KUHN GA4121GM User manual

Original instructions
KN129DGB D
Read carefully before starting the machine
OPERATOR'S MANUAL
Gyrorake
D0001 > D9999
GA4121GM
KN129DGB D
- English - 04-2018
*KN129DGB_D*

1. - Dear Owner
GA4121GM
1
KN129DGB D
Gyrorake
1. Dear Owner
In buying a Kuhn machine you have chosen wisely. Into it have gone years of thought, research and
improvement. You will find, as have thousands of owners all over the world, that you have the best that
engineering skill and actual field testing can produce. You have purchased a dependable machine, but only
through proper care and operation can you expect to receive the performance and long service built into it.
This manual contains all the necessary information for you to receive full efficiency from your machine. The
performance you get from this machine is largely dependent on how well you read and understand this
manual and apply this knowledge. Please DO NOT ASSUME YOU KNOW HOW TO OPERATE AND
MAINTAIN YOUR MACHINE before reading this manual carefully. KEEP THIS MANUAL AVAILABLE FOR
REFERENCE. Pass it on to the next owner if you re-sell the machine.
Your KUHN dealer can offer a complete line of genuine KUHN service parts. These parts are manufactured
and carefully inspected in the same factory that builds the machine to assure high quality and accurate
fitting of any necessary replacements.
About improvements
We are continually striving to improve our products. We therefore reserve the right to make improvements
or changes when it becomes practical to do so, without incurring any obligations to make changes or
additions to the equipment sold previously.
Wear parts
Wearing parts fitted on our machines have been tested in very different situations to optimize their service
life. Nevertheless, the service life depends highly on theconditions of use (products to handle, soil, weather
conditions, etc...).
Designated use of the machine
The GA4121GM Gyrorake must only be used for the work for which it has been designed: raking on the
ground and forming windrows of pre-mowed fodder and straw.
Document illustrations
The illustrations in this manual may be based on one type of machine only. However, all instructions apply
to all machines covered in this manual.
Copyright 2018 KUHN

GA4121GM
22. - Contents
KN129DGB D
Gyrorake
2. Contents
1. Dear Owner .....................................................................................................................1
2. Contents..........................................................................................................................2
3. Identification of the machine.........................................................................................5
3.1 Front view ........................................................................................................................................ 5
3.2 Rear view......................................................................................................................................... 5
3.3 Model identification plate .................................................................................................................6
3.4 Optional equipment.......................................................................................................................... 7
4. Safety...............................................................................................................................8
4.1 Description of symbols used in this document.................................................................................8
4.2 Safety instructions ...........................................................................................................................9
4.2.1 Introduction......................................................................................................................... 9
4.2.2 Read and follow the safety instructions..............................................................................9
4.2.3 Precautions to be taken before carrying out any operations on the machine..................... 9
4.2.4 Precautions to take before using the machine ................................................................. 10
4.2.5 Precautions when driving .................................................................................................10
4.2.6 Precautions when driving on public roads.........................................................................11
4.2.7 PTO shaft.......................................................................................................................... 15
4.2.8 Precautions during manoeuvres....................................................................................... 17
4.2.9 Remote controlled components........................................................................................ 17
4.2.10 Tyres.................................................................................................................................17
4.2.11 Safety decals.................................................................................................................... 17
4.2.12 Waste disposal .................................................................................................................18
4.2.13 Precautions for maintenance and repair work.................................................................. 18
4.2.14 Projection of stones and foreign objects........................................................................... 19
4.2.15 Precautions for machine use............................................................................................ 19
4.3 Location and description of safety decals on the machine ............................................................ 20
4.3.1 Location of safety decals..................................................................................................20
4.3.2 Description of safety decals.............................................................................................. 21
5. Machine specifications................................................................................................23
5.1 Description and glossary ............................................................................................................... 23
5.2 Technical specifications ................................................................................................................. 24
5.3 Required equipment ......................................................................................................................25
5.3.1 Primary PTO shaft............................................................................................................25
5.4 Sound levels ..................................................................................................................................25

