Why is jacking of the tower crane slowly?

When the jacking of a Tower Crane is too slow, the following problems may exist:

  1) Oil Hydraulic Pump Station wear, efficiency decline;

  3) Valve stem and valve hole of manual directional valve are seriously worn;

  4) Tower Crane Cylinder piston seal damage, internal leakage.

Recommended solution:

  1) Repair or replace damaged parts;

  2) Add sufficient oil;

  3) Clean the oil filter.