DUUN VM420 User manual

Fire wood processor VM420
Instruction manual
Duun Industrier as
7630 Åsen, Norway
www.duun.no

2
Congratulations with your Duun VM420 firewood processor.
All Duun tractor operated machines has been engineered and tested in close cooperation with end
users of our products. This in order to develop reliable and user friendly machines
Please red instructions manual before you start using the machines..
BA
Machine identification
Serial number and manufacturer should be indicated at badge (A)
Register serial No and time of delivery as indicated.
Do always specify serial number every time requesting service for the machine.
The machine has a CE-badge (B) this confirms that the machine has been manufactured in
conformity with: Directive 98/37/EC Mechanical equipment Article 8 Annex 4 and 5
Serial number
Time of delivery (month-year)

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List of content
MACHINE IDENTIFICATION 2
WARRANTY TERMS 9
DELIVERY FORM FOR DUUN CM430 FIREWOOD PROCESSOR 10
SPECIFICATIONS 11
PREPARATIONS BEFORE USE 13
TRANSPORT AND HANDLING BEFORE USE 13
PREPARATION FOR MOVING WITH TRACTOR.13
SECURING BEFORE MOVING 13
HYDRAULIC OIL -QUALITY.14
OIL LEVEL CHECK.14
OIL TEMPERATURE CHECK 14
CONDENSE CHECK 15
DRIVE SHAFT 15
PREPARATION OF THE TRANSPORTER.16
PREPARATION OF THE FEEDING CONVEYOR 16
SETTING OF CUTTING LENGTH 16
SETTING OF SPLITTING LENGTH FROM 60 TO 40CM 17
SETTING OF SPLITTING LENGTH FROM 40 TO 60CM 17
HEIGHT ADJUSTMENT OF THE MACHINE 18
PRACTICAL USE 18
CONDITION 18
START-UP AND SUITABLE ROTATING SPEED –500 –540 RPM 18
MAIN FUNCTIONS –FEEDING –SPEED ADJUSTMENT OF THE FEEDING CONVEYOR 19
ADJUSTMENT OF CUTTING 19
SPEED OUTPUT CONVEYOR 19
HYDRAULIC KNIFE LIFT 20
CUTTING 20
SAFETY HAND OPERATED LOG HOLDER 20
SIDEWAYS ADJUSTMENT OF THE TRANSPORTER 21
JAMMED WOOD MATERIALS 21
CHAIN SHARPENING 22
CHAIN TENSIONING AND ADJUSTMENT OF THE CHAIN LUBRICATION 24
SERVICE AND MAINTENANCE 25
EVERYDAY MAINTENANCE INSPECTION 25
WEEKLY MAINTENANCE 27
LUBRICATION POINTS 28
MONTHLY MAINTENANCE 29
YEARLY MAINTENANCE 29
DECLARATION OF CONFORMITY 30
SAFETY

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All operators, mechanics and the owner must be well acquainted with the instruction in this instruction
manual before the machine is taken into use.
You should always work with care when you employ agricultural machinery. Read and observe the
safety instructions in this binder. Your safety is your responsibility!
Be particularly aware of warning signs with this symbol it marks measures
that must be carried out in order to avoid accidents. The symbol appears in
the instruction manual and on warning signs on the machine.
Instruction manual
All operators, mechanics and the owner must be well
acquainted with the instruction in this instruction manual
before the machine is taken into use.
The safety of the surroundings
Make sure that no-one not concerned are present in the
area of work. We emphasize as strongly as possible that
only one person is to handle the machine, i.e. operate the
saw chain sword and the splitter. Nobody is to assist the
main operator in the work area - risk of injury!
Never start the machine when there are people or animals
close to the machine or the tractor. Never stand between the
tractor wheels and the machine!
If other persons than the operator of the machine are
present in the risk zone, the operator is to explain the
danger the machine involves!
Personal protection equipment
You should always wear hearing protection and protective
goggles when using the wood machine. Further, you should
use protective footwear and sturdy work gloves during
handling of the machine and the materials.

