Atlas Copco XAHS 186 Cud PNE User manual

Instruction Manual
for Portable Compressors
English
XAHS 186 Cud PNE Engine 6BT5.9

ATLAS COPCO (I) LTD. - PORTABLE ENERGY DIVISION
www.atlascopco.com
Printed matter N°
9096 3227 00
11/2018
Instruction Manual
for Portable Compressors
XAHS 186 Cud PNE
The information provided in this book is applicable for compressors with
Sr. No. PNA 814619 and onward.

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Warranty and Liability Limitation
Use only authorized parts.
Any damage or malfunction caused by the use of unauthorized parts is not covered by Warranty or Product
Liability.
The manufacturer does not accept any liability for any damage arising for modifications, additions or
conversions made without the manufacturer's approval in writing.
While every effort has been made to ensure that the information in this manual is correct, Atlas Copco does not
assume responsibility for possible errors.
Copyright, 2018 Atlas Copco (India) Ltd.
Any unauthorized use or copying of the contents or any part thereof is prohibited.
This applies in particular to trademarks, model denominations, part numbers and drawings.

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Preface
Please read the following instructions
carefully before starting to use your
compressor.
It is a solid, safe and reliable machine,
built according to the latest technology.
Follow the instructions in this booklet and
we guarantee you years of troublefree
operation.
Always keep the manual available near the
machine.
In all correspondence always mention the
compressor type and serial number, shown
on the data plate.
The company reserves the right to make
changes without prior notice.
Table of contents
1 Safety precautions ................................... 7
1.1 Introduction ............................................... 7
1.2 General safety precautions ........................ 8
1.3 Safety during transport and installation .... 9
1.4 Safety during use and operation.............. 10
1.5 Safety during maintenance and repair..... 13
1.6 Tool applications safety .......................... 14
1.7 Specific safety precautions...................... 15
2 Leading particulars ............................... 17
2.1 Description of safety pictograms used in this
manual ..................................................... 17
2.2 General description ................................. 17
3 Main parts.............................................. 19
3.1 Regulating system ................................... 21
3.1.1 Overview............................................. 21
3.1.2 Air flow............................................... 22
3.1.3 Oil system ........................................... 22
3.1.4 Continuous regulating system............. 23
3.2 Markings and information labels ............ 24
3.3 Electric system ........................................ 25
4 Operating instructions .......................... 28
4.1 Parking, towing and lifting instructions .. 28
4.1.1 Parking instructions ............................ 28
4.1.2 Towing instructions ............................ 29
4.1.3 Lifting instructions.............................. 29
4.2 Height adjustment (With adjustable
towbar) .................................................... 30
4.3 Before starting......................................... 31
4.4 Starting / Stopping .................................. 32
4.4.1 Control panel ...................................... 32
4.5 Operations overview ............................... 34
4.6 Specific start procedure........................... 34
5 Maintenance .......................................... 35
5.1 Liability................................................... 35
5.2 Service paks ............................................ 35
5.3 Service kits.............................................. 35
5.3.1 Storage ................................................ 35
5.3.2 Safety precautions............................... 35
5.4 Preventive maintenance schedule for the
compressor .............................................. 36
5.5 Oil specifications..................................... 39
5.6 Oil level check ........................................ 40
5.6.1 Check engine oil level ........................ 40
5.6.2 Check compressor oil level................. 40
5.7 Oil and oil filter change .......................... 40
5.7.1 Engine oil and oil filter change........... 40
5.7.2 Topping up the compressor oil ........... 41
5.7.3 Compressor oil and oil filter change... 41
5.8 Coolant specifications ............................. 42
5.9 Coolant check.......................................... 43
5.10 Topping upcoolant .................................. 43
5.11 Replacing the coolant.............................. 43
5.12 Cleaning coolers...................................... 44
5.13 Battery care ............................................. 45
5.13.1 Electrolyte........................................... 45
5.13.2 Activating a dry-charged battery ........ 45
5.13.3 Recharging a battery ........................... 45
5.13.4 Battery maintenance ........................... 46
5.14 Compressor element overhaul................. 46

