manual - M&L Testing Equipment
Contents
1. 4 DISCONNECT AND LOCK OUT ELECTRIC POWER Remove and set aside trays and pan Remove all case covers Drive Belt Checktension by pressing onthe span ofthe belt If properly adjusted the belt should be deflected 1 64th of the value of the distance between the pulleys To adjust or remove loosen the motor mounting bolts 61 and the motor will slide up loosening the belt tension Page 5 Gilson Company Inc PS 3 PS 4 Porta S creen a To adjust move the motor up or down until the belt tension is correct Retighten the nuts b Orremovetheloosened beltifitis worn and install anew one Obtain the correct tension by moving the motor up or down Retighten the nuts c Continue or reassemble 5 Timing Belt Check tension by pressing on the span of the belt The belt should be tight To adjust or remove the timing belt loosen the two idler bracket mounting screws 45 Loosen the nut on the adjusting screw 46 a To tighten Turninthe adjusting screw to pull the bracket 17 down and in crease tension on the belt Re tighten the nutto hold the bracket in position Reassemble b To replace Loosen the adjusting screw to per mit the idler bracket to move up ward loosening the tension on the timing belt so that you can remove it Before reinstalling belt 1 Rotate drive shaft 20 until the connect ing rod 50 is at its highest position 2 Rotate counterweight shafts 12 13 until co2. of the Porta Screen you may insert the required trays in the upper slots with the pan immediately below Then fill the lower slots with extra trays Clamp the trays by rotating the clamp levers so that they point down Pour your sample into the top tray Refer to the sample capacity information and be sure notto overload the Porta Screen erly wired grounded receptacle with appropri ate electrical current Set and activate the timer When the machine stops unclamp the trays by rotating the clamp levers so they point up Remove and empty the trays following the directions in your test specifications When you have finished your test unplug the machine Do not reconnect power until you are ready to use the machine again Store clean empty trays in the unit leaving them unclamped 10 Re level the machine before the next use Page 3 Gilson Company Inc PS 3 PS 4 Porta Screen lll Sample Capacity Capacity of the Porta Screen depends on the specifications of the test and the type and size of the material being tested For any given sample the Porta Screen s maximum capacity is determined by the tray which has the largest load at the end of the test This is the limiting tray Coarse Aggregates With coarse series trays 2 to No 4 the Minimum quantity of sample is usually es tablished by the specifications of the test procedure Forexample ASTM C 136 Speci fication for the Sieve o
3. GILSON COMPANY INC Laboratory Equipment for PARTICLE SIZE ANALYSIS CONSTRUCTION MATERIALS TESTING SAMPLING SOIL ENVIRONMENTAL TESTING Gilson Porta Screen Models PS 3 PS 4 Operating and Service Manual Copyright 1999 PHONE 800 444 1508 P O Box 200 Lewis Center Ohio 43035 0200 FAX 800 255 5314 740 548 7298 Website www globalgilson com 740 548 5314 MKW 7 99 SAFETY INSTRUCTIONS GILSON PORTA SCREEN WHETHER YOU ARE THE OWNER EMPLOYER OPERATOR OR MAINTENANCE PERSON FOR THIS MACHINE SAFETY IS YOUR RESPONSIBILITY YOU ARE RESPONSIBLE FOR OPERATING AND MAINTAINING THIS EQUIPMENT IN COMPLIANCE WITH THESE INSTRUCTIONS AND FOR USING COMMON SENSE YOU SHOULD ALWAYS REVIEW AND COMPLETELY UNDERSTAND THESE SAFETY AND OPERATING INSTRUCTIONS BEFORE USING THIS MACHINE A DANGER This machine operates on electrical current Improper use could result in electric shock electrocution injury by explosion or even death Always make sure the motor and electrical components are appropriate and properly configured for your intended use and available power source Porta Screens are normally wired for 115 volts 60Hz and come with a 1 4 hp non explosion proof motor ll Always check electrical wiring for loose connections and for pinched or frayed wiring II Always ground the Porta Screen Connectits three pronged plug to a properly wired three pronged grounded receptacle with appropriate electrical curre
