WITTUR WHB 40x80 User manual

Blatt/sheet D550MGB.000
Datum/date 14.05.2001
Stand/version 25.01.2003
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
D550MGB 01.03
Hydraulic contact buffer WHB
WITTUR AG
Rohrbachstraße 26 - 30 lD-85259 Wiedenzhausen, Germany
Tel. [phone] lFax +49 (0) 81 34/18-49
http://www.wittur.com lE-Mail: [e-mail]
No reprints, translations or reproductions in any form
whatsoever - to include partial sections as well - are
permitted without the written consent of WITTUR AG.
We reserve the right to change the specifications in-
cluded in this operating instructions and illustrations
without notice.

Blatt/sheet D550MGB.001
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
1 General information prior to installation
1.1 Description and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.002
1.2 Liability and guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.002
1.3 Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.003
1.4 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.004
1.5 Working with hydraulic installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.004
1.6 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.005
1.7 Name plate, designation, identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.006
1.8 Content of supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.007
2 Installation
2.1 Installation of the hydraulic contact buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.008
2.2 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.009
3 Commissioning / Functional testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.010
4 Maintenance, checks and repairs
4.1 Maintenance and checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.011
4.2 Regular inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.011
4.2.1 Extended piston rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.011
4.2.2 Oil level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.011
4.2.3 Gas pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.012
4.2.4 General visual inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.012
4.3 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.012
4.3.1 Removing the protection tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.012
4.3.2 Relieving gas pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.012
4.3.3 Correction of the oil level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.012
4.3.4 Gas refilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.013
4.4 Ordering spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.013
4.5 Measures during operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.014
4.6 Carrying out repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.014
5 Specifications
5.1 WHB 40 Contact buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.015
5.2 WHB 50 Contact buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D550MGB.016
Contents Sheet

Blatt/sheet D550MGB.002
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
1.1 Description and function
The hydraulic contact buffer type WHB is an
energy dissipation type buffer according to EN
81-1/2 and therefore can be universally used for
all applications in the construction of elevators.
The design type approval permits the use in pas-
senger and freight elevators both under the car
and under the counterweight.
Functional description (see fig. sheet 3)
In the case of a buffer stroke the piston rod (2) is
forced into the cylinder tube (1) and the hydrau-
lic fluid (3) in the tube is displaced and forced to
the outside through small throttling ports (4) in
the tube wall. The fluid accumulates within the
jacket tube (5).
At the same time the gas volume (6) above the
hydraulic medium is further compressed. The sea-
ling system (7) maintains a reliable seal between
the hard chromium-plated piston rod and the
atmosphere.
After the buffer stroke and return to hydraulic
balance the compressed gas volume forces the
displaced fluid back into the cylinder and extends
the piston rod.
The level of the hydraulic fluid at the gas interfa-
ce can be read at any time through the sight
glass (9) without opening the unit.
An elastic impact plate (16) damps the impact
and reduces the noise.
The limit switch (13) monitors the extended ready
position of the buffer. The limit switch is actuated
by pressure on the piston rod by the linear
slide (17) or the protection tube (10) respectively.
In the case of buffers equipped with a protection
tube (10), for maintenance work the screws (12)
on the buffer head (11) are removed. Subsequent-
ly, the protection tube can be lowered, which
simultaneously actuates the switch (13). The oil
filler screw (14) and the gas-filling valve (15) will
then be accessible.
In the normal operating state the protection tube
avoids damage and contamination of the piston
rod
1.2 Liability and guarantee
These operating instructions are intended for per-
sons who are familiar with the installation and
maintenance of lifts. Adequate knowledge of lift
construction is a prerequisite.
The WITTUR firm carries no responsibility for da-
mage caused by inpropriate or other actions un-
dertaken without adherance to these operating
instructions and thus compromising the qualities
of the product.
The warranty obligation of the WITTUR firm may
be inapplicable, if the component has been used
other than described in these instructions
Unless stated otherwise, the following are not
permissible due to technical safety reasons:
-installing the wrong buffer or one intended
for a different purpose according to these
instructions
-make changes of any kind to the hydraulic
contact buffers
furthermore
- carrying out faulty or improper maintenance,
maintenance or inspection checks and
- using unsuitable accessories, spare parts or
operating material which has neither been
released by the WITTUR Company nor consists
of original WITTUR spare parts.
1 General information prior to installation

