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STT293 CONCISE TOWER CRANE MANUAL

-48-

EURC1.0ENG

CHAPTER 2. WINCH UNIT

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(909) 222-0202 www.reliablecraneservice.com 260 North Smith Ave. Corona, CA 92880

C R A N E S E R V I C E

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Summary of Contents for STT293

Page 1: ...CONCISE MANUAL TOWER CRANE STT293 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 2: ...69S MAST 36 1 3 4 DIMENSIONAL FEATURES OF THE FOUNDATION ANCHORS 37 1 4 COUNTER JIB BALLAST 38 1 4 1 INTRODUCTION 38 1 4 2 COUNTER JIB BALLAST DIMENSIONS 39 1 5 REEVING SEE 1 5 1 1 44 1 5 1 FROM DUAL REEVING TO SINGLE REEVING 44 1 5 2 FROM SINGLE REEFING TO DUAL REEFING 46 CHAPTER 2 WINCH UNIT 48 2 1 EXPLANATION OF THE SYMBOLS 49 2 2 COMPOSITION OF THE WINCH UNIT 49 2 3 OPERATING PRINCIPLE 50 2 4 ...

Page 3: ...PTER 4 TROLLEY WINCH 61 4 1 SYMBOLS 62 4 2 TROLLEY BRAKE ZIE FIG 6 4 1 63 4 2 1 DESCRIPTION 63 4 2 2 PROGRAMMED MAINTENANCE 65 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 4: ...STT293 CONCISE TOWER CRANE MANUAL 9 EURC1 0ENG CHAPTER 1 TECHNICAL DATA 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 5: ...OTE The mast sections are also available in 5500 mm or standard 3000 mm lengths 30m 10 3t 3 0m 3 8m 16 2m 70m 54m 60m 64m 44m 40m 50m 4 6t 7 0t 8 0t 5 3t 4 0t 3 7t 3 0t 2 7t 35m 9 0t 20 2m 3 6m 18t 76 0m 74m 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 6: ... 8 80 7 53 6 33 5 69 4 92 4 51 3 99 3 70 IV 15 7 18 00 8 30 7 00 5 84 5 20 4 43 4 02 3 50 60 II 29 1 9 00 8 80 7 51 6 34 5 70 4 93 4 52 4 00 IV 15 7 18 00 8 40 7 08 5 95 5 30 4 52 4 10 54 II 29 6 9 00 8 90 7 57 6 45 5 80 5 02 4 60 IV 16 3 18 00 8 60 7 44 6 30 5 62 4 80 50 II 31 0 9 00 9 00 7 94 6 80 6 12 5 30 IV 18 2 18 00 10 10 8 53 7 28 6 50 44 II 35 0 9 00 9 00 9 00 7 78 7 00 IV 18 5 18 00 10 3...

Page 7: ...19 6 6 22 6 7 25 6 8 28 6 9 31 6 10 34 6 11 37 6 12 40 6 13 43 6 46 6 14 6x6m YZ86X H m L69B1 3 0m 2 0x2 0m 2 1m 20 19 64 6 61 6 58 6 18 55 6 17 16 52 6 49 6 15 68 33 33 40 41 42 43 44 44 43 42 41 40 28 28 28 28 32 31 30 29 32 31 30 29 32 31 30 29 20 21 20 21 20 21 18 18 18 18 17 17 17 17 L69B1 2 0x2 0m 67 65 64 66 H 206 65m 55 56 53 52 54 45 57 H 56 55 52 53 54 45 H 121 5m 170 65m 157 5m 85 5m 19...

Page 8: ...um height Crane mechanism specifications Table 1 1 1 3 Name code m min t m min t kW Hoisting 18 t 75LFV45 0 38 0 46 0 76 9 00 6 00 3 00 0 19 0 23 0 38 18 0 12 00 6 00 550 m 550 m 75 Trolleying 7 5DFV08 0ĺ69 7 5 RTC290 0 0 8 rpm 2 x 145 Nm Slewing YMD100 0 0 8 rpm 2x10 5 Travelling RT 12 5 25 4x2 6 5 2 Please consult us 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 C...

