Mandam GAL-K User manual

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MANDAM Sp. z o.o.
ul. Toruńska 14, 44-100 Gliwice, Poland
e-mail [email protected]
Phone: [phone] Fax: [phone]
NIP (Tax ID): 648 000 16 74 REGON (Registration no.): P – 008173131
INSTRUCTION MANUAL
GAL-K, GAL-K HD disc harrow
Issue IV
Gliwice 2022

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EC DECLARATION OF CONFORMITY
FOR A MACHINE
In accordance with the Ordinance of the Minister of the Economy dated 21 October 2008 (Journal of Laws No. 199, item
1228)
and the Directive of the European Union no. 2006/42/EC of 17 May 2006
MANDAM Sp. z o.o.
ul. Toruńska 14
44-100 Gliwice
hereby declares at its sole responsibility that the following machine:
under this declaration, complies with:
the Ordinance of the Ministry of Economy of 21 October 2008 on fundamental
requirements for machinery (Journal of Laws No. 199, item 1228)
and the Directive of the European Union 2006/42/EC of 17 May 2006.
Persons responsible for the technical documentation for the machine: Jarosław Kudlek, Łukasz
Jakus
ul. Toruńska 14, 44-100 Gliwice, Poland
For assessment of compliance the following standards have been applied:
PN-EN ISO 13857:2010
PN-EN ISO 4254-1:2016-02
PN-EN ISO 12100-1:2005/A1:2012
PN-EN ISO 12100-2:2005/A1:2012
PN-EN 982+A1:2008
This EC Declaration of Conformity shall be cancelled if the machine is modified or redesigned
without consent of the manufacturer.
………………………………………
………………………………………
Place and date of issue
First and last name, position held and
signature of the person authorized
GAL-K / GAL-K HD DISC HARROW
type/model: ……………………………..
year of manufacture:...............................
serial number: ………………….

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1. Introduction..................................................................................................................................4
1.1. Safety symbols and inscriptions............................................................................................5
2. General information .....................................................................................................................7
2.1. Construction of the GAL-K disc harrow...............................................................................7
2.2. Intended use of the GAL-K and GAL-K HD disc harrow ....................................................9
3. General safety information.............................................................................................................10
3.1. Hitching and unhitching to a tractor........................................................................................11
3.2. Tyres ....................................................................................................................................11
3.3. Hydraulic and pneumatic systems.......................................................................................11
3.4. Transport safety on public roads .........................................................................................11
3.5. Residual risk description .....................................................................................................12
3.6. Residual risk assessment .....................................................................................................12
4. Information on operation and use ..............................................................................................12
4.1. Preparation of the disc harrow.............................................................................................14
4.2. Hitching the harrow with the tractor ...................................................................................15
4.3. Hitching the sower with the disc harrow.............................................................................16
4.4. Operation and adjustment....................................................................................................16
4.4.1 Automatic locking of the machine side extensions (optional).....................................16
4.4.2 Implement opening sequence.......................................................................................17
4.4.3 Setting the working units .............................................................................................20
4.4.4 Working depth of the GAL-K disc harrow ..................................................................29
4.5. Rules for transporting the harrow on public roads, lights ...................................................31
4.6. Maintenance and lubrication ...............................................................................................33
4.7 Screw tightening torque ...............................................................................................................33
5. Maintenance of the GAL-K disc harrow....................................................................................34
5.1 Hitch damping kit operation guide...........................................................................................36
5.1.1 Assembly...........................................................................................................................37
5.1.2 Service...............................................................................................................................38
5.2 Chassis damping system ..........................................................................................................39
6. Replacement procedures ............................................................................................................41
7. Storage of the disc harrow .........................................................................................................42
8. Disassembly and withdrawal from service and scrapping .........................................................43
9. GAL-K disc harrow - spare parts...............................................................................................43

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1. Introduction
Congratulations on your purchase of the GAL-K disc harrow.
This instruction manual contains the information on hazards that may occur during
operation, work with the device, technical data and the most important guidelines and
recommendations to be known and applied to ensure a proper operation. Keep this manual
for future reference. Should you have any problems with understanding any statement in
the instruction manual, please contact the manufacturer.
The following mark indicates the guidelines that are important due to safety reasons:
Machine identification
Identification data of the GAL-K disc harrow, including basic information on the
manufacturer and the machine and CE marking, can be found on the rating plates placed
on the load-bearing frame.
The warranty for the harrow is valid for 12 months from the date of sale.
The warranty card constitutes an integral part of the machine.
Always provide the serial number when submitting inquiries for spare parts.
For more information on spare parts:
•please visit our website at: http://mandam.com.pl/parts/
•call us at [phone]
•e-mail us at: [email protected]