1.3 Review
Blatt/sheet D550MGB.003
Datum/date 14.05.2001
Stand/version 14.05.2001
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THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
fig. 1: Buffer with protection tube fig. 2: Buffer with linear slide
1
10
9
7
6
5
4
3
2
X
14 15
12
13
11
16 16
11
2
7
15
6
9
1
3
5
4
14
13
17

Blatt/sheet D550MGB.004
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
1.4 Safety precautions
In general, installers and servicers of WITTUR
products are responsible for working safety
themselves.
The observance of all relevant safety measures and
legal stipulations is the prerequisite for the pre-
vention of harm to persons or to the product in
the course of installation, maintenance and
servicing work.
Especially important indications for safety and
damage prevention are highlighted by the
following symbols:
General risk indication
Indication of increased risk of injury (ex-
ample by quenching edges, etc.)
Indication of risk of damage to compo-
nents (example through installation errors,
etc.)
+Indication of important information
These operating instructions belong to the general
installation and must be kept in a protected place
which is accessible at all times (example machine
room).
The use of properly trained specialist personnel is
a precondition for the professionally correct
assembly and installation of the contact buffer.
The training of this personnel is the responsibility
of the company contracted to carry out the tasks
involved.
1.5 Working with hydraulic installations
Basic instructions are given in the following
section which are always to be observed without
fail during work on hydraulic installations. It will
be assumed in later chapters that these instruc-
tions are already known, and for that reason they
will not as a rule be given again.
Work safety
Work which is improperly carried out can
lead to serious accidents, as can inattenti-
on.
• Inspect the contact buffer regularly for leaka-
ges and damage
• Immediately remove oil spills from the floor
Use extreme caution when welding.
Hydraulic oil is highly flammable!
Cleanliness
Contaminations in hydraulic components led to
increased wear, breakdowns and damage. Thus the
greatest possible cleanliness must be observed!
The installation site must be itself in a dry state.
• Remove protection covers, oil-paper wrappings,
etc. immediately before beginning installation.
• Clean the surrounding area before loosening
screwed connections.
• Make sure that packing surfaces are clean befo-
re installation.
• Cover moving parts, friction sealing surfaces
(example piston rods) before paint work as well
as masonry and welding work.
·Use a filter screen when filling with oil
Transport and storage
The corresponding safety rulesand accident pre-
vention regulations apply to the transport and
storage of hydraulic components as well.
• Never drop or throw hydraulic components.
Heavy bumps and blows should be avoided.
Keep the storage temperature between 5° C and
50 °C for hydraulic components. Storage should
take place in a dry, clean room which can be
locked

Blatt/sheet D550MGB.005
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
If the buffer is supplied with pressed-in
piston rod, the securing devices should be
removed. Cut the securing straps at the
side when the buffer is standing upright.
Warning! The extending piston rod can
cause injury!
Installation
During installation or when replacing com-
ponents the following guidelines must be
observed:
By appropiate measures, an automatic
switching on or automatic start-up of the
the drive is to be prevented!
• Use only materials (example hydraulic oil) clea-
red by the WITTUR firm or. WITTUR original
spare parts
• Do not use sealing mediums like silicon, hemp,
Teflon tape or putty. They could infiltrate the
hydraulic system.
• Grease seals lightly before mounting. Make su-
re they sit correctly
• Tighten mounting bolts evenly
Maintenance
During inspection and maintenance:
• Leakages and their causes must be eliminated
without delay
• Waste oil and oil-containing wastes must dis-
posed of in an environmentally-friendly man-
ner.
1.6 Preparation
Before installation work begins, it is in your own
interests to clarify what structural and spatial
conditions are available for installation work.
Therefore it is recommended that all circum-
stances be taken into consideration, and to men-
tally plan the installation sequence before any
rash or badly planned work is carried out.
Observe the safety measures for work per-
formed on elevator installations.
- The bottom of the shaft pit must be construc-
ted (s. EN 81), such that it can withstand the
force of pressure which occur.
- The floor must be dry and clean and covered
with an oil-resistant coating.
+The first check should be to ensure that
the operating conditions of the buffer do
not exceed.
Among the data on the buffer type plate there is
included:
- Piston diameter and rope
- Minimum and maximum impact mass
- Rated speed
• Verify the size of the remaining lower refuge
(see chapter: “Installation“)
Waste oil