Page 9: ...e mast sections can be supplied in 5500 mm or standard 3000 mm lengths 30m 10 3t 3 0m 3 8m 16 2m 20 2m 3 6m 12t 76 0m 74m 70m 54m 60m 64m 44m 40m 50m 4 6t 6 5t 7 5t 5 3t 4 0t 3 7t 3 0t 2 7t 35m 8 8t 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 10: ... 6 0 6 00 6 00 6 00 5 69 4 92 4 51 3 99 3 70 IV 22 1 12 0 8 37 6 98 5 84 5 20 4 43 4 02 3 50 60 II 42 0 6 0 6 00 6 00 6 00 5 70 4 93 4 52 4 00 IV 22 3 12 0 8 46 7 06 5 95 5 30 4 02 4 10 54 II 42 7 6 0 6 00 6 00 6 00 5 80 5 02 4 60 IV 23 2 12 0 8 88 7 43 6 26 5 62 4 80 50 II 44 8 6 0 6 00 6 00 6 00 6 00 5 30 IV 25 9 12 0 10 10 8 50 7 17 6 50 44 II 44 0 6 0 6 00 6 00 6 00 6 00 IV 26 4 12 0 10 35 8 7...

Page 11: ...8 28 6 9 31 6 10 34 6 11 37 6 12 40 6 13 43 6 46 6 14 6x6m YZ86X H m L69B1 3 0m 2 0x2 0m 2 1m 20 19 64 6 61 6 58 6 18 55 6 17 16 52 6 49 6 15 29 65 9 26 65 23 65 20 65 14 65 11 65 8 65 17 65 5 65 20 21 20 21 20 21 18 18 18 18 17 17 17 17 L69B1 2 0x2 0m 67 65 64 66 H 206 65m 55 56 53 52 54 45 57 H 56 55 52 53 54 45 H 121 5m 170 65m 157 5m 85 5m 19 16 3 4 1 2 5 19 16 16 49 5m 3 4 1 2 3 4 1 2 5 5 98 ...

Page 12: ...est jib and at maximum height Crane mechanism specifications Name Code m min t m min t kW Hoisting 55LFV30 0 44 0 53 0 88 6 0 3 0 1 5 0 22 0 27 0 44 12 0 9 0 3 0 570 m 570 m 55 Trolleying 7 5 DFV08 0ĺ69 7 5 Nm Slewing RTC290 0 0 8 rpm 2x 145 Nm YMD100 0 0 8 rpm 2x10 5 Travelling RT 12 5 25 4x2 6 5 2 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 13: ...he entire crane with indication of the most important dimensions The crane is shown in three parts Foundation anchors and undercarriage Mast composition Range and jib length Based on the provided dimensions you can prepare the assembly of the crane ATTENTION The provided dimensions do not take account of sagging under load or any manufacturing tolerances 909 222 0202 www reliablecraneservice com 2...

