KUHN GF 6401 T User manual

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,
researchandimprovements.Youwillfind,ashavethousandsofownersallovertheworld,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.Theperformanceyougetfromthismachineislargelydependantuponhowwellyou
readandunderstandthismanualandapplythisknowledge.PleaseDONOTASSUMETHAT
YOU KNOW HOW TO OPERATE AND MAINTAIN YOUR MACHINE before reading this
manual carefully. KEEP THIS MANUAL AVAILABLE FOR REFERENCE.
YourKUHN dealerwillinstruct youonthegeneral operationofyourmachine. He isinterested
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.
Forthisreasonpleasecompletethemodelidentificationplatediagrambelowwiththerequired
information. This will provide you with an easy reference for future service parts orders.
ABOUT IMPROVEMENTS
KUHN iscontinuallystriving to improveitsproducts and,therefore,reserves the righttomake
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
Safetydecals 8
Technicalspecifications 10
Assembly instructions 10
Attachment : - to the tractor 22
-PTOshaft 24
Workingpositionandadjustments 26
Transportposition 30
Parkingthemachine 32
Lubrication 34
Optionalequipment 36
Electricalconnector(forNorthAmerica) 38
Conditionsoflimitedwarranty 39
Copyright2002 KUHN S.A.

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SAFETY ADVICE
Theabovesymbolisusedthroughoutthismanualeverytimerecommendationsaremadeconcerningyoursafety,
the safety of others, or the good operation of the machine.
Theserecommendationsmustbemadeknown to all machine operators.
DESIGNATED USE OF THE MACHINE
TheGF6401TGyroteddermustonlybeusedfortheworkforwhichithasbeendesigned:spreadingandturning
pre-mowedfodderandstraw.Whenfittedwithareductiongearbox,theGF6401Tcanalsobeusedforformingsmall
night swaths in order to reduce the amount of humidity getting into the crop overnight.
Themanufacturerisnotheldliableforanydamageresultingfrommachineapplicationsotherthanthosespecified
bythemanufacturer.
Any use other than the designated operation is at the risk and responsibility of the operator.
Designated use of the machine also means :
- followingoperation,maintenanceandrepairrecommendationsgivenbythemanufacturer;
- usingonlygenuine spare parts, equipmentandaccessories as designated bythemanufacturer.
TheGF6401TGyrotedder mustonlybeoperated,maintainedandrepairedbycompetentpersonswhoarefamiliar
withmachinespecificationsandoperationandareawareofanydangerinvolved.
Theoperatormustimperativelyrespectcurrentlegislationconcerning:
-accidentprevention,
- work safety,
-public traffic circulation.
All safety advice indicated on the machine must be strictly observed.
Themanufacturerisnotheldliableforanydamageresultingfrommachinemodificationscarriedoutbytheoperator
himselforbyathirdpartywithoutpreviouswrittenagreementfromthemanufacturer.

