Johnston VT651 - Nozzle Adjustment

Chapter - Routine Maintenance
Page Issue 01
OG
6:8
V Range 501 ● 651 ● 801 - Operator’s Guide
NozzleAdjustment
In order to maximise the performance of the machine It is important that a working clearance
is maintained between the nozzle rubbers and the road surface. The following settings are
recommended as a guide although some conditions may require a tighter front nozzle setting.
Adjustment is carried out with the Maxigap/Varagap in the closed position.
Rear Nozzle Rubber.
Recommended ground clearance
8-10mm.
Adjustment.
Raise or lower the carriage wheels (B)
as required.
Front Nozzle Rubber.
Recommended ground clearance
35-40mm.
Adjustment.
Raise or lower the chain link (A) as
required.
The rear nozzle rubber should always
be approximately 8-10mm from the
ground to allow for the road camber. An
average gap setting between the front
nozzle rubber and the ground has been
found to be 35-40mm for most sweeping
conditions. These adjustments may become necessary as nozzle rubbers and tyres wear.
There must always be sufficient extension (75-100mm) capability in the nozzle trunking and
the nozzle lift cylinder to ensure that the nozzle does not become suspended when passing
over road surface depressions. The attachment of the nozzle lift cylinder to the trunking
bracket may be adjusted downwards by the clamped ‘U’ bolt (C).
Additional adjustment is provided to alter the draw bar height/position. Normally the centre
hole is utilised. Repositioning setscrew (D) into a lower hole raises the front of the nozzle,
or into a higher hole lowers the front of the nozzle.
The Maxigap feature (E) opens the nozzle aperture to allow for the ingestion of bulky
objects.
M02OG-053
35-40mm8-10mm
A B
C
D
E
●TheuseofNeedlestickglovesisrecommendedwhenworkingwiththisequipment
Safety Notice
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