IMO-218 EN - Issue 8/202016
9. MALFUNCTIONS
Table 5. lists malfunctions that might occur after prolonged use
Symptom Possible cause Action
Irregular or slow operation Low supply pressure Make sure that supply pressure complies with minimum torque required by
valve. Check that supply air pipes are large enough.
Positioner fault Check positioner operation.
Valve fault Check that valve functions properly without actuator.
Incorrect actuator rating Contact manufacturer to check rating.
Leak in piston or piston rod seal Replace seals.
Cylinder damaged by impurities Note installation position recommendation. Replace cylinder if damaged.
Worn-out actuator bearings Check bearings. Replace bearings when neccessary.
Moving parts corroded in harsh, humid conditions Replace the corroded parts.
Backlash in joint between actuator and valve Replace parts as necessary.
10. TOOLS
For maintenance of the RNP series actuator, you will need a few
common tools.
10.1 TIGHTENING TORQUE
TABLE
Actuator model Bolt size (#9) Tightening torque (Nm)
RNP 40
M6 8
RNP 50
RNP 63
RNP 80
RNP 90
M8 20
RNP 100
RNP 110
RNP 125
RNP 150
M10 40
RNP 175
RNP 200
M12 70
RNP 250
RNP 300
RNP 350
11. ORDERING SPARE PARTS
NOTE:
USE ONLY ORIGINAL SPARE PARTS. THIS ENSURES
PROPER FUNCTIONING OF THE ACTUATOR.
When ordering spare parts, always include following information.
• Type code, sales order number, serial number
• Number of the parts list, part number, name of the part and
required quantity
This information can be found from the identication plate or
documents.
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