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Installation, Operation and Maintenance Manual
MAN 564 Rev. 6
June 2020
Maintenance
Section 5: Maintenance
5.3.4
Setting
A) Setting of the actuator operating times (see the attached sectional drawings)
The setting of actuators operating times in opening and in closing is performed by
adjusting the unidirectional flow regulators (items Fa and Fc of operating diagram
MAN 562-A) assembled into the plate (item 11): into the plate left side the flow regulator
for the actuator opening time setting; into the plate right side the flow regulator for the
actuator closing time setting.
As the flow regulators are unidirectional type the actuator operating times can be set
independently in opening and in closing.
To perform the setting of the flow regulators proceed as follows.
•
Unscrew the cap nut (item 2) from the setting screw (item 28).
•
Loosen the lock nut (item 30).
•
By a screwdriver rotate clockwise the setting screw (item 28) to increase the
operating time; rotate counter clockwise to decrease the operating time.
•
Check that the operating time is the required one.
•
Tighten the lock nut (item 30). During this operation keep the setting screw
(item 28) still with a screwdriver.
•
Screw the cap nut (item 2) on the setting screw end and tighten so to assure
the tightness.
Pneumatic closing operation
The oil flows from the hydraulic cylinder chamber, head flange side, via the flow regulator
(Fc), the valve (D) and the flow regulator (Fa), free flow direction, to the hydraulic
cylinder chamber, rear flange side.
The missing oil volume, corresponding to the piston rod of hydraulic cylinder, is sucked
from the oil tank via the check valve (Cv).
The flow regulator (Fc) allows the setting of the actuator operation speed in closing,
independently from the actuator speed in opening.
