USER GUIDE SINGLE PAGE.cdr
Contents
1. HYDRAULICS PIX FLEXEQUIP HYDRAULICS LIMITED E mail info pixflexequip com Website www pixflexequip com p LIMITED HYDRAULICS PIX FLEXEQUIP HYDRAULICS LIMITED E mail info pixflexequip com Website www pixflexequip com ml BELTS amp HOSES PIX SOUTH AMERICA LIMITED E mail info pixsam com Web Site www pixsam com 2 AMERICA BELTS amp HOSES PIX HYDRAULICS amp TRANSMISSIONS Hangzhou Ltd E mail info pixqcs com Web Site www pixqcs com2. PIX Ribbed belts Tensioning procedure To achieve the best from your ribbed belt drive itis a must to maintain optimum tension in the drive Under or over tensioning can cause the ribbed belt to fail prematurely Following steps should be carried out while tensioning the ribbed belt drive 1 Fit the belt on the pulleys with no or zero tension 2 Draw two lines perpendicular across the belt at about 80 of the belt span between the pulleys as shown in the figure Say for example the lines are placed 1000 mm apart A 2 Lines drawn d mU at approx 80 of span 3 Increase the distance between the two lines by 0 5 to 0 75 i e by 5 to 7 5 mm for an initial spacing of 1000 mm so that the A now become 1007 5 mm Lines after tensioning 4 4 Run the drive under load for about ten minutes 5 Check the tension spacing between two lines amp readjust if necessary 39 Troubleshooting Problems Ribbed belts are breaking after a short period of running Cuts and splits in the Ribs Severe belt vibrations Cannot be re tensioned Causes a Force applied on the belts over the pulley during installation b Overloaded drive c Ingress of foreign material a Pulley diameter too small b Ambient temperature too high c Abnormal belt slip d Contamination by chemicals a Overloaded drive b Centre distance
3. 19 We Do CARE Commitment Ability Reliability Efficiency Corporate Office amp Works J 7 Hingna PIX Germany GmbH Germany PIX Middle East FZC UAE PIX South America Ltd Brasil PIX Hydraulics amp Transmissions Hangzhou Ltd China Particulars Profile Certifications Free Set Concept Installation Procedure for V Belts Preventive Maintenance Service Equipment Minimum Recommended Diameter Storage Type of Failure Troubleshooting Types of failure Banded Belts Troubleshooting Banded Belts Installation Procedure Ribbed Belts Tensioning Procedure Ribbed Belts Troubleshooting Ribbed Belts Do s and don ts V belt conversion factor Page No 01 02 03 04 05 12 13 18 19 27 28 29 30 31 32 35 36 37 38 39 40 41 42 44 45 Profile PIX TRANSMISSIONS LIMITED is engaged into the manufacturing of an extensive range of world class quality Industrial V Belts Automotive Belts Steel Wire Braided Hydraulic Hoses Hose Assemblies amp End Fittings to suit various power drive needs PIX manufacture belts in Wrap Cut Edge Ribbed or Poly Belts Synchronous Belts amp Application Specific constructions They are manufactured at Its state of the art facilities at Nagpur Bazargaon Its both the facilities are designed to include all sophisticated manufacturing and testing facilities under one roof and confirms to the stringent ISO TS 16949 2002
4. Ambient temperature too low below 18 C e Abnormal belt slip a Belt slipping under starting or stalling load b Worn sheaves a Extreme shock load b Misaligned drive Remedies d Maintain proper temperature e Check drive tension amp check drive design to ensure correct number of belts a Replace belt amp tighten drive until the slipping stops b Replace sheaves a Remove cause of load b Check drive alignment Foreign particle in drive c Use drive guard d Belt turnover in pulley 35 d Excessive slippage Types of Failure BANDED BELTS Separation of tie due to improper belt setting in the pulley groove Belts leaving tie due to improper setting and misalignment 36 Troubleshooting BANDED BELTS Problems Causes Remedies Tie band a Worn sheaves a Check sheave separating grooves amp replace with std groove sheaves b Wrong pitch e b Use standard pitch dimension of pulley dimension of pulley grooves One strand a Possible misalignment Align the drive properly riding outside lack of tension or re tension and remove the sheave foreign object forcing any interference from groove the belt off from the foreign object sheave groove Outside belt and Belt has jumped one Replace the belt and adjacent to it groove forcing outside set it properly in have started to belt off the sheave aligned grooves separate b Improper tension or b Tension properly misali
