System of units .................................................................. 12
DCD90-180
Technical Handbook
Safety regulations
It is important that you read the instruction manual
Incorrect handling can lead to personal injury or damage to products and/or property. Therefore, read the instruction book very
carefully before operating the truck. The instruction manual contains important information about your Kalmar truck, about the
operation of the truck, about safety during operation and about
the truck’s daily maintenance. In addition, you will find useful information that will make operations easier for you in your daily
work.
Ask your foreman/group leader if there is anything in the manual
that you do not understand or if you feel that information is missing in any area.
The symbol is used on our products in certain cases and
then refers to important information contained in the instruction
manual. Make sure that warning and information symbols are always clearly visible and legible. Replace symbols that have been
damaged or painted over.
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2
Safety regulations
In this handbook warnings are inserted that apply to your own
safety. Warnings point out the risk of accident that can cause personal injury.
WARNING!
Warns of the risk of serious personal injury, possible
death and/or serious damage to product or property if the
regulations are not followed.
For technical warnings, that point out the risk of break down, the
word IMPORTANT is used:
IMPORTANT!
Is used to draw attention to such occurrences that can
cause damage to the product or property.
For information that facilitates the working process or handling,
N.B. is used:
N.B. Draws attention to useful information that helps the
working process.
DCD90-180
Technical Handbook
Safety regulations
Safety regulations aimed at reducing the risk of personal
injury and damage to loads or other property.
9350
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P.Group 00
3
Intended of use
zThe truck may only be used for the purpose for
which it was intended, namely, to lift and transport
goods, the weight of which does not exceed the
maximum permitted load capacity of the truck.
zThe truck may not, without specific permission
from Kalmar, be modified or re-built so that its
function or performance is altered.
zThe truck may not be driven on public highways if
it has not been adapted to comply with national
road safety regulations.
Operator requirements
zThe truck may only be driven by operators who
have been specially trained and who have the
company’s authority to do so.
zLaws and other regulations relating to driving li-
cence, operator ID, log book, etc., must be followed at all times.
zThe operator must be aware of and follow all local
safety regulations.
Operation of the truck is prohibited:
zIf any of the fitted safety equipment, such as rear
view mirrors, headlights, reversing alarm (optional) does not function correctly.
zIf there is a fault with the brakes, steering or lift
equipment.
zIf the truck is fitted with tyres not approved by
Kalmar.
Operating regulations
zBefore starting, always check to ensure that no-
body is in the way of the truck or its equipment.
zMake sure that nobody walks or stands under-
neath raised forks or other equipment, whether
they are loaded or not.
zThe operator must always face the direction of op-
eration and take particular care in areas where
persons or other vehicles are likely to appear in
the vicinity. If visibility is limited by the load, the operator should operate the truck in reverse.
zIt is prohibited to transport passengers on the
truck outside the cab or on the load. Passengers
may be transported inside the cab only on condition that it is equipped with a fixed passenger
seat.
zIt is prohibited to lift people if the truck is not
equipped with an approved lift cage.
zIt is prohibited to exceed the load capacity of the
truck. See capacity plate and loading diagram.
zIt is prohibited to transport loads in the raised po-
sition as this entails a risk of the truck tipping. All
transportation shall take place with the load in the
lowered position and with the mast tilted backwards to the maximum.
zThe operator must adapt the speed of the truck to
the character of the load, conditions of visibility,
the character of the roadway/surface, etc.
zThe operator shall avoid powerful acceleration
and braking when turning. In addition, the operator shall always moderate the speed of the truck
when turning so as to avoid the risk of lateral skidding or tipping.
zThe operator shall take particular care when oper-
ating in the vicinity of electrical power lines, viaducts, quay-sides, ramps, gates/doors etc.
zSafety belts must always be worn, if fitted. In the
event of the truck tipping, always remain in the
cab and grip the steering wheel securely. Never
try to jump out of the cab.
zThe parking brake can also be used as an EMER-
GENCY BRAKE. However, having been used for
emergency braking, the brake linings must be inspected and replaced if needed. If the parking
brake has been mechanically released, it must always be reset in order for the truck to regain
the parking brake function.
Interrupted operation, parking
zAlways check that the gear lever is in the neutral
position before turning the ignition key to restart or
to reset an emergency stop.
zNever leave the operator’s cab without applying
the parking brake (ON position).
zAlways remove the ignition key if the truck is to be
left unattended.
