KUHN GA 4311 GM User manual

ASSEMBLY / OPERATOR'S MANUAL
GA 4311 GM
GYRORAKE
N° 95315 A.GB - 07.98

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 D N T ASSUME THAT
Y U KN W H W T PERATE AND MAINTAIN Y UR MACHINE before reading this
manual carefully. KEEP THIS MANUAL AVAILABLE F R 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
Page
Safety 2
Safety decals 8
Technical specifications 9
Assembly instructions 10
Attachment : - Fitting to the tractor 1
- PTO shaft 1
Work position - adjustments 16
Operation 18
Forward speed 18
Transport 20
Parking 20
Lubrication 22
Optional accessories 2
Trouble shooting guide 30
Conditions of limited warranty 31
Copyright 1998 KUHN S.A.

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SAFETY
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 GA 4311 GM 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.
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 GA 4311 GM Gyrorake 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 recommendations 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. Before travelling on public roads, the operator must ensure that the machine conforms to road traffic regulations.
. 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. Do not wear loose clothing which could become caught up in moving elements.
6. Use a tractor equipped with a safety cab. Keep windows and roof hatch closed for reduced sound level while
operating the PTO drive implement.
7. 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 !)
8. Carrying people or animals on the machine when working or in transport is strictly forbidden.
9. Machine must only be attached to tractor using means provided and in accordance with current safety
standards.
10. When attaching or removing the machine, place the parking stand into the corresponding position.
11. Special care should be taken when attaching or removing the machine from the tractor.
12. 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.
13. Do not surpass the maximum axle load or the overall transport weight as prescribed by the tractor manufacturer.
1 . Do not exceed the maximum transport width authorized by road traffic regulations.
15. Before transporting the machine on public roads, ensure that all legally required guards and indicators (lights,
reflectors ...) are in place and in good operation.
16. All operating controls (cords, cables, rods...) must be positioned so that they cannot be set off accidently, risking
accident or damage.

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17. Before traveling on public roads, put the machine into its transport position as instructed in this operators
manual.
18. Never leave the tractor seat while the machine is operating.
19. Drive speed must be adapted to ground conditions as well as to roads and paths.
Always avoid abrupt changes of direction.
20. 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.
21. Be particularly cautious when turning corners, paying attention to machine overhang, length, height and weight.
22. Before operating the machine, ensure that all safety guards are firmly in place and in good condition. If worn
or damaged, replace immediately.
23. Before operating the machine, check the tightness of all nuts and bolts, particularly on fixing elements (blades,
tines, knives, spades ...)
2 . Keep clear of the machine operating area.
25. WARNING ! Danger of crushing and shearing can exist when components are operated by hydraulic or
pneumatic controls.
26. 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.
27. Do not stand between the tractor and the machine unless the hand brake is tight and/or stops have been placed
under the wheels.
28. Before any adjustments, maintenance or repairs are carried out, ensure that the machine cannot be started up
accidentally.
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 hydraulic 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 tractor hydraulic linkage !
. 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.

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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.
. 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 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 engine 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.
1 . Fit the safety cap on tractor PTO.
15. Replace any worn or damaged PTO guards immediately.

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TIRES
1. 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 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.
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.
. 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.

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SAFETY DECALS
THE FOLLOWING SAFETY PICTORIALS HAVE BEEN PLACED ON YOUR MACHINE IN THE AREAS
INDICATED. THEY ARE INTENDED FOR YOUR PERSONAL SAFETY AND FOR THE SAFETY OF THE
PEOPLE WORKING WITH YOU. THE TEXT SHOWN ON THEM GIVES THEIR PRECISE MEANING.
ENSURE THAT THESE PICTORIALS ARE ALWAYS LEGIBLE. IF THEY ARE NOT, REPLACE THEM.

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TECHNICAL SPECIFICATIONS
TYPE GA 4311 GM
Attachment Pivoting 3-point hitch
Category 1 and 2
Working width with single windrow up to ,20 m (13' 9")
Transport width 1,95 m (6' 5")
Forward speed up to 15 km/h (9 mph)
(depending on working conditions
Work rate up to .25 ha/hr
(10 acres/hr)
Power requirement 22 kW (30 hp)
Total weight 600 kg (1320 lbs)
PTO shaft with torque limiter
Tires 16 x 6,50 - 8
Tire pressure 2 bars
Number of tine arms 12
Number of tines 8
Special feat res : - Guards can be folded up and tine arms are removable. This greatly reduces overall transport
width.
- Swath screen is adjustable both lengthways and sideways.
- With the GA 4311 GM, the windrow is formed on the right side of the machine (seen in
direction of travel).

