KUHN EL 50 N User manual

ASSEMBLY / OPERATOR'S MANUAL
EL 50 N
POWER TILLER
N° 95453 A.GB - 10.97

DEAR OWNER,
In buying a KUHN machine you have chosen wise y. Into it have gone years of thought,
research and improvements. You wi find, as have thousands of owners a over the wor d, that
you have the best that engineering ski and actua fie d testing can produce. You have
purchased a dependab e machine, but on y by proper care and operation can you expect to
receive the performance and ong service bui t into it.
This manua contains a the necessary information for you to receive fu efficiency from your
machine. The performance you get from this machine is arge y dependant upon how we you
read and understand this manua and app y this know edge. P ease DO NOT ASSUME THAT
YOU KNOW HOW TO OPERATE AND MAINTAIN YOUR MACHINE before reading this
manua carefu y. KEEP THIS MANUAL AVAILABLE FOR REFERENCE.
Your KUHN dea er wi instruct you on the genera operation of your machine. He is interested
that you get the best performance possib e and wi be g ad to answer any specia questions
that may arise regarding the operation of the KUHN machine.
Your KUHN dea er can offer a comp ete ine of genuine KUHN service parts.
These parts are manufactured and carefu y inspected in the same factory that bui ds the
machine to assure high qua ity and accurate fitting of any necessary rep acements.
When ordering service parts it is important that you indicate the type of machine concerned
and its seria number.
For this reason p ease comp ete the mode identification p ate diagram be ow with the required
information. This wi provide you with an easy reference for future service parts orders.
ABOUT IMPROVEMENTS
KUHN is continua y striving to improve its products and, therefore, reserves the right to make
improvements or changes when it becomes practica to do so, without incurring any
ob igations to make changes or additions to the equipment so d previous y.

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CONTENTS
Page
Safety 2
Safety decals 7
Technical specifications 9
Safety guards 10
Off-setting 11
Fitting to the tractor 12
P.T.O. shaft 13
Slip clutch 1
Rotor speed 16
Use 16
Optional accessories 18
1° Wheel assembly 18
2° Skids + Stand 18
3° P.T.O. shaft with friction slip clutch 18
4° Signalling elements 19
° P.T.O. shafts 19
Maintenance 20
1° Lubrication 20
2° Fitting blades 21
Trouble shooting 23
Conditions of limited warranty 24
Copyright 1997 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 EL 50 N must only be used for the work for which they have been designed :
- Seedbed preparation on ploughed or unploughed ground.
- Stubble ploughing or reclamation of grassland.
- Orchard and vineyard cultivation.
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 EL 50 N must only be operated, maintained and repaired by competent persons who are familiar with machine
specifications and operations 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 meet 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.
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 this !
. 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 driven 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. 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 exceed the maximum axle load or the overall transport weight prescribed by the tractor manufacturer.
13. Do not surpass 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.
1 . 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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16. Before traveling on public roads, put the machine into its transport position as instructed in this operators
manual.
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. Before operating the machine, ensure that all safety guards are firmly in place and in good condition. If worn
or damaged, replace immediately.
22. Before operating the machine, check the tightness of all nuts and bolts, particularly on fixing elements
(blades, tines, knives, spades ...)
23. Keep clear of the machine operating area.
24. WARNING ! Danger of crushing and shearing can exist when components are operated by hydraulic or
pneumatic controls.
2 . 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.
26. Do not stand between the tractor and the machine unless the hand brake is tight and/or stops have been
placed under the wheels.
27. 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 correspond
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 !
4. Do not stand between the tractor and the machine when operating the outer control lever of the lift mechanism.
. In transport, the machine lift mechanism should be stabilized by tractor tie rods to avoid floatation and side
shifting.
6. When transporting the machine ensure that it can not be lowered accidentally.

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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.
4. Before attaching or removing the PTO shaft, disengage PTO shaft, turn off engine and remove ignition key.
. 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.
14. Fit the safety cap on tractor PTO.
1 . Replace any worn or damaged PTO guards immediately.

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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 nut and bolt tightness 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 use only standardized tools.
. 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. KEEP THE PICTORIALS LEGIBLE. IF THEY ARE NOT, REPLACE THEM.

