Netti GMDN 41620 User manual

GMDN 41620
4U Base
UM0100 UK 2022-03
This product conforms to MDR regulation
(EU) 2017/745 for medical products.
User Manual

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Model: Netti 4U BASE
Language: English Version: 2022-03
CONTENTS
1. INTRODUCTION 4
1.1 AREAS OF USE / INDICATIONS FOR NETTI 4U BASE 5
1.2 CONTRAINDICATIONS 5
1.3 QUALITY AND DURABILITY 5
1.4 THE ENVIRONMENT AND WASTE DISPOSAL 6
1.5 INFORMATION FOR REUSE 6
1.6 ABOUT THIS MANUAL 7
1.7 VITAL MEASURES 7
2. QUICK REFERENCE 9
3. DESCRIPTION 10
4. FEATURES OF NETTI 4U BASE 11
5. ACCESSORIES 12
5.1 ASSEMBLING OF HIP BELT 14
6. ASSEMBLING AND ADJUSTMENT 14
6.1 UNPACKING 14
6.2 MAIN WHEEL 15
6.3 FRONT CASTORS 15
6.4 SEAT HEIGHT ADJUSTMENT 16
6.5 BACKREST 17
6.6 SEAT DEPTH ADJUSTMENT AT THE REAR 18
6.7 SEAT DEPTH ADJUSTMENT IN FRONT 18
6.8 ANTITIPS 19
6.9 MOULDED SEAT AND SEAT CUSHION 19
6.10 BACK REST CUSHION 20
6.11 LEG SUPPORTS 20
6.12 HEAD SUPPORT 23
6.13 ARM SUPPORT 25
6.14 ADJUSTING THE PARKING BRAKES 26

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7. SEAT ANGLE / TILT AND BACK ANGLE / RECLINE 28
7.1 SEAT ANGLE 28
7.2 BACKREST ANGLE 28
7.3 KEY WORDS REGARDING TILT AND RECLINE 29
7.4 DECREASE THE POSSIBILITY OF SLIDING, SHEAR AND PRESSURE SORES 29
7.5 OPERATING TILT HANDLE: TILTING THE SEATING UNIT 30
7.6 OPERATING RECLINE HANDLE: RECLINING THE BACK 31
8. MANOEUVRING 32
8.1 GENERAL TECHNIQUES 32
8.2 DRIVING TECHNIQUES  STEP UP  32
8.3 DRIVING TECHNIQUES  STEP DOWN  33
8.4 DRIVING TECHNIQUES  SLOPE  33
8.5 DRIVING TECHNIQUES  UP STAIRS  34
8.6 DRIVING TECHNIQUES  DOWN STAIRS  34
8.7 TRANSFER 35
8.8 LIFTING THE WHEELCHAIR 36
8.9 PUSH RIM 36
9. TRANSPORT 36
9.1 TRANSPORT IN CAR 37
9.2 FOLDING FOR TRANSPORT 38
9.3 TRANSPORT IN AIRPLANE 38
9.4 TRAVELLING ON PUBLIC TRANSPORT 39
10. MAINTENANCE 40
10.1 MAINTENANCE INSTRUCTIONS 40
10.2 CLEANING AND WASHING 40
10.3 LONG TERM STORING 41
11. TROUBLESHOOTING 42
12. TESTS & WARRANTY 43
12.1 TESTS 43
12.2 WARRANTY 43
12.3 CLAIM 43
12.4 NETTI CUSTOMIZED / INDIVIDUAL ADAPTATIONS 44
12.5 COMBINATIONS WITH OTHER PRODUCTS 44
12.6 SERVICE AND REPAIR 44
13. MEASUREMENTS & WEIGHT 45

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1. INTRODUCTION
Netti 4U Base is a wheelchair chassis meant to
function as a base for external seating systems
and modular seats, as well as for the Netti Seating
System.
Netti 4U BASE with Netti Seating System has
been tested to DIN EN 12183:2014. The tests were
carried out by TÜV SÜD Product Service GmbH in
Germany.
In Alu Rehab we believe that wheelchairs should
be chosen based on a thorough assessment
focusing on the needs of the user and demands
from the environment. Therefore it is important to
know about the possibilities and restrictions of the
wheelchair.
The wheelchair is constructed for indoor and
outdoor use, and oers the possibility to vary the
sitting position from activity to rest using tilt and
recline functions.
MAX USER WEIGHT: 135 KG.
When mounting accessories such as power
kit, external seating systems etc., the weight
of the accessories must be subtracted from
the max user weight.
Specications varies between countries.

