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Prior to attempting any maintenance work on a running
machine, ensure that:−
S the work carried out is limited to only those tasks which require
the machine to run.
S the work carried out with safety protection devices disabled or
removed is limited to only those tasks which require the machine
to be running with safety protection devices disabled or removed.
S all hazards present are known (e.g. pressurised components,
electrically live components, removed panels, covers and
guards, extreme temperatures, inflow and outflow of air,
intermittently moving parts, safety valve discharge etc.).
S appropriate personal protective equipment is worn.
S loose clothing, jewellery, long hair etc. is made safe.
S warning signs indicating that Maintenance Work is in Progress
are posted in a position that can be clearly seen.
Upon completion of maintenance tasks and prior to returning
the machine into service, ensure that:−
S the machine is suitably tested.
S all guards and safety protection devices are refitted.
S all panels are replaced, canopy and doors closed.
S hazardous materials are effectively contained and disposed of.
PROTECTIVE SHUTDOWN SYSTEM
Refer to the Wedge diagnostic display codes table for a listing of
shutdown conditions.
LOW ENGINE FUEL LEVEL SWITCH.
At three month intervals, test the low engine fuel level switch circuit as
follows:
S Start the machine.
Note: Do not press the load button.
S Disconnect the switch, the machine should shutdown.
S Re−connect the switch.
S At twelve month intervals, test the low engine fuel level switch by
removing and operating the float manually.
CAUTION: Never remove or replace switches when the
machine is running.
SCAVENGE LINE
The scavenge line runs from the combined orifice/drop tube in the
separator tank, to the orifice fitting located in the airend.
Examine the orifice, check valve and hoses at every service or in
the event of oil carryover into the discharge air.
It is good preventative maintenance to check that the scavenge line
and tube are clear of any obstruction each time the compressor
lubricant is changed as any blockage will result in oil carryover into
the discharge air.
COMPRESSOR OIL FILTER
Refer to the MAINTENANCE CHART in this section for the
recommended servicing intervals.
REMOVAL
WARNING: Do not remove the filter(s) without first
making sure that the machine is stopped and the
system has been completely relieved of all air
pressure. (Refer to STOPPING THE UNIT in the
OPERATING INSTRUCTIONS section of this manual).
MAINTENANCE
Clean the exterior of the filter housing and remove the spin−on
element by turning it in a counter−clockwise direction.
INSPECTION
Examine the filter element.
CAUTION: If there is any indication of the formation of
varnishes, shellacs or lacquers on the filter element, it is
a warning that the compressor lubricating and cooling oil
has deteriorated and that it should be changed
immediately . Refer to LUBRICATION later in this
section.
REASSEMBLY
Clean the filter gasket contact area and install the new element by
screwing in a clockwise direction until the gasket makes contact with
the filter housing. Tighten a further
CAUTION: Start the machine (refer to PRIOR TO
STARTING and STARTING THE UNIT in the
OPERATING INSTRUCTIONS section of this manual)
and check for leakage before the machine is put back
into service.
COMPRESSOR OIL SEPARATOR ELEMENT
Normally the separator element will not require periodic maintenance
provided that the air and oil filter elements are correctly maintained.
If, however, the element has to be replaced, then proceed as follows:
REMOVAL
WARNING: Do not remove the filter(s) without first
making sure that the machine is stopped and the
system has been completely relieved of all air
pressure. (Refer to STOPPING THE UNIT in the
OPERATING INSTRUCTIONS section of this manual).
S Disconnect all hoses and tubes from the separator tank cover
plate. Remove the drop−tube from the separator tank cover plate
and then remove the cover plate. Remove the separator element.
INSPECTION
S Examine the filter element. Examine all hoses and tubes, and
replace if necessary.
REASSEMBLY
S Thoroughly clean the orifice/drop tube and filter gasket contact
area before reassembly. Install the new element.
WARNING
Do not remove the staple from the anti−static
gasket on the separator element since it serves to
ground any possible static build−up. Do not use
gasket sealant since this will affect electrical
conductance.
S Reposition the cover plate, taking care not to damage the gasket,
and replace the cover plate screws tightening in a criss−cross
pattern to the recommended torque (refer to the TORQUE
SETTING TABLE later in this section).
S Engage the adaptor in the cover plate with the drop−tube integral
with the filter, reconnect all hoses and tubes to the separator tank
cover plate.
S Replace the compressor oil (refer to LUBRICATION later in this
section).
31
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