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ASSEMBLY / OPERATOR'S MANUAL
GF 6401 T GYROTEDDER
N° 95215 D.GB - 04.2002
DEAR OWNER,
In buying a KUHN machine you have chosen wisely. Into it have gone years of thought,
research and improvements. 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 by 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 dependant upon how well you
read and understand this manual and apply this knowledge. Please DO NOT ASSUME THAT
YOU KNOW HOW TO OPERATE AND MAINTAIN YOUR MACHINE before reading this
manual carefully. KEEP THIS MANUAL AVAILABLE FOR REFERENCE.
Your KUHN dealer will instruct you on the general operation of your machine. He is interested
that you get the best performance possible and will be glad to answer any special questions
that may arise regarding the operation of the KUHN 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.
When ordering service parts it is important that you indicate the type of machine concerned
and its serial number.
For this reason please complete the model identification plate diagram below with the required
information. This will provide you with an easy reference for future service parts orders.
ABOUT IMPROVEMENTS
KUHN is continually striving to improve its products and, therefore, reserves 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.
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CONTENTS
Safety 2
Safety decals 8
Technical specifications 10
Assembly instructions 10
Attachment : - to the tractor 22
- PTO shaft 24
Working position and adjustments 26
Transport position 30
Parking the machine 32
Lubrication 34
Optional equipment 36
Electrical connector (for North America) 38
Conditions of limited warranty 39
Copyright 2002 KUHN S.A.
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SAFETY ADVICE
The above symbol is used throughout this manual every time recommendations are made concerning your safety,
the safety of others, or the good operation of the machine.
These recommendations must be made known to all machine operators.
DESIGNATED USE OF THE MACHINE
The GF 6401 T Gyrotedder must only be used for the work for which it has been designed : spreading and turning
pre-mowed fodder and straw. When fitted with a reduction gearbox, the GF 6401 T can also be used for forming small
night swaths in order to reduce the amount of humidity getting into the crop overnight.
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.
Designated use of the machine also means :
- following operation, maintenance and repair recommendations given by the manufacturer ;
- using only genuine spare parts, equipment and accessories as designated by the manufacturer.
The GF 6401 T Gyrotedder must only be operated, maintained and repaired by competent persons who are familiar
with machine specifications and operation and are aware of any danger involved.
The operator must imperatively respect current legislation concerning :
- accident prevention,
- work safety,
- public traffic circulation.
All safety advice indicated on the machine must be strictly observed.
The manufacturer is not held liable for any damage resulting from machine modifications carried out by the operator
himself or by a third party without previous written agreement from the manufacturer.
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GENERAL SAFETY RECOMMENDATIONS
Before operating the machine, always ensure that tractor and machine are in accordance with work safety and road
traffic regulations.
BASIC PRINCIPLES
1. In addition to the recomendations given in this manual, legislation on work safety and accident prevention must
also be respected.
2. Advice is indicated on the machine, specifying safety recommendations in order to prevent accidents.
3. When travelling on public roads, the operator must respect all road traffic regulations.
4. Before starting work, the operator must be familiar with all machine controls, handling devices and their
functions. Once at work, it is too late to do so!
5. Use a tractor equipped with a safety cab. Keep windows and roof hatch closed for reduced sound level while
operating the PTO drive implement.
6. Before starting up the machine and beginning work, check the surrounding area (beware of children!). Make sure
there is sufficient visibility.
Keep all people and animals away from the danger zone of the machine (risk of projection!).
7. Carrying people or animals on the machine when working or in transport is strictly forbidden.
8. Machine must only be attached to tractor using means provided and in accordance with current safety
standards.
9. When attaching or removing the machine, place the parking stand into the corresponding position.
10. Special care should be taken when attaching or removing the machine from the tractor.
11. Before attaching the machine, ensure that the front tractor axle is sufficiently ballasted.
Ballast is to be placed on the supports provided in accordance with instructions of the tractor manufacturer.
