Redwood Forst ST6p User Manual

Redwood Global Ltd,

Unit 86, Livingstone Road, Walworth Business Park, Andover,

Hampshire. SP10 5NS. United Kingdom

p Woodchipper

USER MANUAL

ENGLISH

21/11/2018 Revision 3

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Table of Contents

Introduction ............................................................................................................................................ 3

Purpose of machine ............................................................................................................................. 4

Safety ..................................................................................................................................................... 7

Safe working ..................................................................................................................................... 7

Machine lifting ................................................................................................................................... 8

DOs and DON’Ts ............................................................................................................................. 9

Noise test information ........................................................................................................................ 10

Machine operation .............................................................................................................................. 11

Machine control panel, start/stop & operating settings ............................................................ 12

Ignition switch ................................................................................................................................. 12

Emergency Stopping – Standard Program .................................................................................... 15

Emergency Stopping – Orange Button Program ........................................................................... 16

Feed jam & blockages ....................................................................................................................... 17

Transportation ..................................................................................................................................... 18

Attaching to the vehicle tow hitch ................................................................................................ 19

Unhitching the machine ................................................................................................................. 19

Routine maintenance ......................................................................................................................... 20

Engine maintenance ...................................................................................................................... 21

Fastener tightening torques .......................................................................................................... 21

Service schedule ............................................................................................................................ 22

Covers: engine, chipping chamber, side panels ................................................................. 24

Engine bay ...................................................................................................................................... 25

Blade changing……………………………………………………………….…………………...27

Blade sharpening ........................................................................................................................... 28

Hydraulic oil filter ............................................................................................................................ 29

Battery .................................................................................................................................................. 32

Battery safety information ............................................................................................................. 32

Storage and transport .................................................................................................................... 32

Initial operation ............................................................................................................................... 32

Battery removal & maintenance ................................................................................................... 32

Charging .......................................................................................................................................... 33

Jump starting................................................................................................................................... 33

Taking battery out of service ........................................................................................................ 34

Parts lists ............................................................................................................................................. 35

Hopper tray touch sensor .......................................................................................................... 35

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Chipping chamber assembly ........................................................................................................ 36

Chipping chamber assembly - Bottom feed. .............................................................................. 36

Chipping chamber assembly – Bottom feed & Anvil. ................................................................ 38

Chipping chamber assembly - Drive .......................................................................................... 39

Chipping chamber assembly - Flywheel drive. ......................................................................... 40

Chipping chamber assembly - Bottom feed roller cover. ......................................................... 41

Chute assembly ............................................................................................................................ 42

Top feed roller assembly ............................................................................................................... 43

Flywheel assembly ......................................................................................................................... 44

Fuel Tank Assembly ...................................................................................................................... 45

Hydraulic Pump Assembly ............................................................................................................ 46

Light board assembly ..................................................................................................................... 47

Belt Tensioner assembly ................................................................................................................... 48

Running gear – hitch & axle .......................................................................................................... 49

Hydraulics circuit diagram ................................................................................................................. 49

Electrical circuit diagram – Mechanical & touch sensor hopper ................................................. 50

Decals .................................................................................................................................................... 50

Manufacturer’s Statutory Plate ......................................................................................................... 52

Warranty .............................................................................................................................................. 53

CE Certificate ...................................................................................................................................... 54

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Introduction

Thank you for becoming the owner of this Redwood Global Ltd, Forst ST6p
woodchipping machine. By observing the contents of this manual, we hope the
machine gives safe and productive service. This user manual is intended for the
owner/operator to safely and effectively operate this machine and carry out routine
maintenance between services. This is not a comprehensive service manual. See
Service Schedule for routine maintenance and when to take the machine to a service
specialist. For engine maintenance, please refer to the engine manual supplied with
this machine.

This machine has been through a pre-delivery inspection before leaving the factory
and is ready to use.

Before use and as a minimum, the safety and machine operation
sections covered on pages 4 to 19 must be read and understood.
Failure to do so could result in serious injury or loss of life to the
operator and others nearby. Also, damage to property and this machine may

occur. Please observe and obey all warning signs (decals) located on the machine.
Their meaning is covered in this manual under decals.

All personnel working with this machine must be adequately trained in its use and
most importantly, follow the advice on safe working practices.

Redwood Global Ltd endeavour to continuously develop and improve its products.
They reserve the right to make changes at any time, without notice or incurring any
obligation.

Continuous improvement will affect machine design and production so there may be
minor discrepancies between the actual product and this manual.

This manual must remain with the machine for reference by operators and includes
hiring or if the machine is resold.

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Purpose of machine

The Forst ST6p is designed to reduce wood material up to 150mm diameter to
woodchip. This machine is capable of processing up to 5 tonnes of wood per hour.

Engine

Briggs Vanguard V twin EFI
Roller feed

Twin series hydraulic motors

Maximum power

27.2 kW (37hp)

Maximum material diameter

150mm

Cooling method

Air cooled

Fuel capacity

30 litres

Overall weight

745kg

Hydraulic oil capacity

18 litres

Starting method

Electric

Material processing capacity

5 Tonnes/Hr

Fuel type

Petrol

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Exterior component identification

Figure 1

1

TRIP BAR

2

HOPPER TRAY LATCH

3

HOPPER

4

CHIPPING CHAMBER COVER

5

CHUTE HOOD

6

CHUTE

7

MACHINE LIFTING EYE

8

ENGINE COVER

9

MANUFACTURER'S STATUTORY PLATE

10

SERIAL NUMBER

11

JOCKEY WHEEL HANDLE

12

VEHICLE CONNECTION LEAD

13

TOW HEAD

14

MACHINE LIGHT BOARD SOCKET

15

ENGINE COVER LATCH

16

CHIPPING CHAMBER

17

THROTTLE

18

GREASE POINT

19

IGNITION SWITCH

20

CONTROL VALVE FEED SPEED ADJUSTMENT

21

CONTROL PANEL

22

FUEL TANK

23

LIGHT BOARD

24

FEED START/STOP TOUCH SENSORS

25

HOPPER TRAY

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Figure 2

1

CHUTE HOOD LOCK HANDLE

2

CHUTE HANDLE

3

CHUTE ROTATION LOCK HANDLE

4

BATTERY

5

REMOVEABLE NUMBER PLATE HOLDER

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Safety

Safe working

Before using this machine, make sure that you are trained and fluent in its operation.
Know the location of and how to use all the safety features. Know how to control the
feed and stop the machine in an emergency. Be familiar with the hazards and safe
working practices to prevent injury and damage to property and machine. Also be
aware of the legal restrictions for personnel and towing with vehicles.

