Issue

Sign that this is happening

Potential Cause

How to check if this is the issue

External oil leaks near seals

Visibly see external oil leakage around the components fitted with seals

  • Seals are damaged

Inspect seals for signs of damage

  • Contamination in oil has damaged seals

Inspect seals for signs of damage and inspect fluid for evidence of debris

  • Piston rod is damaged and has damaged seals

Fully extend the piston rod and inspect the surface for damage, also inspect seals for signs of damage

  • Over pressurisation

Check seal rating, examine seals for deformation & investigate the potential causes for pressure intensification within the cylinder

  • Seals not compatible with fluid media

Inspect seals for signs of damage/deformation and check the compatibility of seal material with fluid

  • Damage to the surface finish of the seal housing grooves due to corrosion

Inspect seal grooves for signs of corrosion

  • Seal housing sizes incorrect

Dimensionally check and compare the seal groove sizes against manufacturers specification

  • Incorrect seals fitted

Check seal part codes and ensure they match the manufacturers specification

  • Metal to metal clearances around the seals are incorrect

Inspect all metal components for signs of wear then dimensionally check components against manufacturers specification

  • Excessive side loading

Visually inspect metal components, bearing rings and seals for signs of excessive wear which will generally appear in one area

External oil leaks near weld

Visibly see external oil leakage around the weld

  • Shock loading

Visually check for oil leakage around the weld then check the operating parameters

  • Defect in weld

Visually check for oil leakage and signs of cracking around the weld, there may be a slight pinhole causing the leak

Piston rod damaged/bent

Visibly see external oil leakage where the rod enters the cylinder body, the movement during actuation may not be smooth and the pressure may need to be increased to actuate the cylinder

Debris in cylinder

Fully extend the piston rod and inspect the surface for scoring along the length and inspect the oil for signs of debris

  • Excessive side loading

Fully extend the piston rod and inspect the surface for signs of excessive wear/damage in one area

  • Structure or external part hitting the piston rod during operation

Fully extend the piston rod and inspect the surface for localised damage then observe the cylinder during actuation

  • Cylinder loading greater than the piston rod rating

Check piston rod for signs of bending and check manufacturers operating parameters of cylinder against actual loadings

  • Not enough overlap in the cylinder

Check piston rod for signs of bending and check for signs of wear on the surface of the rod where it has come into contact with other metallic components.

  • Corrosion on the surface of the piston rod

Fully extend the piston rod and inspect the surface for signs of pitting, check the compatibility of rod material with environmental conditions

Main tube bore scored

Cylinder may not hold pressure, the movement during actuation may not be smooth and the pressure may need to be increased to actuate the cylinder

Debris in cylinder

Inspect the tube bore, piston and piston seal for scoring along the length and signs of debris, also inspect the oil within the cylinder for debris

  • Excessive side loading

Inspect the tube bore for signs of excessive wear in one area, also inspect the tube and piston for signs of metal to metal contact

  • Clearance between metallic components

Inspect the tube bore for signs of excessive wear then dimensionally check components against manufacturers specification