RT655 Operator’s Guide
OG6:10
Chapter - Routine Maintenance
Page Issue A
Suction Fan Impeller and Casing
In operation the impeller and casing can be subjected to wear in the form of erosion
resulting from dust or small abrasive particles passing through the fan system and must
be inspected as instructed in the Weekly Maintenance Schedule.
In cases where excessive dust could pass through the system, these inspections should be made
more frequently, the blades should be clean of any debris (C) to prevent dirt build up and premature
failure due to vibration.
Remove the 2 setscrews (F) and remove
the inspection plate (G). The impeller blades
can be seen through the inspection port and
the blades cleaned with a scraper (part no.
283665-1) if required.
If the impeller is subjected to excessive wear,
disintegration could occur whereby the front
shroud plate detaches itself from the driving
plate as a result of the high rotational forces
within the component. Any wear occurring to
the impeller is usually shown up as a thinning
of the blades generally in a broad wear pattern
(A). Once apparent thinning of the impeller
blades is observed, the component must be
replaced when any blade thickness (E) is
less than 2mm. If perforation of the fan case
is observed (B) due to wear erosion, this
component should also be replaced to prevent
pollution of the fan compartment with dust.
Refit the inspection plate securely after inspection / cleaning.
Filter Screens and Roof Duct
The body filter screen (Item 15, Fig.1) and roof duct must be kept clean, otherwise suction
performance can be affected. The screen can be cleaned in situ, but it is preferable to remove it.
To remove, release the linch pin, which will allow the screen to swing down, disconnect the air pipe
to the mesh shaker unit if fitted. The screen can then be lifted out of the hooks on the rear sloping
panel for thorough cleaning. Also hose out the roof ducts to ensure they are clean while the filter
screen has been lowered.
Ensure the auxiliary engine is not running and isolated before fan maintenance
or replacement is attempted.
The fan impeller is finely balanced as an assembly in manufacture.
NEVER remove or replace the hub, or carry out repairs to it.
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