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1.1 AREAS OF USE / INDICATIONS FOR
NETTI 4U BASE
Netti 4U Base is a comfort wheelchair chassis, to be
used in combination with external modular seats
and seating systems, alternatively with solutions
from Netti Seating System – for youngsters and
grown up persons with limited mobility. The
seating system is chosen based on the needs of
the user, and the Netti 4U Base will provide added
stability through a wide range of leg supports, arm
supports and head supports. In addition, the Netti
4U Base provides unique tilt and recline functions
in combination with very good manoeuvring
properties.
1.2 CONTRAINDICATIONS
Netti 4U BASE is not suited for persons with a
strongly enhanced muscular spasticity. In this case
we recommend the Netti Dynamic System which
oers a construction that follows the movement
pattern of the user.
Ignoring this advice could in unfavourable
circumstances lead to the deformation or fracture
of metal parts in the area of the back tube, the leg
supports or the arm supports.
1.3 QUALITY AND DURABILITY
The Netti 4U Base wheelchair is tested at TÜV SÜD
Product Service GmbH in Germany, following the
European Standard DIN EN 12183:2014.
As manufacturer, Alu Rehab A.S evaluates the test to
be equal to 5 – 6 years of normal use of the chair.
The disability of the user, the toughness of use as
well as the level of maintenance done, foremost
decides the durability of the wheelchair. Thus, the
durability will vary depending on these three factors.

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1.5 INFORMATION FOR REUSE
All products from Alu Rehab are designed to give
years of maintenance-free service. All products can
be adapted for re-use by an authorized dealer. In
order to guarantee performance and safety, Alu
Rehab recommends the following tests prior to any
re-use.
Please examine the following components for
function, integrity etc. and replace parts as
necessary:
• Wheels (tyre tread)
• Wheelchair frame
• Front castors and quick release
• Hubs
• Brake function
• Directional stability of wheels
• Bearings: test for wear and lubrication
• Cushions
• Leg supports
• Arm supports
• Recline / tilt function
• Push bar / handles
• Anti-tip
Please also note the content of chapter 10.2
Cleaning and washing instructions.
For hygienic reasons: please replace the head
support for a new user.
ANTITIP
Correctly tted, the anti-tip will secure the chair from
tipping backwards. We strongly recommend use of
the anti-tips.
A refurbishment manual for Netti
Wheelchairs can be downloaded at
My-Netti.com
A recycling manual for Netti
Wheelchairs can be downloaded at
My-Netti.com
Latest user manual updates, product safety notes,
addresses and other product information like
recalls etc. will be published on our web page.
1.4 THE ENVIRONMENT AND WASTE
DISPOSAL
Alu Rehab and its suppliers wish to protect the
environment.
This means:
• That we avoid using environmentally harmful
substances and processes to the greatest extent
possible.
• That Alu Rehab’s products are ensured a long
service life and a high degree of exibility – to
benet the environment and economy.
• That all packaging can be recycled.
• That the wheelchair was designed to be separated
into its component materials – to make recycling
easier.
Contact your local recycling agent to get
correct information how to handle in you
area.
Netti 4U BASE is designed for temperature
range from –10°C to +40°C.