1. The minimum age for service personnel is 18 years. Personnel aged 16 can
use the machine for training under supervision by a suitably trained person of
18 years or over.

2. Operators and personnel working with this machine must not be under the
influence of alcohol, drugs or medication that would impair judgement,
concentration or reaction times. Excessive tiredness is also a risk.

3. In use, woodchip and debris are ejected with considerable force from the
chute and can travel up to 10m. Make sure the chute directs woodchip to a
safe location so that no one can be harmed or property damaged. Do not
allow discharge to be directed onto roads or public rights of way.

4. Maintain a 10m exclusion zone around the machine and clearly mark if in a
public area. Keep this area free of material build up.

5. Make sure the machine is on even, level and stable ground and cannot move
or topple when in use. Use wheel chocks if necessary.

6. Keep children and animals well away from the working area.

7. The machine operator must wear protective equipment:

a. Chainsaw safety helmet (EN 397) with mesh visor (EN 1731)
b. Correctly rated ear defenders (EN 352)
c. Work gloves with elasticated wrist bands.
d. Steel toe cap boots (EN345-1)
e. Close fitting heavy duty non-snag clothing. Hi-viz clothing (EN 471) if

needed.

f. Protect breathing with a face mask if appropriate. Some plant material

can give off harmful dust and poisonous vapours. This may cause
respiratory problems or serious poisoning. Check the material to be
processed before starting.

g. DO NOT wear rings, bracelets, watches, jewellery or anything that

could be caught on the material being fed and draw you into the
machine.

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8. All personnel operating or feeding material into the machine must wear heavy
duty non-snag clothing to help prevent being caught on material and drawn
into the machine. The feed mechanism of this machine uses high powered
hydraulic motors to drive sharp toothed rollers that feed material into the
cutting blades. DO NOT take risks with it. NEVER ASSIST ANY MATERIAL
INTO THE FEED ROLLERS WITH HANDS OR FEET. Use the wooden
paddle or further long material if necessary.

9. Never climb onto the hopper area while the machine is in operation.

10. CAUTION! – Keep hands and feet outside the hopper. Do not attempt to force
material into the machine by hand – use a piece of wood if necessary.

11. Material can be forcibly ejected from the hopper towards the operator. Ensure
full head and face protection is worn.

12. Very twisted material should be trimmed into manageable pieces. Failure to
do this can result in material extending outside the hopper, moving
aggressively side-to-side creating a hazard to the operator.

13. Do not try to force material over 150mm in diameter into the machine.

14. Carefully site the machine so operators can work furthest from any local
danger. For example, on a road side, place machine so operators work on
the verge and not in the road exposed to traffic.

Machine lifting

The lifting eye is designed for securely holding the machine’s weight only. Do not
use hoist hook directly on the lifting eye. Use a correctly rated safety shackle.
Inspect lifting eye before each use and do not use if damaged.

Figure 3

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DOs and DON’Ts

DO stop the machine before making

any adjustments, refuelling or
cleaning.

DO make sure the machine has
stopped rotating and remove the
ignition key before any maintenance or
the machine is left unattended.

DO ensure that the machine is level,
well supported and cannot move
during use.

DO run the machine at full throttle.
DO conduct regular machine checks

for visual fluid leaks.
DO take regular breaks. Wearing

protective equipment can be hot and
tiring leading to a lack of
concentration, increasing the risk of
having an accident.

DO keep hands, feet and clothing out
of feed area, chute and moving parts.

DO NOT use machine in poor visibility
or insufficient light to see clearly.

DO NOT use or attempt to start the
machine without the discharge chute
or guards correctly and securely fitted.

DO NOT stand directly in front of the
in-feed hopper when using the chipper.
Stand to one side.

DO NOT allow the following to enter
the machine as damage is likely:

BRICKS

METAL

STRING

GLASS

CLOTH

RUBBER

PLASTIC

ROOTS

STONES

BEDDING
PLANTS

DO NOT stand in front of the chute.
DO NOT smoke when refuelling.

Petrol fuel is highly flammable and
explosive in certain conditions.

DO NOT let anyone who has not
received instruction, operate the
machine.

DO NOT climb on the machine at any
time except for a tracked machine
ride-on plate where fitted.

DO NOT handle material partially
engaged in the machine while in
operation.

DO NOT touch any exposed wiring
while the machine is running.

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Noise test information

Machine

Forst ST6p

Notes

Tested chipping 50 x 50mm sawn pine 4.2m in length.

Noise levels above 85dB (A) will be experienced at the working position and within a
4 metre radius. Operators and personnel within a 4 metre radius must wear
appropriate ear protection at all times while machine is in operation to prevent the
risk of hearing damage.

A-weighted emission sound pressure (beside operator’s ear) LpA = 106.3dB(A).
Peak C-weighted instantaneous sound pressure (beside operator’s ear) LCpeak =

128.4dB(C). Results at 10 metre radius are calculated.

Guaranteed sound power: 118dB(A)

As required by Machinery Directive 2006/42/EC “Noise Emission in the environment
by equipment for use outdoors.”

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Machine operation

STANDARD PROGRAMME

MACHINE USE

TOUCH SENSOR HOPPER

STAGE

1 Fold down hopper tray

Start engine.