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6 Engine preservation .............................. 47
6.1 Storage of engine less than or up to 6 months
from the date of engine shipment from
cummins plant ......................................... 47
6.2 Storage of engine more than 6 months from
the date of engine shipment from cummins
plant ......................................................... 47
6.3 Storage of the engine that is installed on the
equipment ................................................ 48
6.4 Prepare the stored engine for putting in
service...................................................... 48
7 Adjustments and servicing procedures 49
7.1 Adjustment of the continuous regulating
system ...................................................... 49
7.2 Air filters engine / compressor ................ 51
7.2.1 Main parts ........................................... 51
7.2.2 Cleaning the dust trap ......................... 51
7.2.3 Replacing the filter element and the
safety cartridge .................................... 51
7.3 Air receiver.............................................. 52
7.4 Safety valve ............................................. 52
7.5 Fuel system.............................................. 53
7.5.1 Priming instructions ............................ 53
7.5.2 Replacing fuel filter elements ............. 53
8 Problem solving ..................................... 54
9 Technical specifications ........................ 58
9.1 Torque values .......................................... 58
9.1.1 General torque values ......................... 58
9.2 Compressor / engine specifications......... 59
9.2.1 Reference conditions........................... 59
9.2.2 Limitations .......................................... 60
9.2.3 Performance data ................................ 61
9.2.4 Design data.......................................... 63
10 Dataplate ................................................ 64
11 Disposal .................................................. 65
11.1 General .................................................... 65
11.2 Disposal of materials............................... 65
12 Maintenance Log................................... 66

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Safety precautions
INTRODUCTION
The policy of Atlas Copco is to provide the
users of their equipment with safe, reliable
and efficient products. Factors taken into
account are among others:
- the intended and predictable future use
of the products, and the environments
in which they are expected to operate,
- applicable rules, codes and regulations,
- the expected useful product life,
assuming proper service and
maintenance,
- providing the manual with up-to-date
information.
Before handling any product, take time to
read the relevant instruction manual.
Besides giving detailed operating
instructions, it also gives specific
information about safety, preventive
maintenance, etc.
Keep the manual always at the unit
location, easy accessible to the operating
personnel.
See also the safety precautions of the
engine and possible other equipment,
which are separately sent along or are
mentioned on the equipment or parts of the
unit.
These safety precautions are general and
some statements will therefore not always
apply to a particular unit.
Only people that have the right skills
should be allowed to operate, adjust,
perform maintenance or repair on Atlas
Copco equipment.
It is the responsibility of management to
appoint operators with the appropriate
training and skill for each category of job.
Skill level 1: Operator
An operator is trained in all aspects of
operating the unit with the push-buttons,
and is trained to know the safety aspects.
Skill level 2: Mechanical technician
A mechanical technician is trained to
operate the unit the same as the operator. In
addition, the mechanical technician is also
trained to perform maintenance and repair,
as described in the instruction manual, and
is allowed to change settings of the control
and safety system. A mechanical
technician does not work on live electrical
components.
Skill level 3: Electrical technician
An electrical technician is trained and has
the same qualifications as both the operator
and the mechanical technician. In addition,
the electrical technician may carry out
electrical repairs within the various
enclosures of the unit. This includes work
on live electrical components.
Skill level 4: Specialist from the
manufacturer
This is a skilled specialist sent by the
manufacturer or its agent to perform
complex repairs or modifications to the
equipment.
In general it is recommended that not more
than two people operate the unit, more
operators could lead to unsafe operating
conditions.
Take necessary steps to keep unauthorized
persons away from the unit and eliminate
all possible sources of danger at the unit.
To be read attentively and acted accordingly before towing, lifting,
operating, performing maintenance or repairing the compressor.

