Hatz Diesel 1B20V User manual

33
1B20V
1B30V
1B40V
1B40W
1B50V
1B50W
Translation of the
ORIGINAL INSTRUCTION BOOK
0000 433 802 77 - ENG- 01.11 - 0.1
Printed in Germany

A new HATZ Diesel engi ne - working for you
This engine is intended only for the purpose determined and tested by the manufacturer of the
equipment in which it is installed. Using it in any other manner contravenes the intended purpose.
For danger and damage due to this, Motorenfabrik HATZ assumes no liability. The risk is with the
user only.
Use of this engine in the intended manner presupposes compliance with the maintenance and repair
instructions laid down for it. Noncompliance leads to engine breakdown.
Please do not fail to read this operating manual before starting the engine. This will help you to avoid
accidents, ensure that you operate the engine correctly and assist you in complying with the mainte-
nance intervals in order to ensure long-lasting, reliable performance.
Please pass this Instruction Manual on to the next user or to the following engine owner.
Always have service work performed by qualified specialists. To this effect, we recommend that you
consult one of the 500 HATZ servi ce stati ons. There, your engine is repaired by staff who constantly
undergo training and who use both original HATZ spare parts and HATZ tools. The world-wide HATZ
service network is also available to you for consultation and spare parts supply.
For the address of your nearest HATZ servi ce station, please refer to the attached list or the internet
under: www. hatz-di esel . com
The installation of inappropriate spare parts may cause problems. We cannnot accept any liability for
damage or consequential damage resulting therefrom.
Thus, we recommend that you use ori gi nal HATZ spare parts. These parts are manufactured follow-
ing the strict HATZ specifications and ensure, thanks to their perfect fit and function, maximum oper-
at i ng r el i abi l i t y. For t he r ef er ence number, pl ease con sul t t he at t ached spar e par t l i st or t he i nt er net
under: www. hatz-diesel . com. Please take the complete spare parts kits in Table M00 into account.
We reserve the right to make modifications in the course of technical progress.
MOTORENFABRIK HATZ GMBH & CO KG
1

Page
1. Important safety notes
when operati ng the engine 3
2. Descri pti on of the engi ne 5
3. General notes 6
3.1. Technical data 6
3.2. Transport 7
3.3 Notes on installation 7
3.4. Load on engine 7
3.5. Type plate 7
4. Operation 8
4.1. Prior to first-time start-up 8
4.1.1. Engine oil 8
4.1.2. Fuel 9
4.2. Starting 10
4.2.1. Preparations for starting 10
4.2.2. Recoil start for versions without
electri c star ter 11
4.2.3. Recoil start for versions with
electri c star ter 12
4.2.4. Electric starter 12
4.3. Stopping the engine 14
5. Maintenance 16
5.1. Maintenance chart 16
5.2. Maintenance ever y 8 – 15
operating hours 18
5.2.1. Checking engine oil level 18
5.2.2. Check ai r i ntake area f or
combustion and cooling 18
5.2.3. Check air cleaner maintenance
indicator 18
Page
5.3. Maintenance every 250
operating hours 19
5.3.1. Changing engine oil 19
5.3.2. Checking and adjusting
val ve cl earances 19
5.3.3. Cleaning the air cleaner zone 21
5.3.4. Checking screw connections 21
5.3.5. Cleaning the exhaust mesh inlet 21
5.4. Maintenance every 500
operating hours 23
5.4.1. Renewing fuel filter 23
5.4.2. Air cleaner maintenance 23
5.5. Maintenance every 1000
operating hours 25
5.5.1. Cleaning the oil filter 25
5.6. Servicing: once a year 27
5.6.1. Draining the fuel tank 27
6. Mal functi ons – causes – remedies 28
7. Work on the electrical system 32
8. Storage out of use 32
Declaration for Incorporation 33
2
Contents
This symbol identifies important safety precautions.
Please comply with these most carefully in order to avoid any risk of injury to persons or
damage to materials.
General legal requirements and safety regulations issued by the competent authorities or
industrial accident insurers must also be complied with.

