Material spectra should not affect slewing ring life.

For 1. you have to create access to the bearing & release the operating forces

For 2. after you have examined the supplier base and matched your life expectancy demand against the delivery time.

For 3. soon after you have bought the bearing & have confidence in the installation facility.

https://forum.bulk-online.com/showthread.php?t=6351 might be a good place to start looking. Plenty of background issues were addressed then.

Since your failures took place close together it appears that the operating conditions were right but the bearing rating was inadequate. The earlier thread suggested repositioning the ring & that might help. You will still need a jacking arrangement anyway so that must be your starting point. The jacking fixture is also necessary to accomplish item 1 of your question list.

Items 1 & 2 are rather interdependent & you must consider the remaining life expectancy of your machines as the prime factor. Another influence will be the availability of the specialist services (mentioned in the earlier thread) alongside the shipping/production schedule. You need to prepare your emergency reclaim equipment to cater for this outage.

Slewing ring delivery times used to be the governing factor in a stockyard machine design/quotation. Cranes have the major pull on the manufacturers & stockyard equipment is rightly shunted on to their sidelines because of the inconvenient nature of the enquiries. This present economic scenario facilitates large scale maintenance work. ■

Almost 11 years in your applcation.■

Mr.RK,

From your post I understand you have replaced the bearings and now still you are hearing abnormal noise. Have you replaced on both the reclaimers?

I feel that 11 years life is less.

What was the reason for failure?

Are you doing grease analysis? It will give you good indication about bearing condition.

What happened to your long travel drive shafts shearing in reclaimer?

Is it in the same reclaimer? Has it been fresh or second hand reclaimer?

Please give your feedback.

Giving feed back will help others to learn or advise. ■

Thanks for remembering. Please take photos sequentially and post them for better under standing.

What is the opinion of bearing's life as per the supplier? What is the guarantee he gives?

What happened to your long travel drive shafts shearing in reclaimer?

Is it in the same reclaimer? Has it been fresh or second hand reclaimer?

Rgds, ■

Dear Mr. RK,

Our LYC bearing group is a leader manufacturer in Chinese bearing industrial. Really sorry to hear that the problem bearing is made in China. The slewing bearings life is calculated according the details operation condition, I know that a same slewing bearing can work 860000 round, but at other operation condition its life is only 340000 round, just due to different axial load and moment.

We can give you a hand on the slewing bearings solution, if you would like, please give me your contact information, and I will send you some infomation regard to slewing bearings life and maintain manual. the mounting and maintain are have effect on its life.

If you don't settle the problem until now, please contact us freely.

Look forward to hearing from you soon.

Best Regards,

Zhang Xueshi (Molly)

.......................................................

LuoYang Bearing Corp.(Group)

96 JianShe Road, JianXi District,LuoYang, HeNan, China.

Tel: 0086 379 64930500

Fax:0086 379 64912225

Email: eur@lycbearing.com

MSN : xueshi-bearing@hotmail.com

website: www.lycbearing.com ; www.lycbearings.com ■

I send our slewing bearing manual to you e-mail below, please check it.

[email]ramesh.yadaguru@jsw.in ■