Page 14: ... CONCISE TOWER CRANE MANUAL 19 EURC1 0ENG 1 2 2 DIMENSIONS 1 2 2 1 TOTAL CRANE DIMENSIONS Fig 1 2 2 1 1 P P P P P P 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 15: ...5 Mast section 15 Hook assembly 6 Telescoping cage 16 Counter jib 7 Climbing frame mechanism 17 Hoist mechanism 8 Fixed slewing ring section 18 Electric control system 9 Rotating slewing ring section 19 Counterweight1 NOTE The mast sections are also available in 5500 mm lengths 1 To be supplied by user 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 16: ...1 0ENG 1 2 2 2 DIMENSIONS EN WEIGHT PARTS 1 2 2 2 1 Undercarriage Fig 1 2 2 3 1 1 Dimensions and weight 1 2 2 2 2 Foundation anchors Fig 1 2 2 2 2 1 NJ 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 17: ...STT293 CONCISE TOWER CRANE MANUAL 22 EURC1 0ENG 1 2 2 2 3 Wheelbase complete Fig 1 2 2 2 3 1 NJ 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 18: ...foundation cross 1 2 2 2 4 1 Foundation cross composition Standard type YZ86X refer to pg 59 YZ69H refer to pg 59 ATTENTION Central ballast blocks and bogies are not included in the weight 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 19: ...am for chassis Side beam for chassis Strut Main mast Diagonal support Ladder Fig 1 2 2 2 4 2 1 NOTE The mast sections main mast are also available in 5500 mm lengths NJ NJ NJ NJ NJ NJ 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 20: ...cting anchor Resting platform Short ladder Long ladder Ladder support Fig 1 2 2 2 5 1 NOTE The ladder sections main mast must be modified if 5500 mm mast lengths are used NJ NJ NJ NJ NJ NJ NJ 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 21: ...bing cage Front Upper side platform Rear upper platform Climbing cage Front lower platform Lower side platform Rear lower platform Support Connection Safety connection Ladder Fig 1 2 2 2 6 1 NJ NJ NJ 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 22: ...MANUAL 27 EURC1 0ENG 1 2 2 2 7 Slewing unit Lower slewing unit Upper slewing unit Monorail Trolley Fig 1 2 2 2 7 1 NJ NJ NJ NJ NJ 2454 kg 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 23: ...NJ NJ NJ NJ NJ 1 2 2 2 8 Mast top Fig 1 2 2 2 8 1 Mast top Cabin Cabin platform Platform Upper ladder Lower ladder Housing Connection Handrail Handrail NJ NJ NJ NJ 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 24: ...RANE MANUAL 29 EURC1 0ENG 1 2 2 2 9 Jib Jib T2112 3 Jib T2112 4 Jib T2112 5 Jib T2112 6 Jib T2112 7 Jib T2112 8 NJ NJ NJ NJ NJ NJ NJ 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 25: ...se T2112 11 Pulley support Strut Pulley support Trolley winch Jib TP29312 5 Use when the jib length is 35m it s special configuration NJ NJ NJ NJ NJ NJ NJ NJ Fig 1 2 2 2 9 1 5238 2350 1400 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 26: ... and hook Front trolley support Rear trolley support Safety support Tensioner Front lock Rear lock Hook unit Special applications hook Fig 1 2 2 2 10 1 NJ NJ NJ NJ NJ NJ NJ NJ 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 27: ...2116 2 Counter jib ballast support T2116 3 Hoisting winch Lifting device for service Handrail Handrail Fig 1 2 2 2 11 1 NJ 3 5 9 0 2879 19596 NJ NJ NJ NJ NJ NJ 2 3 1 0 1295 2510 6 2 0 3207 2647 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 28: ...rs are minimum values to be observed taking account of the stability requirements of the crane Please contact us in case of deviating conditions 2 2 Jinlong Europe Zandvoorstraat 10 6 2800 Mechelen Belgium Tel 32 15 28 54 54 Fax 32 15 20 96 80 and Jinlong Europe UK Ireland 2nd Floor Titan Court 3 Bishop Square Hatfield AL10 9NA Hertfordshire U K Tel 44 1707 226 522 Fax 44 1707 226 001 909 222 0202...

Page 29: ...ansport The difference between respectively the diagonals and the bearing surface heights may be at the most 2 mm Install the foundation anchor on the reinforcement and adjust by means of filling plates Check perpendicularity in both directions after assembly of the lower mast section on the framework Adjust if necessary Pour the concrete block and wait until it is completely hardened before remov...

Page 30: ... 60 54 50 44 40 35 30 74 70 64 60 54 50 44 40 35 30 Mv 4296 4370 4591 4522 4528 4576 4795 4773 4773 4773 5132 5033 4861 4846 4660 4544 4228 4118 4118 4118 Fh 42 42 42 42 42 41 41 41 41 41 152 151 150 150 148 148 147 146 146 146 62 6 5 20 Fv 1207 1194 1178 1158 1125 1122 1085 1072 1072 1072 1027 1014 998 978 945 942 905 892 892 892 Mt 503 503 503 503 503 503 503 503 503 503 0 0 0 0 0 0 0 0 0 0 Tabl...