5. Excessive belt flap d Low belt tension e Worn out belts f Ingress of foreign material a Incorrect pulley section b Excessive wear of pulley groove c Poor drive alignment d Pulleys of improper diameter e Belt catching on protruding parts a Poor drive alignment b Incorrect belt tension c Overloaded drive d Unbalanced pulleys 32 Remedies a Re align b Renew replace pulleys c Use idler on slack side d Re tension e Replace with new belts f Use more effective drive guard a Replace pulley b Re machine pulleys c Realign d Redesign using correct pulley diameter Use PIX notched V Belts e Remove protrusion or move drive away a Realign b Re tension c Check drive details and redesign d Redesign the drive amp balance the pulleys Troubleshooting V BELTS Problems Belt swelling or softening Excessive wear Belt breaking after fitment Causes a Contamination by oil or other chemicals a Worn out badly damaged grooves b Drive with old and new belts together c Belts from various manufacturers a Forcing belt over pulley when fitting damaging cord and cover b Ingress of foreign material c Insufficient belt or wrong section or drive d Drive stalled 33 Remedies a Protect the drive from contamination clean pulley grooves with petrol alcohol before putting new belts If contamination is unavoidable use PIX AOH Belts a
6. ISO 14001 amp OHSAS 18001 standards All its products are known for their efficiency reliability and trouble free operation and they can perform even in most adverse conditions PIX V belts and Hoses are suitable for Industrial and Automotive applications and the end users of its products belong to cement industries power corporations steel industries oil companies mining and other engineering industries PIX s stress on consistency in quality has qualified it as a trusted and reliable manufacturer of V belts and Hoses not only in India but in overseas market also Certifications CFRTIFK ATI iah ie me aec 30 700 orm arm tme orm arm tme ATEX Certification IBExU Institut f r Sicherheitstechnik GmbH Directive 94 9 EC Test Report No 03 4 934 Il 2GD c IIB X Free set concept PIX s innovative concept of Free Set V belts gives the advantages of having No length code Low variation in length tolerance Less centre adjustment Low stretch Low variation in elongation within a set of belts Uniform power transmission Longer life Reduced maintenance periodicity Less inventory PIX FREE SET BELT TENSIONING PIX Free Set V belts are specially constructed to arrest variation in the length as a result there is exceptionally low variation in the length You
7. Re machine or renew pulleys b Replace with new set of V belts c Use belts from same manufacturer a Reduce drive centre distance to fit belt b Use drive guard c Design the drive amp use correct section amp number of belts d Ascertain cause and rectify Troubleshooting V BELTS Problems Cannot be re tensioned Excessive Slippage Transversal cracking Causes a Insufficient allowance for stretch in drive design b Excessive stretch caused by insufficient belts or wrong belt for the drive c Incorrect belt length d Belt from different manufacturers used on the same drive a Too low belt tension b Too small area of contact c Overloaded drive d Worn belt pulley a Too small pulleys b Outside idler pulleys c Ambient temp Too high above 60 C 34 Remedies a Give sufficient allowance for take up b Recalculate drive design and modify c Use a shorter belt d All the belts must be from one manufacturer a Increase belt tension b Increase shaft centre distance c Redesign belt drive d Change to new belt or pulley a Use standard size pulley or use PIX notched or Cogged belts b Use inside idler pulley in slack side c Ensure good ventilation amp protect from direct heat or use PIX AOH Belts Troubleshooting V BELTS Problems Transversal cracking Bottom amp side of belt burnt Belts pulled apart Snapped Causes d
