Many of the failures in a hydraulic system show similar symptoms:
- Gradual or sudden loss of high pressure, resulting in slow operation
- Abnormal noise
- High fluid temperature
- Cavitation
- Aeration,
- Inadequate Heat Dissipation
- Incorrect flow
- Faulty operation
Listed below are areas that Hidroservice Engineering engineers diagnose in hydraulic system:
a. Valves
- Dirt in system
- Restricted drain
- Pilot pressure low
- Malfunctions of solenoids
- Distortion of valve body
- Dirt is in the oil
- Poppet or seat is worn
- Orifice or balance hole is restricted
- Drain line is not open freely to a reservoir
- Spring ends are not square
- Valve has an improper spring
- Spring is fatigued
- Valve needs an adjustment
- Installation was improper
- Adjustment was improper
- Spring is broken
- Foreign matter is on a plunger seat
- Gasket is leaky or blown
- Drain line is plugged
- Valve covers are not installed wrong
- Orifices are too large
- Binding occurs
- Pilot pressure is insufficient
- Solenoid is burned out or faulty
- Centering spring is defective
- Spool adjustment is improper
- Cylinder or motor leaks
- Oil viscosity is too high
- Pressure drop is insufficient across a valve
b. Hydraulic cylinders
- Seal leaks
- Wear
- Excessive internal friction
- Piston seizure
- No damping
c. Hydraulic pumps
- Cavitation
- Seals are defective
- Pump is turning too fast
- Max pump pressure exceeded
- Internal leakage
- Pump defective
- Unsuitable pilot valve
- Inlet and return lines connected wrong
- Wear
- Excessive speed
- Seals on the suction side defective
d. Pressure lines
- Lines have been wrongly laid
- Internal diameter is too small
- Leakage
- Pressure filter blocked
- Elasticity of hoses excessive
e. Mechanical lines
- Coupling wrongly aligned
- Coupling loose
- Coupling defective
- Pump or motor defective
- Wrong direction of rotation
f. Suction lines
- Tap in the suction line closed
- Suction filter clogged or too small
- Suction line blocked or leaking
- Wrong dimensions
- Low fluid level
- Wrongly designed reservoir
g. Flow control
- Pressure losses excessive
- False setting
- Valve defective
- Valve dirty
- Valve blocked
h. Hoses
- Leakage
- Line is blocked
- Incorrect assembling
- Pressure excessive
- Incorrect crimping
- Wear
i. Accumulators
- External leakage
- Internal leakage
- Loss of pre-charge pressure
- Incorrect assembling
- Pressure excessive
- Diaphragm wear
Any major component (pump, relief valve, directional valve, or cylinder) could be at fault. In a sophisticated system other components could also be at fault, but this would require the services of an experienced technician.
By a organized step-by-step testing procedures, our engineers indentify the problem. If necessary, each component of the system can be tested or replaced.