5
Clothing and the drive shaft
Do not work in clothing that may be caught in the moving
parts of the machine (for example scarf, wide coats).
The tractor must be disconnected and the hand brake
activated before the shaft is connected to the tractor’s
power take-off. The drive shafts are always to be equipped
with original protection covers.
Damaged and worn covers are to be replaced
immediately!
Make sure that all covers for the shaft are in good
condition and correctly fitted. Never start the machine
when this is not in order. The locking chains for the plastic
covers are always to be fixed to the appropriate brackets
in order to prevent the covers to rotate.
Safe connection and use.
Allow nobody to stay between the machine and tractor
when the machine is connected to the tractor. The same
applies during use of the machine. Make sure that the
connection is carried out in a safe manner.
6. Safety in case of interruptions and maintenance.
Remember always to stop the tractor’s engine and remove
the ignition key before you lubricate, adjust, clean or carry
out repairs. This is to secure that the tractor does not start
before you have completed the operation.
.
Hydraulic high fluid pressure.
Be careful when you work with hydraulics. Wear eye
protection and gloves. Hydraulic oil under great pressure
may penetrate the skin and cause serious infections. See a
doctor is you have had had an injury. Ensure that no-one is
standing close by when hydraulic functions are performed.

6
Rotating parts –risk of crushing
The machine’s rotating parts may cause severe
injuries. The same applies to risk of crushing
during operation.
All covers and protective equipment is to be fitted
on the machine during use. The user is responsible
if an accident occurs as a consequence of
defective protection.
Avoid all unnecessary stay in the working area
when the machine is in operation.
Never put your hand in behind the protective
screen even if the saw chain is in back
position.
.
Zero alcohol tolerance
Persons who are under the influence of drink or
drugs must not operate the machine. The same
applies to tired people who do not have full control
over their movements.
Contact with electric wires and similar during
transport.
Be aware that the wood machine may be taller
than the tractor during transport and there is a risk
of contact with electric wires, railroad underpasses
etc!
If the machine has been set up for splitting of 60cm
wood lengths, it should be set back to 40cm before
moving. This is because the machine will protrude
on the right side if it transported in "60cm set-up". If
you choose to move the machine in “60cm set-up”,
you should be very attentive of the fact that there is
a protrusion beyond the width of the tractor on the
right hand side.
Conveyor –conveyor belt
Avoid staying under the transporter when this is
under tension in order to avoid injuries in case of
any uncontrolled downfall during use. Also avoid
contact with the transporter’s moving parts during
use.
.

7
Horizontal positioning and tidiness on the
workplace
Always place the machine as horizontally and
steady as possible to secure stable working
conditions.
Keep the workplace as tidy as possible. This
contributes to generally better safety against
unwanted events.
Area of application
The machines are only intended for production of
fire wood from “pure” wood material without any
contaminants. It is not allowed to employ the
machine for other material such as construction
waste and similar with metal parts such as nails,
screws and similar. The same applies for materials
that are polluted with plaster and similar coatings.
The saw chain is only designed for wood materials
without contaminants.
Good lighting –a necessity.
The machine must only be used in daylight that
secures a good overview of the operations –or
with artificial lighting which provides good overview
of the work area.
Good lighting is very important with reference to
safety.
Safe transport
Before the machine is moved, the feeder conveyor
and transporter (both in an up-right position as
outlined in the illustration) are to be strapped to
secure that they do not fall down. The loading strap
has a fixing point at the lower part of the feeding
conveyor and secures the conveyor belt from
falling off during transport.

8
17. Safe cutting
Avoid placing your hands close to the saw chain.
This is obtained by consequently using the log
holder A and the handle B to operate it.
For cutting the last log of wood, it is important to
retain a “suitable” length and cut a shorter piece as
the next to last..
You are advised to use the “count-down ruler” for
the last three lengths so that these may be cut to a
somewhat shorter even length than the desired
length.
When you want to cut twiggy or crooked logs, it is
important to make sure that these are securely
placed.
.
Before start-up after maintenance you should check that all tools have been removed and brought
back into place.
Before the machine is elevated or lowered, you should check that no-one is close to or touch the
machine.
If any warning signs are removed during repair or service, new signs must be fitted
immediately!

