VAG Operating and maintenance instructions • 10
7.3.2 Replacing the profile sealing ring
(Position 1.2)
• Open the VAG RIKO
®
Plunger Valve completely up to the limit
stop.
• Unscrew the hexagon socket head cap screws (1.5) and the
retaining ring (1.3).
• Clean the parts thoroughly.
• Replace the profile sealing ring (1.2).
• Apply a thread locking substance on the hexagon socket head
cap screws (1.5) and tighten them according to table 4.
7.3.3 Replacing the quad O-ring (Position 1.4)
• Dismantle the VAG RIKO
®
Plunger Valve as described in 7.3.2.
• Unscrew the hexagon socket head cap screws (2.10) within the
plunger piston.
• Remove the retaining ring / push rod bearing (2.9).
• Remove the plunger (4). The crank drive (crank, piston rod and
piston rod bearing) remains in the valve.
• Clean the parts thoroughly.
• Replace the quad O-ring (1.4).
• Re-assemble in reverse order. Tighten the screws according to
table 4.
7.3.4 Replacing the O-rings
(Position 1.10 and 1.1)
• Dismantle the VAG RIKO
®
Plunger Valve as described in 7.3.2.
• Unscrew the gear box nuts (8).
• Unscrew the hexagon cap screw (1.12) and remove the bearing
flange (1.6).
• Remove the crank shaft (3.1) together with the thrust washer
(1.8).
• Remove the bearing bush (1.7).
• Clean the parts thoroughly.
• Replace the O-rings (1.10 and 1.11).
• Re-assemble in reverse order. Tighten screws according to ta-
ble 4.
• Observe the position of the bearing bush (1.7). The shoulder of
the bearing bush must show towards the gear box.
• Attention: Insert the hexagon cap screws (1.12) only to adjust
the shaft with the bearing.
• Tighten the screwed connection with the threaded pins (1.13).
• Continue re-assembling in reverse order.
• Re-install the gear box.
• Tighten the gear box nuts (8) according to table 4.
• Re-adjust the limit stops of the gear. (See operating instructions
for AUMA worm gears)
Picture 5: Detail view
DN
M6
M8
M10
M12
M16
M20
M24
M30
M36
M42
M48
1.5 Cylinder screw, retai-
ning ring, body
5
10
20
35
80
160
300
-
-
-
-
1.12 Hexagon cap screw,
bearing cover
4
8
15
25
60
120
-
-
-
-
-
1.13 Threaded pin, bearing
cover
4
8
15
25
60
-
-
-
-
-
-
2.10 Hexagon socket head
cap screw, retaining ring,
piston
5
10
20
35
80
160
300
580
1000
1600
2500
8 Nut, gear box
-
-
35
60
150
290
500
950
1650
-
-
Table 4
1.7
3.1
1.10 1.12
1.10
1.11
1.13
7.3.5 Tightening torque for the screws in [Nm]
