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19
5.2.2 Installation
Place a new O-ring (140) into the groove in the pre-
stage mounting plate (400) and press the prestage
into place. Make sure the nozzle is guided into the O-
ring properly. The screws guide the prestage body
into the correct position. Tighten the screws (139)
evenly.
Push the prestage 2-pole wire connector into the
socket on the connector board (182). The wire con-
nector can only be fitted in the correct position.
Replace the inner cover (39) and tighten the M3
screws.
5.3
Spool valve
5.3.1 Restricted and standard
Restricted and standard capacity means the spool valve
options 12 and 15 in SG9_12 and SG9_15 respectively. See
type coding in the machine plate for details.
5.3.1.1 Removal
For spool valve removal it is usually necessary to unmount
the valve controller from the actuator.
Before removing the spool valve assembly in
SG9300, the spool valve cover (454) needs to be
removed. Unscrew the M4 screws (4 pcs.).
Working from the bottom side of the valve control-
ler, unscrew the M5 screws (4 pcs.). Remove the
spool valve (420) with gasket (63). Do not remove
the spool valve adapter plate (421).
5.3.2 Installation
Mount the spool valve (420) to the housing, and
tighten the four M5 screws evenly.
Mount the spool valve cover (454) (only in
SG9300).Tighten the four M4 screws evenly.
5.3.3 High capacity
High capacity spool valve means the spool valve options 35
or 37 in SG9235 or SG9237. See type coding in the machine
plate for details.
5.3.3.1 Removal
Unscrew the M5 screws (4 pcs.). Remove the spool
valve (420) with gasket from the mounting block
(421).
5.3.4 Installation
Ensure that the gasket (63) is properly located in the
grooves in the bottom of the spool valve. Mount the
spool valve (420) to the mounting block (421), and
tighten the four M5 screws evenly.
NOTE:
Spool valve cannot be changed in the field.
NOTE:
If the maintenance operations are needed for the spool
valve, it is advised to replace the whole spool valve assem-
bly with a spare unit.
NOTE:
If adapter plate (421) is lifted away from its place, special
attention must be paid to ensure that gasket (174) and
pipe (431) are properly attached to the housing. O-rings of
the pipe must be handled carefully in order to avoid
breakage.
Fig. 23
Spool valve assembly
NOTE:
If the maintenance operations have been done for the
spool valve assembly, the device
must
always be cali-
brated and tuned.
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