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1.1. Safety symbols and inscriptions
CAUTION! Special care must be taken when using the implement in case of areas
marked with special information and warning signs (yellow stickers).
The following symbols and inscriptions can be found on the implement. Secure the signs
and inscriptions against loss and make sure they are legible at all times. If lost and
illegible, replace the signs and inscriptions with new ones.
Table 1. Information and warning signs
Safety sign
Meaning of the safety sign
Location on the implement
Read the instruction manual
prior to operating the
implement.
Frame adjacent to the
mounting place of the upper
fastener
Danger of toe or foot crush
Frame adjacent to the
mounting place of the upper
fastener
Keep clear from lift bars
while controlling the lift
Frame adjacent to the
mounting place of the upper
fastener
Keep clear from foldable
and moving parts of the
implement
Front part of the mid frame
adjacent to side frames

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Safety sign
Meaning of the safety sign
Location on the implement
Do not reach into the
crushing zone if the
elements might move
Middle frame adjacent to
side frames
Pressurized fluid – hazard of
bodily injury
Cylinders
Fixing point for transport
belts
Upper part of the drawbar
(upper fastener bolt)
Rear part of the frame:
•rigid frame (adjacent
to the roller depth
adjustment)
•foldable frame
(adjacent to the
cylinder bolt on the
mid frame)

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2. General information
2.1. Construction of the GAL-K disc harrow
The harrows are available in 4,0m; 5,0m; 6,0m; 8,0m; 10,0m; 12,0m working width
Fig. 1 GAL-K disc harrow

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Fig. 2 GAL-K HD disc harrow

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Table 2. GAL-K disc harrow type
Harrow type
Working
width [m]
Tined disc
diameter [mm]
Number of
discs [pcs]
Min. tractor
power [hp]
Wheel size
Weight [kg]
GAL-K 4.0H
4
560
32
150
480/45-17”
3448
GAL-K 5.0H
5
560
40
180
480/45-17”
3852
GAL-K 6.0H
6
560
48
200
480/45-17”
4314
GAL-K 8.0H
8
560
64
220
480/45-17”
5576
GAL-K 10.0H
10
560
80
680
480/45-17”
8500
GAL-K 12.0H
12
560
96
420
480/45-17”
9200
Table 3. GAL-K HD disc harrow type
Harrow type
Working
width [m]
Tined disc
diameter [mm]
Number of
discs [pcs]
Min. tractor
power [hp]
Wheel size
Weight [kg]
GAL-K 4.0H HD
4
560
32
160
480/45-17”
3699
GAL-K 5.0H HD
5
560
40
190
480/45-17”
4195
GAL-K 6.0H HD
6
560
48
210
480/45-17”
4574
2.2. Intended use of the GAL-K and GAL-K HD disc harrow
The disc harrow is designed for post-harvesting (with crushed straw) and pre-sowing
cultivation in both plough and ploughless technology. The implement can also be used for
mixing aftercrop.
The working elements are tined discs with the diameter of Ø560 mm in two shifted
rows mounted on maintenance-free bearings. Equipping each disc with its own bearing
allows for an optimum inclination of the disc in relation to the direction of travel and the
ground. This allows the stubble to be accurately cut and ensures that the post-harvesting
crop residues are evenly mixed and ground. As a result, evaporation of the soil is
interrupted, plant residues decompose more quickly and the intensity of phenolic
compounds, which have a negative impact on the development of successive crops, is
reduced. Disc tines help to penetrate the ground. A roller at the rear of the implement
compacts the soil, resulting in faster germination of weeds and self-sown plants. The use
of a disc harrow before sowing ensures a precise mixing of fertilizers with the soil, an even
surface, and an appropriate soil structure.
The HD version of GAL-K (GAL-K HD) is equipped with a double hydraulic servomotor folding
system.
A drawbar-mounted support foot is available as an option for horizontal positioning of the
harrow during storage or maintenance operations.
The harrow can also be equipped with a hydropack for coupling with a sower.
GAL-K units are equipped with their own driving system with a braked axle. The pneumatic
system is used for this purpose.
CAUTION! MANDAM grants a 5-year warranty on maintenance-free hubs
subject to the following conditions:
- the principle is observed of the working disc replacement in case of their
wear, which may not exceed the diameter of 490 mm for Ø560 mm and 550
mm discs,
- original MANDAM discs are used,
- the permissible working depth, which is 12 cm for Ø560 mm discs and 15
cm for Ø610 mm, is not exceeded,