2

Turn key to start engine and let go once

engine has fired

3

Allow engine to run for 30 seconds then

open throttle to full

4

For forward feed, touch green button

twice

5 Feed material

6

To stop, touch red button or push trip bar

7

To reverse feed, touch green button once

8 To stop machine

9 Touch red button or push trip bar

10 Close throttle to minimum

11 Switch off ignition and remove key

12 Before transporting machine

14 Sweep out debris from hopper

15

Close hopper tray by lifting fully up

against stops and engage latch

OrRANGE BUTTON PROGRAMME

MACHINE USE

TOUCH SENSOR HOPPER

STAGE

1 Fold down hopper tray

Start engine.

2

Turn key to start engine and let go once

engine has fired

3

Allow engine to run for 30 seconds then

open throttle to full

4

For forward feed, touch green button once

5 Feed material

6

To stop, touch e-stop button or push trip

bar

7

To reverse feed, touch orange button

once for short reverse or twice for

continual

8 To stop machine

9 Touch e-stop button or push trip bar

10 Close throttle to minimum

11 Switch off ignition and remove key

12 Before transporting machine

14 Sweep out debris from hopper

15

Close hopper tray by lifting fully up

against stops and engage latch

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Machine control panel, start/stop & operating settings

This machine is fitted with an engine PLC (Programmable Logic Controller) system
that manages the engine, feed and all safety features. The control panel is located
on the right side panel (see Figure 1). Feed and engine speed are controlled with a
“No Stress” function ensuring that cutting conditions are kept within optimum limits.
This maximises throughput while minimising jams and blockages. There will be
times when material is being cut and the feed will momentarily stop until engine
speed increases. At this point, the feed will start without warning. Service warnings
shown below will be displayed at certain intervals. The engine will not start until OK
is pressed.

First 20 Hour Warning: "Change Hydraulic Oil Filter"
Every 20 Hour Warning: "Blade and Machine check required see manual"
50 Hour Service Warning: "1st Full Service recommended"
Every 200 Hour Service Warning: "Full Service recommended"

Using the control panel:

Ignition switch

Figure 4
Turn ignition key clockwise to first position to turn the ignition on.

1

KEY ROTATION IN SWITCH TO START

2

IGNITION SWITCH POSITIONS & FUNCTION

3

OFF

4

IGNITION

5

START

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Turn ignition key fully clockwise to crank engine. Display will automatically go to P1

If engine fails to start, turn key to off position and start process again. P1 shows
Working Hours and charging indicator text at the screen bottom centre.

P2 shows I/O tests. Tests all functions and safety controls.

Pin screen
P3 shows No-Stress Settings
Actual RPM
Upper Band - 1450 RPM
Mid Band – 1250 RPM
Lower Band – 1050 RPM
Pin screen automatically displays if any setting changes are attempted.

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P4 Crank Time – 3

Feed speed adjustment

Figure 5

The feed speed can be adjusted to suit the material being chipped see Figure 5.
Turn dial to align number with pip. Set feed speed so that the No-Stress operates as
little as possible, this will give the highest throughput. When feeding Leylandii or
leafy material, set feed roller speed to 4.5.

To stop engine turn off with
ignition key by turning fully anti­clockwise.

1

CONTROL VALVE FEED SPEED
ADJUSTMENT.
POSITION INDICATED BY PIP.
0 = MINIMUM
10 = MAXIMUM

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Emergency Stopping – Standard Programme

Push the RED SAFETY BAR. This will stop the feed rollers instantly. The chipper
flywheel will still be turning. Turn the throttle lever to idle and switch off the engine
with the ignition key.

Before using the chipper every day

 Start the machine with the ignition key on the control panel.
 With the engine running at full speed tap the green button (3) once and the

rollers will go into reverse,

 Tap the green button again and rollers will go into forward (chipping mode).
 To stop the feed rollers either tap the red stop button (2) or push the red stop

bar (1) and the rollers will stop instantly.

 If any of these functions fail, turn off the machine and remove the key from the

ignition switch and contact Redwood Global and ask for service.

1

Red Stop Bar

2

Red Stop Button

3

Green Forward and Reverse Button

4

E-Stop (if fitted)

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Emergency Stopping – Orange Button Programme

Push the RED SAFETY BAR. This will stop the feed rollers instantly. The chipper
flywheel will still be turning. Turn the throttle lever to idle and switch off the engine
with the ignition key.

Before using the chipper every day

 Start the machine with the ignition key on the control panel.
 With the engine running at full speed tap the green button (3) and the rollers

will go into forward (chipping mode).

 Tap the orange button and the rollers will go into a short reverse, tap it again

and the rollers will continue in reverse.

 To stop the feed rollers push the red stop bar (1) and the rollers will stop

instantly and or push the e-stop button and whole machine will shut down.

 If any of these functions fail, turn off the machine and remove the key from the

ignition switch and contact Redwood Global and ask for service.

1

Red Stop Bar

2

Orange Reverse Button

3

Green Forward Button

4

E-Stop

P a g e | 17

Feed jam & blockages

Be aware that whatever is fed into the machine has to come out of the chute.
Always monitor the state of chip flow out of the chute. If this stops, STOP FEEDING
MATERIAL IMMEDIATELY. Continuing to feed material will further compact a
blockage and make it more difficult to clear.

If the chipping chamber or chute become blocked:

1. Stop the engine and remove ignition key.

2. Remove chute and check that it is clear.

3. If the chipping chamber is blocked, open the engine cover, then chipping
chamber cover. DO NOT REACH INTO THE CHIPPING CHAMBER WITH
HANDS. Beware that the flywheel within the chipping chamber has two sharp
blades mounted on it and can move causing a serious injury risk. Wearing
protective gloves and using a piece of wood, carefully clean out the chipping
chamber.

If feed becomes jammed (see Figure 6):

1. Stop the engine and remove ignition key.

2. Open engine and chipping chamber covers.

3. Release feed roller spring tension on both sides by slackening off the eye bolt
nuts and remove if necessary.

4. Insert feed lift tool and lift top feed roller to fully open.

5. Insert M12 screw into side of feed chamber and screw completely in. Lower
top feed roller onto the screw to secure in the open position.

6. There should now be access to the feed chamber. Beware that this is the
machines cutting zone. The top and bottom feed rollers have sharp teeth and
the flywheel cutting blades are not far from them. DO NOT PUT HANDS
INTO THIS AREA. Wearing protective gloves and using a piece of wood,
carefully clear jammed material inside feed chamber.