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1.6 ABOUT THIS MANUAL
In order to avoid damages while using the Netti 4U
Base wheelchair, please read this manual carefully
before starting to use the chair.
Symbol of forbidden actions.
No warranty can be claimed
whenever these actions are
implemented.
Symbol of warning.
Whenever this symbol is used,
caution has to be taken.
Symbol for important information.
Symbol for useful tips.
Symbol for tools.
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°Symbol for parking brake safe slope.
Max.
135 kg
Symbol for max user weight.
Symbol for medical device
Manufacturer: name + address
Date of manufacturing
Product serial number
Read Instruction
Please note that this manual is updated according
to the year and date stated on each page.
User Manual on web www.my-netti.com
For enhanced readability (advantageous for users
with visibility challenges) please nd our user
manual on our web page:
www.My-Netti.com – manuals –
user manual Netti 4U BASE.
1.7 VITAL MEASURES
Netti 4U Base is a chassis designed for both outdoor
and indoor use.
Specications varies between countries.
TOTAL WEIGHT: 29,5 KG
(500 mm width chair)
SEAT WIDTH:
350, 400, 450, 500 mm
SEAT DEPTH:
(From back rest cushion
to front of seat plate)
425, 450, 475, 500 mm
SEAT HEIGHT:
(From oor to top seat plate
using 24”main wheels in
upper hole position)
465 mm*
* By changing position of main wheels,
it is possible to achieve seat height of 500 mm.
BACKREST HEIGHT:
500 mm
When Netti seating
system is installed.

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Specication min. max.
Overall length with leg support - 24” wheels
* 16”wheels
1130 mm
*1110 mm –
Overall length without leg support - 24” wheels
* 16”wheels
930 mm
*880 mm –
Overall width 530 mm 680 mm
Height without head rest 1150 mm
Folded length
Folded width ex wheels
Folded height ex wheels
Total mass 29,5 kg –
Mass heaviest part-frame 18,0 kg –
Static stability uphill –0° 28°
Seat plane angle –5° 20°
Eective seat depth 425 mm *500 mm
Eective seat width 350 mm 500 mm
Seat surface height at front 465 mm 500 mm
Backrest angle 92º 137º
Backrest height – with Netti Seating System 500 mm 500 mm
Foot plate to seat distance 280 mm 560 mm
Leg to seat surface angle 105º 182º
Arm support to seat distance 260 mm 355 mm
Front location of arm support structure 320 mm 460 mm
Push rim diameter 535 mm 535 mm
Horizontal axle location -50 mm 25 mm
Parking brake safe slope 0 7º
Minimum turning radius 860 mm –
Model with 24” main wheels.
Measured without cushions.

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Drive carefully!
Be aware that friction against push-rims can
create a warm surface.
Surface temperature of metal parts in frame
structure might increase when exposed to
direct sunlight.
Salt water can increase risk of corrosion.
Further precautions related to environmental
conditions not needed.
The anti-tips should always be used for the
safety of the user.
When the chair is tilted rearwards, the
anti-tips and brakes must always be in use.
Be sure to lock all handles properly.
Watch out for pinching danger when folding
and unfolding, tilting, reclining and all other
adjustment movements.
Charge the battery daily.
If the chair has pneumatic tires: Make sure to
check tyre pressure every week and inate to
keep 35 psi / 2,4 bar.
Never stand on the foot plates due to risk of
tipping forwards.
Never lift the wheelchair by the leg supports,
arm supports or head support.
Illustrations may dier from the
delivered product.
If in doubt – contact your dealer!
2. QUICK REFERENCE
The content of this page is a summary of the whole
manual. It gives you a brief introduction to the use
and care of the Netti 4U Base wheelchair.
The quick reference is not a replacement
for the manual, only reminder / check list.
• Unpack the wheelchair (Chapter 6.1).
• Mount the main wheels (Chapter 6.2).
• Mount the front castors (Chapter 6.3).
• Put the back rest back, and mount the recline
as strut to the back rest using the locking bolt.
(Chapter 6.5).
• Mount the leg supports (Chapter 6.11).
• Mount the head support (Chapter 6.12).
• Set anti-tip in active position (Chapter 6.6).
• Mount accessory (See chapter 5 for more
information. Mounting descriptions will
accompany the accessory.).
ADJUST THE WHEELCHAIR TO THE USER:
Adjust seat depth and eventually the wheelchair
balance, leg support height, arm support height,
head support height and depth.
Netti 4U BASE is as a standard delivered without
cushions. It must NEVER be used without cushions.
Please install seating system and adjust it for the
user.
For more information about adapting the wheelchair
to the user please see:
www.My-Netti.com knowledge centre.
Announcements to product safety and
eventually product recalls will be published
on our home page www.My-Netti.com.
For troubleshooting, see chapter 11.
For mounting and adjustments see
chapter 6.
For visually impaired people, manuals and
catalogues can be downloaded at
www.My-Netti.com.