1. Important safety notes when operating the engine
HATZ diesel engines are efficient, strong and durable. For this reason they are frequently installed on
equipment used for commercial purposes.
The manufacturers of such equipment must observe any relevant equipment safety regulations when
the engine forms part of an overall system.
A few general points concerning operating safety should none the less be noted.
Depending on the engine’s operating and installation conditions, equipment manufacturers and their
users may have to fit safety or protective devices in order to prevent improper use. Examples:
– Exhaust system components as well as the surface of the engine will naturally be hot and must not
be touched while the engine is running or until it has cooled down after being stopped.
– Incorrect wiring or improper operation of the electrical system may cause sparking and must there-
fore be avoided.
– Provide protection against contact with rotating parts once the engine is connected to the driven
equipment or machine.
HATZ protective guards are available for the belt drive of the cooling fan and alternator drive
systems.
– Always observe the start-up information in the operating instructions before starting the engine:
thi s i s parti cularl y i mportant when starting an engi ne wi th the recoi l starter !
– Mechanical starting devices should not be operated by children or persons deficient in physical
strength.
– Check that all safety devices are in place before starting the engine.
– Ensure that operation, maintenance and repair of the engine are undertaken by suitably trained
personnel only.
– Pr ot ect t he st ar t er key agai nst unaut hor i sed use.
– Do not run the engine in closed or badly ventilated rooms.
Do not breath in emissions – danger of poisoning!
– Also fuel and lubricants could contain poisonous components. Please follow the instructions of the
mineral oil producer (safety data sheets).
3

Important safety notes when operati ng the engi ne
– The engine must be stopped before performing any maintenance, cleaning- or repair work.
– Stop the engine before refilling the fuel tank.
Never refuel near a naked flame or sparks which could start a fire. Don’t smoke. Don’t spill fuel.
– Keep explosive materials as well as flammable materials away from the engine because the exhaust
gets very hot during operation.
– Wear close-fitting clothing when working on the engine while it is running.
Please don’t wear necklaces, bracelets or any other things which you could get caught with.
– Please pay attention to all advice- and warning stickers placed on the engine and keep them in legi-
ble condition. In case a label has come off or is no longer clearly legible, it must be replaced imme-
diately. To this effect, please contact the HATZ service station in your area.
– We accept no liability for damage resulting from improper modifications to the engine.
Regular maintenance in accordance with the details given in these operating instructions is essential
to keep the engine in good working order.
When in doubt, consult your local HATZ service stati on before starting the engine.
4

2. Descri pti on of the engi ne
5
Fi g 1
1 Fuel tank cap
2 Recoil starter
3 Dr y- t ype ai r cl eaner
4 Intake opening for cooling and
combustion air
5 Voltage regulator
6Startermotor
7 Noise insulating hood
8 Lifting lug
9 Engine shutdown pin
10 Speed control lever
11 Oil filler pipe
12 Oil filter
13 Oil drain plug
14 Dipstick
15 Exhaust mesh insert
16 Exhaust silencer
17 Type plate

3. General notes
3. 1. Techni cal data
1)
These val ues are i nt ended as an approxi mate gui de. The max. mar king on t he dipsti ck is t he
determining factor, Fig. 7.
2)
Depending on model (see maintenance charts, chapter 5.1)
3)
Exceeding these limits causes engine breakdown.
Ti ghteni ng torques
Item Nm
Oil drain plug 50
Typ e 1B20 V 1B30 V 1B40 V/ W 1B50 V/ W
Design Air-cooled four-stroke diesel engine
Combustion system Direct injection
Number of cyl i nders 1 1 1 1
Bore/stroke mm 69 / 65 80 / 69 88 / 76 93 / 76
Di spl acement cm
3
243 347 462 517
Lubricating oil capacity l, approx. 0.9
1)
1.1
1)
1.5
1)
1.5
1)
Difference between
„max.“ and „min“ levels l, approx. 0.5
1)
0.5
1)
0.8
1)
0.8
1)
Lubricating oil consumption
after a running-in period max. 1 % of fuel consumption at full load
Lubricating oil pressure
(oil temperature 100 °C) approx. 2.5 bar at 3000 r.p.m.
Direction of rotation,
power take-off end counterclockwise
Valve clearance 10 - 30 °C
Inlet and exhaust valve mm 0.20 0.10 0.10 0.10
or automatically
2)
Max. angle from vertical in any
direction (continuous operation) 25°
3)
Weight ( i ncl . f uel tank, air-cl eaner,
exhaust si lencer, r ecoil start er and
electric starter)
kg
approx. 35 42
1B40 V : 55
1B40 W: 57
1B50 V : 56
1B50 W: 58
Battery capacity min / max 12 V - 36 / 60 Ah 24 V - 24 / 44 Ah
6