Page 31: ...878 864 845 811 803 814 801 Mv 3373 3222 3236 3129 3081 3097 3346 3373 3121 2850 2480 2458 2238 2136 1837 1786 Fh 34 34 34 33 33 33 32 32 124 123 121 121 118 117 115 115 46 6 8 P 968 965 951 932 898 889 901 888 848 845 831 812 778 769 781 768 Mv 3151 3002 3018 2913 2870 2886 3135 3163 2362 2098 1740 1722 1522 1533 1742 1786 Fh 31 31 31 31 30 30 29 29 112 111 110 109 106 105 104 103 41 1 7 P 934 93...

Page 32: ...o form a 2 by 2 m square based on the dimensions of the mast to be erected see Fig 1 3 4 1 The distance between the topside of the mounting plate and the topside of the foundation block must be 150 mm Fig 1 3 4 1 ATTENTION Cutting or reducing the reinforcement in the foundation is prohibited 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 33: ...ance with Fig 1 4 2 1 During installation care must be taken to ensure that they cannot be chipped or become loose while operating the crane Composition and structural dimensions are dealt with in 1 4 2 The admissible tolerance is 50 0 kg per block To allow for concrete density changes alter dimension X to bring the blocks within the indicated tolerance We recommend weighing the concrete blocks an...

Page 34: ...20 2 20 2 20 2 20 2 20 2 20 2 Blocks 2A C 2A B C 3A C 3A B 4A C 4A C 5A 5A C 5A B C 6A During working and telescoping Weight kg 9000 11000 13000 14000 17000 17000 20000 21000 23000 24000 Block type Density t m3 Weight kg Tolerance A 2 4 4000 1 B 2 4 2000 2 C 2 4 1000 2 Fig 1 4 2 1 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 35: ...STT293 CONCISE TOWER CRANE MANUAL 40 EURC1 0ENG Counterweight A 4000 kg Figure T742719 1 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 36: ...STT293 CONCISE TOWER CRANE MANUAL 41 EURC1 0ENG Counterweight B 2000 kg Figure T742719 2 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 37: ...STT293 CONCISE TOWER CRANE MANUAL 42 EURC1 0ENG Counterweight C 1000 kg Figure T742719 3 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 38: ...STT293 CONCISE TOWER CRANE MANUAL 43 EURC1 0ENG 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 39: ...the jib foot and fasten it Lower the hoist hook down the ground vertical position Remove the connecting pin 8 connecting arm 5 and single hook block 4 Reinstall the connecting pin 8 on the single hook block and secure it with cotter pins Fig 1 5 1 1 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 40: ... trolley This concludes the transition from dual 4 rope reeving to single 2 rope reeving Fig 1 5 1 2 ATTENTION If operating a significant amount of time with single reeving the following periodic maintenance must be performed Convert to dual reeving let the trolley run a few times over the entire jib length while veering and hoisting the load hook over the entire hoisting height Revert to single 2...

Page 41: ... operating panel Connect both trolleys with the connecting pin 8 and secure it with the cotter pins 9 Lower the single hook block 4 down to the ground Connect both hook blocks 4 and 3 by means of the fittings 8 9 and 10 see Fig 1 5 2 1 This concludes the transition from single to dual reeving Fig 1 5 2 1 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 42: ... The crane is designed to work with single reeving up to the maximum freestanding height In case of higher heights an imbalance can occur Please contact us on this In that case the hook blocks must be ballasted which will lead to diminished hoisting capacities 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 43: ...STT293 CONCISE TOWER CRANE MANUAL 48 EURC1 0ENG CHAPTER 2 WINCH UNIT 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 44: ... the following components See Fig 2 2 1 Frequency controlled motor 1 Brake mechanism 2 Gearbox 3 Hoisting drum 4 Limiter 5 Motor ventilator 6 Support base 7 Fig 2 2 1 Speed code D for high speed motor Load capacity of single wire Frequency controlled Motor power in kW 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 45: ...rsion of the 3 phase supply through an AC transformer to a frequency controlled supply voltage Schematic electric diagram XL Joystick PLC Programmable logic controller Lfa Brake PG Transformer LM Hoisting motor frequency converter 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 46: ...tion Parameter Supply voltage PLC voltage L N AC 220V Control panel Dust free ambient temperature and humidity 0 C 55 C 30 85 RH I O voltage Operating voltage Input output voltage DC24V Connecting conditions Actual connecting parameters Battery backup Replace the batteries regularly 3 year 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 47: ...STT293 CONCISE TOWER CRANE MANUAL 52 EURC1 0ENG CHAPTER 3 SLEWING MECHANISM 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 48: ...ed Slow down gradually instead of stopping the load abruptly with the slew brake The slew brake may only be used to position the jib during hoisting at wind speeds 13 m s 46 km h Avoid simultaneous slewing and hoisting to prevent damage to the hoist rope rope twisting risk Couple Nm Eddy current Voltage timing Slewing mechanism 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona C...