8. Sci S6 58 02 061 00081 gt 0009 lt 98 04 09 05 0005 gt 0092 lt 00 GL 09 05 GEL 0052 gt 00001 00 99 99 Sr 00001 gt 0008 lt 00 49 55 Sv 58 0008 gt 00 9 06 09 Sr Se 02 0059 gt 0005 lt 06 99 ov 05 55 0005 gt 000 lt 58 05 SE 05 Sr 0007 gt 000 lt 58 os Ge 05 56 0006 gt 0 00 lt Ge 05 Sc Ovcc gt 008 lt S 05 Sc 0081 gt 0021 5 VHIV ww x A uonelie sul dn ayey 1149 1 Installation 5 Checking Alignment Align groove like this Proper alignment of pulleys is p vital to attain better perfor mance Use following method Shafts Parallel to check the alignment of m pulleys Cord tied to shaft Alignment checking using straight edge Cord touching pulleys at point indicated by arrows 6 Re tensioning Proper tensioning is required to achieve maximum output from the drive For any new installation belt tension should be checked for the first two days of the operation and it should be re tensioned if required 7 Drive Guard Once the installation is done the drive should be covered with appropriate drive guard 12 Preventive maintenance PREVENTIVE MAINTENANCE Accessibility to the drive It is imperative to maintain safe access to the drive The drive area should be kept free from clutter debris or a
9. coincide x mm with the lower side of the ring Adjust lower side of the upper ring at 0 00 N 20 Service equipment Place Tension Tester at the centre of the belt span Apply force with the help of Tension Tester perpendicular to the span till the lower surface of the ring touches the string Read the deflection force value on the Newton s scale by taking reading at the lower side of the upper ring Compare the deflection force value N with the values given in the table The deflection force value N should lie between the minimum and maximum values given in the table A Deflection force less than minimum recommended value in the range indicates an under om tensioned drive amp deflection force higher than maximum recommended value indicates an over tensioned drive 21 PIX Tension Tester t ice equipmen Serv le Srl 6 2 68 026 612 St 1 46 81 021 021 68 691 101 621 021 68 96 101 69 021 28 19 1 22 19 66 19 17 26 19 96 19 1 26 12 66 42 17 68 62 4 6L L vc 9L 8 L 6 8 2 6 8 2 8 S 4 6 8 5 sju 06 0102 s u 020301 suu 0 0 0 paads 3jaq 10 jo ay je 49210 000 uey 5501 s ueds J ueds Jo 5 uono lj q z 9 091 601 502 761 072
10. contact measurement with repeated accuracy Large range of measurement from 10Hz to 600Hz High level of accuracy Evaluation of the quality of measurement results Suppression of background noises Universal measuring head for convenient measurement Detachable measuring sensor for narrow spaces Technical Data Range of Measurement 10 600 Hz Measuring Precision 10 400 Hz 1 400 600 Hz 2 t 1 digit Measuring Method Non contact acoustic with background noise suppression Voltage Supply 2 1 5V Mignon LR06 Power Consumption 25mA Display LCD 2 lines of 8 characters Working Temperature to 50 C Storage Temperature 20 to 60 C 19 Service equipment SERVICE EQUIPMENT PIX V belt Tension Tester Proper belt tension is vital to derive the best from your drive it is recommended to check belt tension by measuring the deflection force value N with the help of a tension measuring device The belt tension in most of the drives can be checked with adequate reliability by means of PIX Tension Tester Tension measuring procedure Measure the span length of the belt in mm Ref sketch Tie a string thread on the two pullies along the length of the belts and mark centre of the span on the belt Calculate 1 5 of the span say x for belt length less than 1000 mm amp 1 of the span for belt length more than 1000 mm Adjust lower ring on the Tension Tester on mm scale to