The name plate of the contact buffer is fixed to
the surface of the cylinder tube. The operator of
the installation bears the responsibility for its
legibility.
The data of the name plate are to be compared
with the order specifications.
Blatt/sheet D550MGB.006
Datum/date 14.05.2001
Stand/version 25.01.2003
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
1.7 Name plate, designation, identification
Puffertyp Art. Nr. ø x Hub Zulassungsnummer
buffer type art. no. ø x stroke approval number
WHB 40 x 80 5L300061 40 x 80 08/208/APH004/01
WHB 40 x 120 5L300062 40 x120 08/208/APH004/02
WHB 40 x 175 5L300063 40 x175 08/208/APH004/03
WHB 40 x 275 5L300064 40 x275 08/208/APH004/04
WHB 50 x 425 5L300065 50 x425 08/208/APH004/05
WHB 50 x 695 5L300066 50 x695 08/208/APH004/06

Blatt/sheet D550MGB.007
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
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THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
1.8 Content of supply
+Upon receipt, check delivery for correct-
ness, completeness, and condition.
Compare in particular article numbers,
amount and type description with the
order details.
+The contact buffer is supplied ready for
installation and already filled with oil
(HLP ISO VG 46 DIN 51524).
+Heavy-load dowels and masonry bolts
(M 16x160 DIN 529 with nuts and was-
hers 18 DIN 126) do not belong to the
content of supply and must be ordered
according to contract.
Depending on the order, the content of supply
can cover the following positions:
Hydraulic contact buffer with:
- protection tube
or
- linear slide
- elastic impact plate
- limit switch
- oil
Operating instructions
Optional:
- bolt anchor
- console
- screw set
3
4
2a 2b 2c
1f
1a 1c 1d
1b 1e
4 Screw set
3 Console
2c Heavy load dowel
2b Masonry bolt with nut M 16x160 DIN 529
2a Bolt anchor M 16-30 5A100005
1f Contact buffer WHB 50x695 5L300066
1e Contact buffer WHB 50x425 5L300065
1d Contact buffer WHB 40x275 5L300064
1c Contact buffer WHB 40x175 5L300063
1b Contact buffer WHB 40x120 5L300062
1a Contact buffer WHB 40x80 5L300061
pos. pcs.* description norm mat. itm./drw. no. kg./pos.
*depending on the order

Blatt/sheet D550MGB.008
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
For all installation work in the shaft the following
must be observed:
Only persons trained for this purpose may
enter the installation zone or carry out
any work.
Preparation
The buffer is supplied ready for installation com-
plete with oil charge.
If the buffer is supplied with pressed-in piston
rod, the securing devices should be removed. Cut
the securing strips.
Warning! The extending piston rod can
cause injury!
The installation and attachment of the hydraulic
contact buffer takes place directly on shaft floor
or on a console.
EN 81 stipulates that a lower safety clea-
rance with a minimum height of 500mm
must remain when the contact buffer is
fully compressed (fig.1).
According to EN 81, a floor area free of
things built in must be retained around
the installation location.
This safety clearance is the size of a rec-
tangle with the minimum measurements
500 mm x 600mm x 1000 mm (fig. 2).
2 Installation
2.1 Installation of the hydraulic contact buffer
fig. 1
fig. 2

