Leading Particulars; Description Of Safety Pictograms Used In This Manual; General Description - Atlas Copco XAS 185 JD7 Instruction Book

12 When heavy parts are being lifted with a hoist, it is
strictly forbidden to dwell or pass under the load or in
the space which is liable to be hit if the load or part of it
should topple over or come loose. Never leave a load
hanging on a hoist. Lifting acceleration and retardation
shall be kept within safe limits.
13 A hoist has to be installed in such a way that the object
will be lifted perpendicular. If that is not possible, the
necessary precautions must be taken to prevent load-
swinging, e.g. by using two hoists, each at
approximately the same angle not exceeding 30deg
from the vertical.
14 When using compressed air or inert gas to clean down
equipment, do so with caution and use the appropriate
protection, at least safety glasses, for the operator as
well as for any bystander. Do not apply compressed
air or inert gas to your skin or direct an air or gas
stream at people. Never use it to clean dirt from your
clothes.
15 Before blowing compressed air or inert gas through a
hose, ensure that the open end is held securely, so
that it cannot whip and cause injury.
16 When washing parts in or with a cleaning solvent,
provide the required ventilation and use appropriate
protection such as a breathing filter, safety glasses,
rubber apron and gloves, etc.
17 Safety shoes should be compulsory in any workshop
and if there is a risk, however small, of failing objects,
wearing of a safety helmet should be included.
18 If there is a risk of inhaling hazardous gases, fumes or
dust, the respiratory organs must be protected and,
depending on the nature of the hazard, so must the
eyes and skin.
19. Remember that where there is visible dust, the finer,
invisible particles will almost certainly be present too;
but the fact that no dust can be seen is not a reliable
indication that dangerous, invisible dust is not present
in the air.
20. When using cartridge type breathing filter equipment,
ascertain that the correct type of cartridge is used and
that its useful service life is not surpassed.
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Leading Particulars

2.1 Description of Safety Pictograms
Used in this Manual
This symbol draws your attention to dangerous
situations. The operation concerned may
endanger persons and cause injuries.
+
This symbol is followed by supplementary
information.
1310 3011 73
Fig. 2.1 General view of XAS 185 JD7

2.2 General Description

The XAS 185 is a silenced, single-stage, oil-injected screw
compressor, built for a normal effective working pressure of 7
bar (102 psi).
— Engine
The compressor is driven by a water-cooled diesel engine. The
engine's power is transmitted to the compressor through a
flexible coupling.
— Compressor
The compressor casing houses two screw-type rotors, mounted
on ball and roller bearings. The male rotor, driven by the
engine, drives the female rotor. The male rotor has four lobes
and the female rotor has six flutes. Thus, the male rotor
revolves at 1 1/2 times the speed of the female rotor. The
element delivers pulsation-free air.
Injected oil is used for sealing, cooling and lubricating purposes.
— Compressor Oil System
The oil is boosted by air pressure. The system has no oil pump.
The oil is removed from the air, in the air/oil vessel first by
centrifugal force, second through the oil separator element. The
vessel is provided with an oil level indicator.
— Regulation
The compressor is provided with a continuous regulating system
and a blow-down valve which is integrated in the unloader
assembly. The valve is closed during operation by outlet
pressure of the compressor element and opens by air receiver
pressure when the compressor is stopped.
When the air consumption increases, the air receiver pressure
will decrease and vice versa.
This receiver pressure variation is sensed by the regulating
valve which, by means of control air to the unloader and engine
speed regulator, matches the air output to the air consumption.
The air receiver pressure is maintained between the pre-
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