Ingersoll-Rand 7120 - Manual (Page 52)

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7/120 (P425AWIR), 9/110 (XP375AWIR), 10/105 (HP375AWIR), 14/85 (VHP300AWIR),
7/170 (P600WIR), 10/125 (HP450WIR), 14/115 (VHP400WIR)
. anyone entering the machine is aware of the reduced level
of protection and the additional hazards, including hot surfaces
and intermittently moving parts.
. the machine cannot be started accidently or otherwise, by
posting warning signs and/or fitting appropriate anti–start
devices.
Prior to attempting any maintenance work on a running
machine, ensure that:–
. the work carried out is limited to only those tasks which
require the machine to run.
. 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.
. 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.).
. appropriate personal protective equipment is worn.
. loose clothing, jewellery, long hair etc. is made safe.
. 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:–
. the machine is suitably tested.
. all guards and safety protection devices are refitted.
. all panels are replaced, canopy and doors closed.
. 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:
. Start the machine.
Note: Do not press the load button.
. Disconnect the switch, the machine should shutdown.
. Re–connect the switch.
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).
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
1 /
2
to 3 /
4
of a revolution.
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).