Slewing Bearing Load Test on Kyoritsu Kikai Crane

Alatas ServiceField Service
Crane ManufacturerKyoritsu Kikai
Crane TypeSWL 0.9T x 6.6M Provision Crane

This changeout and slewing bearing load test for a Kyoritsu Kikai provision crane was carried out by Alatas Singapore on the Starboard side of a davit crane had failed.

The Kyoritsu Kikai SWL 0.9T x 6.6M was out of order for more than two years due to the starboard davit crane had failing.

It was not possible to arrange a qualified crane service company that could arrange a crane bearing change-out on anchorage, and without the need for a shore-based crane.

Our solution was to lift up the crane using a specially constructed modular A-Frame, that could be assembled onboard without lifting aid.

Job Scope for Slewing Bearing Load Test for a Kyoritsu Kikai

  1. Assembled the A-Frame and shifted to STBD side from port side of vessel
  2. Placed A-Frame on top of crane and erected the staging around STBD crane pedestal
  3. Secured the crane by chain blocks (No crew available to assist)
  4. Removed slewing bearing outer and inner bolts and nuts
  5. Removed the electrical cables from junction box 1 to slewing column
  6. Removed slewing gearbox foundation bolts and slewing gearbox
  7. Brought down damaged slewing bearing
  8. Cleaning bearing landing flanges by power brushing, on slewing column and on base column flange surfaces
  9. Applied new EP 2 grease to the new slewing bearing before installation
  10. Installed new slewing bearing (Customer supplied) tighten all inner and outer slewing bolts (415 Nm) by using Alatas supplied torque wrench
  11. Fixed back slewing gearbox and electrical cables
  12. Tested operation, slewing lift/right limits, hoist up anti two block limit, witnessed by Class NK surveyor, Superintendent, Captain & Chief Engineer
  13. Measured new slewing bearing deflection with and without load
  14. Conducted load test and overload test (SWL 0.9 ton and proof load of 1.125 ton), as witnessed by the Superintendent and Chief Officer
  15. Dismantled A-Frame, scaffolding, tools and materials
  16. Arranged all materials to be ready for offloading

After being two years out of operation, the crane has been fully commissioned and recertified by Alatas and is ready again for unrestricted cargo operations.

Alatas issued a full service report, including bearing axial clearance measuring protocol, crane load test protocol and crane certificate. ILO152 Form 2 is available as well.


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