11. more than recommended c High shock load d Too low belt tension e Unbalanced pulleys a Insufficient allowance for re tensioning 40 Remedies a Use proper installation techniques b Redo drive design check the number of ribs c Use drive guard a Redesign using the min recommended diameter table b Ensure good ventilation c Check drive tension d Protect the drive a Redesigning of drive may be necessary b Use an idler on the Slack side c Use an idler on the Slack side d Re tension the drive e Balance the pulleys a Modify the drive Troubleshooting Problems Cannot be re tensioned b Excessive wear of ribs b oa f Causes a Due to excessive stretch caused by overloaded drive Incorrect belt length Starting torque too high Incorrect pulleys Excessive wear of grooves Poor drive alignment Smaller than recommended min pulley diameter Belts catching on protruding parts g Wrong section of belt for pulleys h Too low belt tension Excessive Noise a P oor drive alignment b Incorrect belt tension c High shock load Belt swelling or a Contamination by oil softening grease or chemicals 41 Solution a Redesign the drive b Use a shorter length belt a Redesign the drive b Re machine or replace the pulley c Re machine or replace the pulley d Realign the pulleys Redesign using correct pulleys D f Remov
12. storage The most common method of storing V belts is to hang them in crescent shaped pegs or pin racks Long length V belts should be coiled for an easy and distortion free storage Variable speed belts are more sensitive to distortion It is recommended not to hang them on the pegs They should always be stored on shelves Effects of storage A shelf life of 6 years can be obtained if proper storing conditions are maintained i e temperature not more than 30 C amp relative humidity not more than 60 If storage temperature exceeds 30 C the service expectancy of the belt reduces drastically Under rough estimates it is said that for an increase of 8 C above the stipulated temperature the belt life gets reduced by 50 If the drive is to remain out of use for a prolonged period of time it is suggested that the belt tension should be relaxed Under no circumstances the belts should be stored at temperatures above 46 C 29 Types of failure V BELTS Bottom crack Belt snapped Stuck up and burnt 30 Types of failure V BELTS Belt snapped due to breaking of cord while fitment Envelope wear side bottom amp top wear out Belt twisted due to belt turnover in the pulley 31 Troubleshooting V BELTS Problems Belt turnover in pulleys Excessive wear Excessive noise Causes a Poor drive alignment b Incorrect pulley groove or excessive wear of pulley groove c
13. wide the canvas cover over the belt gets worn out quickly along the lower side walls and if opposite the upper canvas of the belt gets worn out 44 V belt conversion factor CLASSICAL SECTION Secti BELT LENGTH FACTOR ecuon Lp to La Lp to La Lp to La mm mm mm 8 1 19 31 ZIZX 16 22 38 AIAX 20 30 50 B BX 26 43 69 20 48 79 CICX 32 56 88 25 39 61 100 D 40 19 119 53 145 WEDGE SECTION BELT LENGTH FACTOR eens SPZ XPZ 13 37 50 SPA XPA 18 45 63 SPB XPB 28 60 88 19 25 69 94 SPC XPC 30 83 113 NARROW SECTION BELT LENGTH FACTOR Section Lp to La Li to Lp Li to La mm mm mm 3V 3VX 13 37 50 5V 5VX 25 60 85 8V 8VX 53 92 145 45 Notes CORPORATE OFFICE amp WORKS PIX TRANSMISSIONS LIMITED J 7 0 Hingna Road Nagpur 440 016 Maharashtra India Ph 91 7104 237729 Fax 91 7104 236505 6 E mail info pixtrans com Web Site www pixtrans com 7 lt EUROPE LIMITED BELTS amp HOSES PIX EUROPE LIMITED E mail infoG pixtrans com Web Site www pixtrans com b lt GERMANY GmbH BELTS amp HOSES PIX GERMANY GmbH E mail info pixgermany com Web Site www pixeuro com HYDRAULICS PIX FLEXEQUIP HYDRAULICS LIMITED E mail info pixflexequip com Web Site www pixflexequip com LIMITED
