Page Issue 01Chapter - Scheduled Maintenance7:8
VT551 - Maintenance
FILTER REGULATOR UNIT
Comprises of a combined air filter/pressure regulator (A). It is mounted near the fan case on the right
hand side of the machine.
Safety Precautions
The shut off valve must be used when servicing any item on the air system
IN
A
B
C
D
CURRENT TYPE ‘A’ UNIT
(WITH SHUT OFF BALL VALVE ‘C’)
93MA. 017-2
The air filter unit incorporates a semi automatic drain which automatically dumps accumulated water when
the air supply is isolated by the shut off valve (C). It can also be drained by pushing up the drain tube (B)
that protrudes from the underside.
The pressure regulator (A) ensures the equipment is not over pressurised. It is factory set and sealed at
7
.
5 bar (108 psi).
A pressure switch (D) is fitted to illuminate the low air pressure warning lamp on the cab switch panel.
PNEUMATIC CYLINDER MAINTENANCE
Periodically inspect the cylinder rods for damage, blemishes or build up of material such as tar, cement,
paint etc. The rods can be cleaned with fine wire wool and/or spirit and should be kept clean to ensure
long seal life.
HYDRAULIC CYLINDER MAINTENANCE
Observe the notes on damage etc. described under pneumatic cylinders, especially with regard to the
wide sweep brush slewing cylinder on dual sweep machines and the channel brush lift cylinder.
Avoid playing the water washdown hose over the body tip cylinder when in the fully raised condition.
CLEANING THE VEHICLE
With the advent of high pressure steam and washdown equipment, damage can be caused by playing
this equipment onto the electrical control system, paintwork etc. and great care should be exercised when
it is carried out.
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