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- the principle is observed of no turning manoeuvre of the harrow when it is
in the working position (working discs recessed in the soil).
CAUTION! The disc harrow is designed for agricultural use only. Using the
implement for tasks that differ from the intended use shall be regarded as
misuse, resulting in loss of warranty. Failure to follow the guidelines included
in this instruction manual shall also be regarded as misuse.
CAUTION! The manufacturer shall not be liable for any damage arising out of
misuse.
3. General safety information
The disc harrow can be started, operated, and repaired only by persons familiar
with its operation and with the operation of the attached tractor as well as knowing the
rules of safe operation and maintenance of the implement.
The manufacturer shall not be liable for any unauthorised alternation of the harrow.
Only genuine MANDAM spare parts shall be used during the warranty period.
The disc harrow must be operated with all precautionary measures and due care, in
particular:
•before every start-up check the disc harrow and the tractor, make sure that their
conditions guarantee safety of traffic and operation,
•minors, disabled or intoxicated persons (under the influence of alcohol or drugs)
must not operate the machine,
•during operation and maintenance wear working clothes, footwear, and gloves,
•do not exceed the maximum axle loads and transport dimensions,
•use only original cotter pins and pins,
•do not approach the disc harrow while lifting or lowering,
•do not stay between the disc harrow and the tractor when the engine is running,
•drive away with the implement, lift, and lower it slowly and smoothly, without
jerking, making sure no outsiders are in the area,
•do not reverse and make U-turns when the implement is lowered to the working
position,
•when making U-turns do not use independent tractor brakes,
•during the operation and travel do not stand on the implement and do not put
additional loads onto it,
•while making U-turns, pay due caution if anyone is in the vicinity,
•never use the roller on slopes with the inclination exceeding 12°,
•any repairs, lubrication or cleaning of working components may be performed as
long as the engine is not running and the unit is lowered and unfolded,
•there is a hazard of head injury when you perform maintenance or replacement of
parts in or under the implement without adequate protection – wear a hardhat,
•during a break in the work, always lower the implement to the ground and stop the
tractor engine,
•the harrow with the working width exceeding 3.00 m is equipped with a mechanical
lock which blocks the side extensions from uncontrolled opening during standstill
and road travel,
•driving and parking the implement on an unstable slope may cause soil slipping,
store the implement in a manner preventing injury to people and animals.

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3.1. Hitching and unhitching to a tractor.
•Hitch the implement with the tractor according to the recommendations, use pins
and protect the pins with cotter pins.
•When hitching the disc harrow, do not stay between the tractor and the attached
implement.
•The tractor with the hitched disc harrow must be in good working order. It is
forbidden to couple the machine to any tractor with a malfunctioning pneumatic
system (if the machine has a braked axle) and hydraulic system.
•Remember to observe the following: balance of the tractor and the suspended
implement, tractor steerability and braking performance – the front axle load must
not drop below 20% of the total tractor load – a kit of front weights;
•When in resting position and disconnected from the tractor, the machine must be
stable all the time.
•Place the support leg on a stable ground. Do not use pads under the leg as this may
cause instability.
3.2. Tyres
•Tyre pressure cannot exceed the value recommended by the manufacturer.
Transporting the implement when the pressure is too low is prohibited. This may
cause damage to the implement or an accident when travelling too fast and on very
uneven surfaces.
•Considerably damaged tyres (particularly the tyre profile) must be replaced
immediately.
•Protect the implement from rolling away when replacing the tyres.
•The repair works on wheels or tyres must be performed by persons trained and
authorised for this purpose. Such works must be performed with properly selected
tools.
Following every assembly of wheels, check the tightening of nuts after travelling the
distance of 50 km.
3.3. Hydraulic and pneumatic systems
The hydraulic and pneumatic systems are pressurised. Take all precautionary measures,
in particular:
•do not connect and disconnect hydraulic hoses when the tractor hydraulic system is
pressurised (hydraulics set to neutral),
•regularly check the hydraulic and pneumatic connections and hoses,
•do not use the implement until the hydraulic or pneumatic system is repaired.
3.4. Transport safety on public roads
For the period of transport, the side sections of the disc harrow must be put in transport
position using the hydraulic system. Before folding, the machine must be lifted sufficiently
high until the folded side sections do not collide with the ground.
The disc harrow must be protected against unfolding by means of the mechanical lock.
Lower the wheels so that the side sections do not collide with the ground during folding.
While in transport, the clearance under the machine must be at least 30 cm.
While transporting the implement on public roads, it is absolutely mandatory to use lights,
an identification sign and reflective side lights.
Do not exceed the maximum travel speeds:

