SaMASZ FP 20 User manual

SaMASZ sp.z o.o.
Poland, 15-161 Białystok, ul.Trawiasta 15
Established – 1984
Tel. (+48) 85,664 70 31
Fax (+48) 85,664 70 41
e-mail: [e-mail]
www.samasz.pl
OPERATOR'S MANUAL
TREE STUMP GRINDER
FP 20
Suitable for extension arms:
KWT 550/650
IN336EN001
EDITION NO. 1
ENGLISH VERSION
Prepared by: Rafał Radulski
Approved by: Adam Kierkowicz
Original instructions
Białystok 05.05.2011

Apart from this Operator's Manual observe also operator's manual for KWT
550/650 extension arm.
This operator ’ s manual is indispensable part of any tree stump grinder and is to
familiarize future user with principles of proper operation and use of the machine as well as
the risks involved. Before first commissioning of the machine learn thoroughly the content of
this operator's manual and safety advices herein.
Keep this manual for future use.
Tree stump grinder is intended only for grinding tree stumps, bushes and hedges. Any
use other than the above shall be considered as misuse. In order to operate the machine as
intended requirements concerning operation, use and repair as advised by the manufacturer
should be met and followed carefully.
Apart from recommendations concerning the intended use of the machine, pay attention
to its maintenance. Keep it in operational condition. Use original spare parts only.
Tree stump grinder should be operated, serviced and repaired only by personnel who
are trained in technical servicing and familiarized with safety procedures.
Always follow provisions concerning accident prevention, and any basic occupational
health and safety provisions as well as road traffic rules.
Should you have any questions concerning commissioning and operation of the
machine, please contact the manufacturer ’ s service.
The manufacturer shall not be liable for damages resulting from unauthorised repairs
and modifications of the grinder's design without the manufacturer's prior consent.
In the case of resale of tree stump grinder to other user, the delivery of the operator
’ s
manual must be confirmed in writing.
ATTENTION!
Instructions given in this operator ’ s manual marked with this
symbol and warning signs provided on the machine inform about
a risk.
We congratulate you on the purchase of your new SaMASZ tree stump grinder and wish
you much pleasure and the very best experience resulting from its operation.

Operator's manual
TREE STUMP GRINDER
FP 20
- 1-
Table of contents
1. IDENTIFYING THE MACHINE................................................................................................... 2
2. SAFETY PRECAUTIONS.............................................................................................................. 2
2.1 Safety rules..................................................................................................................................3
2.2 Safety labels................................................................................................................................5
2.3 Residual risk................................................................................................................................7
3. USE.................................................................................................................................................... 9
3.1 Intended use and design..............................................................................................................9
3.2 Control ......................................................................................................................................10
3.3 Transport position and drives....................................................................................................10
3.4 Installing....................................................................................................................................11
3.5 Initial adjustment.......................................................................................................................12
3.6 Preparing for operation .............................................................................................................12
3.7 Safe start up and shut down ......................................................................................................12
3.8 Operation...................................................................................................................................12
3.9 Proceedings in case work unit is locked ...................................................................................13
3.10 Malfunctions and their repair....................................................................................................14
4. EQUIPMENT AND FITTINGS ................................................................................................... 15
5. OPERATION.................................................................................................................................. 15
5.1 Maintenance and service...........................................................................................................15
5.2 After-season maintenance.........................................................................................................17
6. MAINTENANCE AND STORAGE............................................................................................. 17
7. TRANSPORT................................................................................................................................. 17
8. SPECIFICATIONS........................................................................................................................ 18
9. DISMOUNTING AND WITHDRAWAL FROM USE.............................................................. 19
9.1 Dismounting..............................................................................................................................19
9.2 Withdrawal from use.................................................................................................................19
9.3 Environment..............................................................................................................................19
10. WARRANTY.................................................................................................................................. 20
10.1 Warranty card............................................................................................................................20
10.2 Warranty terms..........................................................................................................................20
10.3 Warranty repairs record ............................................................................................................21
11. LIST OF PARTS............................................................................................................................ 22