4. NG THIS EQUIPMENT IN COMPLIANCE WITH THESE INSTRUCTIONS AND FOR USING COMMON SENSE YOU SHOULD ALWAYS REVIEW AND COMPLETELY UNDERSTAND THESE SAFETY AND OPERATING INSTRUCTIONS BEFORE USING THIS MACHINE Waming Operate only in a properly ventilated Waming Keep all parts of your body away area from moving parts of the machine i hile it is operating Waming LevelthePorta Screen beforeoperation WALSE Op g Waming Donotwearlooseclothing which might be caught in moving parts of the machine Waming Stop the Porta Screen if excessive vibrationormachinemovementoccurs Waming Always take care not to pinch your Warning Wear safety glasses protective fingers between the clamp levers and the machine frame Waming Donotoperatewithoutall guards and covers in place clothing and hearing protection Wear approved NIOSH MSHA respirator as required bythesampleto preventyour inhaling any dust which may be considered hazardous Procedure Read and be sure you understand all safety operating and timer instructions as well as specifications and procedures for your test 1 Check to see that the Porta S creen is level 5 Connect the three pronged plug into a prop 2 Select and load the appropriate trays Fill all the slots five trays and pan for the PS 3 seven trays and pan for the PS 4 The Porta Screen will notclamp or operate prop erly unless fully loaded with trays If your test requires fewer trays than the capacity
5. al ity bearing grease c Proceed to shaft bearing lubrication Shaft Bearings There are two bearings 47 frontand rear on the drive shaft 20 and two bearings 41 frontand rear on each of thetwo counterweight shafts 12 13 Some Porta Screens have sealed shaft bearings others have shaft bearings with grease fittings If the shaft bearings on your machinehavegreasefittings lubricate the bearings after every 80 to 100 hours of operation a WITH ELECTRIC POWER DISCONNECTED AND LOCKED OUT and trays pan and up 7 Belts per case cover removed remove lower front and rear case covers b Apply a small amount of any good qual ity bearing grease c Reassemble in reverse order Motor Bearings Lubricate annually a Remove trays pan and upper case cover b Remove lower front and rear case covers c Find and remove the oil plugs at each end of the motor d Insert a few drops of oil e Replace plugs f Reassemble in reverse order Idler Pulley Bearings These sealed bearings 62 do not require lubrication The Drive Belt 22 should fit snugly If the belt is too tight it will soon wear out causing bearings to wear and resulting in noisy opera tion A loose belt may cause the unit to run too slowly or to slip Keep the drive pulley 21 and motor pulley 60 aligned so that the drive belt is straight The Timing Belt 16 should fit tightly Access to Belts 1 2 3
6. as ordered Release clamping pressure on the Porta Screen trays by rotating the clamp levers outward and upward 180 Remove trays by sliding them out the front of the machine 7 10 Choose your operating site A The Porta Screen requires a properly wired three pronged groundedreceptaclewith ap propriate electrical current for the machine B Choose a well ventilated site C Setthe Porta Screen on a solid stable floor platform or other surface When you have placed the Porta Screen in its operating location and each time you move it level the unit by adjusting the three leveling legs To extend a leg place your foot on the edge of the pad and lift up on the machine above the leg To contract a leg depress the leg lock tab which extends from the case above each footpad Usethebullseyelevel in the top frame crossbar as a guide After you have placed the Porta Screen into service observe the distribution of sample material in the trays at the end of atest If the material is not evely distributed re level the machine Reinstall the trays in the Porta Screen Leave them unclamped Do not plug in the Porta Screen until you are ready to use it Page 2 Gilson Company Inc PS 3 PS 4 Porta Screen ll Operation WHETHER YOU ARE THE OWNER EMPLOYER OPERATOR OR MAINTENANCE PERSON FOR THIS MACHINE SAFETY IS YOUR RESPONSIBILITY YOU ARE RESPONSIBLE FOR OPERATING AND MAINTAINI
