Johnston VT551 - Fan Impeller

 THESE ITEMS HAVE BEEN SPECIFICALLY DESIGNED FOR LO-NOISE EMISSIONS AND FITTING
OF ALTERNATIVE ITEMS COULD CAUSE AN INCREASE IN THE OPERATIONAL NOISE OF THE
MACHINE.
FAN IMPELLER 
INSPECTION -This should be on a regular basis as outlined in the routine maintenance. The impeller
should be replaced as soon as the blade thickness is less than 2mm or the blades have visible signs of
wear/damage.
REMOVAL
1. Raise the body and ensure the body prop is
engaged in the rack.
2. Isolate the battery.
3. Remove the 12 bolts (A) holding on the fan
cover and remove cover (B).
4. Remove the capscrew (C) in the centre of the
fan.
5. The fan impeller should slide off the shaft, a
bearing puller 437-2 can be used if required.
Page Issue 01Chapter - Wearing Items12:2
VT551 - Maintenance
WEARING PARTS REPLACEMENT INSTRUCTIONS
It is important that the following safety precautions are observed when working on the machines.
Ensure the machine is standing on firm, level ground and there are no obstructions above or
to the rear before raising the body.
Ensure the safety prop is engaged at all times when working under the body.
Ensure operators are fully conversant with the controls and operation.
 Isolate the air in the systems locker before working on any pneumatically operated or
controlled equipment.
Disconnect or isolate the vehicle battery when working on the electrical system.
 Do not approach the fan inlet while the fan is running.
 Do not grasp any part of the engine or exhaust system without first ascertaining whether it
has cooled sufficiently to avoid scalding.
 Be aware of the safety instructions relative to the suction fan given in the equipment
maintenance notes.
Keep hands, loose clothing, hair etc. well clear of moving parts.
 Do not climb on the engine walkways unnecessarily or approach the fan inlet whilst the engine
is running.
Do not use ill-fitting tools such as spanners that may slip and cause injury.
 Always get a second person to check periodically that all is well when only one person is
working on the machine or inside the body.
Safety Precautions
93MA. 015-2
(A)
(B)
(C)
(D)
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