Fisher D500243X012 - Manual (Page 17)

Instruction Manual
D500243X012
1035/El-O-Matic Actuator
August 2012
17
Note
Some constructions do not have a housing adjustment screw. If your construction does not use the adjustment screw, install the
drive shaft, and go to step 6 below.
5. Note the alignment of the cam with respect to the housing adjustment screw while installing the shaft into the
body. Install the drive shaft.
6. Install the washer, thrust washer, and spring clip (keys 27, 21 and 35) onto the drive shaft. Use the pin spanner
carefully to install the spring clip.
7. Go to the Installing Pistons steps below.
P Series Actuators (without a 1080) use a Limit Stop Plate (see figure 4) for travel stops. The cam for the travel stops is
mounted on the actuator after the actuator is fully assembled.
1. Replace the top and bottom shaft bearings in the actuator body. Install the O-ring and guide bushing in the shaft.
The guide bushing may have to be cleaned of grease, rolled tightly around the drive shaft and held in place while
inserting into the actuator housing.
2. Insert the small end of the drive shaft (key 5) into the bottom of the actuator housing.
3. Install the thrust washer, and spring clip (keys 21 and 20) onto the drive shaft. Use the pin spanner carefully to
install the spring clip.
Installing Pistons
Figure 7 shows the alignment of the slot in the top of the shaft with the pistons for code A constructions. See figure 3
for piston and slot alignment for other constructions.
1. Install the O-ring and guide bushing on both pistons. For P Series actuators: you will need to install the gear racks on
the pistons if they were removed.
2. Lightly lubricate parts and inside of actuator bore before final assembly.
3. If you have not already done so, follow the steps in the Installing the Drive Shaft section.
4. Very carefully align the pistons square to the actuator housing.
5. Align the drive shaft so that the teeth on the center gear will “pick-up” the piston assembly rack teeth when turning
the top extension of the center gear clockwise.
To ensure proper meshing of teeth, rotate the index mark on the drive shaft 45 degrees beyond the open mark on the
top of the housing.
Note
Figure 3 shows the different orientation of the piston in relationship to the slot in the shaft, versus the actuator body.
6. With the piston assemblies in the actuator body, gently push them simultaneously into the housing. Turn the top
shaft extension clockwise. At the proper point of engagement between the center gear and piston assemblies, both
piston assemblies will move toward the center of the housing.
7. Once the drive shaft and pistons are properly engaged, ensure smooth movement at 90 degree operation can occur
without moving the pistons out of the actuator body. Do this by turning the top shaft extension to the closed
position and back a few times.