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Knuckle cranes

  • Provisional maintenance and checking
  • Points to be checked
Points to be checked before operation
  1. 1) Is there enough hydraulic oil inside the oil tank?

    - Check the hydraulic oil in the state of folding the outrigger and boom on the flat ground and fill it when it is under the lower limit line

  2. 2) Aren’t there any leaking in the hydraulic hose, pipe and connecting part? Is there any doubtful noise?

    - Change the damaged hose and pipe and fasten with proper tool when the connecting hole is loosened.

  3. 3) Isn’t there any crack or damage or wearing on the structure and connecting part?

    - Check whether there is no crack or damage on the structure, connecting pin and shaft or whether it is loosened due to the wearing of bearing and bushing.

  4. 4) Is the control lever moved normally?

    - Check whether the level is moving well and it returns to neutral position and apply grease or oil when it is not normal.

  5. 5) Aren’t the electric cable and cable damaged?
  6. 6) Is the oil inside the crane base sufficient? Fill it if it is lacked.
Points to be checked during operation
  1. 1) Any leaks of hydraulic oil?
  2. 2) Isn’t there any point of clicking the hose or cable in case of boom rotation?
  3. 3) Is the crane operated normally and no noise?
  4. 4) Isn’t the temperature of hydraulic oil so high?
Points to be checked after 1 month of operation
  1. 1) Is the sealing of the pressure adjusting system good?
  2. 2) Any leaking oil?
  3. 3) Do bolts and screws get loosened?
  4. 4) Is the operation on the control valve and control lever normal?
  5. 5) Aren’t there any crack or damage on the structure, pin and shaft?
  6. 6) Aren’t there any extreme damage or crack on the structure, pin and shaft?
  7. 7) Change the filter.
  8. 8) Lubricate according to the lubrication table.
  9. 9) Is the hydraulic oil sufficient?
  10. 10) Do a test operation and then check any abnormal sound.
Points to be checked after 6 months of operation
  1. 1) Clean the exterior parts of crane.
    • - Wipe out the metal with clean cloth. Do not wash out with the solvent, thinner, benzol, fuel or gasoline.
    • - Use the same class oil with the operating oil when the hydraulic parts are cleaned.
  2. 2) Is the sealing of the pressure adjusting system good?
  3. 3) Any leaking oil on the hydraulic pipe?
  4. 4) Do bolts and screws get loosened?
  5. 5) Is the operation on the control valve and control lever normal?
  6. 6) Isn’t there any crack or damage or wearing on the structure and connecting part?
  7. 7) Aren’t there any extreme damage or crack on the structure, pin and shaft?
  8. 8) Change the filter.
  9. 9) Lubricate according to the lubrication table.
  10. 10) Is the hydraulic oil sufficient?
  11. 11) Do a test operation and then check any abnormal sound.