Other important points to remember
zThe truck’s hydraulic system includes high pres-
sure hydraulic accumulators. Always be extremely careful when working with the hydraulic system
and avoid being unnecessarily close to the hydraulic equipment, lines and hoses. Before working on the hydraulic system, the accumulators
must be emptied into the tank, with the help of the
special accumulator evacuation valve.
zHandle batteries and junction boxes with great
care. The batteries must always be protected over
the poles and connections.
zAlways rectify any damage or wear and tear that
can risk personal safety or that can affect the
functions of the truck or its service life.
zTrucks with tippable cabs: The cab must always
be tipped over the point of balance. If there is insufficient lateral space the cab must always be secured against accidental lowering with a brace or
similar.
zAvoid touching oils and greases. Avoid inhaling
exhaust and oil fumes.
zWelding painted steel produces poisonous gas-
ses. Paint should therefore be stripped before
welding, good ventilation ensured and/or face
mask with filter used.
Operating with attachments
zThe operator must always take the effect of the wind
into account when handling containers. Avoid lifting
with a wind strength in excess of 12 m/s (27 mph/40
feet per second).
zAlways drive carefully so as to avoid attachments
colliding with pillars, cables, etc.
zCarefully study the "Lift methods" section of the
instruction manual.
DCD90-180
Technical Handbook
Safety regulations
Safety instructions for working with tyres
9350
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P.Group 00
4
zTyre changing can be dangerous and should only
be carried out by specially trained personnel using
proper tools and procedures.
Failure to comply with these procedures may result in faulty positioning of the tyre and/or rim and
cause the assembly to burst with explosive force
sufficient to cause physical injury or death. Never
fit or use damaged tyres or rims.
zNever attempt to weld on an inflated tyre/rim
assembly.
zNever let anyone assemble or disassemble tyres
without proper training.
zNever run the truck on one tyre of a dual assembly.
The load capacuty of a single tyre is then dangerous-ly exceeded and operation in this manner may
damage the rim.
zDeflation and dismantling
– Always block the tyre and wheel on the opposite
side of the vehicle before you place the jack in
position. Always crib up the blocks to prevent
the jack from slipping.
– Always check the tyre/rim assembly for proper
component seating prior to removal from the
truck.
– Always deflate the tyre by removing the valve
core prior to removing the complete assembly
from the truck or dismantling any of the component. Before loosening mounting bolts, run a
wire through the valve stem to ensure that it is
not blocked. Ice or dirt can prevent all the air
from escaping. Deflate and remove valve cores
from both tyres of a dual assembly.
– Never position body in front of the rim during de-
flation.
– Always follow assembly and dismantling proce-
dures outlined in the manufacturer’s instruction
manual, or other reconized industry instruction
manuals. Use proper rubber lubricant.
– Never use a steel hammer to assembling or dis-
mantling rim components – use a lead, brass or
plastic type mallets. The correct tools are available through rim/wheel distributors.
– remove bead seat band slowly to prevent acci-
dents. support the band with your thigh and roll
it slowly to the ground in order to protect back
and toes.
– Disassembly tools apply pressure to rim flanges
to unseat tyre beads. Keep your fingers clear.
Slant disassembly tool about 10 degrees to
keep it firmly in place. Always stand to one side
when applyin g hydraulic pressure. Should the
tool slip off, it may cause fatal injury .
zRim inspection
– Check rim components periodically for fatigue
cracks. Replace all cracked, badly worn,
damaged and severely rusted components.
– Always select the correct tyre size and construc-
tion matching the manufacturer’s rim or wheel
rating and size.
– Do not use over-size tyres, too large for the
rims, e.g. 14.5 inch tyres with 14 inch rims or
16.5 inch tyres with 16 inch rims.
– Never use damaged, worn or corroded rims/
wheels or fitting hardware. Always verify that the
rim is in a serviceable conditioning.
– Always clean and repaint lightly rusted rims.
– Never use a rim/wheel component that can not
be identified. Check rim parts against multipiece rim/wheel matching charts.
zAssembly and inflation
– It is important that the inflation equipment is
equipped with a water separator to remove
moist-ure from the air line in order to prevent coorosion. Check the separator periodically to ensure that it is working properly.
– Make sure that the lockring is in its right posi-
tion.
– Never mix different manufacurer’s parts since
this is potentially dangerous. Always check
manufacturer for approval.