14. 0 ueds jo a 4 2910 paJinbay 94 49210 pasinbay uop s s 000 uey ssa s ujBuej ueds 000 uey s 25919 gt ueds jo 45 ueds 0 1 z uonpuo uonipuo Hg 61148 MOHUVN 39Q3M V ONINOISNAL 2 o C LZ 8v 68 89 ZOLL 69 96 29 77 18 69 007 xo c 8 16 85 07 8 96 60 7 08 65 96 00 0 LE Ge vV 6c 79 18 82 81 66 00 0 82 002 xa 95 51 62 02 46 42 81 5 51 82 81 002 06 12 1 82 81 v6 91 21 levi 9 oge OL 21 6 81 21 6 2 21 8 71 6 071 59 6 8 6 vl 6 28 8 2 01 4 001 9 5 8 9 6 9 5 5 9 5 LS 001 0 2 050307 s u 02000 lt 0 0 0 s w 060300 5 020 0 s w 04 040 paads 10 ueds jo paads 0j ueds Jo 4 3 4 9210 pauinbay 84 4 22101 pasinbay eem 101995 000 uey 559 s ujBu ueds ji 000 51 8505 ueds jo G ueds ji ueds ji 07 1 2165 10 3903 100 v IHVHO ONINOISNAL Serv CUT EDGE BELTS 24 201 08 111 68 061 101
15. 091 e oqe 916 601 84 281 06 091 801 916 08 3 06 29 9 94 751 06 9 009 29 27 92 29 06 29 009 618 95 15 85 85 0 9 anoge 00 o 1 02 85 92 9 18 00 081 9 72 91 62 61 68 002 91 01 61 1 2 91 002 211 21 8 1 01 81 21 m 8 9 01 4 21 8 0 1 14 v 9 5 1 9 6 9 001 lt re Sr 9 001 08 2 o sju 050302 s w 02030 0030 lt O 000 uow s ujBuo 35919 ueds ji 0 2 51148 1 2165 192 v 081 ONINOISNAL 22 191 46 481 021 2 Ot L 06 491 201 024 8 o 26 4 021 16 801 96 06 89 201 18 025 466 5 56 69 101 21 51 88 07 26 97 96 38 99 2 9998 c 69 57 22 16 88 19 06 06 85 86 99 97 5966 20 m 6 96 95 67 9 87 26 72 7 65 97 95 692 96 0 trc 87 55 2258 55 06 96 52 598 0 62 61 46 62 17 26 96 21 15 06 Op L 61 61 62 91 22 61 02 1 0v1 06 ee c rn 65 91 vi 6 91 01 218 96 x 21 8 61 6 6 9 01 4 21 8 66 59 248 lt ui ex og 0 s u 02030 lt 0 010 s u og opoz s u ozo o lt 0 010 9 paeds 40 ueds jo 31 4 1
16. 18 09 28 29 86 9 aroge 08 6 68 89 09 45 19 97 65 556 081 1917 59 67 12 99 57 15 2 46 59 7 992 o 17 82 6 15 99 85 16 12 16 65 17 65 992 211 8 1 0 92 8 15 92 91 0 02 95 52 12 91 92 81 91 21 02 1 62 91 VX 92 61 92 81 91 01 81 21 0 1 96 6 81 21 01 4 21 8 71 6 56 96 2 o 10 N N a x O 0 0302 lt 0200 lt 0 010 s u 08002 lt 020 0 s w 0 0 0 paads 31 4 10 ueds Jo paads 31 4 10 ueds jo OY Je 3 210 94 49210 uon2ejjep Ses uonoes T 000 uey 5581 sI ueds J 000 s 3502 ueds jo 9 uono lj q ueds ji ueds 0 uonoayaq z uonipuo LI gt gt o MOHHVN 3OQ3M 3903 100 v eiger 9NINOISN3 L Service equipment Important For new belts the deflection force value N should be kept at maximum Maximum deflection force value N is recommended for pulsating amp shock loads After approximately 24 hours of running check the belt tension and adjust if necessary PIX PULLEY GAUGES PIX Pulley Gauges are specially designed for checking the grooves of various s
17. e protrusions 9 Go for correct belt h Re tension the drive a Realign the pulleys b Re tension the drive Redesign the drive a Protectthe drive Do s amp dont s Do s and Don ts of PIX V Belts Ensure perfect alignment of pulleys Oo The grooves should be free from burrs sharp edges rust oil and grease Use proper drive guard to prevent this Belts used in the multiple drive should be from the same manufacturer Do not place used and un used belts together on the same drive wv WRONG 42 Do s amp dont s Do not pry or roll V belts into the pulley grooves if done so the belt gets damaged internally Using drive take up enables the belt to get easily mounted on pulleys In a multiple drive pulley make sure that the drive is fitted with all the required number of belts to get the best power perfomance ratio It is recommended to replace the whole set even though a single belt in the set has failed Do not lubricate the belts at any stage of its life www Www A change in ride out indicates uneven belt wear or worn sheaves Change belt sheaves with a new set LIKE THIS NOT THIS s s Ww 43 Pulley should be checked for its correctness whether it is manufactured as per international standards or not and should also be checked for worn out grooves Bearings should be lubricated periodically w wey If the pulley grooves have become too