Blatt/sheet D550MGB.009
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
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THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
Installation
+Preassembled anchor rails are to be possi-
bly used.
Touch up the oil resistant coating after
drilling work is completed.
• Drive the car to a height of appx. 2m (fig. 1).
• Mark the resting point on the underside of the
car.
• Position the contact buffer/console underneath
this marking.
+Make sure that the location is level.
Use a water-level! Use shims, if necessary
• Plumb the contact buffer/console in the
middle (fig. 1) and then mark bore holes.
The attachment is carried out with bolt anchor,
heavy-load dowels or masonry bolts M 16 x 160
DIN 529 with nuts and washers 18 DIN 126.
+Consult a structural engineer if you have
any queries concerning fastening.
+Press-in the piston rod several times by
hand.
This permits transport-caused air bubbles to
escape from the hydraulic fluid. Subsequently, the
piston rod must be completely extended and the
oil level correct.
2.2 Electrical installation
Work on electrical equipment may be
carried out only by qualified electricians
or trained personnel. Disconnect all
installation components before beginning
work.
+When laying the connecting cable, make
sure that:
- single pole cables are double coated
- the utilization and laying of the cables is
in accordance with EMV.
• Carry out the electric connection to the limit
switch (13) (see fig. sheet 3)
During wiring the working range of the
linear slide (17) and the protection tube (10)
buffer stroke must be observed.
fig. 1
resting point

Blatt/sheet D550MGB.010
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
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THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
3 Commissioning / Functional testing
Quality and function of the individual compo-
nents is subject to strict inspection checks and
these are tested at the point of factory shipment.
+Before starting the functional testing
check the buffer fixing.
• Verify the total extended position of the piston
rod and the oil level before testing
Test run after installation
+Prior to the first test run:
Clean the guide rails!
No individuals are permitted to be in either
the shaft or the lift car during test runs.
Risk of crushing!!
Clear all objects from the shaft.
Screw projections and other dangerous
narrow points should be located and elimi-
nated in advance as much as possible.
A test drive with slow inspection speed through
the whole well has to be made for checking, that
there is enough space between car and the
passing components.
• Bridge the safety contact (lower overtravel)
• Carry out a first buffer test with reduced speed
and without additional load
+Verify the mechanical and electrical func-
tion of the limit switch.
• Wait for approximately 1-2 minutes and then
relieve the buffer
• Check the automatic return (buffer return) of
the contact buffer to ready position and check
the oil level (if necessary add more oil)
Check the buffer and the impact point for
possible damage and oil leaks.
If no defects are found, carry out a second
buffer test with rated speed and maximum load.
• Wait for approximately 1-2 minutes and then
relieve the buffer
• Verify the total extended position of the piston
rod and the oil level
If no defects are found, the buffer is ready for
operation.
After the functional testing, reactivate
the safety contact (lower overtravel).

Blatt/sheet D550MGB.011
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
4.1 Maintenance and checks
The hydraulic contact buffer is low-maintenance.
To guarantee safe installation operation, however,
inspection work must be carried out at regular
intervals, depending on frequency of use (at least
twice a year).
Alterations, damage or other irregularities are to
be reported, and rectified if possible. Frequent
maintenance and inspection checks do not only
improve operational safety, but also ensure long-
lasting and trouble free operation of the installa-
tion.
It is recommended that maintenance and inspec-
tion work be carried out and documented prior to
legally-mandated functional testing (before tech-
nical inspection institute checks, for example).
The lift installation must be taken out of
use without delay should any damage or
irregularities in the installation occur that
could possibly impair operational safety.
+Please contact WITTUR if you have any
problems or queries.
+Service work should be carried out ex-
pertly and with the utmost care in order
to guarantee safe installation operation.
4.2 Regular inspections
During regular inspections of the lift installation
or for trouble shooting the following verifications
are possible (see also chapter: “Review“).
4.2.1 Extended piston rod
Buffer with protection tube:
- The sight glass (9) is visible
- The limit switch (13) is not actuated
Buffer with linear slide:
- The visible part of the piston rod is as long as
its stroke (see indication on the name plate
- The limit switch (13) is not actuated
4.2.2 Oil level
+Observe the oil level with fully extended
piston rod. The oil level should be visible in
the sight glass (9).
WHB 50 with 2 sight glasses (above maxi-
mum, below minimum) arranged on top of
each other.
Too high oil level:
• Press in the piston rod several times as far as
possible (air bubbles)
If the oil level is not falling:
• Remove oil (see chapter: “Correction of the oil
level“)
Too low oil level:
• Add oil (see chapter: “Correction of the oil le-
vel“)
+Check the buffer for leakage!
4 Maintenance, checks and repairs
Minimum Maximum

