To reduce excessive body roll due to poor track conditions, extra bearing pads were fitted to the outside of the bogie frame and the main frame.
22.
At the same time, the affected bogie frame was sent to Mitsubishi Heavy Industries in Japan for a detailed analysis in order to establish the root cause.
23.
Major construction was carried out at Dandenong, with bogie frames fabricated at Granville, and final fit out and commissioning occurring at the M & MTB's Preston Workshops.
24.
A reaction link on the rear bogie of the leading power car became separated from the bogie frame, leading to catastrophic failure of the transmission assembly with parts impacting the track.
25.
The bogie frame has a single central cross member which supports via pivots two longitudinal beams ( in a'weighing scale'arrangement ) connected to the wheelset via the primary suspension.
26.
A feature in the design of the leading bogie was that the bogie frame was a single steel casting, to which the cast steel horns were bolted to take the axle boxes.
27.
In this case the pulse generator has to be mounted on a shaft stub attached to the wheelset and fitted with a torque converter connected to the bogie frame to prevent it from rotating.
28.
Between the axle and the bogie frame was a series of C-shaped steel leaf springs stacked inside each other for the basic suspension, with rubber sheets between the leaves providing some shock absorption.
29.
Their annual mileage of up to, and the faster and heavier trains, for which these units had not been designed, meant increasing wear damage to the control units, traction motors, and bogie frames.
30.
The joint statement also said that both LTA and SBS Transit as well as the manufacturer will redesign and strengthen the bogie frame structures, which will be applied to all 57 trains including the newer C810A trains.
