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Engineering Bulletin #2020308
Stop Block Cylinder Upgrade

Available for Simpson Harley® controllers and bond determinators.

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Items can be emailed to you or submitted for a personalized quote.
Affected Products: Affected Part: Replacement Part:
2500 Simpson Harley 51.036.1.151.299.1.1 - Stop Block Cylinder
2502 Simpson Hartley51.036.1.1 51.299.1.1 - Stop Block Cylinder
2550 Simpson Bond Determinator 51.036.1.151.299.1.1 - Stop Block Cylinder
2552 Simpson Bond Determinator 51.036.1.151.299.1.1 - Stop Block Cylinder
Current Situation

The stop block retrofit kit was designed to address customer reports of excessive stop block cylinder repairs due to premature failure of the cylinder rod and cylinder wall ruptures.

Simpson Solution

The original stop block cylinder has been upgraded with a larger cylinder to strengthen the design. An upgrade kit has been designed to completely replace the original cylinder design.

Conversion Kit

The stop block conversion kit replaces the original part and consists of:

  • A new air cylinder (1-1/4″ Bore – 7/16″ Dia. Rod versus 3/4″ Bore – 1/4″ Dia. Rod) which is bracket mounted at both ends.
  • Cylinder Mounting Block
  •  Stop Block
  • Fasteners and Fittings required for installation
  • Drawings and instructions for installation

Installation requires removal of existing stop block assembly, drilling of new mounting holes and assembly of new components. Estimated time for completion – 1 hour.

Upgrade Details  
  • Model:
  • Part Number:
  • Conversion Kit Number:
  • Replaces Part Number:
 
  • Model:
    2500 Simpson Harley
  • Part Number:
    51.299.1.1
  • Conversion Kit Number:
    2552.143.501.4
  • Replaces Part Number:
    51.036.1.1
 
  • Model:
    2502 Simpson Hartley
  • Part Number:
    51.299.1.1
  • Conversion Kit Number:
    2552.143.501.4
  • Replaces Part Number:
    51.036.1.1
 
  • Model:
    2550 Simpson Bond Determinator
  • Part Number:
    51.299.1.1
  • Conversion Kit Number:
    2552.143.501.4
  • Replaces Part Number:
    51.036.1.1
 
  • Model:
    2552 Simpson Bond Determinator
  • Part Number:
    51.299.1.1
  • Conversion Kit Number:
    2552.143.501.4
  • Replaces Part Number:
    51.036.1.1

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