4.2.4 Reassembling the screen
1) After cleaning the screen (19), turn it clockwise and attach it to the cover (2), and
tighten it.
When tightening, as the screen will break easily, so it must be handled with care.
2) If the screen (19) is damaged, never fail to replace it with a new one.
4.2.5 Reassembling the trap
1) Turn the air vent (17) clockwise and attach it to the cover (2), and tighten it.
2) Reinstall the bracket (10) to the cover (2) so that the hole for the set bolt and the hole
for the valve seat (5) are lined up with the holes in the cover (2).
3) Secure the valve seat (5) to the cover (2). In this case, make sure that the set bolt (11)
and the seat gasket (6) are fitted in the right place.
4) Make sure that the spring (8) and the valve (7) are installed in the correct position in
the lever (4) support section.
5) The bracket (10) should be lined up with the hole for the bracket (10). If you do this,
the pin (9) can be inserted easily and the lever (4) will be reinstalled on the bracket
(10) easily.
6) Reinstall the body (1) to the cover (2) so that the name plate (21) should be on the top
side of the body (1). And then tighten the 4 cover bolts (13).
Finally, tighten the bolts in a crosswise pattern to avoid uneven tightening.
* The correct torques for the valve seat (5), set bolt (11), cover bolt (13), and air vent (17)
are shown in the following table.
Model Parts Tools Across the flats Torque
GTH12
Valve seat (5) Torque wrench 17 mm (0.67") 25N・m
Set bolt (11) Allen wrench 5 mm (0.20") 11N・m
Air vent (17) Spanner 17 mm (0.67") 22N・m
Screen (19) Pipe wrench - About 30 N・m
Cover plug （36） Torque wrench 23 mm (0.94") 65N・m
GTH12-5, 16,25,32 Cover bolt (13) Torque wrench 19 mm (0.75") 80N・m
GTH12-45 Cover bolt (13) Torque wrench 24 mm (0.94") 110N・m
Remove any rust and scale from the threaded section and apply the small amount of anti-seizing
agent to it. And then tighten the threaded section with the specified torque.