12. Do not surpass the maximum axle load or the overall transport weight as prescribed by the manufacturer.
13. Do not exceed the maximum transport width authorized by road traffic regulations.
14. Before transporting the machine on public roads, ensure that all legally required guards and indicators (lights,
reflectors ...) are in place and in good operation.
15. All operating controls (cords, cables, rods...) must be positioned so that they cannot be set off accidently,
risking accident or damage.
16. Before traveling on public roads, put the machine into its transport position as instructed in this operator’s
manual.
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17. Never leave the tractor seat while the machine is operating.
18. Drive speed must be adapted to ground conditions as well as to roads and paths.
Always avoid abrupt changes of direction.
19. Precision steering, tractor adherence, road holding and efficient braking are influenced by the type of implement,
weight, ballast of front axle, ground or road conditions. It is therefore of utmost importance to be cautious in
every given situation.
20. Be particularly cautious when turning corners, paying attention to machine overhang, length, height and weight.
21. Keep clear of the machine operating area.
22. WARNING ! Danger of crushing and shearing can exist when components are operated by hydraulic or
pneumatic controls.
23. Before leaving the tractor or before adjusting, maintaining or repairing the machine, turn off the engine, remove
the ignition key and wait until all moving parts have come to a complete stop.
24. Do not stand between the tractor and the machine unless the hand brake is tight and/or stops have been placed
under the wheels.
25. Before any adjustments, maintenance or repairs are carried out, ensure that the machine cannot be started
up accidentally.
PRECAUTIONS TO BE TAKEN BEFORE OPERATING THE MACHINE
1. Do not wear loose clothing which could be caught up in moving parts.
2. Wear the individual protection equipment corresponding to the work which is planned (gloves, shoes, eye
protection, helmet, ear protectors...).
3. All operating controls (cords, cables, rods ...) must be positioned so that they cannot be set off accidentally,
causing accident or damage.
4. Before operating the machine, check the tightness of all nuts and bolts, particularly on rotating parts (blades,
tines, knives, spades ...)
5. Before operating the machine, ensure that all safety guards are firmly in place and in good condition. If worn
or damaged, replace immediately.
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Rotation speed ... rpm (American Measure) is also expressed in metric measure : Rotational frequency ... min -1. Both
units are equivalent, for example : Rotation speed 540 rpm equals Rotational frequency 540 min-1.
ATTACHMENT
1. When attaching or removing the machine from the tractor, position hydraulic lift control lever in such a way that
it cannot be set off accidentally.
2. When attaching the machine to the tractor linkage, ensure that diameter of the link pins corresponds to the
diameter of the ball joints.
3. WARNING ! Danger of crushing and shearing can exist in the lifting zone of the 3-point linkage !
4. Do not stand between the tractor and the machine when operating the outer control lever of the lift mechanism.
5. In transport, the machine lift mechanism should be stabilized by tractor tie rods to avoid floatation and side
shifting.
POWER TAKE-OFF
1. Use only the PTO shaft supplied with the machine or recommended by the manufacturer.
2. PTO guards must always be in place and in good condition.
3. Check for correct PTO overlap when at work and in transport.
4. Before attaching or removing the PTO shaft, disengage PTO shaft, turn off engine and remove ignition key.
5. If a primary PTO shaft is equipped with a slip clutch or a free wheel, these must be fitted on the machine PTO.
6. Ensure that PTO shaft is always correctly fitted and locked into place.
7. Make sure guards are correctly in place and secured with the safety chains provided.
8. Before engaging PTO, ensure that PTO speed (rotational frequency) and direction are in accordance with
manufacturer's recommendations.
9. Before engaging PTO, keep all people and animals clear from the machine.
10. Never engage PTO shaft when tractor motor is turned off.
11. Never surpass the PTO angle recommended by the manufacturer.
12. WARNING ! Rotating elements can continue turning momentarily after PTO is disengaged. Keep clear until all
rotating elements are at a standstill.