– Never seat rings with hammering while the tyre
is inflated. Do not hammer on an inflated or partially inflated tyre/rim assembly.
– Always double check to ensure that the rim as-
semblies have been correctly assembled and
that securing studs and nuts are tightened to the
correct torque setting.
– Never inflate tyres before all side and lockrings
are in place. Check components for proper
assembly after pumping to approximately 5 psi
(=34 kPa, =0.34 bar)
– When adding air to a tyre on an industrial truck,
use a clip-on chuck and stay out of the danger
area. If the tyres has been run flat then the rim
must be dismantled and all parts inspected for
damage.
– Under-inflated tyres have a serious effect on the
stability of the truck and reduces the safe load
handling capacity. Always maintain tyres at the
correct inflation pressures. Check inflation
pressure daily. Do not over-inflate.
– Inspect tyres regulary – every day if possible.
Look for and remove broken glass, torn pieces
of tread, embedded metal chips etc. Inspect for
uneven or rapid tread wear, usually caused by
mechanical irregularities, such as brakes out of
adjustment or excessive toe-in and toe-out. If
discovered, correct the irregularity immediately.
zWhen installing and tightening trail wheel bolts, ob-
serve the following:
– Ensure that trail wheel or hub mounting surfac-
es and trail wheel fastener mounting surfaces
are clean and free from paint and grease.
– Tighten bolts to specified torque settings. use
staggered sequence; i.e. top bolt, bottom bolt
etc.
DCD90-180
Technical Handbook
General
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P.Group 00
5
Applications
The Kalmar DCD90-180 range of trucks is based on an entirely
new approach to the design and production of medium-heavy,
diesel-powered forklift trucks. The trucks are durable and safe
and their accessibility for service and maintenance is unexcelled.
Due the their versatility, the trucks can be used in a number of applications, such as:
zSteelworks and heavy engineering industry, where the
trucks handle individual tasks in the handling of mediumheavy goods.
zThe forest industry for handling logs by means of a log grap-
ple attachment, sorting of logs at sawmills and handling of
sawn timber in units loads.
zPorts and container terminals for handling medium-heavy
goods and handling empty containers.
zFactories producing houses – lifting of house sections.
KL734
DCD90-180
DCD90-180
Technical Handbook
General
9350
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P.Group 00
6
Design – general survey
Kalmar DCD90-180 diesel trucks are of sturdy design for heavy
duty. They are built around a chassis which has high strength and
torsional stiffness and an extremely low centre of gravity.
The operator’s cab is provided with vibration isolation and sound
insulation and offers excellent all-round visibility.
The operator is provided with many facilities for adjusting his
seating attitude. The seat, backrest and springing of the operator’s seat can be adjusted in a wide variety of ways.
The cab is tiltable and offers excellent accessibility to the transmission and pumps. The engine is easily accessible through a
casing, divided in two halves.
The Volvo or Perkins six-cylinder turbocharged engine TD640VE
or TD730VE/TWD731VE, combined with a three-speed gearbox
with torque converter, provides smooth power whenever needed.
The drive axle with hub reductions, the oil-cooled hydraulic brake
system and the pendulum-mounted steered axle with double-acting steering cylinder satisfy very strict demands on strength and
mobility when travelling on irregular surfaces.
The hydraulic system is reliable and has high performance
charged by two or three hydraulic pumps.
For further details, see group 70.
Component units
zSound-insulated and safety-tested operator’s cab with ex-
cellent all-round visibility. The non-slip, substantial steps provide convenient access to the cab. All models in the series
can be equipped with a rotatable operator’s seat.
In addition to the Instruction Manual and the Technical Handbook, the following books are delivered with every truck.
Spare parts catalogue
Instruction Manual for Volvo Industrial engines
Workshop Manual for Industrial engines
Workshop Manual for the Perkins engine
Replacement system - Spare parts
Kalmar operates a system of replacement parts, repair kits and
gasket sets covering most of the vital components of the truck.
For the contents of these kits, see the Spare parts catalogue.
Tools
Kalmar offers a wide range of tools for truck maintenance work.
For further information, please contact Kalmar’s service depart-
ment.