Operator's manual
TREE STUMP GRINDER
FP 20
- 2-
1. IDENTIFYING THE MACHINE
Each tree stump grinder can be clearly identified owing to its data plate, which is attached to
the linkage body as shown below.
Fig. 1. Data plate location
Data plate includes:
A.name of the manufacturer,
B. serial number,
C.machine type,
D.manufacturing date,
E. machine’s weight,
F. quality check sign,
G.CE mark means that tree stump grinder conforms to Directive 2006/42/EC and harmonized
standards.
H.country of manufacture,
I. barcode,
J. version number.
NOTE
Data plate is considered a document. Do not modify its content or make it
illegible.
NOTE
Data plate includes all the necessary information required to contact your
dealer if any questions or doubts arise.
NOTE
When placing an order on spare parts make sure to give name, type, serial
number and manufacturing date of the machine for which these are intended.
2. SAFETY PRECAUTIONS
When operating the mower, comply with Regulation of the Minister of Agriculture and Food
Economy of 12.01.1998 on work safety when operating tractors, machines, technical instruments
and devices used in agriculture Journal of Laws No. 12/98 item 51.)
I
A G
C D J
F E B
H

Operator's manual
TREE STUMP GRINDER
FP 20
- 3-
WARNING!
Tree stump grinder is a device the use of which involves risk. The machine
can only be operated by personnel who have learned this manual.
Each operator of the tree stump grinder should be fully aware of potential risks
resulting from its operation and principles of their prevention.
When operating the tree stump grinder always wear protective clothing and
footwear as well as adequate personal protective equipment:
•Protective helmet
•Ear protection
•Protective gloves
Operator should always have a first-aid kit within his reach
(Journal of Laws No. 12/98 item 51.)
2.1 Safety rules.
Operating
•Before operating the tree stump grinder learn content of this operator's manual and follow
rules provided by the Manufacturer herein (Journal of Laws No. 12/98 item 51.)
•Apart from this operator’s manual follow the instructions as given in the extension arm
operator's manual.
•Do not use the tree stump grinder for any purposes other than its intended use.
•Do not introduce any design modifications without prior arrangements with the Manufacturer.
•Failure to learn the operator’s manual can result in damaging the tree stump grinder.
•The machine must not be operated by minors or handicapped persons.
Attaching
•Mount and dismount the tree stump grinder on an extension arm with the latter mounted on a
tractor, and when the whole aggregation is prevented against moving by the tractor’s parking
brake engaged.
•When connecting hydraulic hoses to the tree stump grinder's nozzles wear protective gear
such as eyewear, gloves and clothing.
•Mount and dismount the tree stump grinder from extension arm on an even and paved surface
while keeping particular attention.
•Tractor's 3-point linkage should be adjusted with tensioning chains, so as to ensure a stiff
connection between the tractor and the extension arm, onto which the tree stump grinder is to
be mounted.
•Tractor with the mounted aggregation of the extension arm and the tree stump grinder should
be balanced so as to provide the stability of the aggregation including the tractor and the
extension arm.
•In order to mount the tree stump grinder on the extension arm use original fittings and safety
devices only.
•When connecting hydraulic hoses to the tractor's hydraulic connectors make sure, that the
hydraulics on either the tractor or the extension arm aggregate are pressure free.
•Before connecting the hydraulics reduce pressure in hoses.
Transport
•When driving on public roads always respect the local traffic regulations concerning warning
lights.

