Johnston VT651 - Suction Fan Impeller and Casing

Johnston Sweepers Limited
Chapter - Routine Maintenance
Page Issue 01
OG
6:9
V Range 501 ● 651 ● 801 - Operator’s Guide
Suction Fan Impeller and Casing
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.
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 impeller must be replaced when any blade thickness (D)
is less than 2mm. If perforation of the fan case is observed (B)
due to wear erosion, this should also be replaced.
MO2OG-46
A
D
C
B
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 in
accordance with 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.
●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.
Safety Notice
●Ensurethechassis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.
Safety Notice
VT - Twin Engine
VS - Single Engine
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