Jonsered FR 2213 MA, Руководство по ремонту

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8.5 Hydraulic system
8.5.1 Hydraulic system overview
8.5.2 To keep the hydraulic system clean
• Make sure the parts and the area around them are
clean before opening the filling cap or disconnecting
parts of the transmission.
• Use clean containers with new oil.
• Only use clean oil that has been kept in sealed
containers.
• Do not use drained oil again.
• Obey the oil and filter change intervals specified in
the Servicing Schedule. See
Servicing schedule on
page 10.
It is necessary to keep the hydraulic system free from
contamination. Particles caused by the moving parts of
the transmission can cause wear damage and
malfunctions. The transmission oil filter remove
contaminations from the oil. If dirt enters the system the
filters will quickly get blocked and will not work. This will
result in malfunction and it will be necessary to clean the
system.
Do not open the hydraulic system unless it is necessary.
Each time the transmission i opened increases the risk
of contamination although the work is made by a
professional service center.
8.5.3 Oil leaks
WARNING: Oil is dangerous to the environment
and leakage can cause damage to the lawn.
CAUTION: Oil leakage can cause damage to
the transmission and make it wear it out faster.
Repair oil leaks immediately.
8.5.4 Work procedure
The components must be clean. A replaced component
will possibly be examined with test equipment at a
service center. The component must be in the same
condition when examined as it was when it was
removed from the product. If not, the fault can not be
found and there will be contaminations in the test
equipment. It is also possible that the sent component is
not the fault and is thus sent back without repair.
The points below must be obeyed when doing work on
hydraulic systems:
•
Clean the transmission as necessary.
• Keep the work area free from dust and other
contaminations in the air with a plastic cloth.
• Make the work area clean with white spirit. To only
clean the parts that are disassembled is not
sufficient. Tools and areas from where dirt can fall
onto the point of entry while work is in progress must
be cleaned. Clean the work area with an applicable
brush, use a cloth to dry the work area. If it is
necessary, clean the work area again. Before you
disassemble, spray the hose connections and the
area on the product with white spirit.
• Apply applicable protection immediately after all
pipes and hoses have been removed. Components
(also exchanged), hoses and pipes must have
protection.
• The parts included in pipe fixtures must be replaced
or cleaned in white spirit and blown clean with
compressed air before being attached.
• Keep the parts clean when measuring the pressure.
Spray the two couplings parts with white spirit before
connecting. Make sure the protection is clean before
using it.
8.5.5 Hydraulic couplings, pipes and hoses
Use 2 tools to loosen and tighten hoses. Use one tool as
a counterhold to get a minimum of tension and turning
force in the hose. A counterhold prevents hairline cracks
to elbow nipples.
When assembling hydraulic lines, first tighten until the
tapers connect and there is wrench resistance. Then
tighten one and a half flats from wrench resistance. Do
not tighten more.
Always do a check and note how hose, lines and pipes
are tightened on the product before loosening or
disassembling. They must always be attached with the
same tightening torque. Information about tightening
torques can be found in the spare parts list.
Make sure that hoses and lines go clear of locations
where they can be worn. Always do a check for leakage
after attaching hoses, lines or pipes.
Pressure to the hydraulic system is given by the pump of
the drive system. A pressure valve sets the system
pressure to a maximum limit of 30 bar/435 PSI.
There is a filter in the hydraulic tank for the suction pipe
of the pump.
8.5.6 Hose package
Hoses below the product are kept together with a plastic
hose protection wound around the hoses. The hoses
have color marks when they are new. It is possible to
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