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When handling, operating, overhauling
and/or performing maintenance or repair
on Atlas Copco equipment, the mechanics
are expected to use safe engineering
practices and to observe all relevant local
safety requirements and ordinances. The
following list is a reminder of special
safety directives and precautions mainly
applicable to Atlas Copco equipment.
These safety precautions apply to
machinery processing or consuming air.
Processing of any other gas requires
additional safety precautions typical to the
application and are not included herein.
Neglecting the safety precautions may
endanger people as well as environment
and machinery:
- endanger people due to electrical,
mechanical or chemical influences,
- endanger the environment due to
leakage of oil, solvents or other
substances,
- endanger the machinery due to function
failures.
All responsibility for any damage or injury
resulting from neglecting these
precautions or by non-observance of
ordinary caution and due care required in
handling, operating, maintenance or repair,
also if not expressly mentioned in this
instruction manual, is disclaimed by Atlas
Copco.
The manufacturer does not accept any
liability for any damage arising from the
use of non-original parts and for
modifications, additions or conversions
made without the manufacturer’s approval
in writing.
If any statement in this manual does not
comply with local legislation, the stricter
of the two shall be applied.
Statements in these safety precautions
should not be interpreted as suggestions,
recommendations or inducements that it
should be used in violation of any
applicable laws or regulations.
GENERAL SAFETY PRECAUTIONS
1 The owner is responsible for
maintaining the unit in a safe operating
condition. Unit parts and accessories
must be replaced if missing or
unsuitable for safe operation.
2 The supervisor, or the responsible
person, shall at all times make sure that
all instructions regarding machinery
and equipment operation and
maintenance are strictly followed and
that the machines with all accessories
and safety devices, as well as the
consuming devices, are in good repair,
free of abnormal wear or abuse, and are
not tampered with.
3 Whenever there is an indication or any
suspicion that an internal part of a
machine is overheated, the machine
shall be stopped but no inspection
covers shall be opened before sufficient
cooling time has elapsed; this to avoid
the risk of spontaneous ignition of oil
vapour when air is admitted.
4 Normal ratings (pressures,
temperatures, speeds, etc.) shall be
durably marked.
5 Operate the unit only for the intended
purpose and within its rated limits
(pressure, temperature, speeds, etc.).

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6 The machinery and equipment shall be
kept clean, i.e. as free as possible from
oil, dust or other deposits.
7 To prevent an increase in working
temperature, inspect and clean heat
transfer surfaces (cooler fins,
intercoolers, water jackets, etc.)
regularly. See the Preventive
maintenance schedule for the
compressor.
8 All regulating and safety devices shall
be maintained with due care to ensure
that they function properly. They may
not be put out of action.
9 Care shall be taken to avoid damage to
safety valves and other pressure-relief
devices, especially to avoid plugging
by paint, oil coke or dirt accumulation,
which could interfere with the
functioning of the device.
10 Pressure and temperature gauges shall
be checked regularly with regard to
their accuracy. They shall be replaced
whenever outside acceptable
tolerances.
11 Safety devices shall be tested as
described in the maintenance schedule
of the instruction manual to determine
that they are in good operating
condition. See the Preventive
maintenance schedule for the
compressor.
12 Mind the markings and information
labels on the unit.
13 In the event the safety labels are
damaged or destroyed, they must be
replaced to ensure operator safety.
14 Keep the work area neet. Lack of order
will increase the risk of accidents.
15 When working on the unit, wear safety
clothing. Depending on the kind of
activities these are: safety glasses, ear
protection, safety helmet (including
visor), safety gloves, protective
clothing, safety shoes. Do not wear the
hair long and loose (protect long hair
with a hairnet), or wear loose clothing
or jewelry.
16 Take precautions against fire. Handle
fuel, oil and anti-freeze with care
because they are inflammable
substances. Do not smoke or approach
with naked flame when handling such
substances. Keep a fire-extinguisher in
the vicinity.
SAFETY DURING TRANSPORT
AND INSTALLATION
Transport of the unit has to be done by
authorized/experienced people.
When towing, lifting or transporting the
compressor in any way, the battery switch
must always be in the “OFF” position!
To lift a unit, all loose or pivoting parts,
e.g. doors and tow bar, shall first be
securely fastened.
Do not attach cables, chains or ropes
directly to the lifting eye; apply a crane
hook or lifting shackle meeting local safety
regulations. Never allow sharp bends in
lifting cables, chains or ropes.
Helicopter lifting is not allowed.
It is strictly forbidden to dwell or stay in
the risk zone under a lifted load. Never lift
the unit over people or residential areas.
Lifting acceleration and retardation shall
be kept within safe limits.
1 Before towing the unit:
- ascertain that the pressure vessel(s) is
(are) depressurized,
- check the tow bar, the brake system
and the towing eye. Also check the
coupling of the towing vehicle,
- check the towing and brake
capability of the towing vehicle,

