How to install the hydraulic hose correctly?

Feb 03, 2020

When installing hydraulic hoses, in order to maximize the life of the hose and its accessories, you need to consider various factors related to the specific application.

1. Hydraulic hose slack
When a hydraulic hose is pressurized, its diameter increases to contain the force of the fluid being conveyed. Therefore its length is reduced by up to 4%. This means, for example, that a 3-foot component can be shortened by up to two inches! Without sufficient slack, the fitting will be stressed and cause leakage. Or worse, the hose may be completely loose.

2. Do not exceed the minimum bending radius
The steel wire reinforcement built into the hydraulic hose limits its flexibility. How many hoses can you bend before the steel reinforcement begins to twist, from smooth arcs to sharp corners? This is the bend radius that you do not want to exceed when installing the hose.

3. Use elbow connector or adapter if necessary
A general rule of thumb for hose installation is that if the hose needs to be bent immediately before the metal fitting, it should be kept straight at least twice the outside diameter (OD). If this is not possible, use a 90 or 45 degree elbow. This prevents direct shocks to the fluid at high speeds, which can damage the hose and cause premature failure.

4. Limit bending to a plane
Hydraulic hoses naturally encounter some use in motion; the ability to do so makes flexible hoses ideal for conveying pressurized fluids in dynamic applications. However, this movement should be limited to a single plane: from left to right, up and down, or back and forth. Any combination of these produces two planes of motion, called a compound bend. Because the end of the hose is firmly fixed, more than one plane of motion can cause the hose to distort, leading to premature failure.

5. Avoid twisting the hose
A continuous information line, called a parallel line, is printed on the outer surface of the hydraulic hose. If after the hose is installed, the strands are helically wound like stripes on a candy bar, it means that the hose is twisted during the installation. This is not good; the hose is under pressure and may fail prematurely. Loosen the connector to straighten the hose and then re-tighten it with two wrenches, one fixed and the other fixed.

6. Fix the hose with a hose clamp
Wear is the main cause of premature hose failure. When the outer cover of the hose is worn, the steel wire reinforcement is exposed, causing the wire to rust in a humid environment. To avoid this, please clamp each hose separately to keep it in place (some actions can of course be performed) and not rub against other nearby hoses or other objects.

How to install the hydraulic hose correctly?

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