3.2. Transport
A suspensi on lug „ 8“ i s provi ded as
standard equi pment, so that the engi ne
can be l ifted safely, chap. 2. It i s not suitabl e
or approved for li fti ng the compl ete equipment
to whi ch the engi ne is attached.
3.3. Notes on instal lation
If you have an engine which is not yet installed
in a machine and still has to be installed, make
sure that the Assembly Instructions for HATZ
Di esel Engi nes are complied with prior to instal-
lation. These Assembly Instructions contain im-
portant information about safe assembly of the
engine and are available from your the HATZ
ser vi ce cent er i n your area.
Pendi ng compl ete instal lati on, the engi ne
must not be started !
Moreover, we would like to point out that in this
case, commissioning of the machine is also pro-
hibited until it has been verified that the machine
into which this engine is to be incorporated
complies with all the safety precautions and reg-
ulations provided by law.
Refer also to the Decl arati on for Incorporation
at the end of these Operating Instructions.
2
The permi tted l oads and el ements
on the speed adjusti ng l ever and the
engine shutdown pin should be observed as an
excess can l ead to damage to the contacts and
inner governor parts, Fi g. 2.
3.4. Load on engi ne
Operating the engine for a lengthy period off-
load or at ver y low l oads can af fect i t s runni ng
quality. We therefore recommend a minimum
engine load of 15 %. If operated at such low
loads, it is best to operate the engine at a signifi-
cantly higher load for a short period before
switching it off.
3.5. Type plate
3
The type plate is placed on the noise insulating
hood (Fig. 1) and includes the following engine
information:
➀engine type
➁code (only for special equipment)
➂engine number
(also stamped on crankcase, Fig. 4)
➃max. engine speed.
For any offer as well as spare parts orders it is
necessary to mention these data (also see spare
parts list, page 1).
➀➁
➂
➃
7

4
Engine serial number on crankcase.
4. Operation
4.1. Before starting up for the
first time
Engines are normally supplied dry, i.e. not con-
taining fuel or oil.
4.1.1. Engi ne oi l
Oi l qual i ty
Qualified are all trademark oils which fulfil at
least one of the following specifications:
ACEA – B2 / E2 or more significant
API – CD / CE/ CF / CF-4 / CG-4 or more
significant.
If engine oil of a poorer quality is used, reduce
oil change intervals to 150 hours of operation.
Oi l vi scosity
5
Please select the recommended viscosity de-
pending on the ambient temperature at which
the engine is operated.
Inappropri ate engi ne oil may shorten the
engine’s servi ce life si gni fi cantly.
-40
-30
-20
-10
0
10
20
30
40
50
104
86
68
50
32
14
-4
-22
-40
OIL: SAE...
°C°F
5W/30
5W/40
10 W/40
10 W /30
15 W / 4 0
30
40
122
10 W
8

When adding oil or checking the oil level, the
engine must be horizontal.
6
– Remove oil filler screw „1“ and dipstick „2“.
7
– Add engine oil up to the MAX mark on dip-
stick.
Lubricating oil capacity: see Chapter 3.1.
– Insert the oil filler screw and tighten it (hand-
tight only).
Attenti on !
If the engine is operated while the oil level is
below the mi n. mark or above the max. mark,
it can cause damage to the engine.
4.1.2. Fuel
Stop the engine before refill i ng the fuel
tank. Never refuel near a naked fl ame
or sparks which could start a fire.
Don’ t smoke. Use onl y pure fuel and cl ean
fi l ling equipment. Take care not to spi l l fuel.
All diesel oils which satisfy the following specifi-
cat i ons ar e sui t abl e:
EN 590 or
BS 2869 A1 / A2 or
ASTM D 975 -1D / 2D
Important !
The use of fuels of different specificati ons
requi res the prior written consent of the HATZ
headquarters.
8
– Before the first start or if the fuel tank has
been run dry, completely fill the fuel tank with
di esel . The bleeding of t he fuel syst em is auto-
matically.
9