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ASSEMBLY INSTRUCTIONS
To reduce bulk when shipping the machine, some parts have not been fitted to the machine.
1° FITTING FRONT AND REAR GUARD HINGES
- Assemble rear guard hinges (A) to beam (B) using 6 hexagonal bolts (C) (M 12 x 55), 12 conical spring washers
(M 12) and 6 self-locking nuts (M 12) (photo 1). Do NOT tighten. Stick the 2 red reflectors (D) on the hinges (A)
(photo 3).
- Fit the connecting bar (F) on rear hinges (A) using 2 hexagonal bolts (G) (M 12 x 35) and 2 self-locking nuts (M
12). Torque to 8.5 daNm (62 ft.lbs) (photo 1).
- Now tighten the 6 bolts (C) to a torque of 12.5 daNm (92 ft.lbs)
- Fit front hinges (H) to beam (B) using 8 hexagonal bolts (I) (M 10 x 35) and 8 self-locking nuts (M 10) (photo 2).
Do NOT tighten.
2° FITTING GUARDS
- At the front of the machine fit each guard (J) on front hinges (H) by means of a roll pin (K) (diameter 10 x 5) with
washer (E) (diameter 30 x 2 x 2,5) (photo 2). The right guard is fitted with mounting lugs for the air spring (N)
(photo ).
- At the rear of the machine fit guards (J) on rear hinges (A) and at the same time fit levers (L) using 2 roll pins (M)
(diameter 10 x 55) as shown on photo 3.
-Now tighten the 8 hexagonal bolts (I) to a torque of 5 daNm (37 ft.lbs) (photo 2).
- Fit the air spring (N) by attaching it at (O) to the rear right hinge (A) using a flat washer (diameter 9 x 18 x 1.5)
and a split pin (diameter x 22) and also to the right guard (J) in the raised position using hexagonal bolt (P) (M
8 x 30) and self-locking nut (M 8) (photo ).
After assembly, make s re each safety g ard locking system works correctly.

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3° MOUNTING OF THE ROTOR LOCK CONNECTING RODS
- Fit the short connecting rod (Q) on the crank (L) of the left guard and on the lower crank (R) of the rotor lock by
means of 2 split pins (E) (diameter x 22) (photo 5).
- In the same way, fit the long connecting rod (S) on the crank (L) of the right guard and on the upper crank (T) of
the rotor lock by means of 2 split pins (E) (diameter x 22) (photo 6).
4° FITTING SWATH SCREEN
- Put the plastic bushes into their housings on the 2 parallelogram adjustment arms (U) of the swath screen.
- Fit the swath screens parallelogram adjustment (U) on the 2 pivot pins (V) using 2 roll pins (W) (diameter 6
x 36) and 2 flat washers (diameter 25 x 35 x 2), inserting washers between the roll pins (W) and the parallelogram
arm (U) (photo 7).
- Fit swath screen (X) on support (Y) into one of the vertical adjustment positions by means of 2 hexagonal bolts
(Z) (M 10 x 30), 2 self-locking nuts (M 10) and 2 flat washers (diameter 10. x 2 x ) (photo 7), inserting washers
between swath board (X) and support (Y).
5° FITTING TINES, TINE ARM HOLDERS AND TINE ARMS
- First slide tine arms (A) into their holders (B) and attach using linch pins (C) (photo 8).
- Attach the small loop of PVC cord (D) to linch pin (C) then connect the big loop into bracket hole (E) on tine arm
(A) (photo 8).
- Then fit holders (B) onto the oscillating shafts and attach using roll pins (F) (diameter 12 x 55 and diameter 7 x
55) (photo 8). Fit the tine arms (A) onto the oscillating shafts making s re that the bent form of the arms
faces forwards when looking in the direction of rotor rotation (see arrow on photo 8).
ATTENTION : Make sure that the roll pins are fitted 180° to each other and that the slots are facing the direction
of rotation (see drawing on photo 8).
Clean and reg larly apply a "Never Seize" component to the removable portion of the tine
arms (A) (photo 8) (see also page 22).
- Fit tines (G) under tine arms (A) so that tines are slanting away from the direction of rotation (see arrow on
photo 9).
- The following items are needed to fit a tine : 1 screw (H) (M 12 x 75), 1 self-locking nut (I) (M 12) (torque
8.5 daNm / 6 ft.lbs), 1 flat washer (J) (13 x 35 x 7), 1 spring washer (K), 1 wedge (L).
Make sure all items are positioned correctly, as shown on photo 9, in particular the spring washer (K) (curved face
looking upwards).