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GENERALSAFETYRECOMMENDATIONS
Beforeoperatingthemachine,alwaysensurethattractorandmachineareinaccordancewithworksafetyandroad
trafficregulations.
BASICPRINCIPLES
1. Inadditiontotherecomendationsgiveninthismanual,legislationonworksafetyandaccidentpreventionmust
alsobe respected.
2. Adviceis indicatedon the machine, specifyingsafety recommendations in orderto prevent accidents.
3. Whentravelling 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. Useatractorequippedwithasafetycab.Keepwindowsandroofhatchclosedforreducedsoundlevelwhile
operatingthePTOdriveimplement.
6. Beforestartingupthemachineandbeginningwork,checkthesurroundingarea(bewareofchildren!).Makesure
there is sufficient visibility.
Keepallpeople and animals awayfromthedanger zone of themachine(riskof projection!).
7. Carryingpeople oranimals on themachine when workingor in transportis strictly forbidden.
8. Machine must only be attached to tractor using means provided and in accordance with current safety
standards.
9. Whenattaching or removingthemachine,placetheparking stand into the correspondingposition.
10. Specialcare should be takenwhenattachingor removing the machinefromthe 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 surpassthe maximum axleload or the overall transportweight as prescribedby the manufacturer.
13. Donot exceed the maximumtransportwidthauthorized by road trafficregulations.
14. Beforetransportingthemachineonpublicroads,ensurethatalllegallyrequiredguardsandindicators(lights,
reflectors...) are in place andin good operation.
15. All operating controls (cords, cables, rods...) must be positioned so that they cannot be set off accidently,
riskingaccidentor 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. Neverleavethe tractorseatwhilethemachineisoperating.
18. Drive speed must be adapted to ground conditions as well as to roads and paths.
Alwaysavoidabruptchangesofdirection.
19. Precisionsteering,tractoradherence,roadholdingandefficientbrakingareinfluencedbythetypeofimplement,
weight, ballast of front axle, ground or road conditions. It is therefore of utmost importance to be cautious in
everygivensituation.
20. Beparticularlycautiouswhenturningcorners,payingattentiontomachineoverhang,length,heightandweight.
21. Keepclearofthemachineoperatingarea.
22. WARNING ! Danger of crushing and shearing can exist when components are operated by hydraulic or
pneumaticcontrols.
23. Beforeleavingthetractororbeforeadjusting,maintainingorrepairingthemachine,turnofftheengine,remove
the ignition key and wait until all moving parts have come to a complete stop.
24. Donotstandbetweenthetractorandthemachineunlessthehandbrakeistightand/orstopshavebeenplaced
underthewheels.
25. Beforeany adjustments, maintenance orrepairsarecarried out, ensure thatthemachine cannot be started
up accidentally.
PRECAUTIONSTOBETAKENBEFOREOPERATINGTHEMACHINE
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,earprotectors...).
3. All operating controls (cords, cables, rods ...) must be positioned so that they cannot be set off accidentally,
causingaccidentor damage.
4. Beforeoperatingthemachine,checkthe tightnessofallnutsandbolts, particularlyonrotatingparts(blades,
tines, knives, spades ...)
5. Beforeoperatingthemachine, ensurethatallsafety guards are firmly in place andingoodcondition.Ifworn
ordamaged,replaceimmediately.

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Rotationspeed...rpm(AmericanMeasure)isalsoexpressedinmetricmeasure:Rotationalfrequency...min-1.Both
unitsareequivalent,for example : Rotation speed540rpmequalsRotationalfrequency540min-1.
ATTACHMENT
1. Whenattachingorremovingthemachinefromthetractor,positionhydraulicliftcontrolleverinsuchawaythat
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. Donotstandbetweenthetractorandthemachinewhenoperatingtheoutercontrolleveroftheliftmechanism.
5. In transport, the machine lift mechanism should be stabilized by tractor tie rods to avoid floatation and side
shifting.
POWERTAKE-OFF
1. Useonly thePTO shaft supplied withthe machine or recommendedby the manufacturer.
2. PTO guards must always be in place and in good condition.
3. CheckforcorrectPTOoverlapwhen atworkandintransport.
4. BeforeattachingorremovingthePTOshaft,disengagePTOshaft,turnoffengineandremoveignitionkey.
5. IfaprimaryPTOshaftisequippedwithaslipclutchorafreewheel,thesemustbefittedonthemachinePTO.
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'srecommendations.
9. BeforeengagingPTO,keepallpeople and animalsclearfromthemachine.
10. NeverengagePTOshaftwhentractormotoristurnedoff.
11. NeversurpassthePTOanglerecommendedbythemanufacturer.
12. WARNING!RotatingelementscancontinueturningmomentarilyafterPTOisdisengaged.Keepclearuntilall
rotating elements are at a standstill.
13. Whenremovingthemachine,placePTOshaftonthesupportsprovided.
14. Fit the safety cap on tractor PTO.
15. ReplaceanywornordamagedPTOguardsimmediately.

