Flushing Before Start Up - Bosch Rexroth Hagglunds DUc MS2 Installation & Maintenance Manual

58/88 Hägglunds DUc Drive unit | Commissioning
Bosch Rexroth AB, Version 06.2020, RE 15326-WA

8.3 Flushing before start up

A pressure filter and check valve has to be connected to the main line at the Drive
Unit. This filter is connected on the return side of the drive pump.
Recommended filtration degree β10 ≥ 75.
The size of the flushing filter should be matched to the installed pump, so that the
pressure drop across the filter not is excessive and that the max. pressure/flow
ratings for the filter not is exceeded.
The main lines should be connected together at the motor side enabling the entire
system to be flushed, see Fig. 54.
If the system not is fitted with a flushing line to the hydraulic motor, the drain line from
the motor has to be plugged.
If the system is fitted with a flushing line to the hydraulic motor, the flushing line
shall be connected to the drain line of the motor to enable cleaning of the flushing line.
Wrong direction of rotation of the pump
Pump will be damaged. System contaminated
▶ Make sure that the pump has the correct direction of rotation. The correct
direction of rotation is marked with a sign placed under the electric motor, see
Fig. 55: Direction of rotation.
Rotating parts!
Risk of injury.
▶ Do not touch rotating parts inside the inspection hole see Fig. 55: Direction of
rotation.or in the zone of rotating parts.
The maximum flow from the Drive Unit should be flushed through the main circuit
for at least 2 hours on small installations and considerably longer time on large
installations. Use extreme caution to ensure pump is stroked in sync with free flow
direction of check valve. Use a check valve sized for the oil flow.
When using the main pump the maximum pressure should be reduced.
After cleaning and flushing of the system, particle content has to be verified with
oil sample test, inline cleanliness measurement or corresponding.
High cleanliness is important for long lifetime of the hydraulic system.
Flushing filter
Check valve
Fig. 54: Hydraulic circuit flushing
CAUTION
Hoses connected
together
Flow direction
Drive Unit
DD00073833