Operator's manual
TREE STUMP GRINDER
FP 20
- 4-
•For transport of the aggregation of arm and tree stump grinder, remove or partially disconnect
the PTO shaft from the tractor’s side.
•While transporting the above aggregation mount remote warning light device and warning
triangle for a slow driving vehicle.
•During transport, always set the tree stump grinder in its proper and safe transport position.
See section 3.3.
•Any modifications in the mower's position are possible only if no vehicles or unauthorized
personnel are around (children in particular).
•Do not drive over 25 km/h (15 mph).
•Drive slower if road conditions are poor, especially on irregular surfaces or steep slopes.
•While transporting, if hydraulics are damaged, the extension’s arm cylinder should be
protected with a special lock (channel section on the cylinder’s rod).
Operation
•When operating on public roads always respect the local traffic regulations and provisions
concerning warning lights.
•Admissible slope, on which the machine is able to operate is provided by the Manufacturer.
Angular value for safe operation on slope is
°
8(Journal of Laws No. 12/98 item 51.)
• Unauthorised personnel and animals should keep away from the grinder for a safe distance,
which is at least 10 m from the machine. Keep particular attention when operating near roads
and lanes, where presence of unauthorized personnel is likely (Journal of Laws No. 12/98 item
51.)
• When operating the aggregation of arm and grinder, make sure the tractor is always equipped
with operator's cabin.
• Before operating, the machine should undergo a technical inspection. Pay particular attention to
the condition of basic connections of the machine’s assemblies as well as proper mounting of
the machine to the tractor.
• Each time before operating, check condition of the cutting knives along with cutting disk, and
if need be, deliver it for recovery or replace.
• Before starting the tractor, make sure that all drives are disconnected and control levers for
hydraulics are in neutral position.
• Before moving, make sure whether there are no unauthorised personnel directly nearby the
machine, give an acoustic signal.
• Never leave the tractor’s engine running without any supervision. Before leaving the tractor,
turn the drive off, set the aggregation of tractor and extension arm and the tree stump grinder in
a standstill position and remove the ignition key (Journal of Laws No. 12/98 item 51.)
• For any break in the machine operation, disconnect the drive (Journal of Laws No. 12/98 item
51.)
• Tree stump grinder should be operated with the PTO shaft running at 700-1000 rpm (applicable
for the SaMASZ extension arm).
• Perform any manoeuvring of the tree stump grinder only from the operator’s seat. Do not
control the machine from outside the tractor’s cabin.
• Operate the grinder only when the tractor is not moving, and move the grinder only by the
extension arm and adjust the operation to conditions such as size and number of tree stumps to
be ground.
• Do not operate the tree stump grinder after dusk.
• Do not leave the aggregation of tractor and extension arm on slopes or other inclinations
without providing any additional protection.
•
Do not operate with damaged or missing guards (Journal of Laws No. 12/98 item 51.)
Inspection and repair

Operator's manual
TREE STUMP GRINDER
FP 20
- 5 -
• Perform any inspection, repair and maintenance works as well as cleaning parts or assemblies
when the drive is switched off and there is no pressure in the hydraulics, having taken the
ignition key off and set the aggregation of tractor and machine in a standstill position (Journal
of Laws No. 12/98 item 51.)
• Inspect bolts and other fasteners regularly. Do not operate with damaged or worn fasteners.
• Do not operate with damaged or worn fasteners. When the rubber guard shows signs of
ageing (e.g. microcracks over the surface), it should be replaced.
• Do not perform any repair works underneath the lifted machine’s assemblies, unless protected
against free falling (Journal of Laws No. 12/98 item 51.)
• Replace damaged or worn (aged 5 years or older) hydraulic hoses and other hydraulic parts as
recommended by the Manufacturer.
• Before any operation, check the condition of cutting knives. If blunt, rotate the knife by 1/3
turn (3 sharp cutting edges per a single knife can be achieved), or handle it for a recovery.
Damaged or worn blades must be replaced.
• Use only original spare parts ordered at our store or at your dealer.
• During operation, maintenance and adjustment, always wear protective gloves, shoes and
clothing without loose elements, belts, etc. Always respect warnings on safety labels attached
to the machine.
• When operating the hydraulics, always wear protective eyewear and gloves. Hydraulic oil
leaking under pressure (16 MPa) may penetrate the skin and cause its irritation thereafter. In
such case, visit a doctor immediately.
• In the event of a serious failure, please call for technical service, and if an accident (in this
case: road accident) occurs, respect first aid rules and contact responsible authorities.
Storage
• Tree stump grinder should be stored under a roof and protected against access of animals and
unauthorised persons who could get injured.
Transport
• Both the driver and the carrier are responsible for the grinder's safe transport. Any equipment
and parts must be secured for transport.
• Using lifting devices grab only stiff elements on the grinder such as housing and mounting
plate.
• In order to lift the machine, use only lifting devices of hoisting capacity bigger than the
grinder’s weight provided on the data plate.
• On the vehicle's trailer, the tree stump grinder should be protected against moving.
NOTE
The person in charge of the machine's transport shall be responsible for
securing the danger area and performing the work.
2.2 Safety labels
NOTE
Always follow the safety labels describing risks, and warning signs attached
to the machine.
NOTE
•All warning labels should be clean and legible.
•Lost or damaged labels must be replaced.

