Kone MX20 - Check the Flyweights and Springs (Governor)

KONE Maintenance Method
MX10 / MX20 MCP Procedures - ASME A17.1-2013 / CSA B44-13
© 2014 KONE Corporation PSK8-604-MX10/MX20
All rights reserved.
41 (-) 2014-12-15
Check the flyweights and springs (OL35)
Procedure Note
Check the springs
A broken spring can cause unnecessary
tripping of the overspeed governor.
Dirty/rusty springs may increase the tripping
speed!
Check the operation / vertical (radial) movement
of the flyweights manually:
• Pull flyweights outwards
• Check that both of the eccentric wheels touch
the tripping wheel (Picture A below)
• Let the flyweights close by themselves.
They MUST return easily without extra friction
(Picture B below)
• Check lateral movement of the flyweights
while the elevator is running:
• The flywheel MUST not touch the governor
pulley (Picture C below) or the tripping wheel
(Picture D below)