TECHNICAL MANUAL MT103
49
DISASSEMBLING GROUP PILOT
46) Disconnet the connectors between the pilot 204/A/FO and the preregulator R14/A/FO, unscrewing the
tapered seal connectors.
DISASSEMBLING THE PILOT 204/A/FO (Fig. 27)
47) Slacken the lock nut .
48) Slacken the adjustment screw for its complete stroke by turning it anticlockwise.
49) Removethe pilot plug .
50) From the pilot, remove the spring support , the spring and the spring support .
51) Slacken the screw and remove the sleeve and the pilot bracket .
52) Unscrew the lock nut, and remove the protection disc and the bottom diaphgram
.
53) Slacken the screws and remove the pilot cover along with the spring .
54) Unscrew the pilot nut and remove the spring , the pilot obturador , the protection disc
and the top diapragm .
55) Unscrew the lock nut from the valve seat .
56) From the pilot body remove the shaft of the valve seat along with the diaphragm support .
57) Clean and carefully check that the valve seat is in good condition.
58)
Replace all the components wich are part of the spare parts kit.
REASSEMBLING THE PILOT 204/A/FO
59) On the pilot body , reassemble the shaft of the valve seat , putting the diaphragm support
between them.
60) Screw the lock unit .
61) Reassemble the bottom diaphragm , the protection disc and screw in the pilot lock nut .
62) Insert the pilot obturator , the spring , the top diaphragm and the protection disc .
63) Screw in the pilot nut .
64) Centre the valve seat shaft and diaphragm support secure the nut .
65) Reassemble the pilot cover along with the spring and fix the screws .
66) Reassemble the sleeve and the pilot bracket and secure it by screwing in the screws .
67) Position the spring support , the spring , and the spring support and fix the pilot plug .
DISASSEMBLING THE PRE-REGULATOR R14/A/FO (Fig. 28)
68) From the pre-regulator body , remove the cover , slackening the screws .
69) Remove the diaphragm obturator assembly and the spring .
70) Separate the diaphragm assembly and obturator , unscrewing the lock nut .
71) Unscrews the pre-regulator plug .
72) From the pre-regulator body , remove the pre-regulator plug , the reinforced gasket , the filter
the obturator guide and the guide ring .
73) Clean and carefully check that the obturador is in a good state.
74)
Replace all the components which are part of the spare parts kit.
9
10
8
7
22
13
24
6
14
25
5
16
24
1
20
2
17
16
21
25
15
4
3
5
3
4
3
5
25
16
15
25
17
21
15
2
5
20
1
24
6
14
24
13
22
7
8
1
2
15
12
10
5
16
4
1
4
9
13
3
8
5
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