13. When removing the machine, place PTO shaft on the supports provided.
14. Fit the safety cap on tractor PTO.
15. Replace any worn or damaged PTO guards immediately.
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HYDRAULIC SYSTEM
1. Beware ! The hydraulic circuit is under pressure (maximum working pressure : 200 bars/2900 psi).
2. When fitting hydraulic motors or cylinders, ensure that connections have been made correctly, as per
manufacturer’s instructions.
3. Before connecting hoses to the tractor hydraulics, ensure that tractor and machine circuits are not under
pressure.
4. It is strongly recommended that the operator mark the hydraulic connections between tractor and machine to
avoid making a wrong connection. WARNING ! Functions could be reversed (for example : lift/lower).
5. Regularly check the hydraulic hoses ! Replace the hydraulic hoses every 5 years. Damaged or worn hoses must
immediately be replaced .
When replacing the hydraulic hoses, make sure to use hoses with the specifications and quality recommended
by the manufacturer of the machine.
6. Should a leak be found, take all necessary precautions to avoid accidents.
7. Any liquid under pressure (particularly oil from hydraulics) can penetrate the skin and cause severe injury. If
injured, see a doctor immediately, there could be danger of infection.
8. Before any adjustments, maintenance or repairs are carried out, lower the machine, depressurize the circuit,
turn off the engine and remove ignition key.
TIRES
1. Before any adjustments, maintenance or repairs are carried out, ensure that the machine rests on the ground
and is perfectly stable so that it cannot move accidentally (put wedges in place).
2. Assembly, disassembly and repair of wheels and tires must only be carried out by competent persons who are
equipped with standardized tools.
3. Check tire pressure regularly !
Respect manufacturer’s recommendations on tire pressure.
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MAINTENANCE
1. Before checking for any machine malfunction and before adjusting, maintaining or repairing the machine,
disengage PTO, turn off engine and remove ignition key.
2. Check tightness of nuts and bolts regularly. Retighten if necessary.
3. If the machine is raised, prop it up in a stable position before carrying out any maintenance work.
4. When replacing a working part, wear protection gloves and only use standardized tools.
5. It is forbidden to discard any oil, grease or filters. These must be given to waste disposal organisations to protect
the environment.
6. Disconnect power source before any work is done to the electric system.
7. Check safety guards regularly, particularly those that are subject to wear. Replace immediately if damaged.
8. Spare parts used must be in accordance with specifications and standards as defined by the manufacturer.
Use only genuine KUHN parts !
9. Before any electric welding is carried out on tractor or attached machine, disconnect generator and battery
terminals.
10. Repairs on elements under pressure or tension (springs, accumulators etc...) must only be carried out by
competent persons with standardized equipment.
SPECIAL SAFETY RECOMMENDATIONS
1. When changing the machine over from the work to the transport position or vice versa, danger of crushing and
shearing can exist.
Be especially careful and keep all persons away from vicinity of the machine when maneveuring.
2. Never tow the machine at speeds higher than 25 km/h (15 mph).
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The following safety pictorials have been placed on your machine in the areas indicated. They
are intented for your personal safety and for the safety of the people working with you. The text
shown on them gives their precise meaning. Keep the pictorials clean. Replace them when they
are faded.
SAFETY DECALS
MODEL IDENTIFICATION PLATE
1
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8
6
4
5
3
9
7
2
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ASSEMBLY INSTRUCTIONS
A - MACHINES SHIPPED IN CRATES
To facilitate shipping, the GF 6401 T is packed in a wooden crate with some disassembled parts.
Also, on certain machines, the roll pins (L) (photo A) have not been driven in so that the side wings can be folded
even further towards the inside, thus reducing the shipping width of these machines.
Before using the machine, make sure that the roll pins (L) are driven in the housings so that
they protrude by approximately 10 mm on each side of the housing (distance X in photo A).
