Metso Neles N1 Series, Инструкции по установке, обслуживанию и эксплуатации

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6 N1 70 en 9
4.2 Maintenance precautions of the
N1_E_C and N1_E_A actuator
The spring module has a warning sticker. When servicing
the unit, check that the sticker is in place and legible. See
Fig. 8. Also check that the spring module has the arrow
sticker indicating the spring operating direction.
Fig. 9 Warning plate of the N1_E_C and N1_E_A actuator
4.3 Module removal and installation
4.3.1 Spring module removal
Step 1. Apply pneumatic pressure to front cover (3) to com-
press the spring enough to move the yoke off the stop
screw of spring module side of the central block module.
Step 2. Loosen the stop screw nut (43) located on the stop
screw that is closest to or next to Spring Module.
Step 3. Unscrew stop screw (42) that is closest to or next to
Spring Module (unscrew or back out until the load is
removed from the stop screw).
Step 4. Remove pneumatic pressure from pressure inlet
port of front cover (3).
Step 5. Spring cartridge preload must be removed before
spring module is removed from actuator assembly. To remove
spring cartridge preload Apply pneumatic pressure to rear
cover (10) to move the spring cartridge connecting rod (58).
Step 6. Unscrew bolts (44) of rear side end cap (61) and
remove end cap.
Step 7. Unscrew lock nut (53) of connecting rod (58) to
remove lock nut.
CAUTION:
Don’t dismantle a pressurized actuator!
CAUTION:
To release spring tension, the spring direction stop
screw at the central block must be removed before the
cylinder fastening screws are opened!
CAUTION:
Don’t dismantle the spring package!
The spring package within the cylinder is preloaded.
Never open or dismantle the spring package. The spring
module is always delivered as a pre-assembled package.
WARNING:
Do not remove spring module while spring is
compressed
NOTE:
Review section 4.4.1 General Disassembly before pro-
ceeding with spring module disassembly. The setting of
stop screws should be checked and setting recorded
before stop screws are loosened or removed.
CAUTION:
Due to the weight and size of spring cartridge assem-
bly, heavy duty support equipment will be required
when removing module from actuator assembly.
CAUTION:
Maximum pressure to be applied in the above step is 1 barg
(1 kg/cm
2
).
NOTE: If pneumatic pressure is not available to apply, use
special Metso spanner for ring nut.