Not only crane slewing bearing we produced have certificated the international industry standard, but we can also meet your customization needs. Follow the makers recommendations and conduct the test at the same check points as during the initial test during commissioning in order all subsequent. The importance of slewing ring bearing maintenance in. Crane manufacturer inspection and maintenance procedures should be done in accordance to the operating manual. More than 96% of slewing ring failure could be avoided by following simple maintenance tips. For further information see our guide to mobile cranes. We provide online, timely service and you can get professional guidance on crane slewing bearing. Aug 03, 2017 single row ball slewing bearing with external gear applied for aerial platform.
Alatas middle east completed a critical dock crane recovery after a slew bearing flange welding failure. Slew ring bearing for excavators and tower cranes, india. Largesize and heavyload slewing bearings, which are mainly used in heavy equipment, comprise a subgroup of rolling bearings. Failure of bolts or the slew roller bearing can and has led to loss of operator, crane from its mount. Failure to do so could result in corrosion issues and may affect the life of the bearing. Pdf combined failure diagnosis of slewing bearings based on. Use a solvent that will not damage the rubber seals of the bearing.
Pdf largesize and heavyload slewing bearings, which are mainly used in heavy equipment, comprise a subgroup of rolling bearings. Failure to maintain crane stability is one of the key factors associated with serious crane incidents. The raceway diameter of the slew bearing rothe erde make is 3965 mm. Tensile stresses can be very high in tightly fitted bearing components. About fenghe slewing bearing working today to shape tomorrow. These high standards also continue with the choice of suppliers and through aftersale service. Owing to the complexity of the structures and working conditions, it is quite challenging to effectively diagnose the combined failure and extract fault features of slewing bearings. When lubrication is inadequate, surface damage in the form of roughening or waviness occurs. Macgregor inspection and service information manual. Finite element methods fem as well as failure mode effects.
Analysis of particles of dried grease from the slew bearing of no. Rollix slewing ring participate to the construction of thousands of buildings everyday all around the world with total safety. Slewing bearings must always be moved during crane trans portation using. Slewing bearings comprise an inner ring and an outer ring, one of which usually incorporates a gear. General technical information slewing bearings global bearing. Critical dock crane recovery after slew bearing flange. Following a number of analyses of the lubricating grease from the bearing of a pipe transfer crane. Lqs prevent slew bearing failure this is a case history where it has been demonstrated that the work carried out in collaboration with the client brings about improved reliability and, as in this case, early warning of asset failure. Slewing bearing crane rack and pinion crane effer truck.
The top countries of suppliers are china, singapore, from which the percentage of slewing bearing truck crane supply is 99%, 1% respectively. Types of failure bearing failures main cause reference failures failure details rolling fatigue flaking. Pdf combined failure diagnosis of slewing bearings based. In this study, a method was proposed to denoise and classify the combined failure of slewing bearings.
Excavator swing bearing replacement installing a swing bearing on a cat 311b duration. Lack of inspectionmaintenance crane was 16yrs old fatigue failure of slew ring connecting bolts the common practice of test lifting unknown loads which in some cases exceeded capacity of crane throughout its life span contributed to chronic stress on the connecting bolts. Bearing failure defects in the appearance of bearings are referred to as bearing failures. On the other hand, the slewing ring system allows the crane to rotate continuously and without limits. Remanufacturing can substantially prolong the service life of the bearing, reducing your costs and lead times. General general the fundamental and foremost rule in all work with hydraulic systems and components is absolute cleanliness. The practical signal verification conducted on the slewing bearing of a practical port crane is demonstrated in section 3. Take care not to get any solvent into the slew bearing. Finite element methods fem as well as failure mode effects analysis fmea.
Quality and reliability all production and assembly processes are documented in a computersupported operating data recording system. Avoid slewing ring bearing failure with these six maintenance. Once the failure occurs, the stability of the whole crane will be affected. Slew bearing failure analysis done to analyse the exact causes and problems occurred during the operation of slew bearings. Rollix slewing rings comply with all major classification societies requirements like dnv, abs, api, gl, bv, lloyds for examples, including ice classifications. As the load reached the side of the ship, there was a violent jolt and a bang as the slew bearing failed, then the crane fell from its pedestal into the port tweendeck of no. Timken bearing damage analysis with lubrication reference guide. Single row ball slewing bearing with external gear applied for aerial platform. Staff engineer walker process equipment division of mcnish corporation may 2006 slewing is defined as the rotation of an object about an axis.
Three row roller slew ring bearing is available in the following types. The crane can also easily slew 360 degrees without fouling a leg. The importance of slewing ring bearing maintenance in lifting. Since 1912, messinger bearings has been focused on engineering and manufacturing custom bearings that provide the best solution for our customers applications. In slewing ring bearings, a heavyduty, extreme pressure grease is required. Largesize and heavyload slewing bearings, which are mainly used in heavy. In order to prevent seawater from causing premature failure of bearings, the sealing of the bearing uses a doublelip rubber sealing structure. Offshore bearing, crane bearing, slewing ring bearing rollix. Effer can satisfy all your needs, both if you want a rack and pinion crane and a slewing bearing crane. Deck crane glbe302522425gr instruction manual macgregor. The measurement could be done from the inside and outside of pedestal. The slew bearings shall be mounted in an unloaded condition. How to extend the life of your slewing ring bearings kaydon bearings. Dont hesitate to get in touch with us if you are interested in crane slewing bearing, we wont let you.
