Manual HD EN
0908e
Modifications reserved. Date 03.2017.
No guarantee for accuracy.
Older data sheets are invalid.
7) DISASSEMBLING
INSTRUCTIONS
Warning:
Appropriate lifting equipment may be used.
7.1)
Power Module (Air or Oil module) disassembly:
7.1.1)
Before removing the power module, make sure that the actuator is in end of stroke position (only for Spring Return actuators);
for actuator with central stroke adj. - OPTION „A“ / fi g. 5: unscrew the both nuts (103) and completely unscrew both the stop cap screws (102).
for actuator with external stroke adj. - OPTION „B“ / fi g. 6: unscrew the cover (50), remove the adjusting nut (49) and completely unscrew the travel adjustment screw (48).
7.1.2)
For standard power module, progressively loosen all the screw until the end cylinder fl ange (41) is relieved from all the tension. Completely unscrew all the screw.
7.1.3)
Only for actuators OPTION „C“ / fi g. 7 - Progressively loosen all the nuts (56) of the tie rods (45) until the fl ange is relieved from all the tension. Completely unscrew all the
nuts
(56)
Warning:
After loosening all the nuts/screw by 2/3 revolutions, make sure that the fl ange is not in tension. Otherwise, check that you have correctly followed the steps
indicated in paragraph 7.1.1 and 7.1.2.
7.1.4)
Remove the end cylinder fl ange (41)
7.1.5)
Only for actuators with OPTION „C“ / fi g. 7, remove the tie rods (45) and disengage the power cylinder (42) from the piston (44).
7.1.6)
Remove the position indicator from the Central Module unscrewing the screws (22)
7.1.7)
Remove the cover (2) of the Central Module unscrewing the screws (23); it may be necessary to lever with one or more screwdrivers.
7.1.8)
Remove the cover gasket (12)
7.1.9)
By holding with a key the piston shaft (43) inside the central module, unscrew the nut (47) completely then remove the piston (44) from the piston shaft.
7.1.10) Disengage the piston shaft (43) from the Central Module. Pay attention to not damage the pin of the piston shaft (3).
7.1.11) Unscrew the screws and disengage the power cylinder (42).
7.1.12) Unscrew the hexagonal screws (21) between the Central Module and the cylinder connection fl ange (40).
7.1.13) Remove the cylinder connection fl ange (40).
7.1.14) Remove the module gasket (13).
7.1.15) If seals and the sliding parts are damaged, they shall be replaced during the maintenance, while a lubrication may be necessary for mechanical parts. (see table 02)
7.2) Spring
Module:
7.2.1)
Before removing the Spring Module, make sure that the Power Module (if any) is not pressurized and that all connections have been removed;
see warning in paragraph 7.
7.2.2)
From the inside of the Central Module, unscrew the hexagonal screws (21) from the Spring Cylinder (80).
7.2.3)
Separate the whole Spring Module from the Central Module; do not damage the sleeve during (M7) the disengagement of the shaft spring (83).
7.2.4)
Remove the gasket of the module (13).
Warning:
Do not perform any kind of operation on the Spring Module. If necessary, for maintenance or other operations please contact AIR TORQUE.
7.3)
Central Module disassembly:
Before proceeding, make sure that the Central Module is isolated from the other modules. If necessary, follow the steps as per paragraph 7.1) and 7.2).
7.3.1)
Removing the adjustment screws (only for Double Acting actuators with external stroke adjustment -option „B“ / fi g. 6).
7.3.1.1) Unscrew the nut (49)
7.3.1.2) Completely unscrew the adjustment screw (48)
7.3.1.3) Unscrew the hexagonal screws (21) of the connecting plate DA from the inside of the Central Module, if any
7.3.1.4) Remove the plate DA (100), if any 7.3.2) Disassembling of the Central Module
7.3.2.1) Disengage the guide bar (7) from the Central Module and from the Mechanism Unit (M)
7.3.2.2) Remove the Mechanism Unit (M) from the Central Module
7.3.2.3) Pull out and separate all the components of the Mechanism Unit (M)
Perform the maintenance of the mechanical parts using lubricant, replace the seals and the sliding parts, if they are damaged or if it is necessary (see table 02).
8)
ASSEMBLING INSTRUCTIONS
Before performing the assembly, make sure that:
•
All the components are clean and in good condition
•
The spare parts and the lubricant used are suitable for the operating temperature of the AT-HD series actuator (please see AIR TORQUE data sheets).
Note: The lubricants suitable for the different operating temperatures (Standard actuators S, H and L), are available in AIR TORQUE.
Warning: during the assembly, pay attention to the placement of the Power and Spring Modules referred to the Central Module for a correct rotation direction of the actuator
(see par. 4, Operating function androtation direction).
8.1) Central
Module:
8.1.1)
Reassemble the Mechanism Unit (M)
8.1.2)
Screw the mechanism plug (101) into the threaded hole of the Mechanism Unit (only for Double Acting actuators). This step must be performed also for the conversion
of a Spring Return actuator into a Double acting actuator.
8.1.3)
Carefully insert the Mechanism Unit (M) in the proper housing of Central Module. 8.1.4) Insert the guide bar (7) in the Central Module engaging it in the Mechanism
Unit.
8.2)
Spring Module (only for Spring Return actuators):
8.2.1)
Place the module gasket (13) in the center of the sleeve (M7)
8.2.2)
Insert the shaft (83) of the spring in the Central Module; do not damage the sleeve (M7).
8.2.3)
Insert the cylindrical end part of the shaft (83) in the Mechanism Unit (M).
8.2.4)
Place in position the Spring Module and screw the hexagonal screws (21) from the inside of the Central Module, to fi x the Spring Module to the Central Module.
8.3) Power
Module:
8.3.1)
Place the module gasket (13) in the center of the pin (3)
8.3.2)
From the inside of the Central Module, screw the hexagonal screws (21), between the Central Module and the Power Module, in the head fl ange (40)
8.3.3)
Insert the cylinder (42) on the cylinder connection fl ange (40); progressively screw all the screw in the cylinder connection fl ange (40)
8.3.4)
Insert and fi x the piston shaft (43) in the mechanism unit and the piston (44), by screwing the piston nut (47)
8.3.5)
only for actuator with OPTION „C“ / fi g. 7: screw the tie rods (45) into the cylinder connection fl ange of the Power Module (40), and insert the cylinder (42) on the
piston
(44)
8.3.6)
Place the end cylinder fl ange (41)
8.3.7)
Progressively tighten all the screws or the nuts (56), depending by the optional module type.
8.3.8)
for actuator with external stroke adjustment - OPTION „B“ / fi g. 6: screw the adjustment screw (48) in the end cyl. fl ange (41) with the adjustment nut (49). Assemble the
cover, if any, of the screw (50) after the stroke adjustment (see par. 9).
8.3.9)
for actuator with central stroke adjustment - OPTION „A“ / fi g. 5: Screw in the Central Module the stop cap screw (102) with the nut (103); adjust the stroke (see par. 9).
HEAVY-DUTY
Scotch-Yoke Pneumatic Actuators
MANUAL