DCD90-180
Technical Handbook
General
9350
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P.Group 00
10
Tightening torques
The tightening torques are applicable to steel bolts and nuts tightened with a torque wrench under the following conditions:
Surface treatment
ConditionLubriation
BoltNut
1untreateduntreatedoiled
bright galvanised
2
3hot-dip galvanised bright galvaniseddry or oiled
The values specified in Table 1 are applicable to nut-and-bolt
joints, but can also be used for bolts fitted into tapped holes. However, in the latter case, the preloading force will be somewhat
lower, depending on its depth of engagement.
When tightening by machine, the torque specified in Table 1
should be reduced by approx. 5%, due to the increased scatter
and to prevent the bolt from being tightened beyond its yield
point.
Quality8,810,912,9
Thread
M fin
M8×1
M10×1,25
M12×1,25
M16×1,5
M18×1,5
bright galvanised
bright galvanised
Tightening torque, Nm
12311
27
54
96
230
330
24
48
85
205
294
untreated
bright galvanised
bright galvanised
Condition
30
61
108
260
373
135
323
466
dry or oiled
39
76
46
91
162
388
559
M20×1,5
M24×2
M30×2
M36×3
460
786
2660
1560
409
700
1388
2367
520
888
1763
3005
647
1100
2200
3730
777
1330
2640
4480
DCD90-180
Technical Handbook
General
To reduce the risk of settlement of the material and the
associated reduction in the preloading force if the hardness of the
surface supporting the bolt head or nut is lower than 200 HB, a
washer should be fitted under the bolt head and nut. This is not
applicable if flanged bolts or flanged nuts are used.
When tightening is carried out, the specified torque should be applied without pause, to ensure that the torque wrench will not be
tripped by the static friction before the joint has been tightened to
the specified torque.
Quality8,810,912,9
Tightening torque, Nm
Condition
Thread
M
12311
9350
00-11
P.Group 00
11
4
5
6
8
10
12
16
20
24
30
Quality8,810,912,9
Thread
UNC
1/4
5/16
3/8
7/16
1/2
3,2
6,4
11
26
52
91
220
430
750
1480
12311
12,5
25
44
70
107
2,9
5,7
9,8
24
47
81
198
386
668
1317
Tightening torque, Nm
11,1
22,3
39
62
95
3,6
7,2
12,5
30
59
103
250
49
848
1672
Condition
14,1
28,3
50
79
121
4,6
9,1
16
38
74
128
313
620
1050
2080
17,6
35
62
100
151
5,5
11
19
45
89
154
375
732
1270
2500
20
42
73
118
178
9/16
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2
153
210
370
594
889
1260
1760
2320
3060
136
187
390
528
791
1120
1565
2065
2720
173
237
418
671
1005
1424
1990
2620
3455
216
298
524
839
1260
1780
2490
3280
4320
255
353
619
990
1480
2100
2940
3870
5100
DCD90-180
Technical Handbook
General
Quality8,810,912,9
Tightening torque, Nm
Condition
Thread
UNF
12311
9350
00-11
P.Group 00
12
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2
13
26
47
75
114
164
227
396
629
937
1350
1860
2500
3260
11
23
42
66
101
145
202
352
560
834
1200
1655
2225
2900
14
29
53
85
128
185
256
447
710
1058
1525
2100
2825
3680
19
37
67
107
162
231
321
559
889
1320
1900
2630
3530
4610
System of units
The SI system of units is employed in this handbook:
The conversion factors are as follows:
*) Refrigerant R12 is no longer in production due to legislation
3
/h
9350
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P.Group 10
2
DCD90-180
Technical Handbook
1
Chassis
Description
9350
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P.Group 10
3
Chassis
The chassis consists of:
zA unit construction frame built up around two beams with a
minimum of welds for best possible strength.
zMountings for the drive axle, steered axle, mast, lifting cylin-
ders and transmission.
zThe necessary counterweights to provide a very low centre
of gravity. Moreover, the steered axle is designed to serve as
an additional counterweight.
zThe hydraulic oil tank and the fuel tank are produced as sep-
arate units and are bolted to the side of the chassis. The
tanks have a low profile, which contributes to the good visibility.
1. Hydraulic tank
2. Counterweights
3. Service hatch for the battery
4. Fuel tank
2
3
4
Chassis 90-180
DCD90-180
Technical Handbook
Operator’s cab
Description
Operator’s cab
The operator’s cab is a separate structure and rests on the chassis on rubber dampers. The operator’s seat, steering wheel and
hydraulic control levers can be adjusted for best possible operator comfort. Effective insulation minimises the vibrations and
sound level in the cab.