9
Warranty terms
Fire wood processor VM420 has a 12 month guarantee against defects in materials and
workmanship.
Parts that are not originally manufactured by Duun Industrier AS, for example shafts, bearings etc.
are subject to these suppliers’ guarantees and terms.
Parts that are considered to be wear parts are not part of the basis of the guarantee - these have
been specified in a separate survey on the bottom part of this page.
In cases where a repair is considered to be covered by the guarantee, the representative must inform
the supplier’s representatives that the repair is intended executed on the basis of the guarantee.
In this context, the following information must be recorded:
Product name
The product’s serial no. (see the machine identification pp. 6 and 7]
Date of sale
The product owner’s telephone no.
Dealer with address, telephone no.
In case of such a repair, the supplier is presented with a claim within 3 weeks after the repair date.
Replaced parts are to be kept until a decision has been made with reference to the claim and the
replaced parts are to be forwarded to Duun Industrier for assessment if so required.
As the employment of the product is beyond our control, we may only guarantee the quality and do
not accept liability for the product's general performance.
The guarantee liability assumes that the prescribed maintenance has been carried out.
Duun Industrier reserves the right to modify the design and specifications and/or make alterations
and improvements without notification.
What is not included by the guarantee
The guarantee does not cover economic loss as a consequence of interruptions.
The guarantee does not cover consequential loss due to defects.
The guarantee does not cover defects or damage caused by misuse and use that is not in
accordance with the instruction manual’s specifications and guidelines.
The following parts and material are considered as wearing parts and are not covered by the
guarantee:
.
The chain saw bar
The saw chain
The wood splitter knives
The feeding belt
Oil filter
Hydraulic oil
Filter cartridge for hydraulic oil
Wear parts in splitting mechanism

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Delivery form for Duun VM420 firewood processor
Machine specifications
Model _ _ _ _ _ _ _ _ _ _ _
Serial No.. _ _ _ _ _ _ _ _ _ _ _
Customer details
Machine owner _ _ _ _ _ _ _ _ _ _
Address _ _ _ _ _ _ _ _ _
Aip code. _ _ _ _
Town _ _ _ _ _ _ _ _ _
Hand over of machine
Sales representative and customer have controlled that the machine do not have any transportation damages and that
specified equipment is delivered..
The customer has been instructed how to use the machine:
-How to prepare machine for use from transport position.
-Height adjustment of machine and correct length of pto to reduce strain
-from too steep angle between tractor and processor (page 14 and 18)
-How to control temperature and oil level. (page 13)
-How to control eventual condensation level in oil tank (page 14)
-What is correct pto speed . (page 17)
-The machine functions.
Feed belt: Speed adjustment . (page 18)
Use of ”remote” control
Cutting : Adjustment of saw movement speed and power (page 18)
Sharpening and tightening of chain. (page 21-23)
Adjustment of chain greasing (page 23)
How to use log clamp. (page 19)
Splitting: How to use handle for forced return . (page 20)
Elevation of splitting knives and change og splitting knives (page 19)
How to switch from 40 to 60cm splitting length and vice versa. (page 16)
Conveyor: Speed adjustment . (page 18)
Sideward movement of conveyor. (page 20)
Sales representative and customer have read about service and maintenance (page 24-28).
The customer has been introduced to warranty terms (page 8)
The customer has been introduced to conditions for practical use (page 17)
Part list is available at sale representative.
Place _ _ _ _ _ _ _
Date _ _ _ _ _ _ _
Customers signature Sales representatives signature
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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Specifications
Feature
VM420
Net weight
875 kg
Length feeding belt A
2200 mm
Length output conveyor-transporter B
4000 mm
Sideways transporter + total
25 degrees to each side
Number of positions for transporter D
5 pcs
Total width during transport
2.550 mm
Height to work table max min F
880-960 mm
Total width assembled 30 degrees trans
6.850 mm
Depth seen from the side
1.280 mm
Velocity drive shaft
540 rpm
Connection with bolt fittings are standard
Yes
Total height ready for transport E
2,550 mm
Diameter ventilation fan
254 mm
Required power PTO 540 rpm max
31 kW
Number of oil pumps
3
Length of stroke wood splitting function
40 or 60 cm
Max cutting diameter logs
42 cm
Speed splitting cycle 40 cm wood
About 2 seconds at 8.5 tons
Splitting force max speed
5.5 tons
Splitting force at power drive (max power)
8.5 (11.0 tons)
Connection and de-connection of power
drive
Automatic
Drive of saw chain
Hydraulic
Drive of input and output conveyor
Hydraulic
Saw chain lubrication capacity container
5 litres
Saw chain lubrication
Separate pump adjustable
Oil tank volume
78 litres
Splitting knife
6-splitter is standard
Hydraulic pressure
220 bar max
splitting force
180 bar cutting circuit
Accessories
Art. No.
4-splitter knife
14120004
8-splitter knife
14120003
Power shaft Weasler L=860 4 piece
2962156
Remote control of input conveyor
141209020
All specifications are approximate values.

