64/78 Commissioning
Bosch Rexroth AG, Control block SB24/34, RE 66170-B/2019-05-15
8.3 Air bleeding
8.3.1 Air bleeding at control block/control block segment
NOTICE!
Short circuits may only be established at working ports at the same
directional valve. Rinsing of the hydraulic lines in the housing is only be possible
by establishing short circuits.
▶
Establish short circuits between the individual directional valve with the working
ports
A
and
B
, e.g. by means of a hydraulic line.
▶
At EHR control valves, working port
A
must be plugged.
Fig. 6: Control block examples with threaded port and hydraulic line
▶
Start air bleeding with the directional valve with the maximum distance to port
P
.
– For SB control valves, refer to chapter 8.3.2
– For control valves with EHS, refer to chapter 8.3.3
– For EHR control valves, refer to chapter 8.3.4
8.3.2 Air bleeding at SB control valves
The hydraulic fluid flow via ports
P
and
R
must be applied. The two consumer
ports
A1
and
B1
must be connected, e.g. by means of a hydraulic line.
1.
Apply a hydraulic fluid flow through the directional valve for at least 20 seconds
and slowly set the valve spool from 0 or neutral position to the fine control range
of spool position
1
and
2
.
2.
Repeat this process several times.
3.
Switch spool positions
1
and
2
several times to maximum position.