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- check that the tow bar, jockey wheel
or stand leg is safely locked in the
raised position,
- ascertain that the towing eye can
swivel freely on the hook,
- check that the wheels are secure and
that the tyres are in good condition
and inflated correctly,
- connect the signalisation cable,
check all lights and connect the
pneumatic brake couplers,
- attach the safety break-away cable or
safety chain to the towing vehicle,
- remove wheel chocks, if applied, and
disengage the parking brake,
- check wether springs on
wheelchocks are missing or broken.
2 To tow a unit use a towing vehicle of
ample capacity. Refer to the
documentation of the towing vehicle.
3 If the unit is to be backed up by the
towing vehicle, disengage the overrun
brake mechanism (if it is not an
automatic mechanism).
4 Never exceed the maximum towing
speed of the unit (mind the local
regulations).
5 Place the unit on level ground and apply
the parking brake before disconnecting
the unit from the towing vehicle. Unclip
the safety break-away cable or safety
chain. If the unit has no parking brake
or jockey wheel, immobilize the unit by
placing chocks in front of and/or behind
the wheels. When the tow bar can be
positioned vertically, the locking
device must be applied and kept in good
order. The unit must always be used/
parked/stored in a non publicly
accessible area, locked away from
access by unauthorized persons.
6 To lift heavy parts, a hoist of ample
capacity, tested and approved
according to local safety regulations,
shall be used.
7 Lifting hooks, eyes, shackles, etc., shall
never be bent and shall only have stress
in line with their design load axis. The
capacity of a lifting device diminishes
when the lifting force is applied at an
angle to its load axis.
8 For maximum safety and efficiency of
the lifting apparatus all lifting members
shall be applied as near to perpendicular
as possible. If required, a lifting beam
shall be applied between hoist and load.
9 Never leave a load hanging on a hoist.
10 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 30° from the
vertical.
11 Locate the unit away from walls. Take
all precautions to ensure that hot air
exhausted from the engine and driven
machine cooling systems cannot be
recirculated. If such hot air is taken in
by the engine or driven machine
cooling fan, this may cause overheating
of the unit; if taken in for combustion,
the engine power will be reduced.
12 Before moving the compressor, switch
it off.
13 If the warning light on the ABS module
or in the vehicle lights up, please
contact Atlas Copco.
SAFETY DURING USE AND
OPERATION
1 When the unit has to operate in a fire-
hazardous environment, each engine
exhaust has to be provided with a spark
arrestor to trap incendiary sparks.
2 The exhaust contains carbon monoxide
which is a lethal gas. When the unit is
used in a confined space, conduct the
engine exhaust to the outside
atmosphere by a pipe of sufficient
diameter; do this in such a way that no
extra back pressure is created for the
engine. If necessary, install an
extractor. Observe any existing local

