Tuning into your hydraulic system: Hydrasales’ maintenance insights
By Hydrasales, leaders in hydraulic filtration and accessories
WALK along the edge of a busy harbour and the rhythm of industry is unmistakable. Vessels ease into berth, dockside activity welcoming the cargo, cranes swinging into motion, and cargo moves transferred between ship and shore.
Towering mobile harbour cranes lift heavy loads with remarkable precision, their hydraulic systems quietly providing the force and control that keeps operations flowing.
From the outside it appears effortless. But often the earliest signs of trouble and inconsistencies are not dramatic failures; they are subtle declines in the way a system behaves.
To illustrate this, a mobile harbour crane began displaying small but noticeable changes in its performance during load operations. Although it remained fully functional, experienced operators noticed that the smooth movements were no longer as easy as before.
These cranes rely heavily on precision hydraulic components which are sensitive and particularly vulnerable to contamination within the hydraulic fluid.
Even microscopic particles can gradually corrode and damage internal surfaces, affect seals, or interfere or impede with valve spools. Contamination rarely causes sudden failure; instead, it slowly degrades system performance until a serious fault develops.
Fortunately, this crane’s hydraulic system had been equipped with effective and comprehensive filtration and monitoring. These monitoring systems delivered real-time cleanliness readings according to the ISO 4406 standard, allowing maintenance personnel to observe changes in fluid condition as they occurred.
During routine monitoring, the contamination monitor recorded a steady increase in particle levels. The return filter’s clogging indicator activated, signalling that the filter media had reached its holding capacity.
Maintenance teams responded promptly, replacing the return filter. Investigation traced the source to early internal wear within the boom cylinder. Guide rings had begun wear, allowing slight piston misalignment that ultimately damaged a piston seal. The wear had generated metallic debris into the hydraulic circuit. Left undetected, this contamination could have accelerated component wear, damaged control valves, and ultimately led to a major failure of the boom cylinder during lifting operations.
Instead, the early warning provided by contamination monitoring allowed technicians to intervene before a catastrophic breakdown occurred.
This scenario highlights an important principle: filtration does more than simply remove contaminants. It preserves system performance and protects critical
components.
Modern hydraulic systems operate under extreme pressures and high flow rates, making it essential that filtration equipment is constructed to perform under demanding conditions.
However, even the best filter is only effective when properly monitored. Tools such as clogging indicators and real-time contamination monitors provide valuable insight into the system, allowing maintenance teams to respond early.
At Hydrasales, our philosophy around hydraulic performance and reliability is based on prevention rather than reaction. Our extensive range of filtration and contamination monitoring solutions include:
- High-pressure inline filters for core system protection
- Return-line and suction filters for complete loop filtration
- Tank-mounted breathers and accessories to prevent external contamination
- Contamination monitors and clogging indicators for real-time condition monitoring
- Monitoring products for, level, pressure, flow and temperature.
We work closely with engineers and workshop managers to supply components and help build hydraulic systems that remain clean, efficient, and reliable over the long term.
Whether supporting mobile harbour equipment, industrial machinery, and other heavy-duty hydraulic applications, understanding what your system is telling you can make all the difference.
For more information contact harpo@hydrasales.co.za or visit www.hydrasales.co.za