2. - Contents
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-
6. Putting into service...................................................................................................... 26
6.1 Coupling and uncoupling............................................................................................................... 26
6.1.1 Description of coupling elements ..................................................................................... 26
6.1.2 Preparing the tractor......................................................................................................... 26
6.1.3 Coupling the machine.......................................................................................................28
6.1.4 Primary PTO shaft............................................................................................................ 30
6.1.5 Hydraulic connections......................................................................................................31
6.1.6 Electrical connections....................................................................................................... 32
6.1.7 Uncoupling the machine................................................................................................... 32
7. Instructions for transport............................................................................................ 34
7.1 Putting the machine into transport position ................................................................................... 34
7.2 Conformity with the road regulations............................................................................................. 38
8. Instructions for work................................................................................................... 39
8.1 Putting the machine into work position.......................................................................................... 39
8.2 Adjustments in working position .................................................................................................... 41
8.2.1 Wheel height adjustment.................................................................................................. 41
8.2.2 Swath screen adjustment................................................................................................. 43
8.3 Machine use .................................................................................................................................. 46
8.3.1 Drive speed...................................................................................................................... 46
9. Optional equipment..................................................................................................... 47
9.1 1 3/8 - 6 spline pto shaft ................................................................................................................ 47
9.2 1 3/8 - 6 spline wide angle u-joint drive ......................................................................................... 47
9.3 Front support wheel....................................................................................................................... 47
9.3.1 Fitting................................................................................................................................ 48
9.3.2 Adjustments...................................................................................................................... 48
9.4 Bogie axles.................................................................................................................................... 50
9.4.1 Fitting................................................................................................................................ 50
9.4.2 Machine use..................................................................................................................... 51
9.4.3 Lubrication........................................................................................................................ 52
9.5 Three point frame damper............................................................................................................. 52
9.5.1 Fitting................................................................................................................................ 52
9.6 Hydraulic windrow curtain.............................................................................................................. 53
9.6.1 Preparing the tractor......................................................................................................... 53
9.6.2 Hydraulic connections......................................................................................................53
9.6.3 Putting the machine into transport position...................................................................... 53
9.6.4 Putting the machine into work position............................................................................. 56
9.6.5 Adjustments...................................................................................................................... 57
9.6.6 Maintenance..................................................................................................................... 59
9.6.7 Storage............................................................................................................................. 59

GA4121GM
42. - Contents
KN129DGB D
Gyrorake
-9.7 Lateral signalling equipment..........................................................................................................60
9.8 Europe signalling equipment .........................................................................................................60
9.8.2 Fitting................................................................................................................................ 61
9.8.3 Electrical connection.........................................................................................................61
9.9 USA signalling equipment.............................................................................................................. 62
9.9.1 Coupling and uncoupling..................................................................................................62
10. Maintenance and storage ............................................................................................63
10.1 Frequency chart............................................................................................................................. 63
10.2 Lubrication .....................................................................................................................................64
10.2.1 PTO shaft..........................................................................................................................64
10.2.2 Rotor................................................................................................................................. 65
10.2.3 Grease..............................................................................................................................65
10.2.4 Oil.....................................................................................................................................66
10.3 Maintenance .................................................................................................................................. 67
10.3.1 Checking the fixing elements............................................................................................67
10.4 Storage .......................................................................................................................................... 68
10.4.1 At the end of each season................................................................................................68
10.4.2 At the start of each season...............................................................................................68
11. Troubleshooting guide.................................................................................................69
12. Appendix.......................................................................................................................70
12.1 Calculating the load on an axle...................................................................................................... 70
13. Limited Warranty ..........................................................................................................80

3. - Identification of the machine
GA4121GM
5
KN129DGB D
Gyrorake
3. Identification of the machine
3.1 Front view
3.2 Rear view

GA4121GM
63. - Identification of the machine
KN129DGB D
Gyrorake
3.3 Model identification plate
Please write below the type and serialnumber of the
machine. This information is to be given to the Kuhn
authorized dealer for any spare parts order or
warranty claim.
Type: GA4121GM
Serial no.:
TYPE
MASSE kg
KUHN S.A.
67700 SAVERNE - FRANCE
N°
MADE IN FRANCE
TYPE
MASSE kg
KUHN S.A.
67700 SAVERNE - FRANCE
N°
MADE IN FRANCE

3. - Identification of the machine
GA4121GM
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KN129DGB D
Gyrorake
3.4 Optional equipment
- Tick box corresponding to the equipment fitted on
your machine:
1 3/8 - 6 spline pto shaft.
1 3/8 - 6 spline wide angle u-joint drive.
Front support wheel.
Bogie axles.
Three point frame damper.
Hydraulic windrow curtain.
Lateral signalling equipment.
Europe signalling equipment.
Adaptation parts (Europe signalling equipment).
USA signalling equipment.