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regulations. Make sure that the unit has
sufficient air intake for operation. If
necessary, install extra air intake ducts.
3 When operating in a dust-laden
atmosphere, place the unit so that dust
is not carried towards it by the wind.
Operation in clean surroundings
considerably extends the intervals for
cleaning the air intake filters and the
cores of the coolers.
4 Close the compressor air outlet valve
before connecting or disconnecting a
hose. Ascertain that a hose is fully
depressurized before disconnecting it.
Before blowing compressed air through
a hose or air line, ensure that the open
end is held securely, so that it cannot
whip and cause injury.
5 The air line end connected to the outlet
valve must be safeguarded with a safety
cable, attached next to the valve.
6 No external force may be exerted on the
air outlet valves, e.g. by pulling on
hoses or by installing auxiliary
equipment directly to a valve, e.g. a
water separator, a lubricator, etc. Do
not step on the air outlet valves.
7 Never move a unit when external lines
or hoses are connected to the outlet
valves, to avoid damage to valves,
manifold and hoses.
8 Do not use compressed air from any
type of compressor, without taking
extra measures, for breathing purposes
as this may result in injury or death. For
breathing air quality, the compressed
air must be adequately purified
according to local legislation and
standards. Breathing air must always be
supplied at stable, suitable pressure.
9 Distribution pipework and air hoses
must be of correct diameter and suitable
for the working pressure. Never use
frayed, damaged or deteriorated hoses.
Replace hoses and flexibles before the
lifetime expires. Use only the correct
type and size of hose end fittings and
connections.
10 If the compressor is to be used for sand-
blasting or will be connected to a
common compressed-air system, fit an
appropriate non-return valve (check
valve) between compressor outlet and
the connected sand-blasting or
compressed-air system. Observe the
right mounting position/direction.
11 Before removing the oil filler plug,
ensure that the pressure is released by
opening an air outlet valve.
12 Never remove a filler cap of the cooling
water system of a hot engine. Wait until
the engine has sufficiently cooled
down.
13 Never refill fuel while the unit is
running, unless otherwise stated in the
Atlas Copco Instruction Book (AIB).
Keep fuel away from hot parts such as
air outlet pipes or the engine exhaust.
Do not smoke when fuelling. When
fuelling from an automatic pump, an
earthing cable should be connected to
the unit to discharge static electricity.
Never spill nor leave oil, fuel, coolant
or cleansing agent in or around the unit.
14 All doors shall be shut during operation
so as not to disturb the cooling air flow
inside the bodywork and/or render the
silencing less effective. A door should
be kept open for a short period only e.g.
for inspection or adjustment.
15 Periodically carry out maintenance
works according to the maintenance
schedule.
16 Stationary housing guards are provided
on all rotating or reciprocating parts not
otherwise protected and which may be
hazardous to personnel. Machinery
shall never be put into operation, when
such guards have been removed, before
the guards are securely reinstalled.

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17 Noise, even at reasonable levels, can
cause irritation and disturbance which,
over a long period of time, may cause
severe injuries to the nervous system of
human beings. When the sound
pressure level, at any point where
personnel normally has to attend, is:
- below 70 dB(A): no action needs to
be taken,
- above 70 dB(A): noise-protective
devices should be provided for
people continuously being present in
the room,
- below 85 dB(A): no action needs to
be taken for occasional visitors
staying a limited time only,
- above 85 dB(A): room to be
classified as a noise-hazardous area
and an obvious warning shall be
placed permanently at each entrance
to alert people entering the room, for
even relatively short times, about the
need to wear ear protectors,
- above 95 dB(A): the warning(s) at
the entrance(s) shall be completed
with the recommendation that also
occasional visitors shall wear ear
protectors,
- above 105 dB(A): special ear
protectors that are adequate for this
noise level and the spectral
composition of the noise shall be
provided and a special warning to
that effect shall be placed at each
entrance.
18 The unit has parts, which may be
accidentally touched by personnel, of
which the temperature can be in exess
of 80 °C (176 °F). The insulation or
safety guard, protecting these parts
shall not be removed before the parts
have cooled down to room temperature.
19 Never operate the unit in surroundings
where there is a possibility of taking in
flammable or toxic fumes.
20 If the working process produces fumes,
dust or vibration hazards, etc., take the
necessary steps to eliminate the risk of
personnel injury.
21 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.
22 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.
23 Safety shoes should be compulsory in
any workshop and if there is a risk,
however small, of falling objects,
wearing of a safety helmet should be
included.
24 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.
25 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.
26 Never operate the unit at pressures or
speeds below or in excess of its limits as
indicated in the technical
specifications.