At temperatures below 0 °C, winter-grade fuel
should be used or paraffin added to the fuel well
in advance.
4.2. Starting
Do not run the engi ne in closed or
badly venti l ated rooms – danger of poi-
soning! Before starting the engi ne, ensure that
no-one i s i n the danger area close to the en-
gine or equi pment, and that all protective
guards are fi tted.
4. 2.1. Preparati ons for starti ng
If possible, disengage the engine from any
driven equipment.
The auxiliary equipment should always be placed
in neutral.
Recoil starter
9
Check the starter rope for chafing and,
if necessary, repl ace it.
A damaged rope may break duri ng
starti ng, and cause injury.
0000 053 338 01
Lowest ambient
temper at ur e when
starting, in °C
Paraffin content for:
Summer Winter
fuel fuel
0 up to –10 20 % –
–10 up to –15 30 % –
–15 up to –20 50 % 20 %
–20 up to –30 – 50 %
10
– Set speed control lever „ 1“; First of all put the
lever in STOP-position and then either to
1/2 START or max. START position, as desired
or necessary.
Start i ng at a l ower speed wil l help to prevent
exhaust smoke.
– Now, the engine is ready for starting.
Important !
After long-time standstill (approx. 6 months or
even longer) or first operation, operate engine
with low adjusted speed and without load for
approx. 20 sec. after start. This measure assures
a lubrication of all bearings before increasing
speed and l oad.
It also prevents an insufficient lubrication.
10

11
Never use starti ng sprays !
4.2.2. Recoil start for versi ons wi thout
el ectri c starter (ti l l -6 °C)
– For starting preparations, see Chapter 4.2.1.
Starting procedure
12
– Pull the starting cable out by the handle until
you feel a slight resistance.
– Let the cable run back; in this way the entire
length of the starting cable can be used to
start the engine.
– Devices which are not securely fastened
should be restrained with the foot.
13
– Grip the handle with both hands.
14
– Commence pulling the starting cable vigorous-
ly and at an increasing speed (do not jerk it
violently) until the engine starts.
11

Not e:
If after several attempts of starting the exhaust
begi ns t o emit whit e smoke, move t he speed
control lever to the STOP position and pull the
starting cable out slowly 5 times. Repeat the
starting procedure, Chapter 4.2.1.
4.2.3. Recoil start for versi ons wi th
el ectri c starter (ti l l -6°C)
The r ecoil start er at engi nes wit h electr i c start i s
an emergency starting device wi thout decom-
pression automatic.
Therefore, attenti on has to be pai d to the exact
starti ng procedure as menti oned bel ow.
– Pr epar e t he engi ne for start i ng;
see Chapter 4.2.1.
– Pull out the handle with the cord slowly until
compression resistance is clearly felt; Fig. 12.
– Continue to pull slowly but with greater force
until the resistance becomes noticeably less
(compression overcome).
– Now let the cord run back - the engine is in
the correct starting position.
In this way the engine can be accelerated
through about one and a half revolutions with
the starting cord, to overcome compression re-
sistance and achieved the required momentum
for starting.
– Support equipment with the foot if it is too
light in weight or liable to tip over.
– Take hold of the handle with both hands;
Fig. 13.
– Pull the starting cord up forcefully and at an
incr easing speed (but do not jer k i t) - t he en-
gine should then start; Fig. 14.
Not e:
In the case of engines with automati c el ectrical
shutdown system (see next chapter), first
act uat e t he st ar t er swi t ch f r om posi t i on 0 t o
positi on I, then perform a recoil start within the
following 12 seconds. If the engine does not run
after 12 seconds, this means that the electrical
system blocks the fuel supply to the injection
pump.
In this case, the engine cannot be started.
As a solution, turn the starter key back to posi-
ti on 0, then turn it to positi on I again. Now, start
the engine within the following 12 seconds.
4.2. 4. El ectri c starter
– For starting preparations, see Chapter 4.2.1.
15
– Insert the key to i ts stop and turn it to
position I.
– Battery charge telltale „2“ and oil pressure
warning „3“ must light up.
– Turn start key to posi tion II.
– As soon as t he engi ne r uns, r elease t he st ar t
key. It must return to position I by itself and
remain in this position during operation.





