MAINTENANCE
33
7/20, P65
ROUTINE MAINTENANCE
This section refers to the various components which require
periodic maintenance and replacement.
The
SERVICE/MAINTENANCE CHART
indicates the various
components’ descriptions and the intervals when maintenance has to
take place. Oil capacities, etc., can be found in the
GENERAL
INFORMATION
section of this manual.
For any specification or specific requirement on service or
preventative maintenance for the engine, refer to the
Engine
Manufacturer’s Manual
.
Compressed air can be dangerous if incorrectly handled. Before
doing any work on the unit, ensure that all pressure is vented from the
system and that the machine cannot be started accidentally.
If the automatic blowdown fails to operate, then pressure must be
gradually relieved by operating the manual blowdown valve. Suitable
personal protective equipment should be worn.
Ensure that maintenance personnel are adequately trained,
competent and have read the Maintenance Manuals.
Prior to attempting any maintenance work, ensure that:
−
. all air pressure is fully discharged and isolated from the system. If
the automatic blowdown valve is used for this purpose, then allow
enough time for it to complete the operation.
. the discharge pipe / manifold area is depressurised by opening the
discharge valve, whilst keeping clear of any airflow from it.
. the machine cannot be started accidentally or otherwise, by posting
warning signs and/or fitting appropriate anti
−
start devices.
. all residual electrical power sources (mains and battery) are
isolated.
Prior to opening or removing panels or covers to work
inside
a machine, ensure that:
−
. 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 accidentally 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, jewelry, 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
Comprises:
.
Low engine oil pressure switch
.
High discharge air temperature switch
.
High engine water temperature switch
Low engine oil pressure switch.
At three month intervals, test the engine oil pressure switch circuit
as follows:
.
Start the machine.
.
Remove a wire from one terminal of the switch. The machine should
shutdown.
At twelve month intervals, test the engine oil pressure switch as
follows:
.
Remove the switch from the machine.
.
Connect it to an independent low pressure supply (either air or oil).
.
The switch should operate at 1,0 bar (14.5 psi).
.
Refit the switch.
Temperature switch(es).
At three month intervals, test the temperature switch circuit(s) as
follows:
.
Start the machine.
NOTE:
Do not press the load button.
.
Disconnect each switch in turn. The machine should shutdown.
.
Re
−
connect the switch.
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 120
C (248
F). 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 115
C (239
F). Refit the switch.
CAUTION:
Never remove or replace switches when the machine
is running.