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3. DESCRIPTION
Standard version*
1. Push bow
2. Head support
3. Angle and depth adjustment
for head support
4. Release handles tilt/recline
5 Head support bracket
6. Arm support with pad
7. Seat plate
8. Angle adjustable leg support
9. Calf support bracket
10. Foot board
11. Calf support
12. Front castors
13. Front fork
14. Main wheel
15. Anti-tip
16. Brake handle
If any of these parts are missing,
please contact your dealer.
Product conguration may vary
between dierent countries.
Some markets add backrest Velcro
and seating system as standard.

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STANDARD
SEAT
• Standard without seat cushion
• Tilt –5° to +20°
• Seat depth 425 – 500 mm
WHEELS
• 16 x 1 3/4”drum brake puncture proof
main wheels
• 7”Puncture proof front castors with quick
release axle
Standard main wheels may vary between countries.
BACKREST
• Angle: 92° to 137°
• Push bow
LEG SUPPORT
• Angle adjustable leg support
• Height and angle adjustable foot plates
• Removable
ARM SUPPORT
• Height and depth adjustable
• Revolvable
HEAD SUPPORT
• To be ordered separately
4. FEATURES OF NETTI 4U BASE
ACCESSORIES
SEAT
• Pressure distributive cushions
• Hip belts (See chapter 5)
WHEELS
• Puncture proof PU wheels 12”x1 3/4”, 16”x1 3/4”
and 24x1 3/8”with drum brake (See chapter 5)
• 24x1”standard puncture proof main wheels
• Push rim: Aluminium on 24”wheels
• 7”x 145 mm Puncture proof Flexel front castors
with quick release axle
BACKREST
• Backrest Velcro*
• Dierent backrest cushions
• Lumbar support and wedge (See chapter 5)
• Angle adjustable push bow
LEG SUPPORT
• Universal or Angle adjustable leg support
• Height and angle adjustable foot plates
or foot board
• Removable
ARM SUPPORT
• Hemi cushions (See chapter 5)
HEAD SUPPORT
• Dierent head support models (See chapter 5)

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SIDE SUPPORT
CORRECTION.
Meant for correction of bad
postures in the upper trunk.
PAD
For side support
SIDE SUPPORT STABLE
Meant for users with
decreased stability of the
upper trunk. For optimal
function use together with
Stable cushion.
PAD
For side support Stable
SEAT
SEAT CUSHIONS
Many to choose from.
Please contact your dealer.
PELVIC STABILIZER
ABDUCTION BLOCK
The block reduces abduction.
Small: 80 mm width
Medium: 110 mm width
Large: 140 mm width
BELTS AND HARNESSES
Several models: Hip belts
with or without upholstery
and with plastic lock or
car lock (Chapter 5.1 for
mounting).
5. ACCESSORIES
The anytime updated complete accessory
and spare part catalogue can be downloaded
from our home page www.My-Netti.com
order forms, Netti 4U BASE.
FRAME
ANTITIP
With tramp pedal.
FRAME EXTENDER
Increases distance
between main wheels
and front castors.
Reduces tipping risk.
EYE BOLT SET
For xing wheelchair in a car.
BACK
BACKREST VELCRO
Adjustable Velcro back.
BACKREST CUSHIONS
Several models.
Please contact your dealer.
WEDGE
Increases side support.
LUMBAR SUPPORT
Increases lumbar curvature.

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UPHOLSTERY FOR
CALF SUPPORT BRACKET
Reduces pressure.
CALF PAD HINGED
The user does not have to
lift the leg when mounting
or dismounting the foot
supports.
FOOT BOARD WITH LOCK
The foot support can be
swung to the side like
standard foot supports.
WHEELS
MAIN WHEELS
12”, 16” and 24” with drum
brake
FRONT CASTORS
6”and 7”– 175 x 45 Flexel
SPOKE PROTECTORS
For 20”, 22”and 24”.
Transparent
TRAYS etc.
2 tray models:
Swingable and lockable
UPHOLSTERY FOR TRAY
Oers a soft base for the arm
resting on the tray.
TOOL SET
HEAD SUPPORTS
Support C – Large.
Support A – Side support
Support B – Small
Support D – Pressure
distribution
Support E – Side support
adjustable
Support F – With cheek
support
HYGIENE COVER
Protects the core of the
head support.
HEAD CUSHION COMFORT
Cushion with Kospoex
lling to pull onto head rest.
ARM SUPPORT
HEMI ARM SUPPORT
An accommodating support
for hemiplegic users.
LEG SUPPORT
ANGLE ADJUSTABLE
UNIVERSAL
Adjustable in xed positions
between 33° to 105° using an
adjustment wheel.
FOOT BOARD UPHOLSTERY
ANKLE HUGGERS