The standard heating system consists of a fan and heater for
heating the air in the cab by recirculation. Fresh air is drawn in
through a ventilation air filter. Full air conditioning, with cooling,
heating and dehumidification, is available to special order.
9350
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P.Group 10
4
1
2
3
1. Steering column with instrument panel and switches, ECS-terminal (option)
2. Air filter
3. Heating system
4. Electrical central unit
4
DCD90-180
Technical Handbook
3145 26
Operator’s cab
Description
9350
00-11
P.Group 10
5
KL735
1
23
4
F
N
R
R
145
23
L
0
a
bc
d
7
KL743
1. Gear selector
FORWARD/NEUTRAL/REVERSE 1/2/3
2. Lever DIRECTION INDICATORS/HORN
FRONT WINDSCREEN WASHER/
FRONT WIPERS/MAIN BEAM
3. Instrument panel
4. Steering wheel panel
5. Starting switch
6. Control lever, hydraulic functions
a. Lift, b. Tilt, c. Sideshift, d. Fork positioning
Surrounding the steering column are multi-function levers for
gear changing, indicators, windshield wipers, etc., as well as the
instrument panel with the ECS terminal. At the very foot of the
steering column is the steering valve (Orbitrol), activated by the
steering wheel via an angled gear. The steering column is
equipped with an adjustment handles for the alteration of steering
wheel height and rake.
9350
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P.Group 10
7
1
23
4
1
F
N
R
R
1
2
3
4
5
L
0
2
3
KL580A
4
1. Gear lever
2. Multi-function lever
3. ECS terminal
4. Steering wheel adjustment
handles
5. Angled gear
6. Orbitrol steering valve
KL588
6
5
Steering column
DCD90-180
Technical Handbook
Operator’s cab
Description
Pump and cylinder for cab tilting
A hydraulic cylinder is provided for tilting the cab. The hydraulic
fluid pressure for this purpose is generated by a manually operated pump. The pump is fitted with a reversing valve for upward or
downward tilting.
9350
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P.Group 10
8
1
2
3
2
4
1. Cab tilting cylinder
2. Manual pump
3. Vibration damper
4. Cab tilting cylinder
Pump and cylinder for cab tilting
DCD90-180
Technical Handbook
Operator’s cab
Description
9350
00-11
P.Group 10
9
3
1
1. Push-button, reverse gear
2. Push-button, forward gear
3. Microswitch
4. Engagemant and disenagagement of the
foot operated gear changing system
4
2
Accelerator pedal with change-over switches for forward and reverse
DCD90-180
Technical Handbook
Operator’s cab
Description
9350
00-11
P.Group 10
10
Gear selector type RMH
DCD90-180
Technical Handbook
Operator’s cab
Description
1
9350
00-11
P.Group 10
11
4
3
2
1. Indicator scale in the cab
2. Tank connection to the brake valve connecting block
3. Foot switch for weighing
4. Connection to the main valve LIFT section
Hydraulic weight indicator
DCD90-180
Technical Handbook
Operator’s cab
Service
Changing the fresh air filter
(every 200 hours or when needed)
1.Remove the filter casing retaining bolts and remove the filter
element.
2.Wash the filter insert with water and detergent or by using a
high pressure washer. Replace the insert if necessary.
3.Reinstall the filter insert.
9350
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P.Group 10
12
2
1
3
4
1. Brake pedal
2. Lubricating nipple
3. Locking screw
4. Shaft
Check and lubrication of brake pedal
(every 1000 hours)
1.Check and tighten the locking screws 3, so that the brake
pedal is securely fitted in the console.
2.Lubricate the brake pedal shaft through the nipples 2.
DCD90-180
Technical Handbook
Operator’s cab
Service
9350
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P.Group 10
13
Windscreen wipers
The wiper arms are fixed to the wiper motor shafts via conical
splines. The shafts are manufactured of hardened steel and the
wiper arm mounting of soft, pressed metal. When fitting, the nuts
must be tightened so hard that the splines are pressed well into
the mounting and function as a carrier.
Removal
1.Remove the wiper arms by loosening the nuts and thereafter
tapping and carefully rocking the arms to and fro.
Fitting
1.Check to ensure that the splines on the motor shaft are free
from the softer material from the wiper arm mounting.