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HYDRAULICSYSTEM
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’sinstructions.
3. Before connecting hoses to the tractor hydraulics, ensure that tractor and machine circuits are not under
pressure.
4. Itisstronglyrecommendedthattheoperatormark thehydraulicconnectionsbetweentractorandmachineto
avoidmakingawrongconnection.WARNING!Functionscouldbereversed(forexample:lift/lower).
5. Regularlycheckthehydraulichoses!Replacethehydraulichosesevery5years.Damagedorwornhoses must
immediatelybe replaced .
Whenreplacingthehydraulichoses,makesuretousehoseswiththespecificationsandqualityrecommended
bythemanufacturerof the machine.
6. Should a leak be found, take all necessary precautions to avoid accidents.
7. Anyliquidunderpressure(particularlyoilfromhydraulics)canpenetratetheskinandcause severe injury. If
injured,see a doctor immediately,therecould be dangerofinfection.
8. Beforeanyadjustments,maintenanceorrepairsarecarriedout,lowerthemachine,depressurizethecircuit,
turnofftheengineandremoveignitionkey.
TIRES
1. Beforeanyadjustments,maintenanceorrepairsarecarriedout,ensurethatthemachinerestson theground
and is perfectly stable so that it cannot move accidentally (put wedges in place).
2. Assembly,disassemblyandrepairofwheelsandtiresmustonlybecarriedoutbycompetentpersonswhoare
equippedwithstandardizedtools.
3. Checktirepressureregularly!
Respect manufacturer’s recommendations ontire pressure.

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MAINTENANCE
1. Before checking for any machine malfunction and before adjusting, maintaining or repairing the machine,
disengagePTO,turnoffengineandremoveignitionkey.
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. Whenreplacing a working part, wear protection gloves andonlyusestandardizedtools.
5. Itisforbiddentodiscardanyoil,greaseorfilters.Thesemustbegiventowastedisposalorganisationstoprotect
theenvironment.
6. Disconnect power source before any work is done to the electric system.
7. Checksafetyguardsregularly,particularlythosethataresubjecttowear.Replaceimmediatelyif damaged.
8. Sparepartsused must be inaccordance with specificationsand standards asdefined by themanufacturer.
UseonlygenuineKUHNparts !
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
competentpersonswithstandardizedequipment.
SPECIAL SAFETY RECOMMENDATIONS
1.Whenchanging themachineoverfromtheworkto thetransportpositionorviceversa,danger ofcrushingand
shearing can exist.
Beespeciallycareful and keepallpersonsawayfromvicinity of themachinewhenmaneveuring.
2. Nevertow themachine at speedshigher than 25km/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,oncertainmachines, the roll pins(L)(photoA)have not been driveninsothatthe side wings canbefolded
evenfurthertowardstheinside,thusreducingtheshippingwidthofthesemachines.
Beforeusingthemachine,makesurethattherollpins(L)aredriveninthehousingssothat
theyprotrude byapproximately10 mmon eachsideof thehousing(distance Xin photoA).
TECHNICAL SPECIFICATIONS
Attachment pivotinghitch
Numberofrotors/tinearmsperrotor 6 / 6
Workingwidth(DIN11220) 6.40 m / 21'
Width in working position 6.75 m / 22'1"
Lengthinworkingposition 3.90 m / 12'9"
Transportwidth 2.95 m / 9’8"
Lengthintransportposition 3.70 m / 12'2"
Heightintransportposition (whenmachine isresting on theground) 3.45 m / 11'4"
Powerrequirement(atthePTO) 22 kW / 30 hp
Weightwith PTOshaft 1100kg/2420lbs
Tyres : Lateralrotors 15 x 6.00 - 6 / Pressure 2 bars - 29 psi
Centralrotors 220 / 50 - 6 / Pressure 2.5 bars - 36 psi
Transportframe 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)
Disengagethelockingpin(L)fromtheintermediatehousings(N)(photo27,page33)andinsertitintothestorage
housings(R)(photo26,page33).
Pivottherearundercarriage(G)downtowardstherear.Next,jointhehydrauliccylinders(9)totherearundercarriage
(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
Tightentoa torque of 12daNm(88ft.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) Tinesforrotorswhichturntotheleft(counterclockwise):the“KUHN”markingisfoundonthelongestfinger(see
figure3).
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)
Fitthepreassembledwheelsets(P)ontotherotoraxles(A)sothatthehandlesarepointingrearwards. Eachwheel
setisnumberedandmustbematchedtotherotoraxleinsuchawaythatthehandlesaredirectedtowardstherear.
Secureusingrollpins(J)(dia.8x50).Donotforgettoinstallflatwashers(K)(35x50x1)andspacers(E)between
supports(L) and rollpins(J).