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6. ASSEMBLING AND
ADJUSTMENT
For information about adapting the
wheelchair to the user, please see:
My-Netti.com Knowledge center.
6.1 UNPACKING
1. Unpack all the parts, and check that
everything is there according to the
packing list.
2. Mount the main wheels (Chapter 6.2).
3. Mount the front castors (Chapter 6.3).
4. Check and adjust the seat depth (Chap. 6.7).
5. Mount the back rest (Chapter 6.5).
6. Mount the seat cushion (Chapter 6.9).
7. Mount the leg supports (Chapter 6.10).
8. Mount the head support (Chapter 6.11).
9. Mount any accessories (Chapter 5).
Weight of components (450 mm chair width):
Main wheels: 1,9 kg each
Anti-tip: 0,1 kg each
Front castors: 0,8 kg each
Leg support angle adj.: 2 kg each
Netti Seat cushion: App. 1,0 kg
Head support A: 1,0 kg
Head support C: 0,9 kg
5.1 ASSEMBLING OF HIP BELT
• Pull the belt through the hole in the
hip belt bracket.
• Thread the belt back through the belt clamp.
• Fix the hip belt bracket to the back rest hinge
in the rearmost hole, using the enclosed screws
and nut.
2 pc 13 mm open-end spanner.

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6.3 FRONT CASTORS
Are equipped with quick release axle.
To take o:
• Press the release button on top of the front fork
bearing house – located under the silicon cap.
To mount:
• Lead the quick release axle into the bearing
house. Pull the fork slightly to ensure that the
fork is fully locked.
6.2 MAIN WHEEL
Netti 4U BASE is delivered with 16”main wheel with
drum brake installed from your dealer.
To mount a 24” main wheel, the hub bushing must
be moved to correct hole in the main wheel bracket.
Then the quick release bolt is inserted through the
centre of the main wheel and into the hub bushing
while pressing the knob in centre.
12”& 16”main wheels with drum brake. are installed
by your dealer.
To check that the 24” main wheel is properly
attached to the hub, remove the nger from
the central knob and pull at the main wheel.
If the main wheel doesn’t lock, do not use the
wheelchair but contact your dealer.
Sand and sea water (salt used for gritting in
the winter) can damage the bearings of the
main wheels and front castors. Clean the
wheelchair thoroughly after exposure.

16
24" main
wheel
24"
main
wheel
16"
main
wheel
12" main wheel
24", 16" and
12" main wheel
24" main wheel
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Main wheels and front castors should be mounted
according to the positions described below.
When the seat height is changed ensure that
the front castors are placed so that the lower
frame tube is parallel with the ground.
Check the position of the anti-tip and
readjustthe brakes after mounting the main
wheels or changing the main wheel position.
24” main wheel
24”,16”and
12” main wheel
16”
12”main wheel
24”main wheel
6.4 SEAT HEIGHT ADJUSTMENT
The seat height at the rear depends on:
• Size of main wheel.
• Position of main wheel.
• Using 24”main wheels in the upper hole, the seat
height is 46.5 cm from the oor to the seating
plate. Using 24”main wheels in the next lower
position, the height will measure 500 mm to the
seating plate.
• Using 22”main wheels in the upper hole, the
seat height is 44 cm from the oor to the seating
plate. Using 22”main wheels in the next lower
position, the height will measure 475 mm to the
seating plate.
If it is required to change position of the main
wheels or to change to a dierent size of main
wheels, unx the hub bushing including washer and
nut. Remove the hub bushing and mount it in the
required position.
2 pc 24 mm open-end spanners.
Make sure that the nut on inside of frame
totally wreathes the wheel bushing.