1
If this is not the case, clean the splines so that they can
pressed fully into the wiper arm mounting.
2.Fit the wiper arms onto the motor shafts and tighten the nuts
to a torque of 16-20 Nm.
Hold the wiper arm to take up the torque pressure so that it
is not transferred to the motor, which could result in damage
.
IMPORTANT!
2
3
The nuts must be tightened sufficiently hard, otherwise
the shafts may start to slip inside the wiper arm mounting,
resulting in damage.
1. Wiper arm fitting
2. Securing nut, wiper arm
3. Grooved cone on motor shaft
4. Wiper motor
4
DCD90-180
Technical Handbook
1
Air conditioning unit
Description
Air conditioning unit
The air conditioning unit consists of the parts shown in the illustration and its function is to maintain the climate in the ope-rator’s cab as comfortable as possible. The air conditioning unit:
zheats the air when it is cold
zdehumidifies the air when it is humid
zremoves impurities from the air
zcools the air when it is warm
The equipment is steered by switches and controls on the instrument panel.
5
6
4
9350
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P.Group 10
14
1. Heating control
2. Heat exchanger
3. Vapourizer
4. Expansion valve
5. To condenser
6. To compressor
7. Heating valve
8. From engine
9. To engine
10. Fan
11. Fan
12. Fan control
13. Fresh air filter
14. Air disperser
15. Control defrost/cab
16. Defroster outlet
3
8
9
7
2
1516
12
14
10
11
13
The heating and ventilating system
DCD90-180
Technical Handbook
Air conditioning unit
Description
9350
00-11
P.Group 10
15
F
2
4
D
C
E
E
3
7
A
B
6
1. Liquid receiver/filter dryer
2. Evaporator
3. Fan
4. Expansion valve
6. Condenser
7. Compressor
1
G
A High-pressure gas
B High-pressure liquid
C Low-pressure liquid
D Low-pressure gas
E Warm air in cab
F Cooled air to the cab
GOutside air for removing heat
DCD90-180
Technical Handbook
Air conditioning unit
Description
Compressor
The air conditioning system is driven by the compressor. This
performs as a pump, drawing cold, low-pressure gas from the
evaporator, compressing it and thereby raising its temperature,
and discharging it at high pressure to the condenser.
The compressor is driven by V-belts directly from the diesel engine. Switching between operation and idling is controlled by an
electro-magnetic clutch which, in turn, is controlled by a thermostat whose sensor is located between the fins of the evaporator
coil. The thermostat switches off the compressor at low temperatures, to prevent icing of the evaporator.
Condenser
The function of the condenser is to convert the hot high-pressure
gas from the compressor into liquid form. The tubes and fins of
the condenser coil absorb heat, which is then removed by the air
delivered by the fan.
The temperature of the refrigerant in the condenser varies from
about +50°C to +70°C. The pressure varies between 12 and 20
bar, depending on the ambient temperature and the flow of air
through the condenser. When the refrigerant is condensed into
liquid form, it is transferred under pressure to the liquid receiver/
filter dryer.
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P.Group 10
16
Liquid receiver with filter-dryer
The function of the liquid receiver with integrated filter dryer is to
collect the liquid coolant, bind the moisture, and to filter and remove impurities. The receiver, which is located in the condenser
housing, also serves as the expansion vessel in the refrigeration
circuit.
After flowing through the dryer in the bottom of the liquid receiver,
the refrigerant flows through a riser tube. A sight glass enables
the operator to check that the liquid flows without the presence of
any bubbles, and that the system is filled with a sufficient amount
of refrigerant.
Expansion valve
The expansion valve throttles the flow and passes an optimised
quantity of refrigerant that the evaporator is capable of evaporating.
The expansion valve is also the part of the circuit which separates
the high- pressure side from the low-pressure side. The refrigerant flows to the expansion valve under high pressure and leaves
it under low pressure.
The amount of refrigerant which passes the evaporator varies,
depending on the thermal load. The valve operates from ’fully
open’ to ’fully closed’ and in-between searches for a point to give
optimum evaporation.
Evaporator
The heat necessary for evaporating the refrigerant is extracted
from the cab air which is circulated by a fan through the evaporator coil. The cab air is thus cooled, and is distributed and returned
to the cab.
In the evaporator, the refrigerant reverts to the gaseous state and
returns to the compressor suction, thereby completing the cycle.
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