– Pay attention to cleanliness while repairing the quarter-turn actuator. Do not allow dirt particles to get into the quar-
ter-turn actuator.
– A shutdown must be performed before any repair work is carried out.
– Before repairing the quarter-turn actuator, any attachments on it must be dismantled.
– The control block must be completely depressurised and de-energised, and reliably secured against unauthorised
restarting before starting any repair work is started.
– Accidental switching on or concealed pressure can trigger unexpected movements during dismantling of the quar-
ter-turn actuator. Therefore, completely vent the quarter-turn actuator before each repair.
– Use original spare parts only to repair the quarter-turn actuator.
– Wear the necessary personal protective equipment.
– In the event of damage to the quarter-turn actuator caused by
– unauthorised manipulation,
– non-intended use (misuse),
– use of non-original spare parts
all warranty and liability claims against the manufacturer expire.
– The technical documentation required for installation and start-up (functional test) of the quarter-turn actuator must
be available.
2.2 General information
– Standard tools are needed to repair the quarter-turn actuator, which must be available in a service workshop
( Chapter 1.4 on page 6).
– Components and equipment replaced during repair must be disposed of in accordance with the relevant local
environmental protection regulations.
– Where possible the repair should be carried out on a stable and at work surface with space for small parts.
– The gures of the repair steps show size DFPD-300-…-D / S-…-60 (12 installed springs) by way of example. Individual
minor differences between the quarter-turn actuator in hand and the illustrated example are possible.
– Depending on the temperature range (standard / T4 / T6), Festo recommends the following lubricants:
– SYNTHY POLYMER 402/2 (standard variant)
– HEVOLIT PE 280-1 FG (high-temperature variant T4)
– RENOLIT SI 300 M (low-temperature variant T6)
– Individual components must be greased when installing the quarter-turn activator. The following table shows the
recommended quantity of grease during the entire installation.
Size Recommended quantity of grease for installation
DFPD-10 2 g
DFPD-20 3 g
DFPD-40 5 g
DFPD-80 7 g
DFPD-120 11 g
DFPD-160 15 g
DFPD-240 20 g
DFPD-300 30 g
DFPD-480 45 g
DFPD-700 55 g
DFPD-900 65 g
DFPD-1200 85 g
DFPD-2300 110 g
7 / 74DFPDb_en
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