GA4121GM
84. - Safety
KN129DGB D
Gyrorake
4. Safety
4.1 Description of symbols used in
this document
This symbol indicates a potentially hazardous
situation that if not avoided, could result in serious
bodily injury.
Thissymbolisusedto identify special instructions or
procedures which, if not followed strictly, could
result in machinery damage.
This symbol is used to communicate technical
information of particular interest.

4. - Safety
GA4121GM
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KN129DGB D
Gyrorake
4.2 Safety instructions
4.2.2 Read and follow the safety instructions
Before using the machine, carefully read all the
safety instructions in this manual and the warnings
placed on the machine.
Before starting work, the operator must be familiar
with all machine controls, handling devices and their
functions. It is too late to learn once work has been
started!
Never let anyone operate the machine who is not
trained to do so.
Should you have any difficulties in understanding
any parts of this manual, please contact your KUHN
dealer.
4.2.3 Precautions to be taken before carrying
out any operations on the machine
Before leaving the tractor or before adjusting,
maintaining or repairing the machine, disengage the
PTO drive, turn off the engine, remove ignition key
and wait until all moving parts have come to a
complete stop and apply park brake.
4.2.1 Introduction
The machine must only be operated, maintained and repaired by competent persons who are familiar with
machines' specifications and operation and aware of safety regulations for preventing accidents.
The operator must imperatively respect safety instructions in this manual and in the warnings posted on the
machine. The operator is also obliged to respect current legislation concerning accident prevention, work
safety and public traffic circulation.
Designated use of the machine also means following operation, maintenance and repair recommendations
given by the manufacturer, and using only genuine spare parts, equipment and accessories, as
recommended by the manufacturer.
The manufacturer is not held liable for any damage resulting from machine applications other than those
specified by the manufacturer. Any use other than the designated operation is at the risk and responsibility
of the operator.
The manufacturer is not held liablefor any damage or accident resulting from machine modifications carried
out by the operator himself or by a third party without previous written agreement from the manufacturer.

GA4121GM
10 4. - Safety
KN129DGB D
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4.2.4 Precautions to take before using the
machine
Do not wear loose clothing which could become
caught up in moving parts.
Wear the appropriate protective clothing for the
work in hand (gloves, shoes, goggles, helmet, ear
defenders, etc.).
Ensure that all operating controls (ropes, cables,
rods, etc) are placed so as they cannot be operated
unintentionally and cause damage or injury.
Before operating the machine, check tightness of
nuts and bolts, particularly on fixing elements (tines,
forks, blades, knives, etc). Retighten if necessary.
Before operating the machine, ensure that all the
safety guards are firmly in place and in good
condition. Immediately replace any worn or damaged
guard.
4.2.5 Precautions when driving
Tractor handling, stability, performance and braking
efficiency are all affected by weight distribution,
trailed or mounted implements, additional ballast
and driving conditions. It is therefore of great
importance that the operator exercises caution in
every given situation.
Groundspeed must beadapted to ground conditions
as well as to roads and paths. Always avoid abrupt
changes of direction.
Be particularly cautious when turning corners,
paying attention to machine overhang, length,
height and weight.
Never use a narrow track tractor on very uneven or
steeply sloping ground.
Never leave the tractor seat while the machine is
operating.
Carrying people or animals on the machine when
working or in transport is strictly forbidden.

4. - Safety
GA4121GM
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KN129DGB D
Gyrorake
4.2.6 Precautions when driving on public
roads
Dimensions
Depending on the dimensions of the machine,
contact the relevant authorities to ensure that it can
be legally transported on public roads.
If the machine is over the maximum legal size,
follow the local regulations for special transportation
of oversize equipment.
Transport position
Before transporting the machine on public roads,
place the machine into its transport position,
according to the instructions in this manual.
Lights and indicators
Before transporting the machine on public roads,
ensure that all legally required lightings and
signallings are in place.
Ensure that lightings and signallings are clean and
in good working order. Replace any missing or
broken equipment.
Always obey current regulations for driving
on roads.

