Periodic Maintenance - Bosch Rexroth Hagglunds VI 44 Series Installation And Maintenance Manual

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Bosch Rexroth Mellansel AB, Intallation and maintenance manual, Hägglunds VI, RE 15310-WA/10.2015

4.4 Periodic maintenance

After that a hydraulic system has been in operation for some time, it should undergo
periodic maintenance and inspection at in tervals which are dependant upon the
equipment and type of operation. This periodic maintenance should cover the
following:
• Check the hydraulic system for leaks. Tighten bolts, change faulty seals and
gaskets, and if necessary clean the system.
• Inspect and clean all air, oil and magnetic filters. Change dirty filter meshes,
inspect and if necessary clean the tank, pump, filter etc.
• Repair or change defective or worn parts.
• Check the pressure and temperature of the hydraulic fluid and perform other
routine inspections. If necessary adjust valves etc.
• Check that the hydraulic fluid has not aged.
• Check that no dirt or other impurities has got into the system during inspection.
If the hydraulic motor in a system is kept clean, leaks and defects will be detected
earlier.
We recommend that an operational journal is kept and that planned inspection
is carried out at predetermined times. Controls and measures are carried out as
follows:
Motor
The motor must be protected against internal rusting if it is not used for a longer
period, approx. 1 month, this can be done in several ways:
1. Mix rust preventive additive with the hydraulic fluid e.g. use 5% Rust Veto
Concentrate (manufacturer: E.F. Houghton & Co., Philadelphia, USA). This
additive can be used continuously, and should protect for up to 1 year. (After
which time the motor must be run).
2. Without additive, the motor must be run a few turns regularly, by starting the
hydraulic system.
3. If it is not possible to run the motor, plug all connections. Open the plug BSP
1 1/4" on the front end cover and fill the motor with oil (see fig. on next page).
Filter
The first service should be carried out after 1 month or 100 hours of operation, after
which checks should be made every 6 months or 500 operating hours.
Oil
The oil loses its viscosity after a certain amount of time, which reduces the
lubrication effect. High temperature and pressure always reduces the life length of
the oil.
• After 6 months or 4000 running hours (whichever comes first) the oil should be
analysed.
• Clean the hydraulic oil tank every year.
• Change oil as soon as it is necessary.
• Check that the tank is clean each time you change oil.