Blatt/sheet D550MGB.012
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
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THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
4.2.3 Gas pressure
• Press the piston rod by hand for some centi-
metres
The piston rod returns automatically to its initial
position. Otherwise refill gas (see chapter: “Gas
refilling“).
4.2.4 General visual inspection
• Pay attention to oil spots on the floor or on
the buffer
An oil film on the piston rod surface is normal.
• Check the piston rod surface for damage and
tightly adherent contaminations
• Check the state and function of the limit
switch
If leaks or damage is found, the buffer
must be exchanged or repaired.
4.3 Maintenance
Under normal operating conditions the contact
buffer does not require maintenance. However, if
during the regular inspections defects are detec-
ted, these can be removed as described in the fol-
lowing (see also chapter: “Review“).
Every time, safety measures must be taken
against unintentional setting in motion of
the elevator!
4.3.1 Removing the protection tube
For buffers with a protection tube this should be
removed for maintenance work.
• Remove the three hexagon screws (12)
• Push the protection tube (10) downward into
the service position “X“
As the same time the limit switch (13) is actuated.
betätigt. Now the oil filling screw (14) and the
gas filling valve (15) are accessible.
After termination of the maintenance work the
protection tube is mounted in reverse order.
Warning! The buffer is pressurised.
Prior to opening the buffer and for oil re-
filling the pressure must be released!
4.3.2 Relieving gas pressure
• Remove the set screw M 5 from the gas filling
valve (15) in order to uncover the valve
opening
• Place the nitrogen filling device on the filling
valve and let the gas escape or
• Press in the valve cone with a pointed object
and let the gas escape or
• Unscrew the oil filling screw (14) by one or
two turns until the gas has escaped
4.3.3 Correction of the oil level
• Relieve the gas pressure
• Remove the oil filling screw (14)
+Observe absolutely the limit values of the
oil level. The correct oil level is only indi-
cated if the piston rod is fully extended.
Too high oil level:
There is a danger that the buffer becomes over-
loaded during buffer stroke, therefore
• Remove oil
Too low oil level:
The damping effect of the buffer may be reduced.
• Refill hydraulic oil of the type HLP ISO VG 46
DIN 51524, until the oil level is in the centre of
the sight glass

Blatt/sheet D550MGB.013
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
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THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
• Close the oil filler-hole
Use a a new copper sealing ring A 14 x18
DIN 7603.
• Refill gas
+If an inspection book is kept for the eleva-
tor buffer, the oil level corrections should
be noticed here.
4.3.4 Gas refilling
• Remove the set screw M 5 from the gas filling
valve (15)
Never fill with oxygen or other in-
flammable gases such as propane and
acetylene!
The use of compressed air instead of
nitrogen is permissible.
• Place a nitrogen filling device on the filling
valve
• Fill in the gas with filling pressure 5 bar
The filling pressure of 5 bar must not be
exceeded!
The piston rod should now be fully exten-
ded.
• Close the valve with set screw M 5
• Finally check the gas filling valve (15) and the
oil filling screw (14) with a leak-detecting
spray or soap water for gas tightness
4.4 Ordering spare parts
For ordering spare parts, please contact WITTUR.
The following buffer-specific data are always re-
quired:
- Buffer type
- Serial number
- Article number
- Maximum and minimum impact mass
- Rated speed