12

– The battery charge telltale and oil pressure
warning must go out immediately after start-
ing. Indicator light „1“ is on when the engine
is in operation; Fig. 15.
– The engine temperature display „ 4“ (additional
equipment) lights up if the temperature at the
cylinder head becomes too high.
Swi tch off the engi ne and trace and eli mi -
nate the cause of the problem, chap. 6.
– Always turn the start key back to posi ti on 0
before re-starting the engine. The repeat lock
in the ignition lock prevents the starter motor
from engaging and possibly being damaged
while the engine is still running.
Not e:
Start for max. 30 seconds. If the engine does
not run after this time, turn starter key back to
positi on 0 and eliminate the cause, Chapter 6.
Preheati ng devi ce wi th automatic heati ng
ti mer (additional equipment)
The preheating light „ 5“ lights up additionally at
temperatures below 0° Celsius (Fig. 15).
– After the light has gone out, start the engine
without delay.
Fuel shut-off val ve, stop sol enoi d
(additional equipment)
16
As soon as the starting key is at Posi tion I,
fuel shut-off valve „ 1“ is el ectri cally rel eased.
The fuel feed to the injection pump is then open
and the engine is ready to start.
When the engine is running, turning the starting
key to posi ti on 0 cl oses the shut-off val ve and
interrupts the fuel supply to the injection pump,
so that the engi ne stops; Chapter 4.3.
This shut-off valve is also used for the automatic
electrical shutdown system.
Emergency start
If the shut-off valve is blocking the fuel supply
as a result of an el ectri cal faul t and the engi ne
therefore cannot be started, an emergency start
can be attempted.
Proceed as follows for this:
– For emergency starting, turn the lever at fuel
shut-off solenoid „ 2“ anti-clockwise by at least
90° using suitable pliers. The lead seal wire
will break off.; Fig. 16.
13

– As soon as the emergency start lever is in the
starting position, the electric starter or recoil
starter can be used; Chapter 4.2.2 and 4.2.3.
The oil level must always be checked before an
emergency start, as insufficient oil pressure
can lead to complete damage of the engine
within a very short time.
After this, the engine can only be
stopped with the starting key in the
emergency operating mode if the emergency
starting lever is first turned back clockwise to
the stop position.
I mmedi at el y af t er a per i od of em er gency
running, ascertain the cause of the fault and
have it rectified; Chapter 6.
Have t he emer gency-st ar ti ng lever sealed once
again by a HATZ service point.
When the automatic electrical shutdown system
is used, the emergency start described above
means that liability for risks must be accepted
by the operator (Motorenfabri k HATZ assumes
no l i abi l ity) !
In case of difficulty contact the nearest HATZ
service point.
Automatic el ectrical shutdown system
(additional equipment)
This is characterized by a brief flashing of all
pilot lamps once the starter key has been turned
to posi tion I (Fig. 15).
Important !
If the engine cuts out immediately after starting
or switches off by itself during operation, a
moni toring el ement in the aut omatic shutdown
system has tripped. The corresponding indicator
light (Fig. 14, positions 2 - 4) will come on.
After the engine has stopped, the display contin-
ues to glow for about 2 minutes.
The el ect r ical devi ce then swi tches it sel f off au-
tomatically.
The display lights up again after the start key
has been turned back to positi on 0 and then to
positi on I again.
Trace and eliminate the cause of the operati ng
faul t before tryi ng to restart the engi ne
(see chapter 6.2.).
The display light goes out when the engine is
next started.
Even with automati c shutdown monitoring
the oi l level must be checked every 8 – 15
operating hours (Chapter 5.2.1.).
4.3. Stopping the engine
17
– Move the speed adjustment lever „ 1“ back
to the STOP position. The engine cuts out.
14

Not e:
Engines with a fi xed lower i dl ing speed cannot
be switched off using the speed adjustment
lever. See the paragraph entitled „ Other ways of
switching off the engine“ .
Other ways of switchi ng off the engi ne
1. Fuel shut-off valve, stop sol enoi d
(optional extra)
– Turn ignition key to the 0 posi ti on. The engine
cuts out, Fig. 19.
2. Stop pin (optional extra)
18
– Press the stop pin „2“ until the engine cuts out
(see also Fig. 17, pos. 2).
– Once the engine has cut out, release the
pin „2“ and ensure that it returns to its initial
position, Fig. 17.
05221301
19
Depending upon the model, the battery charge
indicator „2“ and oil pressure warning indicator
„3“ will come on again after the engine comes to
a stop.
– Turn the key to posi ti on 0 and remove it.
All the indicator lights must go out.
Not e:
Failure to return the starter key to position 0
may result in the battery being totally
discharged.
If operation of the engi ne is inter-
rupted for any reason, or at the end of
the working day, the starter key shoul d be kept
out of reach of unauthori sed persons.
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15

