Fayat BOMAG BC 462 RB, Service Manual

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General repair instructions
BOMAG 17 008 917 13
1.3
Hydraulic system
!
Caution
Repair work on hydraulic elements shall only per-
formed by appropriately trained personnel or by
the after sales service of BOMAG.
Please note
i Note
Cleanliness is of utmost importance. Dirt and other
contaminations must strictly be kept out of the system.
l
Connections and screw fittings, filler neck covers
and their immediate surrounding areas must be
cleaned before removal.
l
Before loosening hoses, pipe lines etc. relieve all
pressure from the system.
l
During repair work keep all openings closed with
clean plastic plugs and caps.
l
Never run pumps, motors and engines without oil or
hydraulic oil.
l
When cleaning hydraulic components take care not
to damage any fine machine surfaces.
l
Chemical and rubber soluble cleansing agents may
only be used to clean metal parts. Do not let such
substances come in contact with rubber parts.
l
Rinse of cleaned parts thoroughly, dry them with
compressed air and apply anti-corrosion oil immedi-
ately. Do not install parts that show traces of corro-
sion.
l
Avoid the formation of rust on fine machined caused
by hand sweat.
l
Use new O-rings or seal rings for reassembly.
l
Use only hydraulic oil as sliding agent when reas-
sembling. Do not use any grease!
l
Use only the specified pressure gauges. Risk of
damaging the pressure gauges under too high pres-
sure.
l
Check the hydraulic oil level before and after the
work.
l
Fill in only clean oil as specified in the maintenance
instructions.
l
Check the hydraulic system for leaks, if necessary
find and rectify the cause.
l
Before taking new hydraulic components into oper-
ation fill these with hydraulic oil as specified in the
operating and maintenance instructions.
l
After changing a hydraulic component thoroughly
flush, refill and bleed the complete hydraulic sys-
tem.
l
Perform measurements at operating temperature of
the hydraulic oil (approx. 40 ¯C).
l
After changing a component perform a high and
charge pressure test, if necessary check the speed
of the exciter shaft.
l
The operating pressure of the exciter shaft to a
great extent depends on the base under the vibrat-
ing drum. On hard ground place the drums on a suit-
able base and check the drum pressure. Do not
activate the vibration on a hard, concreted base,
danger of bearing damage.
l
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 sys-
tem depressurized.
Before commissioning
l
Fill the housings of hydraulic pumps and motors
with hydraulic oil. Use only hydraulic oils according
to the specification in the maintenance instructions.
l
After changing a component flush the hydraulic sys-
tem as described in the flushing instructions.
Taking into operation
l
Bleed the hydraulic circuits.
l
Start up the hydraulic system without load.
l
Check the hydraulic oil level in the tank, if neces-
sary top up with hydraulic oil as specified in the op-
erating and maintenance instructions or drain oil off
into a suitable container.
After taking into operation
l
Check fittings and flanges for leaks.
l
After each repair check all adjustment data, system
pressures, rotational speeds and nominal values in
the hydraulic system, adjust if necessary.
l
Do not adjust pressure relief valves and control
valves to values above their specified values.