GA4121GM
12 4. - Safety
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Gyrorake
Gross weight and weight per axle
Description of symbols
The drawings are not legally binding, their only aim is to illustrate the method to use.
Prior to driving on public roads, check that all criteria are met to be in conformity with the
countrie's regulations:
- When coupling a tool to the front and/or rear 3-point lift linkage, the maximum authorized
payload must not be exceeded.
- When coupling tools to the front and/or rear 3-point lift linkages, themaximum load on tractor's
tires must not be exceeded.
- The load on the tractor front axle must always represent 20 % of the tractor unladen weight.
For machines with hoppers or tanks:
- If the total unit weight exceeds the tractor Gross Combined Weight Rating in accordance with
the countrie's legislation, empty the hopper to travel on public roads.
- In any case, we recommend to travel on public roads with empty hoppers and tanks.
Description Units Description
T kg Tractor unladen weight
PTAC kg Gross Combined Weight Rating
T1 kg Unladen load on tractor front axle
T2 kg Empty load on tractor rear axle
t kg Axle loads (Tractor + machine)
t1 kg Load on front axle (Tractor + machine)
t2 kg Load on rear axle (Tractor + machine)
t1 max kg Maximum load authorized on the tractor front axle according to the tires
t2 max kg Maximum load authorized on the tractor rear axle according to the tires
M1 kg Total weight of front tool or front ballast

4. - Safety
GA4121GM
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KN129DGB D
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How to proceed:
Stage 1:
Stage 2:
To measure:
- Tractor tare (T).
T = _____kg
- Couple the machine to the tractor.
To measure:
- Load on front axle (t1):
• Tractor + machine (transport position).
To do:
- If the front axle load (t1) is below 20 % of the tractor
tare (T), add ballast weights (M1) to exceed the
minimum load on the front axle.
Example:
• (T) = 7500 kg (16535 lb)
• The front axle load must be of minimum 1500 kg
(3300 lb). (20 % of T).
• (t1) = 700 kg (1545 lb).
• 700 kg (1545 lb) < 1500 kg (3300 lb).
• Add ballast weights until the minimum front axle
load is exceeded.
• Repeat checking procedure.
t1 = _____kg
t1 < 20% Tt1 < 20% T
t1t1 ≥20% T20% T

GA4121GM
14 4. - Safety
KN129DGB D
Gyrorake
Stage 3:
Stage 4:
To measure:
- Total weight (t):
• Tractor + machine (transport position).
• Ballast weights.
Checking:
- To go to the next stage:
• Check in the tractor's operator's manual that the
value measured is below the tractor's Gross
Combined Weight Rating.
To do:
- If t < PTAC go to the next stage.
- If the total unit weight exceeds the tractor Gross
Combined Weight Rating in accordance with the
countrie's legislation, empty the hopper to travel on
public roads.
- Repeat checking procedure.
Example:
• (t) = 10000 kg (24250 lb)
• PTAC = 13000 kg.
• t < PTAC : Go to the next stage.
kgkg
t = _____kg
To measure:
- Load on rear axle (t2):
• Tractor + machine (transport position).
• Ballast weights.
Checking:
- Check in the tractor's operator's manual that the
value measured is below the maximum allowed
tractor rear axle load.
- Check that tyre and rim specifiations are in
conformity with the requirements of the tractor
manufacturer.
Example:
• Load on rear axle (t2) = 8500 kg (18740 lb)
• Check in the tractor's operator's manual that the
value measured is below the maximum allowed
tractor rear axle load.
• Check that tyre and rim specifiations are in
conformity with the requirements of the tractor
manufacturer.
kgkg
t2 = _____kg
t2 > t2 maxt2 > t2 max
t2t2 ≤t2 maxt2 max