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–up to 20 km/h on smooth (asphalt) roads,
–6-10 km/h on country roads or cobblestones,
–up to 5 km/h on bumpy roads.
After folding the machine, slide the rollers together and secure them with bolts in the
ladders in order to achieve a smaller transport width.
Travelling speed must be adapted to the road and the existing conditions so that the disc
harrow cannot jump on the tractor suspension system and excessive loads on the machine
frame and the tractor suspension system can be avoided.
Act with due caution when passing and overtaking or travelling at curves. The maximum
implement width on public roads is 3.0 m.
Do not drive with the implement if the slope is inclined crosswise to the implement by
more than 7°.
WARNING! Any failure to observe the above rules may pose hazard to the
operator and other people. It may also result in damaging the machine. The
user shall be liable for any damage caused by failure to observe the rules!
3.5. Residual risk description
Mandam Sp. z o.o. makes every effort to eliminate the risk of accidents. However, there
is some residual risk that may cause an accident. The biggest hazard occurs when/during:
•using the implement for purposes other than described in the manual,
•operating the implement by people who are underage and do not have licences,
are ill or intoxicated,
•presence of people and animals within the implement operating range,
•precautionary measures are not taken during transport and maneuvering with the
tractor,
•anyone gets between the implement and the tractor while the tractor’s engine is
running,
•maintenance and when the service recommendations are not observed,
•driving on public roads.
3.6. Residual risk assessment
The residual risk can be minimized by applying the following recommendations:
•operate the implement carefully and without undue haste,
•read the instruction manual carefully,
•keep a safe distance from hazard zones,
•do not stay on the implement and within the implement operating range when the
engine is running,
•perform the maintenance in accordance with safety rules,
•wear safety clothes and a safety helmet while working under the implement,
•unauthorised persons, in particular children, are prevented from accessing the
machine.
4. Information on operation and use
Before the machine is put into operation for the first time:
•read the instruction manual,

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•make sure that the machine is in proper operating condition,
•check the condition of the hydraulic and pneumatic system (replace damaged
components, e.g. pressure hoses),
•make sure that the hydraulic hose quick-connector of the machine match the
tractor sockets,
•check the tightening of bolts and nuts,
•check if the air pressure in tyres is according to the manufacturer’s
recommendations,
•make sure that all components requiring lubrication are lubricated,
•make that the pressure in the tractor wheels is the same on all axles to ensure
smooth operation.
CAUTION! The permissible loads on the axles and tyre load capacities must
not be exceeded. The front axle load may not be less than 20%.
Axle load calculations
Key:
GC – the tractor weight,
TP – front axle load for the unhitched tractor,
TT – rear axle load for the unhitched tractor,
GT – total weight of the equipment attached at the back,
GP – total weight of the front-mounted machine,
a – distance between the centre of gravity of the front-mounted equipment and the axle
centre,
b – tractor wheelbase,
c – distance between the rear axle centre and the centre point of the hitching pin of the
rear-mounted implement,
d – distance of the centre of gravity of the agricultural implement from the hitching pins
of the tractor,
x – distance of the centre of gravity from the rear axle (assume 0.45 if the manufacturer

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does not provide this parameter).
Minimum load at the front in case of a rear-mounted implement:
Actual load on the front axle:
Actual total weight:
Actual load on the rear axle:
4.1. Preparation of the disc harrow
The disc harrow is usually supplied for sale in a ready-to-operate condition. Due to the
limitations of the means of transport, it is also possible to deliver it in a partially
disassembled condition - usually by disconnecting the roller.
When preparing the unit for operation for the first time, its components (roller) must
be assembled. To this end, place the disc harrow on a flat hard surface in a position where
the roller can be maneuvered. A lifting device with a load capacity of at least 500 kg in
(700 kg in the case of a rubber roller) must be used for transporting the roller to ensure
stability during transport. Position the arms in the harrow holders and connect the arms
to the roller bracket using screws (Fig. 4).