Operator's manual
TREE STUMP GRINDER
FP 20
- 6 -
• New labels can be ordered at the Manufacturer.
NOTE
Spare assemblies used for the grinder repair should hold all warning labels
provided by the manufacturer.
Table 1. Warning labels on tree stump grinder
Warning label Meaning Id no.
Before use read the
operator ’ s manual.
1
N-3
Disconnect the machine
before approaching any
service or repair works.
2
N-4
Operating is forbidden
when any person is within
the danger area of 10 m.
3
N-7
Caution: rotary
parts
4
N-106
Do not operate the grinder
within less than 10 m from
power lines.
5
N-23

Operator's manual
TREE STUMP GRINDER
FP 20
- 7 -
Warning label Meaning Id no.
Danger of crushing
6
N-99
Do not remain in machine ’ s
swinging area
7
N-49
Table 2. Mandatory signs to be followed when performing service and repair works.
Wear protective eyewear 1
N-100
Wear protective gloves 2
N-52
Wear protective clothing 3
N-101
Wear
protective helmet
4
N-102
Wear
ear protection
5
N-103
2.3 Residual risk
NOTE
Despite the fact, that SaMASZ company – Manufacturer of the tree stump
grinder takes responsibility for the machine's design and manufacturing, in
order to eliminate risk, certain elements of residual risk when operating the
grinder are unavoidable.

Operator's manual
TREE STUMP GRINDER
FP 20
- 8 -
NOTE
Present residual risk results mainly from erroneous actions taken by an
operator of the tree stump grinder and failure to follow rules provided herein.
NOTE
When describing residual risk, the tree stump grinder shall be considered a
machine, which until the moment of its production had been designed and
manufactured in accordance with the state-of-the-art as per its manufacture
date.
Danger of catching
This kind of risk is present when position of tree stump grinder is being changed, as a result
of operating near rotating parts.
Danger of cutting limbs off
Contact between cutting knives and body may lead to serious injuries, and in extreme cases
amputation of limbs or even death. Failure to pay enough attention when operating the machine
nearby unauthorized personnel may cause an accident.
Danger of wound
This risk is present when replacing working parts with sharp edges. During any maintenance
and repair works, always wear safety gloves.
Danger of kick
Kick is one of the most dangerous accidents which are likely when operating tree stump
grinder. It is described as uncontrolled, sudden and very quick motion of an object or part of it
being processed (splinter, knurl, etc.). Direct impact of the material against human body may cause,
depending on the material weight and size, as well as speed and the impact location, bruises,
injections, loss of an eye, teeth, or even death due to damage to organs and vast internal
haemorrhages.
Danger of causing irritation to skin and eyes
When connecting/disconnecting hydraulic hoses to/from tractor’s hydraulic connectors make
sure, that both the tractor’s and the extension arm’s hydraulics are pressure free. Otherwise, leak of
oil under pressure of approx. 20 MPa may occur. It also applies to damaged hoses. Therefore, when
operating the hydraulics, make sure to always wear protective gloves and eyewear. Regularly check
hydraulic hoses for leaks.
PROHIBITED ACTIONS
Bear in mind the following prohibited actions when operating tree stump
grinder.
• Do not remove impurities, make any adjustments or repairs when the grinder is operating.
• Never change the sequence of operation and maintenance works as specified herein.
• Never use the tree stump grinder, if it is not in operating condition.
• Never get near the machine’s operating parts.
• During repair and maintenance works at tree stump grinder, always follow descriptions
included herein, and perform them when the tractor’s drive is turned off.
• Before any works, focus your attention solely on the tasks to do.
•
Never operate the tree stump grinder when being under the influence of alcohol, drugs or
medicines which impair your motor skills.
• Tree stump grinder cannot be operated by unauthorized and unskilled personnel.
• Tree stump grinder cannot be operated by minors and handicapped persons.