18. ections Groove checking procedure Identify the pulley gauge to be used according to pulley s section and its diameter Check the groove by inserting the gauge Identify if any clearance is there between the side walls of pulley groove and the gauge Measure the clearance using Feeler Gauge PIX Pulley Gauge 26 Service equipment PIX LENGTH FINDER It is used to check the length of a particular belt or sometimes in used belts the size of the belt is not clearly visible It can also be used to confirm the size of the belt PIX has two types of Length Finders Conventional Poly V The maximum length which can be measured with these length finders is 120 inches Length measuring procedure Place the belt on the upper fixed half of the pulley Slide down the lower half of pulley with the belt along the scale till the belt gets sufficiently stretched The markings at the lower position of bottom half will show the reading in mm inches Note down the reading and compare it with the size mentioned on the belt 27 Min recommended dia MINIMUM DIAMETER RECOMMENDED Minimum Section Minimum Section Minimum Diameter Diameter Diameter 8 40 2X 40 SPC 224 Z 50 AX 63 3V 63 A 71 BX 90 5V 140 B 112 140 8V 335 180 80 XPZ 3VX 56 D 355 BB 125 m E 500 224 XPB 5VX 112 19 180 SPZ 63 XPC 180 20 160 SPA 90 25 250 SPB 140 28 Storage STORAGE Methods of
19. edge Cord touching pulleys at point indicated by arrows 17 Preventive maintenance Belt guard inspection Check the belt guard for protruding parts or sharp edges if any Check for proper ventilation Clean if it is dirty Inspection of drive components Check the bearings for proper lubrication Check the motor mounts for proper fitment amp firmness Keep the take up rails free from any foreign obstacles Check belt tension In many cases the drives fail prematurely and doesn t give satisfactory life due to improper tensioning For efficient running of the drive an optimised belt tension should be maintained as long as the belt is being used Optimum belt tension can be defined as minimum tensioning force at which the belt will not slip under full load condition Too low belt tension will cause the belts to slip abnormally On the other hand too high tension will reduce the life of the belt amp bearings Hence optimum belt tension should be maintained on the drive 18 Service equipment PIX Digital Tension Meter PIX Digital Tension Meter is used for the measurement of belt tension in a drive This digital version helps in correct tensioning of the drive resulting into optimum power transmission It helps in reading the exact value of tension on the belts thus helping the users to correct the tension if it is not proper This equipment works on frequency measurement phenomenon Advantages Non
20. gnment or foreign object c Wrong pitch e dim c Use standard pitch of pulley grooves dimension of pulley All belts a Riding outside and a Proper maintenance separated above sheave grooves of drives amp installation the band of belts b Too loose contact b Adjust shielding tieband Obstructions a Re align the drive amp frayed or interfering with normal remove obstructions damaged operation of the belt Cracks at the bottom of the Belt slipping a Check belt tension belts 37 PIX Ribbed belts Installation procedure for ribbed belts Ribbed belts are new generation belts it is important to follow proper installation procedure to attain the best power performance ratio Given below are some of the installation tips which are to be followed strictly while using Ribbed belts 1 Switch off the main supply before beginning with the installation process 2 Bring the pulleys close to each other so that the belt can be placed easily 3 Inspect the pulley grooves for any scores sharp edges dirt or rust clean them if required 4 Ensure proper alignment of pulleys Make sure that the shafts are also properly aligned 5 Mount the ribbed belt with zero or no tension Make sure that the ribs are properly seated in the grooves 6 Tension the belts as per procedure 7 Give some running time to the drive so that the belt gets properly seated in the groove 8 Guard the drive properly 38
