
23
J125: Maintenance Instructions
Safety Shut Off Units - Continued
Safety Shut-off Rebuilding Procedures – Continued
19.
Replace bottom spring holder (54) together with UPSS screw (56) if fitted, into chimney of top cover (60) by
aligning ribs of bottom spring holder (54) with slots in top cover (60).
20.
Replace OPSS spring (57), or UPSS spacer tube (93), into bottom spring holder (54).
21.
Screw top spring holder (52) into chimney of top cover (60) ensuring that castellated spigot is uppermost. If
UPSS spacer tube (93) is fitted, screw top spring holder (52) down firmly.
22.
If fitted locate UPSS spring (51) into recess in top diaphragm plate (87), refit UPSS spring holder (59) ensuring
that spigot locates in UPSS spring (51).
23.
Replace top cover assembly (60) and secure with four screws (88), ensuring UPSS spring arrangement (51)
and (59) if fitted is undisturbed. Take care not to pinch diaphragm bead (85).
24.
Fit new "O" ring (53) to top cap (55) and screw into chimney of top cover (60).
25.
If removed, replace test point (74).
26.
For reassembly to body see page 18.