7. When clear, lift top feed roller via lifting tool, remove top feed M12 securing
screw, lower top feed roller and remove lifting tool.

8. Re-assemble feed tensioner springs and replace covers.

P a g e | 18

Figure 6

Transportation

 When towing the machine the maximum legal speed limit is 60mph.
 On very rough and uneven road surfaces, reduce speed to protect the

machine from undue vibration.

 When off road, avoid objects that may collide with the machine underside.
 Avoid steep gradients when off road.
 Avoid excessively pot holed ground.
 Exercise caution when reversing the machine as the short wheel base will

react quickly to steering.

 Keep tyre pressures inflated to 2.8 Bar or 41 psi.
 Check wheel nuts are tightened to between 90Nm and 100Nm.
 Clear machine of loose woodchip material before departing.
 Ensure the chute is securely fixed at the inboard position before departing.
 Ensure that the hopper tray is closed in the up position and the locking latch is

fully engaged before departing.

1

REMOVE EYE BOLT NUT BOTH SIDES
BEFORE LIFTING FEED ROLLER

2

INSERT TOP FEED ROLLER LIFTING TOOL
INTO SLOT AND LIFT

3

INSERT M12 SCREW TO HOLD FEED IN
OPEN POSITION

P a g e | 19

Attaching to the vehicle tow hitch

 Check that the vehicle ball hitch is well greased.
 Raise the machine hitch by turning the jockey wheel handle anticlockwise until

the hitch socket is above the vehicle hitch ball.

 Reverse the vehicle until the ball is directly below the machine hitch socket.
 Attach the breakaway cable/secondary coupling to a suitably strong point on

the vehicle, not the ball hitch.

 Ensure the barrel lock is retracted from the tow head.
 Grasp handle on tow head and push back catch with thumb.
 Wind the jockey wheel handle clockwise to lower the hitch socket onto the ball

hitch.

 Release tow head handle and continue to wind the jockey wheel handle

clockwise. The tow head should snap into place on the ball hitch. If it
doesn’t, repeat previous two steps.

 Wind jockey wheel up until fully retracted and the jockey wheel frame is

seated in its notch on the stem. The machine’s weight should be fully on the

vehicle.

 Release the jockey wheel clamp and slide the jockey wheel assembly fully up

then tighten clamp.

 Connect the vehicle trailer socket to the machine socket with the connection

lead. Check all machine lights and tow vehicle lights are working correctly.

 Insert the barrel lock for security.

 The machine is now properly attached to the tow vehicle.

Unhitching the machine

 Ensure the machine will not roll away after being disconnected from the tow

vehicle.

 Disconnect the trailer socket from the tow vehicle.
 Release the barrel lock.
 Release the breakaway cable/secondary coupling.
 Release the jockey wheel assembly clamp, fully lower the wheel and tighten

the clamp.

 Wind the jockey wheel handle anticlockwise until it starts to take the machine

weight.

 Grasp the tow head handle and release the catch with your thumb.
 Wind the jockey wheel handle anticlockwise until the tow head is clear of the

ball hitch.

 Drive the tow vehicle clear of the machine.
 Level the machine by winding the jockey wheel handle.
 The machine is now fully detached from the tow vehicle.

P a g e | 20

Routine maintenance

The following must be checked at least on a daily basis during use (also see Service
schedule):

Check engine oil. See Figure 9
Check hydraulic oil level. When the machine is new, the oil level may drop during

initial use. Regularly check and top-up until level settles. If a top up is required,
thoroughly clean around filler cap before removing to help prevent debris falling into
oil tank, top up as required and replace filler cap. See Figure 9

Grease machine. Every 8 hours, one pump of grease to each of the four nipples at
the central grease point manifold located near the control panel. See Figure 1.

 Check all fasteners are present and assembled to the correct torque.
 Check proximity sensors on engine cover, removable hopper and trip bar are

not damaged and working correctly. The trip bar sensor is the most
vulnerable and if severely damaged could result in the trip bar not working.

 Check drive belt tension and adjust as necessary. See Figure 10 & Figure 14
 Check pulleys and taper lock on flywheel shaft. See Figure 10.

 Check flywheel blades for damage and sharpness. Machine performance is

adversely affected if blades are blunt or damaged. Replace and sharpen
blades as required. Make sure that the blade seat is clean and free of
damage before reassembly. Shims are available to adjust for blade size
reduction after sharpening. Please refer to blade sharpening for size limits,
adjustment shims and setting. Ensure blade fasteners are correctly installed
and tightened to the appropriate torque. Check after 1 hours’ work then
weekly.

 Anvil and side anvil are replaceable and double sided. Make sure that the

anvil seat is clean and free of damage before reassembly.

 Exercise extreme care to avoid injury when removing and replacing blades

and anvils. The flywheel can turn creating crush and cutting points in and
around the chipping chamber.

 Check all hydraulic hoses and fittings after 5 hours’ work. Beware of hydraulic

oil leaks, they can cause serious injury while the engine is running and the
system is under pressure. A leak can easily inject high pressure oil deep into
flesh and blood stream requiring immediate medical attention. DO NOT
CHECK FOR LEAKS WHILE THE ENGINE IS RUNNING. Hoses to the feed
roller hydraulic motors are the most likely to become damaged as they are
constantly moving during use. If hoses are replaced, all seals must be
replaced at the same time.

 Check top and bottom feed motor mount bracket bolts weekly.

P a g e | 21

Engine maintenance

Please refer to the engine manual supplied with this machine for the following:

 Checking the engine oil.
 Changing the engine oil, oil filter and fuel filter.