21. iticality of the the drive Temperature extremities Environmental factors If the drive is exposed to any of the above condition the drive should be inspected periodically at shorter intervals To help the maintenance person to prepare his maintenance schedule following guidelines can prove to be very helpful Critical drives A quick visual amp hearing inspection may be planned once a week 14 Preventive maintenance Normal drives A quick visual amp hearing inspection can be done once a month Complete inspection Complete inspection should be carried out to check the entire drive every three months INSPECTION Checklist for the inspection of drive Electrical supply to the motor should be switched off before going ahead with the inspection Remove the belt guard inspect for any damages amp clean it Check the belt if it is damaged for any external reason rectify it before placing new belts Check the pulley it should not be worn out also check the bearings lubricate them Always use installation and take up allowance Never use lever or iron bar to install the belts Install belts in sequential order Rotate pulley for at least two revolutions after installing each belt this is called as bedding of belts and helps the belt to set in the pulley groove once done check for correct pulley alignment 15 Preventive maintenance Tension the belts as per PIX norms Re tensi
22. just have to Install the belts on the drive apply sufficient tension run the belts under full load condition for 24 hours stop the drive and re tension if necessary All PIX Free Set belts are produced in the given tolerance range However belts normally shrink when stored for a longer duration the shrinkage factor depends on the climatic conditions but the belts would resume their original length once fitted and run for some time The shrinkage factor does not affect the life of the belts Free set concept Length Tolerance Chart Length Nominal Length Tolerance mm Up to 1905 mm 75 inches 1 Beyond 1905 mm 75 inches 35 Up to 3150 mm 124 inches E Beyond 3150 mm 124 inches 3 Up to 5004 mm 197 inches Beyond 5004 mm 197 inches Up to 8992 mm 354 inches 4 Beyond 8992 mm 354 inches 6 Up to 16002 mm 630 inches Installation INSTALLATION PROCEDURE FOR V BELTS 1 Check Pulleys Before installation check the pulleys for wear and for the presence of any foreign material Worn out pulleys must be replaced to ensure good contact between the pulley and the belt Worn out pulleys if not replaced LIKETHIS NOTTHIS may lead to the following s problems Ww w Early failure of the belt Belt may tend to slip off from the pulley groove Reduction in power transmission capacity Lead to excessive vibrations especially when the sides of the pulley are damaged Always check the f
23. lowance to the drives Refer Table 1 4 There should be a provision for adjusting the centre distance so that it can be varied sufficiently for easy installation INSTALLATION H Remove old belts from Reduce the centre distance the drive by installation allowances apart and apply tension as per tensioning instructions Move driver and driven pulleys INSTALLATION amp TAKE UP ALLOWANCES p Installation 99 SS 99 99 Sv Sy Sr Sv or or 55 96 05 08 05 05 05 05 05 Sc 52 Sc 02 X9I9 uonelle sul oz ov ov 05 Sc Sc Sc 02 02 02 oc 02 GL SL SL138 A 1 2155 79 Sc oz oz 02 oz 0c 02 SL SL oL 22 lqe1 0c SL SL OL 061 051 58 02 99 Sv 96 9 Sc 02 SL oL 5 5 5 ww x dn eyej 00081 gt 0008 lt 0005 gt 00521 lt 00821 gt 00001 lt 00001 gt 0008 lt 0008 gt 0069 lt 0069 5 0005 lt 0009 5 000 lt 0007 gt 0006 lt 000 gt 0 22 lt 0 22 gt 0081 lt 0081 gt 0951 lt 052 gt 0001 lt 0001 5 0 9 lt 049 5 SLE lt GLE gt 092 lt 052 gt 005 lt 000 Installation 99 Sv E n 06 00081 gt 00091 lt 55 sv 2 05 0005 gt 00521 l