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F
C
E
D
D
A
B

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Preparations before use
A
Transport and handling before use
The VM420 body is equipped with a fork pocket
(A) for handling with fork truck or pallet forks. Be
aware that one individual wood machine weighs
about 875 kg. Use lifting equipment designed for
such total weight!
G
B
E
Preparation for moving with tractor.
The transporter is folded together in the joint E.
Afterwards, the transporter is moved to an up-
right position by means of the winch wire. During
this process, the protection cover is shifted in
point B Feeding table and the conveyor belt is
adjusted to a vertical and horizontal position by
releasing the locking pin in point G
Securing before moving
Finally, the connection between the feeding table
and the transporter should be secured by means
of a strap for this purpose with fixing points as
shown in the illustration. This is important to
ensure that the feeding conveyor is kept in place
during transport and the connection between the
feeing table and the transporter is safely secured.

14
Hydraulic oil - quality.
The machine’s performance will, to a high
degree, depend on keeping the hydraulic oil
intact. The greatest elements of risk for the
quality of the oil are
Excessively high temperature which
entails poor lubrication performance and
risk of faults and break-down of expensive
components such as valves, pumps and
motors.
Condensation which is formed during
conditions including humid air combined
with temperature fluctuations. (the oil tank
breathes through the filter and sucks in
humid air)
Condensation water in the oil has the
same effect as excessively high oil
temperature. Condensation appears
mainly during use in conditions involving
humid air and temperature around 0°C.
The oil tank is equipped with a draining
plug for changing oil and checks for
condensation
Oil level check.
The machines are filled with 78 litres hydraulic oil
from the factory. Recommended oil quality is ISO
VG46 (viscosity group 46). Examples of such oils
are Ambra Hydrosystem 46 HV, Mobil DTE15m,
Statoil Hydraway HVXA46.
The oil level must be checked by observing the
sight glass A which is fitted in the suction grille
for the hydraulic oil tank.
Oil temperature check
It is very important to keep track of the oil
temperature B and avoid situations where it
exceeds 70 degrees. This situation may occur
during unfavourable operating conditions for
example in case of too high rotational speed
during use. If the temperature exceeds 70
degrees C, the machine must be stopped until a
lower temperature has been “established”.
If the machine has had excessively high
hydraulic oil temperature, the oil must be
changed.
This is an unconditional requirement in the
guarantee provisions.