5. Maintenance
Onl y carry out maintenance work wi th the engi ne swi tched off.
Observe al l rel evant l aws and regul ations governi ng the handl i ng and di sposal of used oil,
fi l ters and cl eani ng agents.
Protect the starting key against unauthori sed use.
On engines with an el ectri c starter, disconnect the battery’s negati ve termi nal .
When mai ntenance work has been completed, check that all tool s have been removed from the
engine and all protective guards fitted again.
Before starti ng the engi ne, ensure that there are no persons in the danger area cl ose to the en-
gine or equi pment.
5.1. Mai ntenance chart
Mai ntenance i nterval Maintenance work required Chap.
16
Every 8 – 15
operating hours,
or before each daily
start-up
Check oil level.
Check combustion and cooling air intake zone.
Check air-cleaner maintenance indicator.
5.2.1.
5.2.2.
5.2.3.
Every 250
operating hours
Change engine oil.
Check and adjust valve clearances. (Not applica-
bl e wi t h automat i c self adj usting valve cl earance
models, see next page)
Cl ean cool i ng ai r area.
Check screw connections.
Clean mesh insert for exhaust.
5.3.1.
5.3.2.
5.3.3.
5.3.4.
5.3.5.
Every 500
operating hours
Change fuel f i lter element .
Dry-type air cleaner maintenance.
5.4.1.
5.4.2.
Every 1000
operating hours Cl ean t he oi l f i l t er. 5.5.1.
Once a year Siphon water out of fuel tank. 5.6.1.
8- 15
250
500
1000

Depending whether the engine is equipped with
or without automatic valve clearance adjustment
one of the illustrated maintenance plans is in-
cluded. This label should be affixed to the engine
or equipment in an easily visible position. The
maintenance chart governs the maintenance in-
tervals.
On new or recondi ti oned engi nes, after the
fi rst 25 operati ng hours, always
– Change engine oil, Chapter 5.3.1.
– Check valve cl ear ances and adjust i f
necessary, Chapter 5.3.2.
– Examine screw connections, chapter 5.3.4.
Do not ti ghten the cyl i nder head fastening.
If the engi ne i s not used frequentl y, change the
engine oil after 12 months at the l atest, regard-
less of the actual number of hours it has been in
operation.
17
Model wi thout automatic valve clearance adjustment.
Model wi t h automat i c valve cl earance adjust ment.
1B20: 0,20mm 1B27: 0,10mm
1B30: 0,10mm 1B40: 0,10mm
1B50: 0,10mm
0000 051 104 06
= 1h
max
OIL
500h
250h
IN
EX
max
0000 052 502 02
= 1h
max
OIL
500h
250h
IN
EX
max
AUTOM.

5.2. Mai ntenance every 8 – 15
operating hours
5.2.1. Checki ng engi ne oi l l evel
To check the oil level, the engine must be
standing level and be switched off.
– Remove any dirt from the oil dipstick area.
20
– For oil level inspection, remove the dipstick
and wipe it dry using a lint-free, clean piece of
cloth; then insert it to its stop and pull it out
agai n.
– Check the dipstick oil level and, if necessary,
add oil to the max. mark, Chapter 4.1.1.
Attenti on !
If the engine is operated while the oil level is
below the mi n. mark or above the max. mark, it
can cause damage to the engine.
5.2.2. Check ai r i ntake area for
combusti on and cooling
Heavy contamination is an indication that in-
creased dust accumulation necessitates a
correspondingly shorter maintenance interval,
Chapter 5.3.3. and 5.4.2.
21
– Check air intake points „ 1“ for severe blockage
due to leaves, heavy dust accumulation etc.,
and i f necessar y clean t hem.
5.2.3. Check ai r cl eaner maintenance
i ndi cator (optional extra)
Mechanical servi ce indicator
22
– Increase the speed of the engine briefly to the
maximum. If the rubber bell ows shri nks and
covers the green ar ea „ 1“ , t he ai r cl eaner sys-
tem should be serviced, Chapter 5.4.2.
Under dusty conditions, check the rubber
bellows several times per day.
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