Operator's manual
TREE STUMP GRINDER
FP 20
- 9 -
• When operating the tree stump grinder, observe whether there are no unauthorized personnel
and animals around.
3. USE
3.1 Intended use and design
Being an additional equipment of an extension arm, the tree stump grinder is intended for
works near roads and in orchards for grinding tree stumps, bushes and hedges. Using the grinder
tree stumps of any diameter can be ground, however within the machine's maximum feed rate and
capacity. Do not use tree stump grinder for grinding non-wooden materials! Tree stump grinder FP
20 is designed to cooperate with the following extension arms:
• KWT 550 – 5.50 m
• KWT 650 – 6.50m
The grinder can be mounted also on other type of extension arm with the same type of a
mounting plate or any other upon its previous adaptation.
Fig. 2. Mounting plate for tree stump grinder
Table 3. General description of tree stump grinder.
Characteristic parameters FP 20
Working diameter [m] 0.4
Weight [kg] 90
Cutting knife count [pcs] 16
Tree stump grinder comprises a fixed housing combined with a mounting plate to make a
single piece, and a movable cutting disc with replaceable cutting knives of cemented carbide
mounted on holders. The disk is mounted on engine’s shaft, which is bolted to the housing.
On the mounting plate, there are 12 boreholes for mounting, 6 holes each (arranged as in Fig.
2 ) for attaching an extension arm what enables setting the grinder in 4 positions in relation to the
arm, by rotating it by 90˚ on the retaining pin axis. Working principle and manner of connecting
according to hydraulic scheme are provided in Fig. 3.1 .

Operator's manual
TREE STUMP GRINDER
FP 20
- 10 -
Fig. 3. Tree stump grinder FP 20
– 0.4 m
Description of branch grinder and working principle.
A. – Mounting plate. E. – Hydraulic engine.
B. – Grinder housing. F. – Nozzles of hydraulic hoses.
C. – Cutting disk. G. – Support leg.
D. – Cutting knife with knife holder. H. – Rubber guard.
Fig. Hydraulic scheme
Fig. 3.1. Hydraulic scheme
3.2 Control
Tree stump grinder is controlled with the extension arm control panel.
3.3 Transport position and drives
Transport position of tree stump grinder aggregated with SaMASZ extension arm corresponds
to the arm's transport position. See Fig. 4 .
When mounting the tree stump grinder on other type of extension arm, fold the tree stump
grinder aggregated with the arm in the position as compact as possible.
• To transport the aggregation of arm and grinder, use any protective means as intended for control
and design of the extension arm.
•
Dismount the PTO shaft for transport. Provide proper marking and lighting of the aggregated
machines for a low-speed vehicle to comply with road traffic provisions.
• Driving speed should always be adjusted to current road conditions.
F
H
G
C
D
E
A B

Operator's manual
TREE STUMP GRINDER
FP 20
- 11 -
• Transport speed on public roads cannot exceed the mean speed of 25 km/h (15 mph).
Fig. 4. Tree stump grinder in transport position
3.4 Installing
In order to mount tree stump grinder on extension arm do the following in a sequence:
• place pallet with tree stump grinder on an even and paved ground,
• drive the tractor with the attached extension arm and position the mounting plate of the arm so
it matches the grinder's mounting plate. In the case of inaccurate positioning of the arm against
the grinder, it can be moved using holes drilled on the housing sides and either steel bar or
tube.
• secure the tractor against moving,
• shut off the engines and remove the ignition key,
• mount the grinder's mounting plate on the arm's mounting plate with the grinder's mounting
plate retaining pin and secure with a spring cotter, and then bolt the grinder's mounting plate to
the arm's mounting plate with 6 bolts and M14 nuts. With use of the pin it is possible to rotate
the tree stump grinder in four directions against the arm, having previously removed bolts and
nuts, without dismounting the grinder from the arm completely,
• connect hydraulic hoses using push-in fittings while paying particular attention so that the
grinder ’ s supplying hose is connected to the supply connector P(+) of the extension arm and the
grinder ’ s return hose to return connector T(-) of the extension arm ( Fig. 6 ),
Fig. 6. Markings of hydraulic hoses on tree stump grinder