Blatt/sheet D550MGB.014
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
Buffer stroke: ·Release buffer and wait for signalling of the 4.2.4
piston rod reset [limit switch (13)]
>Make an visual inspection of the buffer
Oil leakage: - strong ·If the leak cannot be stopped, change the buffer
immediately
+Leaked oil must be absorbed using oil
binder or cleaning rags.
- small ·Check oil level,if necessary refill oil; 4.2.2
>Buffer must be checked at shorter intervals 4.3.3
otherwise exchange the buffer
Oil level: - too low ·Ckeck the buffer for leakages, if necessary 4.2.2
refill oil, otherwise like
- too high ·Press in the piston rod several times as far as 4.2.2
possible, otherwise remove oil
Piston rod: - not fully extend ·Refill nitrogen 4.2.3
>Check the entire buffer with leak detecting spray 4.3.4
or soap water for possible gas leakage; if the
the problem still exists, the buffer should be
exchanged or repaired by skilled personnel
- damaged ·Buffer has to be exchanged or repaired by skilled
personnel
4.5 Measures during operation
Occurrence Action Chapter
1
3
2
2
4
4.6 Carrying out repairs
As a general rule, damage to and/or war-
ping of the buffer may not be repaired
and/or straightened out under any cir-
cumstances. The damaged components are
to be replaced. Use only WITTUR spare
parts when doing so.
+Repairs should be carried out expertly and
with the utmost care in order to guaran-
tee safe installation operation.
Observe the safety measures for work per-
formed on elevator installations when
performing repair work.

Blatt/sheet D550MGB.015
Datum/date 14.05.2001
Stand/version 14.05.2001
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
Typ / type WHB 40x80 WHB 40x120 WHB 40x175 WHB 40x275
max. Nenngeschwindigkeit v (m/s) 1,0 1,3 1,6 2,0
max. rated speed
Aufprallmasse min. - max. (kg) 450 - 3000 450 - 3000 450 - 3000 450 - 3000
impact mass
Hub s(mm) 80 120 175 275
stroke
Gewicht betriebsbereit (kg) 14 16 19 24
weight with oil filling
Ölschauglas
oil level pane
5 Specifications
5.1 WHB 40 Contact buffer
Abmessungen
Dimensions
Typ / type SLNABCDEFGP
WHB40x80 80 305 225
WHB40x120 120 385 265 160 120 20 18 112 115 140 80
WHB40x175 175 495 320
WHB40x275 275 715 440
Zulässige Umgebungstemperaturen für
Standardausführung: +5 °C bis +50 °C
Andere Temperaturbereiche auf Anfrage.
Permissible ambient temperatures for
standard design: +5 °C up to +50 °C
Other temperatures on request.
Alle Maße in mm / all dimensions in mm

Blatt/sheet D550MGB.016
Datum/date 14.05.2001
Stand/version 25.01.2003
Geprüft/approved BRA/AD
Änderungen vorbehalten! Subject to change without notice!
THE LMC LIFTCOMPONENTS MANUFACTURING AND COMMERCE COMPANY
Hydraulic contact buffer
Operating instructions
Typ / type WHB 50x425 WHB 50x695
max. Nenngeschwindigkeit v (m/s) 2,5 3,2
max. rated speed
Aufprallmasse min. - max. (kg) 500 - 4500 600 - 4500
impact mass
Hub s(mm) 425 695
stroke
Gewicht betriebsbereit (kg) 47 68
weight with oil filling
Zulässige Umgebungstemperaturen für
Standardausführung: +5 °C bis +50 °C
Andere Temperaturbereiche auf Anfrage.
Permissible ambient temperatures for
standard design: +5 °C up to +50 °C
Other temperatures on request. Ölschaugläser
oil level panes
5.2 WHB 50 Contact buffer
Alle Maße in mm / all dimensions in mm
Abmessungen
Dimensions
Typ / type SLNABCDEFGP
WHB50x425 425 1065 640
WHB50x695 695 1685 970 200 160 20 18 135 155 150 100