7. crew which holds the rear bear ing to the counterweight shaft Removethe mounting screws 42 which hold the front counterweight shaft bearing 41 to the main frame Pull the counterweight shaft from the front of the machine with its front counterweight pul ley and front bearing all attached Reinstall parts as needed Reassemble in reverse order When replacing timing belt refer to timing belt instructions and be sure that the counterweights are aligned properly DO NOT PLUG IN THE PORTA SCREEN UNTIL YOU ARE READY TO USE IT 4 Wire Cloth Check condition of wire cloth both before and after operation Test results can be only as accurate as the size of wire cloth openings Al ways replace with testing grade wire cloth only Testing grade wire cloth is a precision made material and should be treated with care The ASTM E 11 specification permits only very slight variations in average opening and wire diameter Abrasion due to normal use and or improper cleaning and handling can cause the wire cloth to be out of specification to a considerable degree before it appears worn Check it frequently to be sure that it conforms to your test specifications The life of the wire cloth can be prolonged by estab lishing properprocedures for handling cleaning and storage of trays The Porta Pan Accessory is helpful intherepetitivesequenceofemptyingtrays cleaning wire cloth and weighing sample fractions Wirec
8. er 4 8 Clamp bar 1 9 Clamp adjusting nut and spacer 4 Counterweight Assembly Parts 12 Left counterweight shaft short 1 13 Right counterweight shaft long 1 41 Counterweight shaft bearing 4 42 Counterweight shaft bearing mounting screw amp lock washer 8 14 Counterweight 4 43 Counterweight clamp bracket 4 44 Counterweight clamp bracket bolt lock washer 8 15 Counterweight shaft pulley set screw 2 16 Timing belt 1 17 Idler bracket 1 45 Idler bracket mounting screw with lock amp flat washers 2 46 Idler bracket adjusting screw with locking nut 1 18 Idler pulley mounting screw amp lock washer 1 19 62 Idler pulley with bearing set 1 Drive Shaft Assembly Parts 20 Drive shaft with eccentric set screw and roll pin 1 47 Drive shaft bearing 2 42 Drive shaft bearing mounting screw amp lock washer 4 49 Timing pulley amp set screw 1 21 Drive pulley with set screw 1 22 Drive belt 1 Page 8 Gilson Company Inc PS 3 PS 4 Porta S creen Parts List for PS 3 and PS 4 Porta Screens Parts No Req d Connecting Rod Assembly Parts 50 Connecting rod with grease fitting 1 51 Connecting rod rubber bushing 1 52 Connecting rod bearing with inner race 1 Connecting rod assembly Parts 50 51 52 assembled 1 24 Connecting rod mounting bolt with lock nut 1 54 Connecting rod mounting bolt spacer 2 Lower Guide Bearing Assembly Parts 59 Lower guide bearing housing with guide bushing 1 56 Lower guide bearing mounti
9. loth may eventually sag reducing its effective screening area Wire sizes 2 to No 14 are rigid and self supporting Trays for No 16 through No 80 wire cloth contain three wire cloth support strips No 100 and finer trays have supporting backup cloth to minimize wear and distortion When you replace No 16 and finer wire cloth always use support strips or backup cloth as indicated Page 7 Gilson Company Inc PS 3 PS 4 Porta S creen Parts List for PS 3 and PS 4 Porta Screens Parts No Req d Outer Case Frame Parts 1 Top frame cross bar 1 2 Top frame screw amp lock washer 4 31 Bullseye level with cushion washer 1 36 Bullseye level adjusting screws 3 27 Leg lock tab 3 33 Leg lock tab spring 3 