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• The wheelchair is set to a standard seat depth,
and the plastic bracket has 4 holes of which three
are temporarily blocked with plastic plugs
• The back rest hinge has 4 holes. The hole
positions are in accordance with the holes in
the plastic bracket. If the locking head of the
gas spring is mounted in the inner hole of the
plastic bracket, the back rest hinge should also be
mounted in the inner hole etc.
• Find the required position for the locking head in
the plastic bracket, and remove the plastic plug
from this hole.
• Lock the back rest by pushing the locking bolt
through the plastic bracket and the gas spring
locking head.
• After changing the hole position in the plastic
bracket, the hole position in the back rest hinge
must be changed into the parallell position.
Check that the hole in the back rest hinge
and the plastic bracket are mounted into the
same hole position.
6 mm Allen-key.
6.5 BACKREST
• To mount the gas spring, lift the push bow with
one hand, and lead the gas spring locking head
into the plastic bracket with the other.
• If the gas spring seems to be too long it must be
compressed. Press the horizontal lower back tube
towards the end of the gas spring while you pull
the handle for the back recline. The gas spring will
be compressed and t into the plastic bracket.
• Check that the hole in the locking head is parallell
with the open holes in the plastic bracket.
• Lock the backrest by pushing the locking bolt
through the plastic bracket and gas spring
locking head
To check that the back rest is locked, grip
the push bow and press the back rest
forward.
If the back rest falls forward – repeat the
locking procedure or contact your local
dealer.

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6.7 SEAT DEPTH ADJUSTMENT
IN FRONT
It is possible to adjust the seat depth with up to
100 mm in front to get the knee pivot point aligned
with leg support pivot point. Do the following.
• Screw out the screws in the adjustment piece.
• Place the adjustment piece in the wanted
position.
• Replace and tighten the screws.
6 mm Allen-key.
If the user has spastic tendencies the
adjustment piece should not be pulled out
more than 50 mm.
6.6 SEAT DEPTH ADJUSTMENT
AT THE REAR
• If the seat depth should be adjusted at the rear,
release the locking bolt from the plastic bracket.
• Find the required position for the locking head in
the plastic bracket, and remove the plastic plug
from this hole.
• Lock the back rest by pushing the locking bolt
through the plastic bracket and the gas spring
locking head.
• After changing the hole position in the plastic
bracket, the hole position in the back rest hinge
must be changed into the parallel position.
Check that the hole in the back rest hinge
and the plastic bracket are mounted in
parallel position.
6 mm Allen-key.

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6.9 MOULDED SEAT AND
SEAT CUSHION
The moulded seat is to be xed to the plywood seat
plate by screws with regular nuts or claw nuts. Then
the seat plate must be xed to the chair frame.
The seat cushion is xed on the wheelchair with
Velcro.
It is very important to place the cushion in
the wheelchair before use.
The cushion cover is washable and reusable.
6.8 ANTITIPS
The anti-tips should be mounted according to the
mounting description which is enclosed with the
chair upon arrival.
• Use of the anti-tip.
• Pull the anti-tip out.
• Turn it up or down 180°.
• Lock it in position.
ADJUSTING THE HEIGHT OF THE ANTITIPS
The anti-tip can be adjusted in two xed positions.
The short position is for 12”& 16”main wheels and
24”in upper position. The long position is for 24”
main wheels in lower position.
• Unx the screw in the adjustable extension piece
as shown in picture below.
• This extension piece has two holes. Place it in the
required position and tighten the screw.
5 mm Allen-key.
The anti-tip should always be used for the
safety of the user.

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6.11 LEG SUPPORTS
Netti 4U Base is delivered with manual Angle
Adjustable leg support.
Universal leg support can be ordered instead,
shown to the right.
MOUNTING OF LEG SUPPORT
• Mount the leg support by holding onto
the hinge point of the leg support.
Hold it in an angle of app. 20° to the side frame. Put
it into the leg support black plastic lock. Swing it in
and push down.
6.10 BACK REST CUSHION*
The back rest cushion is attached to the back rest
with the Velcro that can be ordered as an accessory.
* Some markets use Netti Seating System as
standard on Netti 4U Base.
The seat and back rest cushion covers are
washable and thereby reusable. Follow the
instruction on the cushions for correct
maintenance and washing of the cushions.