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SAFETY DURING MAINTENANCE
AND REPAIR
Maintenance, overhaul and repair work
shall only be carried out by adequately
trained personnel; if required, under
supervision of someone qualified for the
job.
1 Use only the correct tools for
maintenance and repair work, and only
tools which are in good condition.
2 Parts shall only be replaced by genuine
Atlas Copco replacement parts.
3 All maintenance work, other than
routine attention, shall only be
undertaken when the unit is stopped.
Steps shall be taken to prevent
inadvertent starting. In addition, a
warning sign bearing a legend such as
”work in progress; do not start” shall be
attached to the starting equipment. On
engine-driven units the battery shall be
disconnected and removed or the
terminals covered by insulating caps.
On electrically driven units the main
switch shall be locked in open position
and the fuses shall be taken out. A
warning sign bearing a legend such as
”work in progress; do not supply
voltage” shall be attached to the fuse
box or main switch.
4 Before dismantling any pressurized
component, the compressor or
equipment shall be effectively isolated
from all sources of pressure and the
entire system shall be relieved of
pressure. Do not rely on non-return
valves (check valves) to isolate
pressure systems. In addition, a
warning sign bearing a legend such as
”work in progress; do not open” shall
be attached to each of the outlet valves.
5 Prior to stripping an engine or other
machine or undertaking major overhaul
on it, prevent all movable parts from
rolling over or moving.
6 Make sure that no tools, loose parts or
rags are left in or on the machine. Never
leave rags or loose clothing near the
engine air intake.
7 Never use flammable solvents for
cleaning (fire-risk).
8 Take safety precautions against toxic
vapours of cleaning liquids.
9 Never use machine parts as a climbing
aid.
10 Observe scrupulous cleanliness during
maintenance and repair. Keep away
dirt, cover the parts and exposed
openings with a clean cloth, paper or
tape.
11 Never weld on or perform any
operation involving heat near the fuel or
oil systems. Fuel and oil tanks must be
completely purged, e.g. by steam-
cleaning, before carrying out such
operations. Never weld on, or in any
way modify, pressure vessels.
Disconnect the alternator cables during
arc welding on the unit.
12 Support the tow bar and the axle(s)
securely if working underneath the unit
or when removing a wheel. Do not rely
on jacks.
13 Do not remove any of, or tamper with,
the sound-damping material. Keep the
material free of dirt and liquids such as
fuel, oil and cleansing agents. If any
sound-damping material is damaged,
replace it to prevent the sound pressure
level from increasing.
14 Use only lubricating oils and greases
recommended or approved by Atlas
Copco or the machine manufacturer.
Ascertain that the selected lubricants
comply with all applicable safety
regulations, especially with regard to
explosion or fire-risk and the possibility
of decomposition or generation of
hazardous gases. Never mix synthetic
with mineral oil.