65 28 Leveling leg 65 with adjusting screw pad nut amp washer 3 29 Main frame 1 30 Vibrating unit assembly Upper case cover 2 11A Lower case cover front 1 Lower case cover rear al Upper Guide Bearing Assembly Parts 34 Upper guide bearing housing with guide bushing 2 35 Upper guide bearing mounting screw lock washer 4 4 Upper guide bearing pin amp set screw 2 Clamping Assembly Parts Right amp Left 5A Clamp lever with mounting bracket 6F left side 1 5B Clamp lever with mounting bracket 6F right side 1 38 Clamp lever handle grip 2 6R Rear clamp lever mounting bracket 2 39 Clamp lever mounting bracket screw lock washer 8 7 Clamp tension rod 4 40 Clamp tension rod retainer clip screw and lock wash
10. ly Parts Faxback Form Inside Cover 5 7 8 11 12 Page 1 Gilson Company Inc PS 3 PS 4 Porta S creen Models PS 3 and PS 4 The Gilson Porta S creen is a portable shaker for field control of construction aggregates and for quality control in asphalt and ready mix plants Itis designed for best separation in the 2 50 8mm to No 16 1 18mm range Model PS 3 holds five screen trays and a pan PS 4 s capacity is seven trays and a pan Unpacking Installation The Porta Screen packed for shipment weighs between 225 and 255 lbs depending on the model and the number of trays packed inside Use equip ment to adequately to handle this weight safely 1 The Porta Screen is shipped in a cardboard carton Before you acceptthe shipment check the carton for visible damage Note any dam ageonthefreightbill and proceed with inspec tion Place the carton on its side so that you can removethe staples from the bottom Open the bottom flaps and setthe machine uprightagain Lift off the carton and set it aside until you are sure that the Porta Screen is in acceptable condition Checkthemachinefor shipping damage If you find concealed damage after you have signed for the Porta Screen call the delivering carrier immediately for an inspection Save all pack ing materials and leave the Porta Screen as it is Checkthe tag on the electric motor of the Porta Screen to be sure that the machine is wired
11. ng screw lock washer 2 26 Lower guide bearing pin 1 64 Lower guide bearing pin clamp bolt with lock nut 1 Electric amp Drive Parts 63 Motor 1 4 hp 115V 60Hz 1Ph 1725 RPM 1 60 Motor Pulley set screw 1 61 Motor mounting bolt with lock amp flat washer 4 Electric cord assembly motor to timer 1 Electric cord assembly with ground plug 1 Electric cord grip grommet 1 Timer Digital EDA 1 Timer Digital Artisan 1 Replacement Trays and Wire Cloth Porta Screen Tray complete with wire cloth Model PSA 300 2 to No 4 inclusive PSA 301 No 5 to No 14 inclusive PSA 302 No 16to No 80 inclusive w wire cloth supports PSA 302 No 100 with backup cloth PSA 306 No 200 with backup cloth PSA 310 Dustpan tray Replacement Wire Cloth complete with metal shields resilient gasket backing Model PSA 325 2 to No 4 inclusive PSA 326A No 5 to No 14 inclusive PSA 326B No 16 to No 100 inclusive Screen Tray Parts PSA 327 No 200 PSA 225 Backup cloth use with No 100 to No 200 Model PSA 336 Tray complete but without wire cloth supports or backup cloth Tray side clamp 4 req d per tray Tray bolts amp nuts 12 req d per tray Wire cloth support 3 req d per tray Page 9 Gilson Company Inc PS 3 PS 4 Porta Screen Porta Screen Tray cloth has metal shields to eliminate partial openings z Porta Screen has Foot Tab leveling PORTA WHEELS PS 3 P