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TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
EL50N EL50N EL50N EL50N EL50N EL50N
92 105 117 130 155 180
Working width cm (") 92 (36) 10 (41) 117 (46) 130 ( 1) 1 (60) 180 (71)
Maximum tractor DIN ower kW (hp) 36 (50)
Minimum power requirement kW (hp) 13 (18) 1 (20) 17 (23) 19 (26) 22 (30) 2 (34)
P.T.O. speed (rpm) 40
Rotor speed (rpm) 212
Rotor diameter mm (") 4 0 (18")
Number of mulch blades (3 pair formation) 24 24 30 30 36 42
Working depth mini / maxi cm (") 7 - 20 (3" - 8")
Working depth control Gauge wheels or skids
P.T.O. shaft (standard) without friction slip clutch
Off-setting to the right by 17 cm / 6.7" no no yes yes yes yes
Attachment Cat. 1 N (narrow) - 1 - 2
Total width cm (") 110 (43) 123 (48) 134 ( 3) 148 ( 8) 173 (68) 199 (78)
Weight with gauge wheels kg (lbs) 236 (519) 255 (561) 274 (603) 289 (636) 306 (673) 340 (748)
Weight with skids kg (lbs) 220 (484) 239 (526) 258 (568) 273 (601) 290 (638) 324 (713)
with friction
slip clutch

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SAFETY GUARDS
The safety guards protect against accidents and therefore ensure maximum machine safety.
The safety guards (P) are factory installed on each side of the machine as shown in photos 1 and 2..
The safety guards must always remain fitted.

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OFF-SETTING
(only for EL 50 N - 117 / 130 / 155 / 180)
The EL 50 N Power Tiller can be mounted behind a tractor in an off-set position to the right (or in line with the tractor).
The setting of the machine in this position should be carried out before mounting to the tractor.
The offset position is obtained by removing the head stock from its central position (A) and mounting it in position
(B) (photo 3). To avoid accidents, make sure the power tiller is properly secured before removing the head stock.
Use a hoist, lifting from the tube. Avoid using makeshift props that are unsafe.
Position A : in line Position B : 17 cm (6.7") off-set "D".
When reassembling, make sure all bolts (V) (photo 4) are tightened to a torque of 21 daNm (155 ft.lbs).
After reassembling the head stock, make sure the front safety guards (P) are correctly fitted (photo 4).

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FITTING TO THE TRACTOR
The EL 50 N has two adjustment settings giving the following attachment possibilities :

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P.T.O. DRIVE SHAFT
Make sure the EL 50 N is resting on the ground and is maintained in a stable position with the parking stand or
with the front wheels. Clean and lubricate the gearbox input shaft and slide the mating PTO shaft yoke in place.
After mounting the Power Tiller, stabilize the tractor 3-point linkage with whatever means are recommended (tie
bars, chains etc.).
Be sure the tractor P.T.O. shaft drive is disengaged and stop engine.
Couple the PTO shaft to the tractor P.T.O. stub.
Attachment is correct when machine is horizontal in work position.
With the machine resting on the ground, adjust the top link (P) length to a position where the tractor PTO stub
and the tiller input shaft are parallel.
In working osition :
- The 2 angles (K) formed by the centre lines of the yoke and the sliding tubes must be equal and not exceed
a combined angle of 30° when working.
- The sliding tube overlap (L) must be at least 22 cm (8. ") (fig. 8).

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With the machine fully raised on the tractor hydraulic linkage :
- The 2 sliding tubes must not completely overlap each other ; a gap (M) of 1 cm (3/8") should exist between end
of sliding tube and yoke.
- Both U joints (K) should operate approximately at the same bent angles which must never exceed 40°
(fig. 8).
Should the above mentioned conditions not exist :
- Shorten both tubes by an equal length, chamfer edges and grease liberally before refitting.
- To avoid noisy running of the PTO shaft when lifting the machine out of work, attach top link (P) so that it is
almost parallel to the lower links (fig. 8).
Im ortant : Always disconnect the tractor PTO drive before lifting the machine into the transport position,
otherwise permanent damage can be caused to the transmission shaft.
Repeat these adjustments each time the machine is mounted to a different tractor.
A safety chain (C) is delivered with the machine to
support the PTO shaft (T) when the machine is
parked. This prevents the PTO shaft from becoming
soiled or deteriorated when in contact with the ground.
Attach the chain (C) to the support (U) as shown in the
photo 9 opposite.
Always make sure the PTO shaft guards are in good condition and secured with the safety chains
provided to prevent them from turning. The safety chains should be attached to the side of the
machine at the safety guard of the central gearbox (photo 9). Replace guards immediately if they
become damaged.

