Specifications

RailCorp Infrastructure Engineering Manual – Signalling
Maintenance Manual
Electric Point Machine Westinghouse Style M70 MKIII TMG E1583
7.2 Fault Finding Chart 2 - Switch Fails to Lock in Normal or Reverse Position
Fault
Most Likely
Emergency
Subsequent
Causes
Action
Action
Point machine fails to
lock in normal or
reverse positions
Damage by run –
through or dragging
equipment etc
Point machine not
secure on mounting
Tight heel blocks, rail
brace or chairs.
Switches loose or out of
alignment, track
movement
If practical repair
machine &/or rodding,
otherwise replace
Secure mounting bolts
Threaded adjustment
on lock rod loose
Arrange the civil
maintainer to replace
heel blocks, realign or
tighten switches (often
rectified by running
back, cutting, welding)
Loose connections on
extension pieces (ie
cradle on point front rod
etc) or wear in pins and
bushes
Worn components in
point machine
Excessive spring in
switch
Refurbish damaged
machine if economically
justified. If not
cannibalize for parts
Incorrect adjustment of
lock slides
Adjust lock rod length
and tighten fixings
Check and tighten bolts.
Replace if necessary.
Replace worn pins and
bushes
If practical replace worn
components. If not,
replace machine
Adjust drive rod
connection to cradle
Adjust lockslides in
accordance with
relevant procedure
Organise the civil
maintainer to replace
defective timbers if
required
Overhaul replaced
machine
Version 1.0 © RailCorp 2009 Page 50 of 52
Issue Date: 1 December 2009 Uncontrolled when Printed