Fayat Group BOMAG BW 174 APO-4i Service Manual page 49

1.3.1.2 Repair notes for hydraulics
Please note
Before commissioning
BW 174 APO-4i / BW 174 AP-4i / BW 174 ACP-4i AM / BW 174 AP-4i AM
Cleanliness is of utmost importance. Dirt and other
contaminations must strictly be kept out of the
system.
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Connections and screw fittings, filler neck covers and their
immediate surrounding areas must be cleaned before removal.
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Before loosening hoses, pipe lines etc. relieve all pressure
from the system.
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During repair work keep all openings closed with clean plastic
plugs and caps.
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Never run pumps, motors and engine without oil or hydraulic
oil.
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When cleaning hydraulic components take care not to damage
any fine machined surfaces.
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Chemical and rubber dissolving cleansing agents may only be
used to clean metal parts. Do not let such substances come in
contact with rubber parts.
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Rinse of cleaned parts thoroughly, dry them with compressed
air and apply anti-corrosion oil immediately. Do not install parts
that show traces of corrosion.
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Avoid the formation of rust on fine machined parts caused by
hand sweat.
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Use new O-rings or seal rings for reassembly.
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Use only hydraulic oil as sliding agent when reassembling. Do
not use any grease!
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Use only the specified pressure gauges. Risk of damaging the
pressure gauges under too high pressure.
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Check the hydraulic oil level before and after the work.
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Use only clean hydraulic oil in strict compliance with the speci-
fication in the operating and maintenance instructions to fill the
hydraulic system.
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Check the hydraulic system for leaks, if necessary find and rec-
tify the cause.
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Before taking new hydraulic components into operation fill
these with hydraulic oil as specified in the operating and main-
tenance instructions.
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After changing a hydraulic component thoroughly flush, refill
and bleed the complete hydraulic system.
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Perform pressure tests at operating temperature of the
hydraulic oil (approx. 40 °C).
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After the completion of all tests perform a test run and then
check all connections and fittings for leaks with the engine still
stopped and the hydraulic system depressurized.
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Fill the housings of hydraulic pumps and motors with hydraulic
oil. Use only hydraulic oils according to the specification in the
maintenance instructions.
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After changing a component flush the hydraulic system as
described in the flushing instructions.
General – Notes on repair
49