Hydraulic System - Bomag BW 211 D-40 Service Manual

1.3

Hydraulic system

Caution
!
Do not open any hydraulic components if you
have not been properly trained and without exact
knowledge.
Please note
Cleanliness is of utmost importance. Make sure that
no dirt or other contaminating substances can enter
into the system.
Clean fittings, filler covers and the area around such
●
parts before disassembly to avoid entering of dirt.
Before disconnecting hoses, pipes or similar relieve
●
the system pressure with the engine shut down.
During repair work keep all openings closed with
●
clean plastic plugs and caps.
Do not run pumps and motors without oil.
●
When cleaning hydraulic components take care not
●
to damage any fine machine surfaces.
Chemical and rubber soluble cleansing agents may
●
only be used to clean metal parts. Do not let such
substances come in contact with sealing material.
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.
Avoid the formation of rust on fine machined caused
●
by hand sweat.
Grease must not used as a sliding agent for assem-
●
bly work. Use hydraulic oil.
Do not start the engine after the hydraulic oil has
●
been drained off.
Use only the specified pressure gauges. Risk of
●
damaging the pressure gauges under too high pres-
sure.
Clean ports and fittings before removal so that no
●
dirt can enter into the hydraulic system.
Check the hydraulic oil level before and after the
●
work.
Use only clean oil according to specification.
●
Check the hydraulic system for leaks, find and rec-
●
tify the cause.
Fill new hydraulic units with hydraulic oil before
●
starting operation.
After changing a component thoroughly flush and
●
bleed the entire hydraulic system.
Perform measurements at operating temperature of
●
the hydraulic oil (approx. 40 ¯C).
16
After changing a component perform a high and
●
charge pressure test, if necessary check the speed
of the exciter shaft.
The operating pressure of the exciter shaft to a
●
great extent depends on the base under the vibrat-
ing drum. If the soil is too hard place the drums on
old rubber tires. Do not activate the vibration on a
hard, concreted base, danger of bearing damage.
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
After changing a component clean the hydraulic oil
●
tank thoroughly.
Fill the housings of hydraulic pumps and motors
●
with hydraulic oil.
Use only hydraulic oils according to the specifica-
●
tion in the maintenance instructions.
After changing a component clean the hydraulic
●
system as described in the flushing instructions in
order to prevent all other components from being
damaged by abrasion and metal chips remaining in
the system.
Change the hydraulic oil filter.
●
Commissioning
Bleed the hydraulic circuits.
●
Start up the system without load.
●
Check the hydraulic oil level in the tank, fill up oil if
●
necessary.
After commissioning
Check system pressures and speeds.
●
Check fittings and flanges for leaks.
●
After each repair check all adjustment data, rota-
●
tional speeds and nominal values in the hydraulic
system, adjust if necessary.
Do not adjust pressure relief valves and control
●
valves to values above their specified values.
BOMAG
General repair instructions
008 911 63