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Maintenance and repair
Bosch Rexroth AB, Installation and maintenance manual, Hägglunds DOb, RE 15327-WA/05.2017
10.6 Cooler
10.6.1 Cleaning
The cooler has to be cleaned when the temperature in the hydraulic system is above
specified limits due to low cooling capacity.
Before cleaning:
• Stop the drive unit.
• Switch off the electric power.
• Make sure that the cooler has cooled down.
Improper handling
Environmental risk
▶
Follow the safety precautions on the container of the cleaning agent used
▶
Cleaning agent and waste water from rinsing should not be desposed in nature
Air oil cooler
Cleaning of air fins
• The easiest way to clean the cooler matrix is using compressed air or rinsing with
water.
• Fouling can be removed by using a degreasing agent and a high-pressure washing
system. When using a high pressure washing system point the jet carefully parallel
to the cooler matrix.
• The oil side of the cooling element is cleaned by flushing with a degreasing agent.
Aterwards flush with the fluid/medium which is used later
10.7 Drive unit out of service
Periods out of service
If the drive unit is to be out of service for more than three months, the hydraulic
system must be protected internally against rust. The period must be shorter if the
equipment is placed in a humid or aggresive environment.
Execution:
Use hydraulic fluid with rust preventing additives according to ASTM D665 class A
or hydraulic fluid similar to Shell corr. hydraul, 2% VSI-improver. This additive gives
protection against rust maximum one year.
For storage more than one year the equipment must be run once a year to maintain
a protective film on the internal surfaces of components and oil lines to protect
against corrosion.
If any parts of the system are disconnected, note that open fittings must be
protected with plugs or covers to prevent from dirt particles.
Re-commissioning
Before the plant is re-started after a long stop period, a check must be done to verify
the system function.
Meassures to be done:
• Remove preservative fluid and any signs of contamination.
• Follow the procedure in 8.4: Initial start up procedure.
NOTice
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