MAINTENANCE
22
7/71, 12/56
High discharge air temperature switch(es).
At twelve month intervals, test the air discharge temperature
switch(es) by removing it from the machine and immersing in a bath
of heated oil. The switch should operate at 120C. Refit the switch.
High water temperature switch
At twelve month intervals, test the water temperature switch by
removing it from the machine and immersing in a bath of heated
oil. The switch should operate at 105C. Refit the switch.
Alternator/drive belt failure circuit.
At twelve month intervals test the alternator drive belt failure circuit
as follows:
. Remove the drive belt from the machine.
. Turn the key switch to position 1, the alternator charge light will il-
luminate.
. Turn the key switch to position 3 (engine start position).
. The machine should shutdown when the key switch is returned to
position 1.
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).
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
Examine the filter element. Examine all hoses and tubes, and
replace if necessary.
Reassembly
Thoroughly clean the orifice/drop tube and filter gasket contact area
before reassembly. Install the new element.
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