 39060009

1.1 B FOR MCB-V ( SMALL GUN) 39060007

1.2 BLAST HOSE 32000025

1.3 BLAST GENERATOR 12 CFT. -------

1.4 INSPECTION WINDOW -------

1.5 DUMP VALVE 33090125

1.6 STORAGE TANK 12.5 CFT. -------

1.7 ACCESS DOOR -------

1.8 VIBRATORY SCREEN 27052002

PNEUMATIC VIBRATOR (NOT SHOWN IN DRAWING) 22000115

1.9 VACUUM HOSE 2" ID 32040124

1.10 VACUUM HOSE 3 ID 32040125

1.11 RECLAIMER -------

1.12 DUST COLLECTOR -------

1.13 VACUUM RELIEF VALVE -------

1.14 FILTER CARTRIDGE 30030001

1.15 AIR PLENNUM FOR PURGING -------

1.16 AIR INJECTOR -------

1.17 VENTURI -------

1.18 DUST COLLECTOR MAINTANANCE DOOR -------

1.19 TOGGLE CLAMP 39000377

1.20 SS DUST BIN 39000261

1.21 VACUUM PUMP 47030000

1.22 ELECTRIC MOTOR 25 HP 24000424

1.23 CASTOR WHEEL 400 MM DIA SWIVEL TYPE 50090400

1.24 CASTOR WHEEL FIXED TYPE 50090401

1.25 PINCH VALVE 59017101

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Instruction manual

1.26 PINCH VALVE SLEEVE

1.27 MIXING TUBE 33090125

1.28 EXHAUST SILENCER HORIZONTAL -------

1.29 EXHAUST SILENCER VERTICAL -------

1.30 5 FLEXIBLE HOSE 32050125

1.31 6 FLEXIBLE HOSE 32050150

1.32 4 FLEXIBLE HOSE 32050100

PARTS LIST ( AS PER DRG. NO :-MEC/6835-13)

Part No. PART DESCRIPTION PART CODE

1.33 MOTOR PULLEY 39000402

1.34 PUMP SIDE PULLEY 39000402

1.35 V- BELT 50002054

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COVER 605INDEX 605MANUAL 605 final rev1