24. ny obstruction Floor surface should be clean and free from oil or grease Drive Guards The drive should always be guarded properly Drive guard should be designed properly to Enclose the drive completely Facilitate proper ventilation Offer easy access to the inspection doors Easy replacement Protect the drive from environmental damages Inspection planning for preventive maintenance Periodic inspection of drive is suggested as a part of preventive maintenance Look amp listen for anything unusual A perfectly designed drive will always function smoothly and quietly Inspect the guard for vibrations if any tighten it with the base if it is loose Avoid accumulation of dust and grime on the belt guard as it will block the ventilation leading into the rise in temperature and premature failure of the belt Elevated temperature do affect the efficiency of the 18 Preventive maintenance belts A rise of 20 C in the ambient temperature above 60 C will reduce the belt life by 50 Prevent dripping of oil or grease on to the drive or the belt this is very common if the bearings are lubricated excessively If it continues for a prolonged period it will lead into the swelling of the belt resulting into premature failure Frequency of inspection Certain factors are to be considered before deciding upon the frequency of inspection they are Operating speed of the drive Operating cycle of the drive Cr
25. ollowing before installation Check the pulley groove for its correctness with the help of pulley gauges The pulley groove surface area should be smooth and free of burrs rough surface may lead to an unwanted abrasion of the belts reducing its life Installation 2 Checking pulley groove key and the shaft Before replacing worn out belts it is a must to check the fitting of the pulley with the shaft If there is any gap or play between the two replace the worn out component immediately Make sure that the pulley is properly fitted with the shaft improper fitting leads into jerks resulting into earlier failure of the drive 3 Do not mix old new belts Do not use newly purchased belt with the old belt on the same New belt drive This may lead into Old Belt Non uniform tensioning DESI uM 9 Reduction in power transfer WW Reduced working life of the new bells 9 Slippage of the old belts w w Always use a set with all new belts from the same manufacturer 4 Installing belts Never use lever to install the belt it may lead into the breakage of the cord line Using of lever invariably develops permanent 6 Installation twists leading into its turning into the pulley while running Install belt by reducing the centre distance between the pulleys reduce the distance to the extent where the belts be installed easily It is a must to provide installation and take up al
26. on the belts after an initial run of 24 48 hours Put the drive guard in place Resume electrical supply restart the drive look amp listen for anything unusual Clothing Never wear aprons or clothes which are too long or of lose fitting amp neck ties in the vicinity of belt drive the sleeves should also be rolled up to avoid any accident Use hand gloves while inspecting the sheaves as sometimes the pulleys are worn out or having sharp edges Belt inspection Check the belts for wear out Dished out Pulley inspection Inspect the sheaves for burrs sharp edges wear out eg dish out alignment 16 Preventive maintenance Alignment Alignment can be checked by using a string pulled across the face of the pulleys Misalignment can be seen in the form of a gap between the string and the pulley face Align groove like this Shafts Parallel Not like this Probable causes of misalignment Factors primarily contributing to misalignment are Motor shafts and driven machine shafts are not parallel to each other Pulleys are not properly located on the shafts Pulleys are tilted due to improper mounting As a general rule the tolerance permissible for misalignment is 1 maximum The greater the misalignment more are the chances of the belt instability increased belt wear amp belt turn over Cord tied to shaft Alignment checking using a straight
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