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8.4.3
Maintaining the control stage with a larger diaphragm assembly
Falling components
Cleaning
Tightening torques
Maintaining the
control stage
HON 512 with HON 650 pilot user manual
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 fasteners (screws, washers, etc.) 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
Hex nut
Upper connecting piece
Diaphragm housing screws
Hex nut
Diaphragm cover screws
Base plate screws
Proceed as follows:
Figure
Tightening torque
20 Nm (15 lbs)
20 Nm (15 lbs)
12 Nm (9 lbs)
10 Nm (8 lbs)
12 Nm (9 lbs)
12 Nm (9 lbs)
Step
Description
1
Release the tension on the pilot spring by
loosening the hex flange nut (1) and
unscrewing the spring adjuster (2) a few
turns.
2
Unscrew the diaphragm cover's screws (1).
Maintenance
Step
18
24
34
36
42
46
114
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