Keeping Hydraulic Oil Clean; Working Methods; System; Bleeding The Hydraulic System - Husqvarna Rider 15V2 Workshop Manual

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Keep the hydraulic oil clean
Dirt and contaminants are the greatest enemies of a
hydraulic system. Moreover, long work sessions at
high power are very dependent on whether the
hydraulic oil has been able to retain its condition.
Only use the type of oil specified in the lubrication
schedule. Ensure that it is checked at regular
intervals and kept at the right level.
All good oils are supplied in clean containers and are
filtered so that they are as free from contaminants as
possible. It is when the container is opened or stored
that problems occur. When a container is opened,
one must be sure that the area around the cap is
completely free from dust, dirt, rag fibres, and water.
If a special container, funnel, or hose is required for
filling the system, ensure that it is clean.

Working Methods

Cleanliness also applies to components that have
been removed or shall be fitted. Keep in mind that a
replaced component should probably be inspected
with the aid of test equipment at a workshop. It is
important that the component is in the same shape
when it is inspected as it was when it was removed
from the machine. Otherwise, the real reason for the
malfunction cannot be established and the test
equipment can be made dirty. It can also be so that
the submitted component is not faulty and is
therefore returned without action. The following
points should be gone through routinely when
working with the hydraulic system:
1. Clean as necessary.
2. Protect the area where the work is to be done
against dust and other impurities in the air.
Plastic sheets and the like may be used.
3. Clean thoroughly with white spirit or equivalent.
Remember that it is not enough to clean only
those parts that are directly attacked. Areas from
where dirt can fall onto the work area must also
be cleaned, as must the tools used. Clean with a
suitable brush, dry with a cloth, and clean again if
needed. Finally, rinse the dismantling area,
tubing equipment, and so on with pure white
spirit.
4. Apply appropriate protection immediately after all
pipes and hoses have been removed.
Components (even those replaced) as well as
pipes and tubing must be protected.
5
All components included in pipe fixtures shall be
replaced or cleaned in pure white spirit and blown
clean with compressed air before being refitted.
6. Maintain cleanliness when measuring pressure.
Rinse both parts of the quick connectors with
white spirit before each connection. Ensure that
any protective components are clean before
refitting.
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System

Pressure to the hydraulic system is provided by the
hydrostatic pump. A pressure limiting valve limits
the maximum system pressure to about 45 bar/630
PSI. A hydraulic oil filter of the spin-on type is used
to filter impurities. There is also a filter in the
hydrostatic transmission. Both filters work together
to keep the system as clean as possible.

Bleeding the Hydraulic System

See 'Repair Instructions\Bleeding of Hydrostatic
and Hydraulic Systems'.

Power Steering

The power steering is described under 'Design and
Function\Steering'. See also 'Repair
Instructions\Removing the Power Steering'.

Hydraulic oil filter, replacement

1. Dismantle the oil filter. If necessary, use a filter
remover.
2. Wipe new, clean engine oil onto the seal for the
new filter.
3. Mount the filter by hand with + 3/4 turn.
4. Remove the transmission cover and fill the
transmission oil tank. The oil level may exceed
the maximum mark, see point 6. Pay attention
when running the engine and top up so that the
tank does not run dry.
5. Run the engine, turn the steering, and then
check that there are no leaks around the oil
filter seal.
6. Check the oil level in the transmission, top up if
necessary. The oil filter holds 0.3 litres/0.3 US
qt of oil.
7. Replace the transmission cover.
Hydraulic System
71
English –

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