R253 Dock Shunter repair (clean and service)
One very common problem
with older Hornby locomotive models is that of poor running especially
at slow speeds. The loco keeps stopping and pausing. The loco becomes
almost unusable and tends to be put to one side. This is especially
true as very often there isn't a clear fault with the loco, everything
is present and seems OK.
This is how we get engines
in this condition running smoothly again.
This great little Dock Authority
loco is complete but runs very poorly, especially at slow speeds. It
keeps stopping. At higher speeds it seems to run better.
are a series of pictures showing how with a simple clean and service
this R253 Dock Authority model Locomotive has been given a new lease
the cover removed, at first glance everything looks present and correct.
Everything is just how it should be and there are no obvious causes for
the poor slow speed operation.
A more detailed inspection
revealed the problem. This level of corrosion and dirt is very common
in locos of this age. Especially those that have not been serviced regularly.
The corrosion might not look much but being present in so many of the
electrical connections it has a large cumulative effect.
In this picture the green
coloured corrosion can be more clearly seen on the X.67 motor brushes,
brush spring and the brush contact strip.
There is also a build up
of carbon dust between the segments of the motor commutator.
At this stage all the electrical
contact faces have been polished to bright shiny metal. This includes;
wheels, axles, contact strip, brush spring, brushes, brush contact,
wheel pick-ups. The picture shows the polished wheels and brushes clearly.
The armature has been checked
for any concerns and any other problems are put right.
The motor magnet is magnetised
in situ in the motor.
The chassis has been cleaned
as has the body of the loco.
The chassis has been reassembled,
lubricated and thoroughly tested at both high speeds, low speeds and
in both directions.
Finally the cover is refitted
and the loco tested again. Perhaps this little R253 Dock Authority shunter
doesn't look too different from the outside but it's track performance
is much improved with the clean and service complete.
Ready for another period
of solid reliable service on the Hornby model railway.