15
Condense check
The oil tank is equipped with a drainage plug C in
the bottom. Grey oil is an indication of water in
the oil. In case the oil is polluted with water, all
the hydraulic oil must be changed.
Beyond such conditions, the hydraulic oil must be
changed every year or after 500 operating hours
(whatever occurs first).
Drive shaft
The requirement for the length of the drive shaft will vary in pace with the size of the tractor and the
length of the steady-braces.
If there are operating angles from 25 degrees and upwards, you should employ a category 6 shaft to
ensure long service life.
If there are great angles, it might be advantageous either to lower the tractor or elevating the machine.
It may be elevated by means of the supporting legs which is standard equipment fitted in the corners
and elevate the machine up to 80mm.
Ensure that the pto shaft had sufficient length. The profile tubes in the shaft are to, after any cutting,
overlap by half the tube length. Any cutting of the shaft must be executed in accordance with the
instructions for such operations –the cut must be trimmed for burrs both on the inside as well on the
outside and the profile tubes should be well greased. Too short telescope length of the shaft entails a
risk of overload of the tractor’s power take-off and the gearbox of the VM420.
Please lubricate the PTO drive shaft before use.
The locking chains for the plastic covers are always to be fixed to the appropriate brackets in order to
prevent the covers to rotate.
The drive shaft must be maintained and used in accordance with its instruction manual.
In order to obtain better operating angle, you may let the machine stand by itself and place the tractor
at a distance and employ a longer drive shaft during operation.

16
Preparation of the transporter.
The transporter is prepared for operation by
1. Releasing the strap fixing point and
loosening the strap at the points outlined
in the illustration.
2. The transporter is put in place by releasing
the winch and the wire which holds it in
place –the transporter will fold out until it
is level with the ground.
3. Afterwards, the transporter is folded out in
its full length in the joint E.
4. The transporter is elevated to the required
height by means of the winch.
Preparation of the feeding conveyor
The feeding conveyor is folded in place by releasing the locking pin at letter G which locks it.
The belt is tensioned by adjusting the screws at letter H. The belt is sufficiently tensioned if it feeds in
the wood without friction. Too hard tensioning increases the wear of the belt and reduces the service
life considerably.
An indication of what is suitable tensioning is when the belt in the middle of the feeding table, allows
for 30-40mm –Re. Illustration 4, letter I.
Setting of cutting length
The cutting length is set by releasing the screws
at letter Aand adjusting the rest Bat desired
cutting length.

17
D
H
Setting of splitting length from 60 to 40cm
The adjustment of the splitting length from 60 to
40cm consists of three elements:
1. Make sure that the splitting piston is left in
the outer extreme position; i.e. is not
retracted. The first step in this operation is to
start a splitting movement with the cutting
handle C. Afterwards, the handle is moved
for forced return by the splitter D quickly
forward E and afterwards backwards F). After
this procedure, the piston is left in the outer
extreme position –i.e. the “protruding length”
of the piston must be minimum 200mm.
2. Physical moving of the splitting cradle to the
desired splitting length (stroke length splitting
cylinder). In order to do this, the locking bolt
F is released by a grip. The square hole on
the handle for the locking bolt F is employed
to rotate the shaft G which, by means of a
cogwheel, moved the splitting cradle in or out
until it stops in the limit points. After this
operation, the locking bolt F is put in place
again.
3. Adjustment of the stroke length of the
splitting cylinder. This is executed by putting
the impulse bar in the correct position in
letter H. It is important that the operation in
section 3 is carried out for all adjustments in
order that the machine is to function as
prescribed.
Be particularly aware of the fact that the same
procedure must be carried out in its entirety for
all such adjustments.
Setting of splitting length from 40 to 60cm
The adjustment of the splitting length from 40 to
60 cm consists of two elements:
1. Physical moving of the splitting cradle to the
desired splitting length (stroke length splitting
cylinder). In order to do this, the locking
bolt F is released by a grip. The square hole
on the handle for the locking bolt F is
employed to rotate the shaft G which, by
means of a cogwheel, moved the splitting
cradle in or out until it stops in the limit
points. After this operation, the locking bolt F
is put in place again.
2. Adjustment of the stroke length of the
splitting cylinder.
This is executed by putting the impulse bar in
the correct position in letter H. It is important
that the operation in section 2 is carried out
for all adjustments in order that the machine
is to function as prescribed.