Operator's manual
TREE STUMP GRINDER
FP 20
- 12 -
• lift up the connected tree stump grinder slightly above the pallet and check all bolt connections
(according to Table 5) and whether there are no apparent damages.
• pre-start the tree stump grinder in order to check whether connections and operation are correct.
NOTE!
When connecting and inspecting the tree stump grinder, follow any and all
safety conditions provided herein.
3.5 Initial adjustment
Tree stump grinder is factory adjusted and requires no additional adjustments.
If any signs of improper operation of the grinder are found, please contact the Manufacturer's
service.
3.6 Preparing for operation
Before operating the tree stump grinder do the following:
• thoroughly examine the tree stump grinder for operational condition, plays and damages. Pay
particular attention to condition of bolt connections on cutting knives,
• remove any guards, locks and safety devices mounted on the aggregation of extension arm and
tree stump grinder,
• connect the PTO shaft to the tractor,
• having made sure there is no unauthorized personnel around, start tree stump grinder with no
load and reach the pre-set PTO rpm rate, and then shut down and check for tightness,
• if the tree stump grinder's condition and its idle operation raise no doubts, start operating.
3.7 Safe start up and shut down
Before operating make sure there are no unauthorized personnel or animals within the range
of 10 m. Next set the grinder in the mean working position and start it afterwards.
Before stopping tree stump grinder terminate grinding by lifting it up above the stump being
ground Then, turn off the machine’s drive so in result any manoeuvring actions with extension arm
can be started in order to set the aggregation of extension arm and tree stump grinder to transport
position.
3.8 Operation
In order to ensure proper high-quality operation, as well as to maintain tree stump grinder's
durability follow these rules:
• respect work safety and traffic rules solely,
• keep hydraulic oil consumption for ditch cleaner’s supply pump at max. 70-100 l/min. For
SaMASZ extension arm such demand is achieved at tractor’s PTO shaft rpm of 700-1000 rpm,
Before operating, in order to ensure accurate arm control and grinder's non-overloading
condition, stop the tractor and engage its parking brake
• it is advisable that before operating the operator sets the grinder so that its mounting plate (item
A in Fig. 3 ) is horizontal, and the extension arm – so that the distance between the grinder and
the tractor is approx. 1.5 - 2.5 m (see Fig. 5 ), what should ensure good view on the grinder and
accurate control over it,
•
having set the grinder and the extension arm as provided in Fig. 5 , start the grinder and lower it
slowly onto the tree stump height,

Operator's manual
TREE STUMP GRINDER
FP 20
- 13 -
• the essence of operating the tree stump grinder is to move it so as to touch one side of the tree
stump with the rotation of the whole extension arm, and lower the grinder only after the entire
width of the tree stump is ground,
• to make the arm's control more accurate, adjust choke valves with knobs on cylinders.
3.9 Proceedings in case work unit is locked
• lower adaptor onto the ground,
• perform any works at the machine only with its drive turned off and no pressure present in the
hydraulics,
• remove the ignition key and secure the vehicle against uncontrolled movements or unintended
start up,
• wear protective gloves and remove the part which causes the machine's locking.
Fig. 5. Tree stump grinder with attached arm in working position