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The GA 4311 GM can be fitted to all tractors equipped with a DIN or ASEA Standard 3-point linkage. The lower
hitch pins have a diameter of 22 mm ( /5") and 28 mm (1 1/5") for tractors with Cat. 1 and 2 linkage.
The tractor link arms (A) should be attached to the hitch pins located inside the 3-point frame for Cat. 1 tractors and
outside for Cat. 2 tractors.
In the latter case, use the 25 mm diameter portion of the top link pin.
Attachment should be undertaken with the 3-point frame (B) unlocked (lever V in the raised position, photo 10).
Raise parking stand (D) (photo 10).
1° FITTING TO THE TRACTOR
2° PTO SHAFT
Connect the PTO shaft to the 540 rpm tractor drive (with the safety clutch fitted on the machine side).
Make sure PTO length is correct :
1) When the PTO is in its maximum extended position, a minimum tube overlap of 300 mm (12") must be maintained.
2) When the PTO is in its maximum overlap position (retracted), tubes must not butt against the yokes. As a safety
measure a clearance of at least 2 cm (1") must be maintained. If this is not the case, shorten the two transmission
tubes and the two guard tubes by the same length (fig. 11 and 12). Bevel and clean the tubes (fig. 13) and grease
the inside of the outer tube (fig. 1 ).
3) Never operate the PTO at too great an angle (30° maximum)
These recommendations and adjustments must be respected to avoid damage or premature wear of
the PTO.
Never connect the PTO to the 1000 rpm tractor drive.
To avoid accidents which co ld be serio s, make s re that the g ards are always correctly
in place and sec red with the safety chains provided (photo 10). Damaged g ards sho ld be
replaced immediately.
ATTACHMENT

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WORK POSITION - ADJUSTMENTS
During operation, the tractor linkage must always be in the free floating position and the transport lock of the 3-
point frame must be unlocked (lock V, photo 10, page 15). Raking height is correct when tines lightly sweep the
ground in front of the machine with tine arms kept horizontal to the ground.
BEFORE CARRYING OUT ANY OPERATION SUCH AS MAINTENANCE OR ADJUSTMENT
ON THE MACHINE, STOP THE TRACTOR ENGINE, REMOVE IGNITION KEY AND WAIT
FOR THE ROTOR TO STOP BEFORE LEAVING THE TRACTOR.
1° WHEEL HEIGHT AD USTMENT :
The adjusting system for wheel height consists of :
- a vertical sector (A) with 7 holes,
- a pin operated by lever (B) (photo 15).
The housing of axle (D) has four notches on its outer side which correspond to holes 1, 3, 5 and 7 of sector (A). The
three spaces between the notches correspond to holes 2, and 6 (photo 16).
Spring dowel (C) is used as a marker for wheel height adjustment (photo 16).
Initially, it is recommended to engage the pin in the fifth hole of sector (A).
Wheel height adjustment is carried out as follows :
- Raise the machine.
- Free the pin of vertical sector (A) using lever (B) (photo 17).
- Raise or lower each wheel by one or more holes (positions 1 to 7, photo 16).
- Put the machine back on the ground.
- Adjust the working position by lengthening or shortening the tractor top link.
NOTE : After each wheel height adjustment make sure that the pin is fully engaged in its housing on the vertical
sector.
2° SWATH SCREEN AD USTMENT
a) Sideways adjustment :
Bring the swath screen closer to or further away from the rotor, depending on crop density.
- Free lock (V) by turning it in the direction of the arrow (photo 18).
- Operate handle (P) to bring the swath screen closer to or further away from the rotor (photo 18).
- Engage lock (V) into one of the 5 possible positions (photo 18).
b) Lengthways adjustment :
The swath screen is adjusted both sideways and lengthways at the same time. To make additional lengthways
adjustment, move swath screen either toward the front or toward the rear (holes T), after first unscrewing the 2
attachment screws (F) (photo 19). When working in green forage, it is recommended to move swath screen forward
to catch any crop thrown sideways.
c) Vertical adjustment :
3 positions (E) can be selected (photo 19). As a rule, the screen (G) should be fixed in the centre. The other positions
are to be used only if necessary :
. the higher position when the ground is very uneven,
. the lower position when the crop is short and light.

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The GA 4311 GM must never be operated at a PTO speed above 5 0 rpm (see figure 20).
In general, reduce tractor engine speed until the PTO drive shaft rotates at 00 - 50 rpm to give gentle crop handling.
Depending on crop density, the machine can make single (fig. 21) or double windrows (fig. 22).
If raking is poor, it may be for either of the following reasons :
1° Poor raking with hay left in the centre (fig. 23)
To correct, shorten the top link.
2° Poor raking at sides (fig. 24)
To correct, lengthen top link and, if necessary, readjust height of tines by means of the wheels.
OPERATION
FORWARD SPEED
Forward speed must be determined in accordance with quantity of crop, type of terrain, etc. It is recommended to
always operate at a lower speed when working in difficult conditions, however it is not possible to recommend specific
speeds, these must be determined by the operator under the prevailing conditions.