Fastener tightening torques

Nominal
torque
Nm

Max/Min
torque

Nominal
torque
Nm

Max/Min
torque

Size
M6 10 9.5/10.4 14.5 14/15.3
M8 25 23.1/25.3 35 34/37.2
M10 49 46/51 72 68/75
M12 86 80/87 125 117/128
M12x1.5 wheel screws 95 90/100
M16 210 194/214 310 285/314
M20 410 392/431 610 558/615
M24 710 675/743 1050 961/1059

Class 8.8

Class 10.9

Tightening torques for class 8.8 and 10.9 fasteners

All machine fastener torques should be regularly checked to the above table. In
particular, those for the flywheel blades, flywheel bearings, axle assembly, hitch,
road wheels and engine mounts.

P a g e | 22

Service schedule

Briggs engine Wood chipper

After first

5 Hrs

Every 8

Hrs

(Daily)

After first

10 Hrs

After first

20 Hrs

Every 20

Hrs

After first

50 Hrs

Every 50

Hrs

Every

100 Hrs

Every

200 Hrs

Every

250 Hrs

Tighten hydraulic fittings

●

Check fasteners

●

Check engine oil level &
top up if necessary

●

Clean around muffler
and controls

●

Visual check for fluid
leaks

●

Check drive belts

●

Grease via central point
on control panel

●

Change hydraulic filter
cartridge

●

Check brake adjustment
(wheeled only)

●

Check flywheel shaft
bearings

●

Check cutting blade &
anvil condition, change if
required

●

Change oil & filter

●

Check fuel hoses and
clamp bands

●

Check feed roller
tension springs &
replace if required

●

Check wear mark on
towing hitch (wheeled
only)

●

Clean air filter element

●

Check battery electrolyte
level

●

Re-sharpen feed rollers
as required

●

Replace Spark plugs

●

Check air intake hose

●

Check valve clearance

●

Check & recharge
battery

●

Service Schedule

P a g e | 23

Service schedule

Briggs engine Wood chipper

Every

400 Hrs

Every

500 Hrs

Every

800 Hrs

Every

1000 Hrs

Every

1500 Hrs

Every

2000 Hrs

Every

3000 Hrs

Every 12

months

Every 2

years

Every 5

years

Replace fuel filter

●

Change feed roller
bearings on motor side

●

Clean out fuel tank

●

Check & recharge
battery

●

Change hydraulic filter
cartridge

●

Change hydraulic oil

●

Get the machine
overhauled by a service
specialist

●

Change air filter element

●

Check wiring for
damage & loose
connections

●

Replace battery

●

Replace fuel hoses &
clamp bands

●

Change air intake hose

●

Change hydraulic hoses

●

Service Schedule

P a g e | 24

Covers: engine, chipping chamber, side panels

COVER OPENING SEQUENCE, A then B

Figure 7

Figure 8

1

LEFT SIDE PANEL CAN BE REMOVED FOR
ACCESS TO FEED ROLLER TENSION SPRING
ANCHORS. OPPOSITE SIDE PANEL CAN ALSO BE
REMOVED

2

4 x FASTENERS

1

ENGINE COVER LATCH

2

2x M12 SCREWS SECURE COVER
IN CLOSED POSITION

P a g e | 25

Engine bay

Figure 9

1

SIDE PANELS

2

CHIPPING CHAMBER COVER FIXING SCREWS

3

TOP FEED ROLLER LIFTING TOOL SOCKET

1

AIR FILTER

2

ENGINE OIL FILLER CAP

3

HYDRAULIC OIL TANK

4

FUEL FILTER

5

CHIPPING CHAMBER COVER FIXING

6

DIP STICK

7

ANVIL CLAMP BOLT

P a g e | 26

Figure 10

1

FLYWEEL PULLEY RETENTION PLATE

2

FLYWHEEL DRIVE BELTS

3

BELT TENSIONER DEVICE AND PULLEY

4

ENGINE OIL FILTER

P a g e | 27

Blade Changing

WARNING – Rigger Gloves must be worn whilst changing the blades
WARNING – It is essential that only genuine parts are used guaranteeing the correct

grade of Blade, bolt, washer and nut

1. Turn off chipper and remove the ignition keys

2. Disconnect battery leads

3. Remove the two bolts holding the chipping chamber lid closed (pic 1)

4. Carefully open the chipping chamber lid from the chute side and let it come to
rest on the hinge stops

5. Turn flywheel to blade change position (pic 2)

6. Insert locking timber (pic 2)

7. Clean all debris from around the blade bolt and nut with a metal pick

8. With a 24mm socket undo the two blade bolt nuts and remove both bolts/nuts
and washers steadying the blade with the other hand making sure it doesn’t
fall – WARNING these blades are sharp, rigger gloves must be worn

9. Carefully remove the blade from the flywheel

10. Clean blade seat on the flywheel thoroughly before fitting new or re­sharpened blades WARNING – the blades must not have any debris
underneath them when tightened, the smallest amount of debris behind the
blade could result in the blade coming loose causing damage to the machine

11. Re-fit blades, with new bolts, washers and nuts in the order shown in (pic 3)

12. Shims may be required to keep the gap between the blade and the anvil on
the inner edge (closest to the flywheel shaft) at 1mm – see page 28, Figure 15

13. A calibrated torque wrench must be used to tighten the blade bolts to a torque
setting of 310NM

14. Remove locking timber, rotate flywheel to next blade position and repeat 6-13

15. Close chipping chamber lid and re-fit bolts tightening to 86NM

16. Re-fit battery leads

WARNING – Failure to keep blades sharp will overload the engine and bearings
which could result in machine breakdown.

Blades must not be used beyond the wear mark (pic 4) failure to comply with this
could result in damaging the machine, injury or loss of life

Pic 1

Pic 2

P a g e | 28

Blade sharpening

For optimum performance, blades need to be kept sharp. Minimum safe blade size
after sharpening is shown in Figure 11. After sharpening, the blade gap must be re­set by using a blade shim as shown in

Figure 12. Shims are available in thicknesses of 0.5, 1, 1.5, 2 & 2.5mm as part
number 12-03-093. On no occasion must more than one shim be fitted under each
blade at any time. A gap of 1mm must be set from the inner blade tip to anvil after
sharpening by placing an appropriate shim under the blade (also see flywheel
assembly). The outer blade tip is automatically set due to the anvil being set at an
angle to the blade. With 1mm at the inner blade tip, the outer blade tip should be
3mm from the anvil as shown in
Figure 13.