TECHNICAL SPECIFICATIONS
Attachment pivoting hitch
Number of rotors/tine arms per rotor 6 / 6
Working width (DIN 11220) 6.40 m / 21'
Width in working position 6.75 m / 22'1"
Length in working position 3.90 m / 12'9"
Transport width 2.95 m / 9’8"
Length in transport position 3.70 m / 12'2"
Height in transport position (when machine is resting on the ground) 3.45 m / 11'4"
Power requirement (at the PTO) 22 kW / 30 hp
Weight with PTO shaft 1100 kg/2420 lbs
Tyres : Lateral rotors 15 x 6.00 - 6 / Pressure 2 bars - 29 psi
Central rotors 220 / 50 - 6 / Pressure 2.5 bars - 36 psi
Transport frame 145 x 13 / Pressure 3 bars - 43 psi
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ASSEMBLY INSTRUCTIONS
1. Assembling the cylinder pins on the rear undercarriage (photo 1)
Disengage the locking pin (L) from the intermediate housings (N) (photo 27, page 33) and insert it into the storage
housings (R) (photo 26, page 33).
Pivot the rear undercarriage (G) down towards the rear. Next, join the hydraulic cylinders (9) to the rear undercarriage
(G) using 2 pins (10), 2 roll pins (11) (diameter 8 x 40) and 2 self-locking screws (M10 x 20).
2. Fitting tines and tine arms
Assemble and secure tine arms as shown in figure 2.
1 = self-locking screw M 12 x 30
2 = self-locking nut M 12
Tighten to a torque of 12 daNm (88 ft.lbs)
Tines must be fitted on the tine arms in such a way that the longest finger is on the
outside and the pressure from the crop closes the spirals.
There are two types of tines :
a) Tines for rotors which turn to the left (counter clockwise) : the “KUHN” marking is found on the longest finger (see
figure 3).
b) Tines for rotors which turn to the right (clockwise) : the “KUHN” marking is found on the shortest finger.
Attach tines (6) and their deflectors (11) to tine arms (7) with hexagon bolt (8) (M 14 x 50), plain washer (9)
(dia. 14,5 x 35 x 7) and a self locking nut (10) (M 14) as shown in figure 3.
Torque to 16 daNm / 120 ft.lbs.
3. Assembling the wheels (photo 4)
Fit the preassembled wheel sets (P) onto the rotor axles (A) so that the handles are pointing rearwards. Each wheel
set is numbered and must be matched to the rotor axle in such a way that the handles are directed towards the rear.
Secure using roll pins (J) (dia. 8 x 50). Do not forget to install flat washers (K) (35 x 50 x 1) and spacers (E) between
supports (L) and roll pins (J).
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2
4
3
1
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ASSEMBLY INSTRUCTIONS
4. Assembling the transport wheel deflectors (photo 5)
Fit the two preassembled deflectors (U) onto the axle (V) using 4 self-locking bolts (Z) (M 10 x 25) and 4 self-locking
nuts (M 10).
Fit the 2 triangulation bars (Y) to the axle holder and to the deflector (U) using 4 self-locking nuts (Z) (M 10 x 25)
and 4 self-locking bolts (M 10).
5. Fitting the safety guards (photos 6 and 7)
Fit the side beams (H) onto the central rotor housings using 4 hexagon screws (C) (M12 x 90) and 4 conical spring
washers (D) (M12).
Fit the front crossbar (F) to the 2 side beams (H) using 4 hexagon screws (M) (M 12 x 60) and 4 self-locking nuts
(M 12) (torque 8 daNm/60 ft.lbs). Insert 2 support pads (N) between the bolt heads and the crossbars (photo 6).
Fix the rear crossbar (O) onto the rear undercarriage (G) using pin (I) and 2 roll pins (J) (diameter 6 x 30) and onto
the link (L) using hexagon screw (K) (M12 x 40), self locking nut (M12) and 2 conical spring washers (M12) (photo
7). Ensure that the hexagon screw is not tightened completely (K).
6. Fitting the signalling and lighting elements (photos 8, 9,10 and 10' and figure A)
When fitting the signalling elements make sure that the white and red stripes are pointing in the right direction (the
red corners should be located at the top, pointing outwards).