Crane slew ring bearing manufacture and installation. When a bearing does fail, it is important to determine the exact cause so apprcipriate adiusfments can be made. Table 21 describes bearing failures, first assigning a general term to each type of failure, then adding more detailed classifications. Before final assembly takes place, the three row roller bearings undergo stringent checks for axial and radial tilting clearance. The raceways of three row roller slew ring bearing are hardened by our inhouse induction hardening machine to about 5658 hrc. Public works does cover a wide range of applications, since its very beginning rollix has developed specifics slewing rings that suits all the particularities of those applications. Any static overload or severe impact can cause brinelling. Apply a liberal shot of extremepressure grease to the fittings around the bearings circumference at intervals recommended in the operators manual. Further information and explanations can be found in the instruction manual. Premature failure is a common fate for largediameter e. Lowspeed and heavyload slewing bearings are applied broadly for major mechanical. In this study, a method was proposed to denoise and classify the combined failure of. Here you can discover the highlights of our extended product range as well as a selection of our services. The crane slew ring connecting bolts had broken when the.
Replacement of slew ring bearing i would like to know if anybody has an experience in replacing slew bearing of a stacker reclaimer 30 mtr boom without dismantling the luff superstructure. Condition evaluation and damage assessment of the cracked area, engineering and design of safety brackets to secure the crane revolving structure for separation with the land connected part. Oil and gas case study lqs prevent slew bearing failure. The slewing bearing device is an important component connecting the rotating part and the fixed part of the crane. Port cranes play an important role in the development of the port. Five common causes of crane failure the maritime executive. Messinger possesses unique large bearing manufacturing capabilities to meet the specifications and delivery requirements of heavy industry. Inadequate lubrication is the most common cause of premature bearing failures. As a wellestablished manufacturer of slewing bearings, liebherr specialises in developping individual bearing solutions for all types of scenarios. Messinger bearings other rollerball styles messinger. Many slew bearing condition monitoring techniques are available. Combined failure diagnosis of slewing bearings based on mckd. Together with attachment holes in both rings, they enable an optimized power transmission with a simple and quick connection between adjacent machine components. Crane slewing bearings manufacture and installation alatas offers high quality slewing bearings at reasonable prices and with delivery times of 60 to 90 days.
Quality control is carried out by alatas personnel from the forging to the packaging of the finished product according to class procedures. A slew bearing system includes a first bearing ring and a second bearing ring concentrically positioned relative to each other forming at least upper and lower raceways there between, a plurality of bearing rollers positioned in each raceway between the first bearing ring and the second bearing ring, a plurality of delivery nozzles capable of delivering an air and oil mixture into the raceways. Two checkpoints should be chosen on the pedestal at the circumference close to the revolving side shell of the crane see the drawing above normally at the fwd and aft of pedestal. No matter your business, your cranes need bearings that are able to handle heavy loads and harsh environments so that your cranes. The proven kingpost design ensures the crane cannot separate from its mount because of slew bearing failure. A wide variety of slewing bearing truck crane options are available to you, there are 839 suppliers who sells slewing bearing truck crane on, mainly located in asia. The main factors that affect crane stability include. Liebherr product catalogue slewing bearings 3 list of content 1 highquality slewing bearings for all applications 4. A way to counter this is to apply a controlled remanufacturing process before any major damage or bearing failure occurs. Other advantages of the seatrax slew bearing arrangement include. Safety investigation into the failure of a deck crane on board the. Examination of th6 failure mode ohn reveals the true cause of failure.
The unique design of slewing ring bearings allows for combination loads to be handled quite efficiently. As a public company for slewing bearing designing, machining, assembling, fabricating and repairing, we provide a turnkey project for all your requirements. Our slewing rings are carefully packed wrapped in order to avoid any damage during transport. This causes permanent deformation in the local area, leading to early failure.
Public works, special bearing, slewing ring bearing rollix. However, whenever a load is applied that exceeds the bearing capacity, permanent deformation could occur, again leading to a premature failure. After installing the slewing bearings, we put it on the vertical lathe to check its rotation and noise. The slewing bearing rocking test should be done periodically for the bearing wear tracking and early failure detection. Attempting to remove such components by cutting the cone inner race may.
Safety investigation into the cargo deck crane failure on board the. If slew bearings are not properly specified for their required service use, monitored correctly, and looked after in service, then over a period of time. For the crane to pivot through a full 360 degrees of rotation about a central pedestal, the slew bearing provides the primary operational design requirements and sustains the full load of the crane, its payload and counterbalance. Failure mode calculations only required upon request of purchaser api 7 edition addresses gross overload using failure mode assessment requires failure mode results to be provided to the customer protects the crane operator in the event of an unbounded gross overload supply boat entanglement if failure mode cannot be met. On floating applications, the bearing is subjected to load cycles from the crane selfweight and installation motions even when the crane isnt. Some mobile cranes, for example a nonslewing mobile crane, can also carry a load while moving known as mobiling. Effer rack system ensures a crane rotation angle exceeding 360, that on average, is one of the widest in its category. China crane slewing bearing manufacturers, crane slewing. Severe brinell marks can cause premature fatigue failure. Roller bearing subject to full overturning moment from weight of load, the crane itself and boom. Condition monitoring for the safe operation and life. Pdf largesize and heavyload slewing bearings, which are mainly used in heavy equipment. The marine crane turntable bearings in the course of work is very vulnerable to seawater and other external objects. A mobile crane can be set up in a range of locations and environmental conditions.
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