Operator's manual
TREE STUMP GRINDER
FP 20
- 14 -
3.10 Malfunctions and their repair
Table 4. Defects, causes and their repair
No. Defect Reason Repair
1. Tree stump
grinder is not
grinding
Damaged or blunt cutting knives Turn the knife by 1/3 turn (special
relieves on the knives), handle for
recovery or replace
Too low PTO rpm Switch rpm to 1000 rpm, increase
engine ’ s rotary speed.
Worn, damaged hydraulic engine Recover hydraulic engine or replace
Damaged or torn bolts securing
hydraulic engine Replace
Not tight hydraulics Seal or tighten connectors
Improperly adjusted or damaged oil
distributor Adjust or replace
Cutting disk rotating in opposite
direction Swap connections
Not tight hydraulic assembly, broken
or torn hydraulic hoses Remove any non-tightness, replace hoses
2. Tree stump not
evenly ground Damaged or blunt cutting knives Turn knives by 1/3 turn, handle for recovery or replace
Jerky, non-accurate motions of
extension arm Improperly adjusted choke valves on extension arm's cylinders
3. Low rpm of
cutting disk Improper tractor's PTO rpm engaged Switch tractor's PTO shaft rate to 1000 rpm
Low rpm
at tractor's PTO Increase tractor's engine rotary speed
Worn hydraulic engine Replace
Not tight hydraulics Seal
4. Loud operation
Loose mounting bolts of hydraulic
engine or tree stump grinder ’ s
mounting plate
Tighten bolts
5. Significant
vibrations of the
grinder and the
extension arm
Loose cutting knives or knife holders Tighten bolts
Loosened bolt connections Tighten bolts
Cutting knife or knife holder missing Mount cutting knife or knife holder
6. Oil leak Improperly bolted connecting
nozzles Bolt connecting nozzles
Worn, damaged sealants, fittings Replace sealants, fittings
Not tight hydraulic cylinder Recover
Replace
Any works related to replacement of worn or damaged parts should be done only after the
machine has been switched off, and having previously learned the contents herein. After the engine
has been turned off and the ignition key removed, the vehicle should be secured against any
accidental movement.
Set the machine in a standstill position according to the instructions herein. When conducting
repair works or replacing worn or damaged parts wear protective gloves, protective footwear as
well as protective clothing without any loose elements. When operating with the machine lifted up,
protect it properly with supports and when replacing parts with sharp edges, use personal protective
equipment and corresponding tools. Once works related to replacement of defective parts are
completed, mount back all elements of guards and safety devices.

Operator's manual
TREE STUMP GRINDER
FP 20
- 15 -
4. EQUIPMENT AND FITTINGS
Tree stump grinder comprises the following basic equipment:
• tree trump grinder with any parts required for its connection,
• warranty card,
• operator's manual,
• catalogue of parts.
Equipment and spare parts:
• cutting disk,
• hydraulic engine,
• knife holders,
• cutting knives,
• hydraulic hoses,
• rubber guard
• any other parts included in catalogue of parts.
Additional equipment:
• warning plates with combined lights and reflectors,
• triangle warning plate.
NOTE!
Use only original SaMASZ fittings and spare parts. Spare parts of unknown
origin or new made are of less strength and have unfavourable influence the
on machine’s overall performance and safety.
NOTE!
The SaMASZ co. shall not bear any responsibility for damages and defects
caused as a result of applying non-original parts and fittings.
5. OPERATION
5.1 Maintenance and service
Each time before operating the tree stump grinder do the following:
• make sure that both the tractor and the extension arm, which the tree trump grinder is mounted
on, work properly,
• examine bolt connections of cutting disk, knife holders, knives and tighten if necessary,
• examine torque of all bolts and nuts according to Table 5,