12. nt for the machine IV Always disconnect and lock outthe power supply before performing maintenance or repairs on your machine A DANGER A DANGER Warning Warning Warming Warning Warning Warning Warning Warning The 1 4 hp 115 volt motor of the Porta Screen has internal thermal protection Therefore the motor will automatically shutoff if overloaded The motor will restart by itself after cooling unless disconnected from its power source during cool down Do not use the Porta Screen in an explosive or hazardous atmosphere It is not explosion proof Operate only in a properly ventilated area Level the Porta Screen before operation Stop the Porta Screen if excessive vibration or machine movement occurs Always take care not to pinch your fingers between the clamp levers and the machine frame Do not operate without all guards and covers in place Keep all parts of your body away from moving parts of the machine while it is operating Do notwear looseclothing which mightbe caughtin moving parts of the machine Wear safety glasses protective clothing and hearing protection Wear ap proved NIOSH MSHA respirator as required by the sample to prevent your inhaling any dust which may be considered hazardous Gilson Company Inc PS 3 PS 4 Porta S creen Vi Table of Contents Safety Instructions Unpacking amp Installation Operation Sample Capacity Maintenance and Disassemb
13. orta Screen has predrilled mounting holes for quick addition of PSA 114 Porta Wheels for mobility Set includes two ball bearing rubber tires attached to steel mount ing fixtures Page 12
14. orta Screen has three guide bearing as semblies each has a housing and guide bush ing The two upper guide bearings 84 are mounted to the top frame crossbar Thelower guide bearing 59 is mounted to the under O gt 0 Qa A FD WD The connecting rod 50 can be replaced as an assembly or you can press out and replace its bearing and bushing 52 The drive shaft 20 has front and rear bear ings 47 We recommend replacement of both front and rear bearings as a set DISCONNECT AND LOCK OUT ELECTRIC POWER Remove and set aside trays and pan Remove top frame screws 2 Lift off top frame crossbar 1 Remove all case covers Remove the connecting rod mounting bolt 24 Lift the entire vibrating unit assembly up and outof the Porta Screen frame Page 6 Gilson Company Inc PS 3 PS 4 Porta S creen h Loosen the motor mounting bolts to re lease tension on the drive belt and remove the drive belt from its pulleys Loosen the setscrew in the drive pulley 21 and slide the pulley off the drive shaft Loosenthesetscrew inthereardriveshaftbearing Loosen the idler bracket mounting and adjusting screws 45 46 to releasetensiononthetiming belt Remove the timing belt 16 Loosen the setscrew in the drive shaft pulley 49 and slide the pulley off the drive shaft Remove the mounting screws from the front drive shaft bearing 47 Hold onto the to
15. p of the connecting rod 50 while you pull the drive shaft out from the front of the machine with the front bearing attached p Remove the connecting rod 50 q Install new connecting rod assembly or press new bushing and bearing into existing connecting rod Replace drive shaft bearings if needed Continueorreassembleinreverseorder When replacing timing belt refer to timing belt in structions and be surethat counterweights are aligned properly DO NOT PLUG IN THE PORTA SCREEN UNTIL YOU ARE READY TO USE IT 3 Counterweight Shaft Bearings O gt oa 0 od Each of the two counterweight shafts 12 13 has a front and a rear bearing 41 We recommend replacement of both bearings on a Shaft If you have disassembled the Porta Screen to replace the connecting rod and or drive shaft bearings skip to step h Otherwise disassemble as follows DISCONNECT AND LOCK OUT ELECTRIC POWER Remove and set aside tray and pan Remove top frame screws 2 Lift off top frame crossbar 1 Remove all case covers Remove the connecting rod mounting bolt 24 Lift the entire vibrating unit assembly up and out of the Porta Screen frame Loosentheidler bracket mounting and adjusting 45 46 to release tension on the timing belt i Remove the timing belt 16 j Loosen the bolts on the rear counterweight clamp bracket 43 and remove the counter weight from the shaft Loosenthesets