At the same time, fit the 2 rear signalling panels (1) and the reflector support plates (2) onto the rear crossbar (O)
using 6 hexagon screws (4) (M10 x 45), 4 hexagon screws (5) (M 10 x 20) and 10 self locking nuts (M 10) (photo
9).The largest support plate (2) is to be fitted on the left side (photo 9).
Fix the front right signalling panel (6) on the front crossbar (F) using 2 hexagon screws (4) (M 10 x 45), 2 hexagon
screws (5) (M10 x 20) and 4 self locking nuts (M 10) (photo 10).
Fix the front left signalling panel (6') at the same time as the spare wheel (7) onto the front crossbar (F) using
2 hexagon screws (8) (M 10 x 55), 1 hexagon screw (4) (M10 x 45), 1 hexagon screw (5) (M10 x 20) and 4 self
locking nuts (M10) (photo 10').
Stick the white reflectors (U) on the front signalling panels (6 and 6') as shown in photos 10 and 10'.
Fit the white lights (Q) (slit E pointing downwards) on the front warning boards (photos 10 and 10').
Fit the rear left light (R ) marked “L” on the rear left warning board (1) (photo 9). The rear left light connector
is also identified by a white cable sheath (highlighted in grey on figure A).
Fit the rear right light marked “R” on the rear right warning board.
Plug the harness connectors to the corresponding pilot and tail lamp terminals .The locking tab (12) of
the female connector (13) must be fully engaged over the peg (14) of the male connector (15) (fig. A).
Fix the electric cables on the crossbar (F) and (O) using the clamp collars (T) as shown in photos 8, 10 and 10'.
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6
7
10
9
10' A
8
5
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B) Machines shipped in ‘Container packing’
When unloading ‘container packed’ GF 6401 T, make sure the danger area is clear of
people.
To unload ‘container packed’ GF 6401 T a lifting device with a minimum lifting capacity of 2 tons needs to be used
(hoist, crane etc…).
Use two nylon straps (A) of length 2m (minimum capacity of each strap:1500 kg / 3300 lbs) and attach them to the
rotor axles, as shown in photo A.
Proceed as follows:
- Using the crane, unload the machine onto the ground, keep the straps taut, remove the wooden wedges (B and
C), tension hoops and maintaining wires taking the usual safety precautions (photo A).
- Put wedges (D) under the back wheels, then slightly lift the machine and put the wooden wedge (C) under the
support (E) (photo B).
- Fix a nylon strap (A) to the upper ring (F) of the headstock (G), lift the crane until strap (A) is tight (photo C).
- Take out the roll pins (diameter 5 x 50 and 8 x 50) then remove the pivoting axle (H) and lower the headstock (G)
to the ground (photo C).
- Remove the two mounting nuts and bolts (I) and detach the connecting frame (J) (photos D and E). Two people
are needed to assist in this operation (photo E).
- With the crane lift the machine and pivot it about its rear wheels (K) place a trestle (L) with a height of approx. 76
cm / 30” and capable of holding a minimum load of 1 ton under the support (E) (photo F).
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AB
CD
EF
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-Remove the four mounting nuts and bolts (I) and detach the support (M) (photo G).
- Glide the connecting frame (J) in its housing on the chassis (N) (photo H) and secure it using the 6 original mounting
nuts and bolts (I) (photo I) making sure the six conical spring washers are in the correct position (convex side
against bolt head) (Torque to 22 daNm / 162 ft.Ibs). Simultaneously connect the drive shaft (O) to the central
gearbox input shaft and secure with the nut and bolt (P) (photo I).
- Install the stand (Q) with the axle (R) and 2 roll pins (S) (diameter 8 x 40) under the connecting frame (J), put a
wooden wedge (B) under the stand (photo J).
- Remove the trestle (L) (photo J) and the support (E) by unscrewing the mounting hardware (T) (photo K).
- Re-install the headstock (G) on the connecting frame (J) with the axle (H) and the roll pins (U) (diameter 5 x 50
and 8 x 50) (photo L).This manoeuvre is made easier using a strap (A) and the crane (photo L).
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