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Commissioning | Load-sensing control block SB11
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.
▶ Start air bleeding with the directional valve with the maximum distance to port P.
– Control valves SB with EHS see chapter 8.3.2
– Hitch control valves EHR with EHS see chapter 8.3.3
Fig. 4: Control block examples with threaded port
and hydraulic line
8�3�2 Bleeding SB control valves with EHS
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.
NOTICE! Air inside the actuating unit can lead to vibrations at the control spool in
control position and an actuating time exceeding the programmed diagnosis limit.
The effect this exceeded time depends on the vehicle.
NOTICE! In the installation positions permissible with restrictions, increased air
bleeding expenditure is to be expected. In order to completely bleed the control
spaces, step 3 of the air bleeding procedure must be repeated several times.
1� Move the control spool from the 0 or neutral position into the fine control
range and establish a small flow (q < 20 l/min) through the directional valve
for at least 20 seconds. This process must be carried out for the spool
positions 1 and 2.
2� Repeat this process several times. Only when it is ensured that no more air is
present in the directional valve housing may the control valve be switched with
the maximum permissible flow.
3� Switch the control valve at least 20 times with a frequency of 2 Hz between
100% lifting (spool position 1) and float (spool position F). Control valves
without release position are switched between 100% lifting (spool position 1)
and 100% lowering (spool position 2).
RE 66177-B/2022-05-03, Bosch Rexroth AG
47/60
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