I. Improper hose/connector type or installation.

1. The connector used is fitted improperly or the connector material fails to meet requirements, for example, A3 materials used by some manufacturers are too soft to withstand required pressure.Improper connector material or size may cause deformation in crimping operation, which harms the crimping quality and reduces hose service life.

2. Improper crimping tightness and speed during assembly of connectors to rubber hose.Insufficient crimping tightness may result in detachment of rubber hose from the connector when hydraulic pressured is applied. Excess crimping tightness between connector and hose may cause local damage toinnerlayer of rubber hose and cause cracks, through which pressurized hydraulic oil may enter the wire layer, go through the minor gaps between wires and burst out from theouterlayer, or it may accumulate in a local area along the wire layer and cause bubbles or fracture. Excess crimping speed may cause breakage of wire layer and damages to theinnerrubber layer, and therefore reduce the service life.

II. Improper use.

Even if quality products are adopted, improper use may also significantly cut short service life of rubber hose. In practices, most hose damages are caused by improper use.

1.Frequentand intensive pressure impact.Bursting damages to HP hoses are not usually caused by excess static pressure, but are closely related to the intensity and frequency of pressure impact. When construction machines are in operation, there are repeated sudden rises and falls of pressure in the hydraulic hose, which form frequent pressure impact and cause and accelerate damages to oil seal, hose bubbles and fracture as well loosening of connectors. Therefore in operation, care should be taken to operate gentlyto avoid violent operation to valve rods.

2.Excess oil temperature.When construction machines are in operation, power loss in hydraulic systems causes temperature rise of hydraulic oil, which, amplified by external temperature conditions (especially in summer) may cause dramatic oil temperature rise. High oil temperature accelerates rubber aging and reduces its elasticity, strength and sealing effect, so that bursting fracture occurs quickly.Thence, in operation, when excess oil temperature or rising speed is found with the hydraulic system, the user should find out and eliminate the causes. In summer, especially in caseswherecontinuous operation is required, necessary cooling measures should be taken.

Disclaimer:

Empire takes no responsibility for any accident or loss caused byimproper use against instructions in the Operation Manual or by anynatural disaster, intentional acts,forcemajeure or any reason other than product defects.