18
Height adjustment of the machine
In order to be able to elevate the machine in
intervals of 40mm up to 80mm, the supporting
legs that are fitted in the corners may be set in
the required height.
Practical use
Condition
The machine may not be used before the
operator has done the following:
Has read the instruction manual and
knows how the machine works and how to
operate it.
Has made himself acquainted with and
observed the information regarding safety
described on pages 8 to 12 in the
instruction manual.
Employs suitable clothing; i.e. hearing
protection –protective goggles –
protective footwear –work gloves.
Does not use clothing that may be caught
in the moving parts of the machine (for
example scarf, wide coats).
If any faults occur in the functions of the
machine during employment, the machines is
to not to be used before the defects have
been repaired.
Start-up and suitable rotating speed –500
–540 rpm
The power take-off of the tractor is connected at
low rotating speed and increased slowly to 540
rpm which is the max rotating speed of the pto.
In order that the machine is to work at its
optimum, the rotating speed must be between
500 and 540 rpm.
At lower speed, some functions will receive too
low oil pressure.
Let the machine run for some minutes before you
start the hydraulic functions.

19
Main functions –feeding –speed
adjustment of the feeding conveyor
The wood material that is to be cut is fed by
means of the feeding conveyor.
The main functions are
A. To move the feeding conveyor
forwards/backwards.
B. Operate the cutting sword up and down.
C. Releasing the splitting blow.
It is important that the feeding until the stop is
carried out in a moderate speed so that the logs
do not bounce back.
In order to adjust the feeding speed, the impact
may be adjusted by releasing the screw at letter
D and move the impact stopper on the underside
to the left.
Adjustment of cutting
In order to adjust the cutting function optimally to
the wood material, the speed and the pressure of
the sword may be adjusted.
The speed of the movement of the sword
downwards is adjusted by means of the wheel to
left at letter E.
The pressure on the sword is adjusted by means
of the wheel at letter F.
As a starting point, the pressure is set at the
lowest possible level.
The main rule is that the thicker the wood
material, the slower the movement of the sword
and the lighter the pressure. Too strong feeding
will entail that the engine will not pull the chain
and is disconnected by the safety valve.
Too little pressure may cause the chain to jump.
The cutting movement may thus be adjusted to
the thickness of the material.
G
Speed output conveyor
The speed is adjusted with an adjustment wheel
fitted on the adjustment block for this at letter G
as illustrated.
Select a speed that suits the purpose –depends
on the desired throwing length and container to
receive the wood.

20
Hydraulic knife lift
The splitting knife H is adjusted up H and down I
with the lever equipped for this purpose
In order to change knife J, the lever is moved to
the top position (H). In this position, the knife may
be lifted out by pressing it forward and lifting it
up.
Cutting
The lever for operating cutting and operation of
the feeding conveyor forwards and backwards
(E) has several functions:
The saw chain is hydraulically operated and
starts when the lever is moved towards (D).
The lever also releases the splitting function
when it is moved towards (B) as illustrated.
Thin wood material that is not to be split
When cutting thin wood materials, you may cut
several continuous lengths and let them fall into
the splitting cradle without activating the splitting
piston. This makes for a far faster cycle.
The splitting function is always released by
moving the cutting lever to position B.
Safety hand operated log holder
Avoid placing your hands close to the saw chain.
This is obtained by using the log holder B and the
handle A to operate it.
For cutting the last log of wood, it is important to
retain a “suitable” length and cut a shorter piece
as the next to last. During this operation, it is
especially important to use the hand operated log
holder B by means of the handle A so that the
user does not receive an unexpected backlash
from the final piece.
When you want to cut twiggy or crooked logs, it is
important to make sure that these are securely
placed. Use the hand operated log holder as
much as possible during cutting of such wood
materials to prevent that fingers/hands are
squeezed.