Blocksaver

Bit holding systems

Joy JS Blocksaver Mark I

  • Ease of changing sleeves reduces downtime and improves productivity
  • Speed of changing sleeves promotes regular maintenance and reduces downtime
  • Black oxide coating prevents corrosion and extends sleeve life
  • Optional hard facing extends sleeve life in tough conditions, lowering cost of ownership
  • Only a hand pump is required - which is smaller and lighter than the hydraulically powered sleeve extractor - reducing handling of larger removal tools

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The genuine Joy blocksaver:

  • Decreases the time it takes to maintain your sleeves. Easy extraction can save you time to remove and rotate the sleeves
  • Lowers costs through extended life. By carrying out routine sleeve maintenance, it will increase sleeve life and can extend drum life by changing damaged and worn sleeves
  • Increases productivity. Cutting productivity comes from increased utilization due to less downtime spent on unplanned drum maintenance. 
The JS Blocksaver Mark I bit holding system incorporates a method of hydraulically extracting press fit sleeves from the block where the stepped sleeve acts as its own hydraulic cylinder. Using a simple hand pump, the Blocksaver system allows for easy and fast removal of sleeves, reducing maintenance delays and increasing productivity. The JS Blocksaver Mark I system is based on the JS35/30 bit holder system, giving users all the advantages of the JS series bit holder in productivity, lower operating costs and safety. 

Understanding the sleeve removal process

  1. Clean away all dirt from around the pressure release hole and remove the soft seal plug.
  2. Screw in the pressure adapter and tighten to seal on nose of adapter.
  3. Connect the hydraulic hand pump. 
  4. Cover the assembly with a cloth to catch any oil that may be expelled on sleeve's release.
  5. Steadily apply pressure with the pump until the sleeve is released.

As a guide to tightness, a new sleeve fitted into a new block should release by hydraulic pressure at between 4000 and 9000 lbf/in2 (275-620 bar).