- 14 -
15 Protect the engine, alternator, air intake
filter, electrical and regulating
components, etc., to prevent moisture
ingress, e.g. when steam-cleaning.
16 When performing any operation
involving heat, flames or sparks on a
machine, the surrounding components
shall first be screened with non-
flammable material.
17 Never use a light source with open
flame for inspecting the interior of a
machine.
18 Disconnect –battery-clamp before
starting electrical servicing or welding
(evt. turn battery-switch in “off”
position).
19 When repair has been completed, the
machine shall be barred over at least
one revolution for reciprocating
machines, several revolutions for rotary
ones to ensure that there is no
mechanical interference within the
machine or driver. Check the direction
of rotation of electric motors when
starting up the machine initially and
after any alteration to the electrical
connection(s) or switch gear, to check
that the oil pump and the fan function
properly.
20 Maintenance and repair work should be
recorded in an operator’s logbook for
all machinery. Frequency and nature of
repairs can reveal unsafe conditions.
21 When hot parts have to be handled, e.g.
shrink fitting, special heat-resistant
gloves shall be used and, if required,
other body protection shall be applied.
22 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.
23 Make sure that oil, solvents and other
substances likely to pollute the
environment are properly disposed of.
24 Before clearing the unit for use after
maintenance or overhaul, check that
operating pressures, temperatures and
speeds are correct and that the control
and shutdown devices function
correctly.
TOOL APPLICATIONS SAFETY
Apply the proper tool for each job. With
the knowledge of correct tool use and
knowing the limitations of tools, along
with some common sense, many accidents
can be prevented.
Special service tools are available for
specific jobs and should be used when
recommended. The use of these tools will
save time and prevent damage to parts.

- 15 -
SPECIFIC SAFETY PRECAUTIONS
Batteries
When servicing batteries, always wear
protecting clothing and glasses.
1 The electrolyte in batteries is a
sulphuric acid solution which is fatal if
it hits your eyes, and which can cause
burns if it contacts your skin. Therefore,
be careful when handling batteries, e.g.
when checking the charge condition.
2 Install a sign prohibiting fire, open
flame and smoking at the post where
batteries are being charged.
3 When batteries are being charged, an
explosive gas mixture forms in the cells
and might escape through the vent holes
in the plugs. Thus an explosive
atmosphere may form around the
battery if ventilation is poor, and can
remain in and around the battery for
several hours after it has been charged.
Therefore:
- never smoke near batteries being, or
having recently been, charged,
- never break live circuits at battery
terminals, because a spark usually
occurs.
4 When connecting an auxiliary battery
(AB) in parallel to the unit battery (CB)
with booster cables: connect the + pole
of AB to the + pole of CB, then connect
the - pole of CB to the mass of the unit.
Disconnect in the reverse order.
Pressure vessels
Maintenance/installation requirements:
1 The vessel can be used as pressure
vessel or as separator and is designed to
hold compressed air for the following
application:
- pressure vessel for compressor,
- medium AIR/OIL,
- and operates as detailed on the data
plate of the vessel:
- the maximum working pressure ps in
bar (psi),
- the maximum working temperature
Tmax in °C (°F),
- the minimum working temperature
Tmin in °C (°F),
- the capacity of the vessel V in l (US
gal, Imp gal, cu.ft).
2 The pressure vessel is only to be used
for the applications as specified above
and in accordance with the technical
specifications. Safety reasons prohibit
any other applications.
3 National legislation requirements with
respect to re-inspection must be
complied with.
4 No welding or heat treatment of any
kind is permitted to those vessel walls
which are exposed to pressure.
5 The vessel is provided and may only be
used with the required safety equipment
such as manometer, overpressure
control devices, safety valve, etc.
6 Draining of condensate shall be
performed daily when vessel is in use.
7 Installation, design and connections
should not be changed.
8 Bolts of cover and flanges may not be
used for extra fixation.
9 (Pressure) vessel maintenance is to be
performed by Atlas Copco.

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Safety valves
Operating & Maintenance
Only trained and technically competent
personnel should consider overhaul, re-set
or performance testing of safety valves.
The safety valve is supplied with either a
lead security seal or crimped cover to deter
unauthorised access to the pressure
regulation device.
Under no circumstances should the set
pressure of the safety valve be altered to a
different pressure than that stamped on the
valve without the permission of the
installation designer.
If the set pressure must be altered then use
only correct parts supplied by Seetru and in
accordance with the instructions available
for the valve type.
Safety valves must be frequently tested and
regularly maintained.
The set pressure should be periodically
checked for accuracy.
When fitted, the lifting device should be
operated at pressures not less than 75% of
the set pressure to ensure free and easy
movement of internal parts.
The frequency of tests is influenced by
factors such as the severity of the operating
environment and aggressiveness of the
pressurised medium.
Soft seals and springs should be replaced
as part of the maintenance procedure.
Do not paint or coat the installed safety
valve (see also Preventive maintenance
schedule for the compressor).