The complete blade fastener set must be replaced every time blades are changed
and torqued up to 310 Nm.

DO NOT Lubricate the Bolts when fitting.

Blade sharpening wear limit
80mm to 60mm

Figure 11

Figure 12

1

Flywheel

2

Flywheel blade

3

Blade shim

4

M16 10.9 hex nut

5

M16 x 45Lg 10.9 CSK hex
socket screw

6

M16 serrated lock washer

P a g e | 29

Figure 13

Hydraulic oil filter

1

SIDE ANVIL

2

ANVIL

3

OUTSIDE BLADE GAP

4

FLYWHEEL BLADE

5

INSIDE BLADE GAP

P a g e | 30

Use protective plastic gloves to keep oil off skin, dispose of oil and filter in an
environmentally responsible manner.

1. The filter housing is accessed under the engine cover, in the top of the
hydraulic tank.

2. Unscrew filter housing top, remove filter element and replace.

3. Screw on and tighten filter body with new filter element into filter housing.

Oils, Fluids and Lubricants
Engine Oil: Synthetic 5W/30

Please consult your supplied Briggs & Stratton engine operator’s manual for oil
quantities relating to your engine type.

Hydraulic Oil: ISO VG 46.

It is advised that the oil is checked and topped up to the FILL LINE on the side of the
hydraulic tank, when the machine is cold and on a level surface.

Grease: Lithium EP2 General Purpose. The greasing points can be found on the

control panel. Please do not over grease 2 x pumps per grease nipple should be
sufficient.

P a g e | 31

Drive belt tension

The flywheel V belts must be checked for tension and condition. If any belt shows
signs of wear, surface damage, shredding, excessive glazing, or have been
stretched to their limit, they must be replaced. Multiple belt drives must have all belts
replaced at the same time. Belts that are too slack will cause poor cutting
performance, excessive belt and pulley wear.

All drive belts are located under the engine cover as shown in Figure 10 and tension
checked at arrows shown in Figure 14, Check and set tension as follows:

1. Slacken clamp screw(s) or nut.

2. Turn adjuster nut or screw to tension belt until 4.5Kg force at the belt longest
centre span deflects by 6mm (see Figure 14). Can be approximated by firmly
gripping belt between finger and thumb and twisting. The belt should not be
able to be rotated more than 90°.

3. Tighten all lock nuts, nuts and clamp screws.

4. Run machine and test.

5. Check belt tension.

Figure 14

1

FLYWHEEL DRIVE BELTS. CHECK TENSION HERE

P a g e | 32

Battery

Battery safety information

1. Battery acid is highly corrosive. For safety reasons, wear eye protection when
handling a battery. Do not tilt battery as acid could escape from vents.

2. Keep children away from acid and batteries.

3. Battery emits highly explosive hydrogen gas when charged. Do not allow
fires, sparks, naked flames or smoking near the battery. Also avoid
electrostatic discharges and electrical sparks when dealing with cables and
electrical equipment.

4. First aid. If acid is splashed into eyes, immediately rinse with clean water for
several minutes and consult a doctor without delay. If acid is swallowed,
consult a doctor immediately. Neutralise acid splashes on the skin and
clothes immediately with acid neutraliser (a solution of water and soda/baking
soda) or soap suds, and rinse with plenty of clean water.

5. Battery case can become brittle. To help avoid this, do not store batteries in
direct sunlight. Discharged batteries could freeze so store in a frost-free area.

6. Dispose of old batteries at an authorised collection point. Never dispose of in
household waste.

Storage and transport

1. As batteries are acid filled, always store and transport them upright and
prevent from tilting to avoid acid escape.

2. Store in a cool, dry, frost free place.

3. Do not remove the protective positive terminal cap.

4. Run a First-in First-Out (FIFO) warehouse management system.

Initial operation

1. Batteries are filled with acid at a density of 1.28g/ml at 15°C during
manufacture and are ready for use.

2. Recharge in case of insufficient starting power (see charging).

Battery removal & maintenance

To remove and replace battery:

1. Switch off engine and all electrical equipment.

2. To gain access to the battery, remove left side panel as shown in Figure 8 &
Figure 15.

3. Avoid short circuiting the battery terminals and from positive to any metal
machine part. Loose metal parts and tools commonly cause this.

4. Remove excessive debris from around the battery.

5. First remove negative lead at the battery, then the positive. Battery terminals
are the take-off type and fastened with an M6 screw in to a ferrule on the
cable end.

P a g e | 33

6. Slacken the M8 battery clamp screw.

7. Remove battery. Clean with a moist anti-static cloth to avoid electrostatic
discharge and explosion risk. Charge and check electrolyte level if
appropriate.

8. Clean out battery tray. Apply a thin film of petroleum jelly to terminals to
prevent corrosion.

9. Replacement is the reversal of removal. Ensure to replace/fit any vent pipes.
Leave at least one vent open otherwise there is an explosion risk. This also
applies to old batteries removed for disposal/recycling. Swap new battery
positive terminal protective cover to the old battery positive terminal to help
prevent short circuits and sparks.

Figure 15

Charging

1. Remove battery from machine, disconnect negative terminal first.

2. Ensure good ventilation.

3. Use suitable direct current mains chargers only.

4. Connect battery positive terminal to charger output positive. Connect the
negative terminal accordingly.

5. After connection, switch on charger. When charging is complete, switch off
charger then disconnect battery.

6. Charging current recommendation is 10% of the battery Ah power rating.

7. Use a charger with a constant charging voltage of 14.4V.

8. If the acid temperature rises above 38°C, stop charging.

9. The battery is fully charged when the charging voltage or acid specific gravity
has stopped rising for two hours.

Jump starting

1. Use a standardised jumper cable to DIN 72553 only and follow the
instructions.

1

TAKE-OFF BATTERY
TERMINALS FASTENED
WITH M6 SCREW

2

BATTERY

3

BATTERY CLAMP M8
SCREW

P a g e | 34

2. Only use batteries of the same voltage.

3. Switch off ignition on machine and support vehicle. The two must not touch
and all lights/equipment must be turned off.

