KONE Maintenance Method
MX10 / MX20 MCP Procedures - ASME A17.1-2013 / CSA B44-13
© 2014 KONE Corporation PSK8-604-MX10/MX20
All rights reserved.
45 (-) 2014-12-15
Check the flyweights and springs (OL100 and OL120)
Procedure Note
1. Check the springs.
A broken spring can cause unnecessary
tripping of the overspeed governor. Dirty/rusty
springs may increase the tripping speed!
2. Check the operation / vertical (radial)
movement of the flyweights manually:
• Pull flyweights outwards.
• Check that the both eccentric wheels touch
the tripping wheel (Picture A).
• Let the flyweights close by themselves.
They MUST return easily without extra
friction (Picture B).
Check lateral movement of the flyweights while
the elevator is running.
The flywheel MUST not touch the governor
pulley (Picture C) or the tripping wheel
(Picture D).
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