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Fig. 4. Arm and roller bracket connection
Prior to operation check the technical condition of the disc harrow, in particular that of
the working parts and screw connections.
CAUTION! The correct procedure for mounting the rollers in the arm
brackets requires that the screws are tightened evenly diagonally so that
the entire plane of the arm brackets is flush with the plane of the roller
clamp profile. This provides the most secure way of connecting the roller
arms to the machine!
4.2. Hitching the harrow with the tractor
Tyre pressure in the tractor wheels must comply with the values recommended by the
manufacturer. The lower bars of the three-point hitch should be at the same height,
spaced correspondingly to the spacing of the lower points of suspension. While attaching
the disc harrow to the tractor, the harrow must be placed on hard and even ground.
Fig. 3 Three-point hitch of the tractor: 1,2 – lower bars, 3 – upper fastener, 4 – left support rail, 5 – right
support rail with adjustable length, 6 – lift arm, 7 – lift shaft
While attaching the disc harrow to the tractor, complete the following steps:
– switch the tractor hydraulic system into adjustment position,
– uncouple the suspension axle from the unit and attach it to the tractor’s lower bars,

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– reverse the tractor to a distance that allows the suspension axle to be connected to
the frame plates
and the upper fastener and harrow support rail,
– secure the suspension axle in the frame plates using the clamps and pins,
– attach the tractor’s upper fastener. During operation of the unit, the hitch point of the
upper fastener at the unit must be higher than the attachment point of this fastener at
the tractor.
- check the lifting and lowering of the unit.
Each tractor connected to the machine must be equipped with a set of weights and
maintain control during transport, i.e. a minimum of 20% of the tractor’s weight
must be transmitted to the front axle of the tractor.
4.3. Hitching the sower with the disc harrow
Before attaching the sower, check the weight of the sower and the seed. The load capacity
of the hydropack is 1,300 kg. When coupling the sower with the disc harrow, proceed as
follows:
•adjust the distance between the hooks to the distance between the sower hitch
bolts by placing the hook on the proper side of the arm and putting the spacer,
•lower the lower bars of the coupling below the sower hitch bolts (in case of the
coupling on a trolley, insert the bolt into the corresponding hole in the support rails
of the bar, then adjust the position using the cylinder),
•reverse the set to bring the sower bolts into the hooks,
•place the protection cover on the bolts and the hook hole and secure with a pin,
•connect the upper fastener with the sower.
CAUTION! Before lifting the disc harrow, the sower must be lifted to ensure
the stability of the unit.
4.4. Operation and adjustment
4.4.1 Automatic locking of the machine side extensions (optional)
As an option, a harrow version with automatic side extension lock is also available,
which does not require any additional maintenance. The lock uses a mechanism
consisting of a cylinder and a hook (Fig. 5).

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Fig. 5 Main frame with automatic side extensions locking mechanism
4.4.2 Implement opening sequence
Before unfolding the folding side the extensions of the machine, learn the opening
sequence to perform this operation correctly.
1. First, raise the implement as much as possible to be able to fold it correctly,
avoiding the risk of the folding arms catching on the ground during movement
(Fig. 6).
2. Next, fold the implement side extensions hydraulically into the ‘closed’ position
to ensure that the side extension lock mechanism will unlock and allow the
implement arms to be opened at a later stage. This operation is necessary each
time the arms are opened (Fig. 6).

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Fig. 6 Implement opening sequence: 1- raise the implement up to the maximum, 2- fold the side extensions into the
“closed” position.
3. Then, after making sure that the hook of the hydraulic side extension lock
mechanism allows the machine side extensions to be unlocked, proceed to open
them fully (Fig. 7).
Fig. 7 Implement opening sequence: 3- release the hook of the hydraulic side extension lock mechanism, 4- open the
implement side extensions.

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4. When opening the implement’s side extension arms, make sure that the ends of
the arms are at the correct height to prevent them from catching on the ground
(Fig. 8).
Fig. 8 Implement opening sequence: open the implement paying particular attention to the height of the arm ends from
the ground.
5. To complete the opening sequence of the implement side extensions, wait until
the hydraulic mechanism opens the arms to their end position. Do not interrupt
the opening process of the arm side extensions without ensuring that they are
fully open.
Fig. 9 View of the implement at the completion of the side extension opening sequence. The implement arms are fully
open.
CAUTION! On implements with folding side extensions, clean the machine
thoroughly after use so that excessive soil residues do not put additional
strain on the machine side extensions and thus on the cylinders!

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4.4.3 Setting the working units
Pre-set the positions of the individual working units in the GAL-K disc harrow before
working in the field. Also level the machine lengthwise with the tractor upper fastener
or with the drawbar turnbuckle and laterally with the support rail of the right lower bar.
Then, make the first work passage to set the optimum working speed and to correct the
adjustment based on an assessment of the correct operation of the individual units.
Correct positioning of the machine for operation
Position the machine to be used parallel to the ground (See Fig. 10) The front drawbar
must be aligned horizontally. It is forbidden to operate the machine with the drawbar
positioned at an angle!
Correct positioning of the machine for operation:
Fig. 10 Implement positioned correctly parallel to the ground.