Seven Warning Signs a Hydraulic Hose Is About to Fail

Hydraulic hoses operate under pressure, flex with machine movement and are exposed to heat, abrasion, weather and contamination. A hose can deteriorate internally as well as externally, so condition should be assessed as part of a planned inspection programme rather than only after a leak appears.

Never search for a pressurised hydraulic leak with your hand. Fine jets of fluid can penetrate skin and cause life-changing injury. Isolate the equipment, release stored pressure and follow the manufacturer’s safe maintenance procedure before inspection or replacement.

1. Abrasion or a damaged outer cover

Scuffing where a hose rubs against a frame, guard or another hose can remove the protective cover. If reinforcement is visible, corroded or damaged, the hose needs prompt assessment. Correct the routing or protection as well as replacing the hose, otherwise the damage is likely to repeat.

2. Weeping around a coupling

Oil at the hose-to-coupling interface can indicate seal, fitting, assembly or hose damage. Wiping the area and continuing to operate may hide a developing fault. Isolate and identify the source properly.

3. Blisters, bubbles or local swelling

A raised area can indicate separation between hose layers or damage beneath the cover. Do not puncture a blister. Remove the hose from service and have it assessed.

4. Cracking, hardening or heat damage

A cover that has become brittle, cracked, unusually soft or discoloured may have been exposed to unsuitable temperature, fluid or environmental conditions. Check the hose specification and routing, not just the visible defect.

5. Kinks, flattening or an excessively tight bend

Incorrect bend radius restricts flow and stresses the reinforcement. A hose should not be stretched tight at full machine movement or twisted during installation. Check it throughout the equipment’s operating range while following a safe inspection method.

6. Coupling movement, corrosion or damage

A coupling that appears to have shifted, corroded heavily or suffered impact should be treated seriously. Makeshift clamps and incompatible fittings are not acceptable substitutes for a correctly specified hose assembly.

7. Changes in machine performance

Intermittent operation, pressure loss, unusual noise or heat can have several causes, but a restricted or damaged hose may be one of them. Diagnosis should consider the whole hydraulic circuit and use suitable test equipment and procedures.

What to do when a defect is found

• Stop and make the equipment safe.
• Isolate energy sources and release stored pressure.
• Support any component that could fall or move.
• Identify the hose, fittings, fluid and operating requirements.
• Replace with a compatible assembly following the equipment specification.
• Inspect routing and nearby hoses before return to service.

The Health and Safety Executive warns that even a pinprick leak can cause serious high-pressure fluid injection injury. Any suspected injection injury requires immediate professional medical treatment.

Pratleys provides hydraulic and water hose repair and replacement support. Send equipment details, hose markings, fitting photographs and safe working information so our team can advise on the next step.