A. Remove both stop cap screws (02) together with
nut (04) and washer (03).
B. Remove stop screw o-rings (11) and discard if
replacing all soft parts.
3. End Cap (30, 31) Disassembly, (Figure 5):
A. Remove the end cap bolts (13) in the sequence
shown in
(Figure 5)
.
CAUTION: When disassem-
bling a spring return actuator, the end cap
(30, 31) should be loose after unscrewing end
cap bolts (13) 4-5 turns. If there is still force on
the end cap (30, 31) after 4-5 turns of the end
cap bolt (13), this may indicate a damaged
spring cartridge and any further disassembly
should be discontinued. Further disassembly
of the end-caps may result in serious personal
injury. Return actuator to Metso Automation
for further maintenance.
B. For spring return actuators, remove spring
cartridges (17).
C. Remove end-cap o-rings (14) and discard if
replacing all soft parts.
4. Piston (40) Disassembly, (Figure 6):
A. Holding the body (50) in a vice (or similar device),
rotate the drive shaft (60) until the pistons (40)
are released.
CAUTION: Air Pressure should not
be used to remove the pistons from the body.
Clean and inspect the piston teeth for signs of
wear. Replace piston if wear seems excessive.
B. Remove piston o-ring seal (16) using a screwdriver.
Remove the piston head (15) and piston back (5)
bearings. Discard bearings if replacing all soft
parts.
5. Drive Shaft (60) and Bearing (6, 7) Disassembly,
(Figure 7):
A. Remove spring clip (18) carefully, using snap-ring
pliers. Remove external thrust bearing (8) and
thrust washer (10).
B. Apply downward force to top of drive shaft (60)
until it is partially out of the bottom of the body
(50) and the octi-cam (1) and internal thrust
bearing (8) can be removed. Remove the octi-cam
(1) and internal thrust bearing (8). Push the drive
shaft (60) completely out of the bottom of the
body (50). If the shaft (60) does not move freely,
gently tap with a plastic mallet.
C. Remove the top and bottom shaft bearings (6, 7)
and top and bottom shaft o-rings (21, 22).
Discard if replacing all soft parts.
6. Cleaning and Inspection.
A. When all components are disassembled, those
not being replaced should be properly cleaned
and inspected for wear prior to re-assembly.
4.3 Assembly
Prior to assembly, ensure that all components are clean
and undamaged.
NOTE: (Table 2)
lists the recommended Valv-Powr lubri-
cants.
4
Figure 5
3
30, 31
2
4
1
13
Figure 6
Figure 7
18
1
8
50
8
10
60
50
60
40
40