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2
4
3
1

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ASSEMBLY INSTRUCTIONS
4. Assembling the transport wheel deflectors (photo 5)
Fitthetwopreassembleddeflectors(U)ontotheaxle(V)using4self-lockingbolts(Z)(M10x25)and4self-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)
Fitthesidebeams(H)ontothecentralrotorhousingsusing4hexagonscrews(C)(M12x90)and4conicalspring
washers(D)(M12).
Fitthe front crossbar (F) tothe 2 sidebeams (H) using 4 hexagonscrews (M) (M12 x 60)and 4self-locking nuts
(M12) (torque8 daNm/60 ft.lbs).Insert 2 support pads (N)between the bolt heads andthe crossbars (photo 6).
Fixtherearcrossbar(O)ontotherearundercarriage(G)usingpin(I)and2rollpins(J)(diameter6x30)andonto
thelink(L)usinghexagonscrew(K)(M12x40),selflockingnut(M12)and2conicalspringwashers(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)
Whenfittingthesignallingelementsmakesurethatthewhiteandredstripesarepointingintherightdirection(the
redcorners shouldbe located atthe top, pointing outwards).
Atthesametime, fit the 2 rearsignallingpanels(1)andthereflectorsupportplates(2) onto the rearcrossbar(O)
using6 hexagon screws (4) (M10x 45), 4 hexagon screws(5) (M 10x 20)and 10 selflocking nuts (M 10) (photo
9).The largest support plate (2) is to be fitted on the left side (photo 9).
Fixthefrontrightsignallingpanel(6)onthefrontcrossbar(F)using2hexagonscrews(4)(M10x45),2hexagon
screws (5) (M10 x 20) and 4 self locking nuts (M 10) (photo 10).
Fixthefrontleftsignallingpanel (6') at the same time as the spare wheel (7) ontothefrontcrossbar(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
lockingnuts (M10)(photo10').
Stick the white reflectors (U) on the front signalling panels (6 and 6') as shown in photos 10 and 10'.
Fitthe white lights(Q) (slit Epointing downwards) on the frontwarning boards (photos10 and 10').
Fittherearleftlight (R)marked“L”ontherear leftwarningboard(1)(photo9). Therearleftlightconnector
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.
Tounload‘containerpacked’GF 6401Taliftingdevicewithaminimumliftingcapacityof2tonsneedstobeused
(hoist, crane etc…).
Usetwonylonstraps(A)oflength2m(minimumcapacityofeachstrap:1500kg/3300lbs)andattachthemtothe
rotor axles, as shown in photo A.
Proceedasfollows:
- Usingthecrane,unloadthemachineontotheground,keepthestrapstaut,removethewoodenwedges(Band
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)(photoB).
- Fix a nylon strap (A) to the upper ring (F) of the headstock (G), lift the crane until strap (A) is tight (photo C).
- Takeouttherollpins(diameter5x50and8x50)thenremovethepivotingaxle(H)andlowertheheadstock(G)
totheground(photoC).
- Removethetwomountingnutsandbolts(I)anddetachtheconnectingframe(J)(photosDand E).Twopeople
are needed to assist in this operation (photo E).
- Withthecraneliftthemachineandpivotitaboutitsrearwheels(K)placeatrestle(L)withaheightofapprox.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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-Removethefourmountingnutsandbolts(I)anddetachthesupport(M)(photoG).
- Glidetheconnectingframe(J)initshousingonthechassis(N)(photoH)andsecureitusingthe6originalmounting
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
woodenwedge(B)underthestand(photoJ).
- Removethe trestle(L)(photoJ)andthesupport(E)byunscrewingthemountinghardware(T)(photo K).
- Re-installthe headstock (G) on theconnecting frame (J)with the axle(H) and the roll pins(U) (diameter 5x 50
and8 x50) (photo L).Thismanoeuvre is made easier usinga strap (A) and thecrane (photo L).