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8.5
Maintaining the pilot
Contents
8.5.1
Maintenance for imperial HON 640a / metric HON 640a with diaphragm
measuring unit
Falling components
Cleaning
Tightening torques
Maintaining the pilot
HON 5020 gas pressure regulator with HON 640a / HON 642a pilot
Topic
Maintenance for imperial HON 640a / metric HON 640a with diaphragm measuring unit 52
Maintenance for imperial HON 640a with metal bellows measuring unit
Maintenance for imperial HON 642a with diaphragm measuring unit
Crush and impact hazard posed by components falling or toppling over accidentally.
When working with heavy components that have been removed or are yet to be installed,
injury may result if the components start moving in an uncontrolled manner, e.g., fall down
from the working surface or topple over.
Place removed components exclusively on level, horizontal working surfaces with enough
load-bearing capacity.
If necessary, secure removed components so that they will not fall or topple over.
Wear the required personal protective equipment.
Exercise caution when performing the relevant tasks.
Observe the following cleaning instructions:
Before assembly, all parts must be cleaned in order to remove any foreign particles
(swarf) and soiling.
If screws, bolts, or washers are replaced with identical new parts, any oil on these new
parts must first be removed.
Observe the tightening torques below when following the instructions in this section:
Part
Closing cap
Hex nut
Hex bolt
Hex bolt
Proceed as follows:
Figure
Tightening torque
20 Nm (15 ft lbs)
12 Nm (9 ft lbs)
12 Nm (9 ft lbs)
12 Nm (9 ft lbs)
Step
Description
1
Remove the locking screw (1) by unscrew-
ing it.
2
Remove the O-ring (2) and replace it with a
new one.
3
Check the filter cartridge for damage and
replace it with a new one if necessary.
4
Lubricate the thread surfaces. Re-install the
filter insert.
Maintenance
Page
60
70
Step
29
31
40
44
52
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