Operator's manual
TREE STUMP GRINDER
FP 20
- 16 -
Table 5. Torque values for bolts
• examine condition of hoses and hydraulic connections,
• examine condition of cutting knives, and if need be, turn by 1/3 turn, recover or replace,
• replace damaged parts.
After 4-5 hours of operation:
• examine bolt connections, and connections on cutting disk, knife holders and knives, and if
need be tighten according to Table 5 ,
• examine condition of rubber guard,
• examine condition of hoses and hydraulic connections,
• examine cutting knives for operating condition.
Once operation with tree stump grinder is completed, do the following:
• clean and wash thoroughly.
In order to ensure a long-lasting high-quality cutting, the knives are mounted in knife holders
so that if knife-fixing nut is loosened and the knife is removed from the holder, it can be turned by
1/3 turn. This is to achieve 3 sharp cutting edges and
3 times longer knife's service life ( Fig. 6 ).
As an additional equipment or a spare part, knives can be ordered in two options:
• Red – knives with large hollow on blades for applications in non-sandy areas, where tree
grinding is problem-free,
• Green – knives with smaller hollow on blades for applications in sandy areas.
Fig. 6. Knife rotation to achieve sharp cutting edge
Elements the damage of which may pose risk to health and safety of the operator are as
follows: rotor with knives, safety guards and hydraulic hoses.
Resistance class 6.8 8.8 10.9 12.9
A MA [Nm]
M4 2.2 3.0 4.4 5.1
M5 4.5 5.9 8.7 10
M6 7.6 10 15 18
M8 18 25 36 43
M10 37 49 72 84
M12 64 85 125 145
M14 100 135 200 235
M16 160 210 310 365
M18 220 300 430 500
M20 310 425 610 710
M22 425 580 820 960
M24 535 730 1050 1220

Operator's manual
TREE STUMP GRINDER
FP 20
- 17 -
5.2 After-season maintenance
Follow instruction given in section 7: “ Maintenance and storage ” .
6. MAINTENANCE AND STORAGE
After the tree stump grinder has been dismounted from the extension arm, for idle period
longer than one month, perform the following maintenance works:
• clean the tree stump grinder thoroughly from any soiling and then wash and dry,
• if need be, perform any repairs, adjustments, replacement of sealing or hoses,
• remove any sources of corrosion and complement any paintwork defects,
• protect non-painted metal surfaces with a thin film of a solid grease, e.g. ŁT – 43, or gearbox,
mineral or motor oil, e.g. 15W40,
• complement or replace illegible warning and information labels,
• close connection nozzles of hydraulic hoses.
Tree stump grinder should be stored in a standstill position in a dry and clean place,
inaccessible to unauthorised personnel and animals, on an even and paved ground under a roof or
any other cover protecting it from the weather.
When approaching operation after the machine's storage period, examine technical condition
of hydraulics and drive train as on daily basis, complement the paintwork, re-grease and examine
condition of hydraulic hoses.
7. TRANSPORT
For transport set the grinder in a transport position on its support leg, with the mounting plate
up. Cover the tree stump grinder with bubble foil and fix it on a pallet with duct tape. Any further
moving of the machine should be done with the fixed pallet, considered as its integral part.
To place the tree stump grinder on a pallet use a webbing sling and a lifting device with
capacity of no less than the grinder ’ s weight.

Operator's manual
TREE STUMP GRINDER
FP 20
- 18 -
8. SPECIFICATIONS
Table 6. Specifications of tree stump grinder
No. Characteristic parameters FP 20
1. Cutting disk working diameter [m] 0.4
2. Weight [kg] 90
3. Grinder
’ s dimensions (length/width/height) [mm] 580/380/530
4. Drive type hydraulic
5. Recommended hydraulic oil demand for tree stump grinder
[l/min] 90-100
6. Max. permissible pressure [MPa] 40
7. Nominal WOM rpm (for SaMASZ extension arm) [rpm]
700-1000
8. Mounting on extension arm 6 bolts M14x50
9. Nozzles of hydraulic hoses EURO G 1
”
10. Rotational speed of cutting disk [rpm] Max 3,500
11. Cutting knife count [pcs.] 16
12. Transport speed [km/h] Max. 25
13. Number of operators One person
14. Level of noise emitted by
the machine L
pA
95 ± 1 dB
L
Amax
106 ± dB
L
Cpeak
109 ± dB
L
pA
– level of noise exposure related to an 8-hour work shift. Time-averaged acoustic pressure
level for emission corrected by frequency characteristic A.
L
Amax
– maximum value of measurement for acoustic pressure level for emission corrected by
frequency characteristic A.
L
Cpeak
– peak acoustic pressure level for emission corrected by frequency characteristic C.