Page 49: ...rection Electrodynamics coupling brake to perform the speed changes A gearwheel in which the clutch engages directly on the slewing ring Safety brakes mounted on the electrodynamics coupling brake Techno dynamo for speed control Slewing limiter The crane can be put in weathervaning both manually and electrically 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SE...

Page 50: ...means of the control box AT STANDSTILL The power supply to the motor is switched off power is supplied to the inductor of the electrodynamic brake and the jib is brought to a stop The safety brake only locks when in case of necessity the operator presses the slewing brake button XRFS ATTENTION Stopping the jib by counter slewing is prohibited At the end of the workday the jib must be placed in wea...

Page 51: ...RANE MANUAL 56 EURC1 0ENG 1 Motor 2 Gearbox 3 Weathervaing smechanism 4 Slewing ring 5 Limit switch 6 Eddy current brake Fig 3 2 2 1 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 52: ...ted through the amplifier IC to a single and three phase AC voltage that directly controls the driving motor The slewing direction is controlled through a separate signal IC IC IC IC V Contactor counterclockwise direction Contactor clockwise direction Adjustable 3 phase AC supply Voltage feedback RP Eddy current voltage output 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA...

Page 53: ...STT293 CONCISE TOWER CRANE MANUAL 58 EURC1 0ENG Wiring diagram RM RD RDi A B C AC48V RRa RG 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 54: ... be stopped and its cause must be eliminated Table 3 4 1 Operation Normal Abnormal Slewing movement from 0 position on joystick Slewing starts gradually up to its maximum speed Slewing starts abruptly The tower deforms Slewing movement towards 0 position The slewing movement slows down and stops after 7 10 seconds Slewing stops instantly The tower deforms Shunt bridging Free slewing Slewing stops ...

Page 55: ...and joystick are not compatible or are incorrectly adjusted with reference to the resistance O R 2 Check if the inverter is intact and operates properly within the parameters Check the connections of each part for damage and or improper tightening Check if the control box still works within the given parameters 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SER...

Page 56: ...STT293 CONCISE TOWER CRANE MANUAL 61 EURC1 0ENG CHAPTER 4 TROLLEY WINCH 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 57: ...ccording to the distance to be run Increase and decrease speeds gradually Composition of the trolley winch Fig 4 1 1 1 Outside support board 2 Reductor 3 Drum 4 Motor 5 Limiter 6 Brake 1 Couple Frequency controlled Motor capacity HP 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 58: ...e active range is automatically adjusted Fig 4 2 1 1 1 Fixed brake disc 2 Two sided brake disc 3 Brake clearance 4 Spindle 5 Spring 6 Pressure disc 7 Electromagnet 8 Brake pressure spring 9 Spring pressure regulating cylinder 10 Brake cylinder joke 11 12 13 Fittings 14 Cover 15 Brake complete 16 Protection 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona CA 92880 CRANE SERVICE ...

Page 59: ...is attracted and the brake pressure spring 8 is pressed in By this the brake discs 1 and 2 open up Brake clearance Check the brake clearance for soiling oil grease Normal brake clearance is 0 8 to 1 2 mm Brake moment adjustment Factory set Releasing the brake manually The brake can be released manually by loosening the brake yoke 9 and 10 ATTENTION Working with a manually released brake is not per...

Page 60: ...rmally 0 8 to 1 2 mm Attention replace brake discs before they are completely worn Check if there is any foreign matter in the brake and if it is free from oil and grease ATTENTION The brake must immediately be inspected if It does not work properly It is overheating Abnormal vibrations are noticed Braking torque is insufficient 909 222 0202 www reliablecraneservice com 260 North Smith Ave Corona ...

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