- 17 -
Leading particulars
DESCRIPTION OF SAFETY
PICTOGRAMS USED IN THIS
MANUAL
GENERAL DESCRIPTION
The compressor XAHS 186 Cud is
silenced, single-stage, oil-injected screw
compressor, built for a nominal effective
working pressure of 12 bar (175 psi).
Engine
The compressor is driven by a liquid-
cooled diesel engine.
The engine’s power is transmitted to the
compressor element through a heavy-duty
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
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 at first by centrifugal force,
secondly through the oil separator element.
The vessel is provided with an oil level
indicator.
Regulation
The compressor is provided with a single
or dual pressure continuous regulating
system and a blow-off valve which is
integrated in the unloader assembly. The
valve is closed during operation by air
receiver pressure and opens by air receiver
pressure via the compressor element when
the compressor is stopped.
When the air consumption increases, the
air receiver pressure will decrease and vice
versa.
This symbol draws your
attention to dangerous
situations. The operation
concerned may endanger
persons and cause injuries.
This symbol is followed by
supplementary information.

- 18 -
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-
selected working pressure and the
corresponding unloading pressure.
Cooling system
The engine is provided with a liquid-cooler
and the compressor is provided with an oil
cooler.
The cooling air is generated by a fan,
driven by the engine.
Safety devices
A thermal shut-down sensor protects the
compressor against overheating. The air
receiver is provided with a safety valve.
The engine is equipped with low oil
pressure and high coolant temperature
shut-down sensors.
The electric system is equipped with a 12V
main switch.
Frame and axles
The compressor/engine unit is supported
by rubber buffers in the frame.
The standard compressor unit has a
adjustable towbar with brakes.
Bodywork
The bodywork has openings for the intake
and outlet of cooling air and hinged doors
for maintenance and service operations.
The bodywork is internally lined with
sound-absorbing material.
Lifting beam
A lifting beam is accessible when a small
door at the top is opened.
Serial number
The serial number is mentioned on the data
plate.
Control panel
The control panel grouping the air pressure
gauge, control switch etc., is placed at the
left hand/ rear end corner.
Data plate
The compressor is furnished with a data
plate showing the product code, the unit
serial number and the working pressure
(see chapter Dataplate).

- 19 -
Main parts

- 20 -
Reference Name
A Alternator
AFce Air Filter (compressor
element)
AFe Air Filter (engine)
AOV Air Outlet Valves
AR Air Receiver
BBattery
BH Brake Handle
CE Compressor Element
CP Control Panel
CT Coolant Tank
DP Data Plate
DPoc Drain Plug Oil Cooler
DPr Drain Plug Radiator
DSE Dipstick Engine Oil
E Engine
EP Exhaust Pipe
FFan
FCc Filler Cap (coolant)
FCe Filler Cap (engine oil)
FCt Filler Cap (fuel tank)
FF Fuel Filter
FPco Filler Plug (compressor oil)
FT Fuel Tank
MPV Minimum Pressure Valve
OC Oil Cooler
OFce Oil Filter (compressor
element)
OFe Oil Filter (engine)
OLG Oil Level Gauge
RRadiator
RB Recovery Bottle
RV Regulating Valve
S Starting Motor
SL Support Leg
SR Speed Regulator
ST Strainer
SV Safety Valve
TB Towbar
UV Unloading Valve
VIce Vacuum Indicator (compr.
element)
VIe Vacuum Indicator (engine)
VV Vacuator Valve
FWS Fuel Water Seperator
Reference Name