Page
5
of
12
4. Mounting to valve
The gearboxes can be operated in any mounting position.
Prior to mounting, the gearbox must be checked for damage. Damaged parts must be replaced
by original spare parts.
After mounting to valve, touch up any possible damage to paint finish.
Check if mounting flange fits the gearbox.
Spigot at flanges should be loose fit!
For output drive type A (figure 2 or 3), the internal thread of the stem nut must match the thread of the
valve stem. If not ordered explicitly with thread, the stem nut is un-bored or with pilot bore when delivered.
For finish machining of stem nut, refer below.
Check whether bore and keyway match the input shaft of valve.
Thoroughly degrease mounting faces of gearbox and valve.
Apply a small quantity of grease to input shaft of valve.
Place gearbox on valve and fasten. Fasten bolts (quality min. 8.8, refer to table 1) evenly
crosswise.
Table: 1 Suggested fastener torques for bolts
Fastener thread size
UNC Metric
Fastener torques ft-lb
[Nm]
Strength class
8.8
A2-80
1/4”
M6
8 [11]
7 [10]
5/16”
M8
18 [25]
18 [24]
3/8”
M10
38 [51]
35 [48]
1/2"
M12
64 [87]
60 [82]
5/8”
M16
158 [214]
148 [200]
3/4"
M20
318 [431]
289 [392]
Finish machining of stem nut (output drive type A):
4.1 GK10.1-The output drive flange must be
removed from the gearbox
Refer to figure 2
Using a 10 mm wrench or similar tool, remove the four fasteners (01)
from the output drive type A of the GK10.1.
Remove the A drive assembly from the bevel gearbox and place on
a suitable clean surface.
Loosen the setscrew (02) using a 3 mm Allen wrench.
Rotate the locking ring (3) counter clockwise to unthread it from the
A drive housing.
Figure 2
