Maintenance
HON 670 / HON 671 Controllers Component Documentation
20
Observe the tightening torques below when following the instructions in this section:
Part
Tightening torque
Step
Task
Screws of pilot spring
cover
12 Nm (9 ft lbs)
4
Replace the O-ring of the pilot
spring cover
Cap nut
20 Nm (15 ft lbs)
5
Assembling the double dia-
phragm system
Hex nut
20 Nm (15 ft lbs)
6
Assembling the double dia-
phragm system
Baseplate screws
12 Nm (9 ft lbs)
7
Mounting the controller
Screws of bottom cover
12 Nm (9 ft lbs)
8
Mounting the controller
Proceed as follows:
Figure
Step
Description
1
Unscrew the 4 screws (1) on the
baseplate.
2
Remove the baseplate (1).
3
Replace the 4 O-rings (1) with 4 new,
lubricated O-rings. Bear in mind that the
O-rings differ.
Note: See the appendix for the lubricants
to be used.
Tightening torques
Replace O-rings of the
baseplate
