Page Issue 01
Chapter - Wearing Items
12:4
VT551 - Maintenance
INTAKE DUCT
These parts are also abraded by the material being conveyed from the suction nozzle and must be
periodically inspected and replaced when worn or holed. The duct is 250mm diameter.
REMOVAL
Enter body after carrying out the same precautions as for
intake flap replacement. Remove the four bolts securing
the collar (A) around the intake duct (B). Lift up the flap
manually (if fitted) and remove collar. A rubber cord (C)
will now be visible which should also be removed with care
to prevent damage. Dismount from body. Tip body and
support on prop. Remove the four bolts in the square flange
carrying the flexible trunking seat seal (D). The intake duct
can now be pulled downwards clear of the body.
REFITTING
Reverse of removal procedure, but if fitting a new duct a
new trunking seat seal should be used and secured using a
contact adhesive, Part No. 9903. Fit two bolts in diagonal
holes, the duct (B) has two holes with keyhole slots. Align
slots over the bolt heads and twist. Fit the other two
bolts and tighten. The rest is the reverse of the removal
instructions. Replace the rubber cord (C) and collar plate
(A) inside the body and secure. Finally, fully tighten the four
duct top retaining bolts.
NB :
Torque for brass M12 bolts 22 Nm (25ft. lbf.).
FLEXIBLE INTAKE TRUNKING
REMOVAL
Lower suction nozzle to the ground, release worm drive clips at either end and remove trunking. The
nozzle trunking has an inside diameter of 250mm.
REFITTING
Loosely fit worm drive clips to either end of trunking. Engage trunking onto the nozzle with a 55mm (2”)
overlap and tighten clip. Fit other end to the intake seat and secure. Check trunking is not twisted or
rucked and does not foul anything when the nozzle is raised or lowered again.
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