Specifications

RailCorp Infrastructure Engineering Manual – Signalling
Maintenance Manual
Electric Point Machine Westinghouse Style M70 MKIII TMG E1583
7.3 Fault Finding Chart 3 - Operation of Throw Mechanism Slow or Jerky
Fault
Most Likely
Emergency
Subsequent
Causes
Action
Action
Throw mechanism
operation abnormally
slow or jerky
Machine or rodding
damaged by run-thru or
dragging equipment
Switch slide chairs dry
or fouled by crushed
ballast
Obstruction in throw
mechanism
If practical repair
damaged components.
If not replace
mechanism
Clean and lubricate
chairs
Faulty motor or motor
fails to engage gear box
properly
Remove obstruction.
Check for damage. If
damaged replace part
or point machine
Friction clutch slipping
Worn pins or brushes
on linkages, worn
bearings, gears etc
Faulty toggle
mechanism or
associated motor cut-off
switch(s)
Refurbish damaged
machine if economically
justified. If not
cannibalize for parts
Check brushes and
commutator, re-align
motor. Replace
connecting gear or
motor if necessary
Adjust friction clutch in
accordance with
relevant procedure.
Replace if necessary
Replace worn
components if practical.
If not replace machine
Check toggle action and
replace components or
switch(s) as required
Overhaul machine
Version 1.0 © RailCorp 2009 Page 51 of 52
Issue Date: 1 December 2009 Uncontrolled when Printed