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General repair instructions
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.
Connections and screw fittings, filler neck covers
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and their immediate surrounding areas must be
cleaned before removal.
Before loosening hoses, pipe lines etc. relieve all
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pressure from the system.
During repair work keep all openings closed with
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clean plastic plugs and caps.
Never run pumps, motors and engines without oil or
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hydraulic oil.
When cleaning hydraulic components take care not
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to damage any fine machine surfaces.
Chemical and rubber soluble cleansing agents may
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only be used to clean metal parts. Do not let such
substances come in contact with rubber parts.
Rinse of cleaned parts thoroughly, dry them with
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compressed air and apply anti-corrosion oil immedi-
ately. Do not install parts that show traces of corro-
sion.
Avoid the formation of rust on fine machined caused
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by hand sweat.
Use new O-rings or seal rings for reassembly.
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Use only hydraulic oil as sliding agent when reas-
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sembling. Do not use any grease!
Use only the specified pressure gauges. Risk of
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damaging the pressure gauges under too high pres-
sure.
Check the hydraulic oil level before and after the
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work.
Fill in only clean oil as specified in the maintenance
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instructions.
Check the hydraulic system for leaks, if necessary
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find and rectify the cause.
Before taking new hydraulic components into oper-
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ation fill these with hydraulic oil as specified in the
operating and maintenance instructions.
After changing a hydraulic component thoroughly
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flush, refill and bleed the complete hydraulic sys-
tem.
008 922 89
Perform measurements at operating temperature of
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the hydraulic oil (approx. 40 ¯C).
After changing a component perform a high and
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charge pressure test, if necessary check the speed
of the exciter shaft.
The operating pressure of the exciter shaft to a
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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.
After the completion of all tests perform a test run
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and then check all connections and fittings for leaks
with the engine still stopped and the hydraulic sys-
tem depressurized.
Before commissioning
Fill the housings of hydraulic pumps and motors
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with hydraulic oil. Use only hydraulic oils according
to the specification in the maintenance instructions.
After changing a component flush the hydraulic sys-
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tem as described in the flushing instructions.
Taking into operation
Bleed the hydraulic circuits.
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Start up the hydraulic system without load.
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Check the hydraulic oil level in the tank, if neces-
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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
Check fittings and flanges for leaks.
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After each repair check all adjustment data, system
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pressures, rotational speeds and nominal values in
the hydraulic system, adjust if necessary.
Do not adjust pressure relief valves and control
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valves to values above their specified values.
BOMAG
1.3
17
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