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FRICTION SLIP CLUTCH
The EL 50 N - 155 and 180 are factory equipped with a PTO transmission shaft complete with friction slip clutch.
For the other types this equipment is available upon request.
The spring pressures are adjusted before delivery to
a length of 28 mm to give a correct load with PTO
speed of 40 rev/min.
The theoretical length «L» of springs «R» is an
average setting and slight deviations can be made
according to working conditions and tractor engine
rating.
The springs of the slip clutch must all be equally adjusted to a setting where the implement can operate under
normal conditions without the plates slipping. However, when extreme conditions are encountered, such
obstructions, the friction plates must slip.
IMPORTANT : * Always check if the clutch is set correctly for the work to be carried out. It should feel warm
to the touch during work.
* If the clutch slips excessively (too light a spring pressure, obstacles, etc.), readjust if
necessary and wait until the temperature of the clutch drops to a normal work temperature
of approximately 40°C (104 °F) before continuing work. If the clutch overheats it will slip more
easily, thus increasing disc wear.
* With L = 26 mm the springs (R) will be completely coil bound and the clutch cannot operate.
Never work with springs fully locked as this risks deteriorating drive line components if an
obstruction jams the rotor. Always loosen it by at least half a turn.
NEVER FULLY LOCK THE SPRINGS.
Check clutch setting regularly, especially after the machine hasnt worked for a long time. Completely slacken
off the 6 springs (R) (photo 10) by unscrewing their securing nuts, let the friction plates slip for a few seconds
then retighten springs as explained above (to L = 28 mm).
Note : For easier access when wishing to adjust the slip clutch, we strongly recommend that you firstly remove
the clutch guard. Do not forget to replace the guard after adjustment is made.

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The rotor speed of the EL 50 N is 212 rpm with a P.T.O. speed of 40 rpm.
No other PTO speed is allowed.
USE
BEFORE ADJUSTING, MAINTAINING OR REPAIRING THE MACHINE, TURN OFF THE
ENGINE, REMOVE IGNITION KEY AND WAIT UNTIL ALL MOVING PARTS HAVE COME TO
A COMPLETE STOP.
The tilth varies with the work required. The degree of tilth is governed by combining the following factors :
- rear shield position, regulated by suspension chain,
- forward speed,
- working depth,
- mounting of 2 or 3 pairs of blades,
- number of passes.
Coarse tilth :
- Rear shield up
- Fast forward speed (approx. 2. mph - 4 km/h)
- 2 pairs of blades.
Fine tilth :
- Rear shield down
- Slow forward speed (approx. ?? mph - 2 km/hr)
- 3 pairs of blades.
ROTOR SPEED

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H nts on use :
- Allow the rotor to rotate at ist working speed before engaging it into the soil. Gradually lower the machine while
pulling forward with the tractor.
- Always work in a straight line. When turning, lift machine out of work.
- Never work in reverse, otherwise damage could occur to some component parts.
- Do not disengage the PTO drive unless the machine has been lifted out of work.
Important remarks :
Like many farm machines, the use of the EL 50 N entails limits which must be respected in all situations. These
limits are often tied in with :
- meteorological conditions : avoid working during and immediately after rainfall, wait until ground to be worked
is completely drained,
- soil ty es : smooth clods indicate too malleable or too humid soil to be worked in. Wait until ground is completely
drained. Soil consistency is ideal when clods crumble without sticking,
- tractor ower : adapt share depth, working depth and forward speed to power available and type of work to be
done.
Never exceed the maximum allowable tractor DIN power : 36 kW ( 0 hp).

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OPTIONAL ACCESSORIES
1° WHEEL ASSEMBLY - K t No 120 6660
The EL 50 N can be equipped with a gauge wheel kit
to control working depth.
Wheels (R) can easily be adjusted in height inside
their supports using pins (E). To avoid any risk of
accident, don't forget to install safety pins (A).
2° SKIDS + STAND
K t No 120 6960
The EL 50 N may also be equipped with a set of two skids to be mounted on each side of the machine for setting
and adjusting the rotor working depth. The skids are attached to the front of the machine with bolts (R) (torque
21 daNm / 155 ft.lbs) and to the rear of the machine with the holed bars (D) and bolts (S) (torque 21 daNm
/ 155 ft.lbs).
Depth control is adjusted by means of the holed skid bars (D) (photos 11 and 12).
A stand (C) is supplied with the skids to ensure stability when machine is parked (photo 12).
To avoid any risk of accident, don't forget to install safety bolt (U) (photo 12).
Note : Bolt (R) attaches the front guards (T) and the skids simultaneously (photos 11 and 12).
3° P.T.O. SHAFT WITH FRICTION SLIP CLUTCH
K t No 4500 600
This equipment is available as an option for EL 50 N - 92 / 105 / 117 / 130 (see page 1 for set up instructions).