4. Referring to Figure 16, connect in the sequence of 1 – 2 – 3 – 4 as shown and
as follows: Connect one end of the red jump lead to the machine battery
positive (+) terminal.

5. Connect the other end of the red jump lead to the support vehicle battery
positive (+) terminal.

6. Connect one end of the black jump lead to the support vehicle battery
negative (-) terminal.

7. Connect other end of the black jump lead to a machine metal part away from
the battery eg. onto the engine from under the chassis.

8. Make sure that the jump leads will not come into contact with moving parts.

9. Start the support vehicle engine and run at a medium idle speed for 15
seconds.

10. Start machine and run for 15 seconds.

11. Disconnect jump leads in the reverse order 4 – 3 – 2 – 1.

Figure 16

Taking battery out of service

1. Charge the battery and store in a cool but frost free place or on the vehicle
with the negative terminal disconnected.

2. Check the battery charge at regular intervals. Recharge if necessary.

A

Support vehicle battery

B

Machine battery

P a g e | 35

Parts lists

Hopper tray touch sensor

P a g e | 36

Chipping chamber assembly

Ite m No Pa rt No Des cripti on Qua ntity
1 12-11-020 Bearing & h ousi ng 1
2 12-10-075 G1/8in BSPP 4mm ma le s tud coupling 1
3 12-A-010 Fl ywheel as s y 1
4 12-01-064 Flywheel bea ri ng hous i ng 1
4a 12-01-064.1 Bearing 1
5 24-19-055 Top fe ed rol ler hous ing 1
6 24-19-054 Sens or folding hoppe r tra y a ss y 1
7 24-19-013 Chipp i ng chamber with ho pper 1
8 12-12-505 M10 x 20lg 10.9 CSK he x socke t screw 2
9 12-01-002 Side a nvil 1
10 12-12-1100 M16 x 35Lg 10.9 He x Hea d s crew 4
11 12-14-006 M16 serrated lock was her DIN 6798-A17 4
12 22-03-090 Bea ri ng was her pla te 1

P a g e | 37

Chipping chamber assembly - Bottom feed.

Item No

Part No

Description

Quantity

1

24-19-065

Bottom feed roller and shaft

1
2

12-20-004

Rectangular key 30x8x7

1

3

12-01-053

Feed roller spherical bearing housing

1

4

12-01-052

Oilite 30 ID spherical bearing

1
5

12-01-062

Feed bearing clamp

1
6

12-14-009

M10 Washer ISO 7089

2
7

12-14-010

M10 spring washer DIN 128

2
8

12-12-509

M10 x 35Lg 8.8 Hex Head Screw

2
9

12-12-308

M5 x

20 Lg Socket Head Screw

– Zinc Blk.

4
10

12-01-049

Rigid shaft coupling 25 ID

1
11

12-19-133-D

Feed motor clamp

1
11a

12-03-201

Feed motor clamp shim

1
12

12-19-132-D

Feed motor

bracket fab. assy.

1
13

12-24-005

Hydraulic motor

1
14

12-12-609

M12 x 45 Lg 8.8 Socket Head Cap Screw

2
15, 16

12-10-195

M14 Spherical dished washer set

1
17

12-14-038

M14 Washer ISO 7089

1
18

12-13-018

M14 Nyloc nut ISO 7040

1

P a g e | 38

Chipping chamber assembly – Bottom feed & Anvil.

Ite m No Pa rt No De s cripti on Qua ntity
1 12-12-601 M12 x 50Lg 8.8 He x Hea d s crew 1
2 12-14-015 M12 Spri ng wa sher DIN 128 1
3 12-14-003 M12 Was her ISO 7089 1
4 12-01-003 An vil clamp 1
5 12-01-013 An vil 1
6 12-10-094 R1/8i n BSPT 4mm ma le s tud e lbow 1
7 12-12-502 M10 x 30Lg 8.8 He x Hea d s crew 3
8 12-99-008 M10 Serrated Wa s her 3
9 12-14-009 M10 Was her (i f required) 3
10 12-11-005 Sel f Ali gni ng Fl a nge Bearing 2Z 30 ID 1
11 12-03-042 Fee d roll e r bea ri ng s him 1
12 12-15-002 Tens ion s pring 7.01 wire 23.98 ID 31 turns 2

P a g e | 39

Chipping chamber assembly - Drive

Item No Part No Description Quantity
1 24-A-002 Belt tensioner with nylon pulley. 1
2 12-12-506 M10 x 25Lg 8.8 Hex Head screw 2
3 12-14-010 M10 Spring Washer DIN 128 2
4 12-14-009 M10 Washer ISO 7089 2
5 12-19-063 Pulley retainer 1
6 12-10-038 Taper lock bush 50 ID 1
7 12-10-299 Birn Pulley 507 OD x 44 wide 2 groove 1
8 12-10-071 Inductive proximity sensor kit 1
9 12-10-085 Shim 50 ID x 62 OD x 0.5 THK DIN 988 1
10 12-10-071 Inductive proximity sensor kit 1
11 12-10-086 Shim 50 ID x 62 OD x 1 THK DIN 988 1

P a g e | 40

Chipping chamber assembly - Flywheel drive.

Item No Part No Description Quantity
1 12-10-305 V Belt - B75 2

P a g e | 41

Chipping chamber assembly - Bottom feed roller cover.