4. - Safety
GA4121GM
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KN129DGB D
Gyrorake
4.2.7 PTO shaft
Use only PTO shafts supplied with the machine or
recommended by the machine manufacturer.
The protective shield of the tractor PTO stub, the
PTO shaft guards and the protective shield of the
machine input shaft must always be in place and in
good condition.
Make sure that the PTO shaft guards are secured
with the safety chains provided. Check that the PTO
shaft guard can turn freely a full rotation
independent of the shaft.
Any worn or damaged guards must be replaced
immediately. A worn guard or an unprotected PTO
shaft can cause a serious or even a lethal accident.
Do not wear loose clothing that could be caught in
the rotating PTO shaft.
Before attaching or removing a PTO shaft, or before
doing any work on the machine, disengage the PTO
drive, turn off the engine, remove ignition key and
wait for all moving parts to come to a complete stop.
If the primary PTO shaft is equipped with a torque
limiter or a free wheel, these must be fitted on the
machine side.
Ensure that the PTO shaft is always correctly fitted
and locked into place.
Before connecting the PTO shaft, ensure that the
PTO speed (rotational frequency) and direction of
rotation are in line with the machine manufacturer's
recommendations.
Before engaging the PTO drive, make sure that
there are no people or animals near the machine.
Never engage the PTO drive when the tractor
engine is stopped.

GA4121GM
16 4. - Safety
KN129DGB D
Gyrorake
Do not install any adapter device that results in a
portion of the tractor PTO stub, the rotating PTO
shaft, or the adapter to be unguarded. The tractor
master shield shall overlap the end of the splined
shaft and the added adaptor device as outlined in
the table.
PTO type Diameter X splines A ±5 mm (0.20’’)
135 mm
(1.378’’) 685 mm (3.35’’)
236 mm
(1.42’’) 885 mm (3.35’’)
335 mm
(1.378’’) 21 85 mm (3.35’’)
445 mm
(1.772’’) 20 100 mm (4.00’’)
When uncoupling the machine, rest the PTO shaft
on the support specially provided, and replace
protective shield on the PTO stub of the tractor.
Read and follow the instructions in the operator's
manual provided with the PTO shaft.
A

4. - Safety
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4.2.8 Precautions during manoeuvres
When moving the machine from the transport
position to the working position and vice versa,
make sure that nobody is within the machine
pivoting area.
4.2.9 Remote controlled components
Danger of crushing and shearing can exist when
components are operatedby hydraulic or pneumatic
controls. Keep away from these danger zones.
4.2.10 Tyres
Regularly check the tyre pressure. Respect
manufacturers' recommendations on pressure.
Assembly, disassembly and repair of wheels and
tyresmustonlybecarried out bycompetentpersons
who are equipped with standardized tools. Before
any work is performed on the wheels, ensure that
the machine rests on the ground and is perfectly
stable so that it cannot move accidentally (put
chocks in place).
4.2.11 Safety decals
Safety warning decals are placed in pictorial form on
various parts of the machine. They are there to warn
you of potential dangers and to tellyou how to avoid
accidents.
Always keep the safety decals clean and readable,
and replace them when they are worn, damaged,
missing or illegible.

GA4121GM
18 4. - Safety
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Gyrorake
4.2.12 Waste disposal
Respect the environment! Never spill pollutants (oil,
grease, filters, etc.) on the ground, never pour them
down the drain and never discard them in any other
place where they could pollute the environment.
Never throw away or burn a tyre. Always take waste
to specialized recycling or waste disposal centers.
4.2.13 Precautions for maintenance and repair
work
Before leaving the tractor or before adjusting,
maintaining or repairing the machine, disengage the
PTO drive, turn off the engine, remove ignition key
and wait until all moving parts have come to a
complete stop and apply park brake.
Rest the machine on the ground, release the
pressure from the hydraulic circuit and leave the
machine to cool down.
Make sure that the parts of the machine that need to
be lifted for maintenance or repair work are firmly
propped up.
Before any work is done on the electric circuit or
before any electric welding is carried out on the
attached machine, disconnect the machine from the
tractor electrical circuit. Also disconnect alternator
and battery terminals.
Repairs on elements under pressure or tension
(springs, pressure accumulators, etc.) must only be
carried out by competent persons with regulation
equipment.
Wear the appropriate protective clothing for the
work in hand (gloves, shoes, goggles, helmet, ear
defenders, etc.).
Do not solder, weld or use a blow torch near fluids
under pressure or inflammable products.
For your own safety and for correct machine
operation, only use original manufacturer parts.
It is strongly recommended to have your machine
checked by your Kuhn dealer after each season,
especially tools and their attaching hardware (nuts,
bolts, etc.).