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Maintenance
83
12.3.4 Tightening Torques for Locking Screws and Bleed Valves on the Gearboxes
NOTE
The tightening torques only apply to assembly of locking screws, viewing glasses, ventilation
and breather filters and bleed valves in gearboxes with cast housings or aluminium or steel
housings. The term “locking screw” includes the drain plug, the inspection screw as well as the
ventilation and breather filters.
This table applies only to locking screws with external hex in connection with copper
seal ring for bleed valves made of brass with shaped seal ring.
Thread Locking screw and viewing glass
with copper ring*)
Ventilation/breather filter made of
steel
Bleed valve made of brass
Ventilation and breather filter made
of brass
Steel and cast Aluminium Steel and cast Aluminium
Maximum tightening torque (Nm) (±10%)
M10x1 8
M12 x 1.5 14
G1/4“ 14
M14 x 1.5 16
M16 x 1.5 45 40 24 24
M18 x 1.5 50 45 30 30
M20 x 1.5 32
G1/2“ 32
M22X1.5 35
M24x1.5 60
G3/4“ 60
M33x2 80
G1“ 80
M42x1.5 100
G1 1/4“ 100
*) Always replace copper rings