16. r Screen Analysis of Fine and Coarse Aggregates calls for the minimum weight of the test sample of coarse aggregates density such as limestone or gravel as follows Minimum Sample Weight Kg Ib Nominal Maximum Size of Particle These guidelines on minimum sample size quantities are for representative samples Al ways take a much larger amount perhaps from several spots in a storage bin or stock pile Then combine and reduce them to the correct quantity by splitting limiting tray should have no more than one layer of particles over the wire cloth at the end of the test Therefore lightweight aggre gates or coal must be tested in lower sample weights High density ores or pellets may be tested in larger amounts by weight Many light materials are also soft and test times should be limited to avoid degradation of the sample Most samples of up to 2 topsize can be handled in a single batch without difficulty We do not recommend the use of trays with mesh sizes above 1 1 2 since larger par ticles become wedged in the mesh and make it difficult to remove the trays Fine Aggregates With fine series trays No 8 to No 200 the limiting tray should contain no more than approximately four grams per square inch of sieve surface at the end of atest Assuming that the material is about the density of sand there will be approximately 800 grams maxi mum on the limiting tray Since the Porta Screen is designed p
17. rimarily for use in the 2 to No 20 range separations in finer sizes will not be as precise If you are testing materials exclusively in the fine range we recommend equipment specifically de signed for this purpose such as the Gilson Model SS 8R Sieve Shaker Page 4 Gilson Company Inc PS 3 PS 4 Porta S creen IV Maintenance READ AND BE SURE YOU UNDERSTAND ALL SAFETY AND MAINTENANCE INSTRUCTIONS BEFORE PERFORMING MAINTENANCE ON YOUR PORTA SCREEN ALWAYS DISCONNECT AND LOCK OUT ELECTRIC POWER BEFORE PERFORMING MAINTENANCE Clamping System 1 2 DISCONNECT AND LOCK OUT ELECTRIC POWER Load the Porta Screen with trays and pan fill ing all the slots Rotatethe clamp levers 38 so thatthey pointdown Locate the clamp adjusting nuts 9 which are on the lower ends of the four clamp tension rods 7 Tighten the nuts only enough to prevent the trays from rattling when the machine is operating Lubrication 1 2 3 4 DISCONNECT AND LOCK OUT ELECTRIC POWER Remove and set aside trays and pan Remove upper case cover Connection Rod Bearing Lubricate the connecting rod bearing 52 after every 80 to 100 hours of operation a Rotate drive shaft 20 slightly by hand until the grease fitting at the lower end of the connecting rod 50 is accessible Grease fitting may be pointing either to the front orto the back of the Porta Screen b Apply asmall amount of any good qu
18. unterweights are at their lowest position side of the vibrating unit If you notice side to side movement of the vibrating unit during operation inspect the guide bearings and replace them if necessary We recommend replacement of all three as semblies at the same time a DISCONNECT AND LOCK OUT ELECTRIC POWER b Remove and set aside trays and pan f Remove top frame screws 2 and lift off top frame crossbar 1 Upper 1 Remove mounting screws 85 to detach bearing housing 84 2 Replace with new bearing housing assembly Lower 1 Remove all case covers 2 Remove the connecting rod mounting bolt 24 3 Lift the entire vibrating unit assembly up and out of the Porta Screen frame 4 Remove mounting screws 56 to detach bearing housing unit 59 5 Replacewith new bearing housing assembly Reassemble in reverse order shaft pulley around the timing pulley 49 ARE READY TO USE IT above the right counterweight shaft pul ley and around the idler pulley 19 2 Connecting Rod amp Drive Shaft Bearings 4 Tighten the idler bracket adjusting screw until the timing beltis tight making certain that you do notchangethe position of the shafts Lock the idler bracket in posi tion with the nut Tighten the bracket mounting screws 5 Reassemble DO NOT PLUG IN THE PORTA SCREEN UNTIL YOU ARE READY TO USE IT Bearing Replacement 1 Guide Bearing Assemblies The P
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