Item No Part No Description Quantity
1 12-12-504 M10 x 20Lg 8.8 Hex Head screw 2
2 12-14-010 M10 Spring Washer DIN 128 2
3 12-14-009 M10 Washer ISO 7089 2
4 12-03-045 Feed roller cover 1

P a g e | 42

Chute assembly

Item No Part No Description Quantity
1 12-19-056.B Chute clamp fab assy 2
2 12-20-001 Spring Pin Slotted 10 DIA x 30Lg ISO 8752 2
3 12-19-164 M16 Chute Clamp Assy. 2
4 12-19-051.B Chute fab assy 1
5 12-11-007 Plain bearing 12 ID, 16 OD, 22 flange x 10 Lg 4
6 12-14-003 M12 Washer ISO 7089 6
7 12-13-003 M12 nyloc nut ISO 7040 3
8 12-01-043 Hood hinge stud 1
9 12-19-151.B Chute hood fab assy 1
10 12-30-024 Forst small orange decal 2
11 12-15-020 M12 Elastomer washer OD 25-ID 12 x 5 THK 2
12 12-19-055.B Chute handle - standard 1
13 12-10-004 M12 female steel handle 1
14 12-14-004 M12 Washer extra large OD 44 x 4 THK ISO 7094 2

P a g e | 43

Top feed roller assembly

P a g e | 44

Flywheel assembly

BLADE SHIM

THICKNESS AVAILABLE

Part No

Thickness

12-03-093.05

0.5mm

12-03-093.10

1mm

12-03-093.15

1.5mm

12-03-093.20

2mm

12-03-093.25

2.5mm

Note: Blade Bolt Set (Bolt, Washer & Nut) Part No

99-99-099

P a g e | 45

Fuel tank assembly

Item No Part No Description Quantity
1 24-02-003 Fuel tank 35L moulded assy 1
2 24-02-005 Petrol tank cap 1
3 12-14-008 M12 Bonded washer (Dowty) 2
4 12-10-027 Banjo M12 1
5 12-10-026 Banjo bolt M12 1

P a g e | 46

Hydraulic Pump Assembly

Item No.

Part Number

Description

Quantity

1

12-24-061

Hydraulic single pump 8cc

1

2

12-12-403

M8 Bolt x 40mm

4 3 12-14-013

M8 Plain washer

4 4 24-03-036

Pump bracket assy.

1

5

12-14-013

M8 Plain washer

4

6

12-13-011

M8 Nyloc nut

4

7

12-12-302

M6 Bolt x 12mm

4

8

12-14-018

M6 Spring washer

4 9 12-14-017

M6 Plain washer

4

10

24-10-001

Spider coupling

1

11

24-01-057

PTO Shaft

1

P a g e | 47

Light board assembly

Note: Light guards available on request Part no.

24-19-067

Item No.

Part No

Description Quantity

1

12-10-248

Tail light

- left

1
1a

12-10-249

Tail light lens

- left

1
2

12-10-250

Tail light

- right

1
2a

12-10-252

Tail light lens

- Right

1
3

Trailer number plate

1

4

12-12-626

Nylon push on rivets

4

5

12-10-100

Side reflector amber

2
6

12-99-006

M4 x 10 Pan head pozi screw

6
7

12-14-021

M4 Spring washer ISO 128

6
8

12-14-020

M4 Washer ISO 7089

6
9

12-10-097

Number plate holder

2
10

24-19-063

Light board fab assy

1
11

12-14-017

M6 washer ISO 7089

4
12

12-13-015

M6 nyloc nut ISO 7040

4
12-10-252

LED loom complete

1
12-10-253

Curly cable

1

P a g e | 48

Belt Tensioner assembly

Item No.

Part No.

Description

Quantity

1

24-01-060

Belt tensioner nylon pulley

1

2

24-05-003

Belt tensioner spacer

2

3

24-03-169

Belt tensioner plate

1

4

12-11-011

6304 2RS Deep groove ball bearing

2

5

12-12-211

M20 x 100 lg. 8.8 Hex bolt

1

6

12-10-182.P

M20 Nyloc nut

1

P a g e | 49

Running gear – hitch & axle

Please refer to maintenance instruction manual supplied with the machine.

Hydraulics circuit diagram

1

Motor

2

Control valve

3

Test point

4

Tank Filter

5

Pump

6

Oil tank

P a g e | 50

Electrical circuit diagram – Mechanical & touch sensor
hopper

Engine Loom

P a g e | 51

Decals

Decal meaning:

1. Throttle movement relation to engine speed.

2. CE (Conformite Europeene or European Conformity) mark. Manufacturer’s
declaration that the product complies with the essential requirements of the
relevant European health, safety and environment protection legislation.

3. Ignition switch stop.

4. Hearing and eye protection of an appropriate specification to be worn.

5. Finger and toe amputation hazard.

6. Refer to user manual.

7. Allow machine to stop before touching.

8. Danger from flying objects.

9. Do not open or remove covers while engine is running.

10. Keep away from rotating machine parts.

11. Push to stop, trip bar operation.

These decals are placed on the machine where the hazard or information applies.

P a g e | 52

Manufacturer’s Statutory Plate

Information on the Manufacturer’s Statutory Plate in line order from top to bottom is
as follows:

1. Manufacturing company.

2. Vehicle type approval number and construction date.

3. 17 digit Vehicle Identification Number (VIN) construction.

4. Gross Vehicle Weight (GVW).

5. 0- Nose weight.

6. 1 - Axle mass.

7. 2 - Location.

P a g e | 53

Warranty

Warranty statement

1. Redwood Global Ltd guarantee all Forst equipment supplied by them

against any defect in manufacture and assembly – this guarantee is for a
period of 12 months commencing on the date of sale to the first end user.

2. The guarantee will not apply to a failure where normal use has exhausted

the life of a component.

3. Engine units are covered independently by their respective manufacturer’s

warranties.

4. Redwood Global Ltd’s liability under this guarantee is limited to repair at

Redwood Global Ltd’s premises or at a selected Forst dealer.

5. No liability will be accepted for consequential lost or damage of any kind.

6. The Redwood Global Ltd guarantee is restricted to the first Redwood

Global Ltd user only and is not transferable except when authorized by
Redwood Global Ltd.

7. The owner is responsible to make sure the machine is operated at all

times in accordance with the user manual.

8. The Redwood Global Ltd guarantee will be invalidated if any of the

following points apply:

 Failure to use genuine Forst parts
 Failure to perform routine servicing and maintenance
 Failed parts or assembly have been interfered with
 Machine has been modified without written approval from Redwood

Global Ltd

 Machine has been used to performed tasks contrary to those stated

in the Redwood Global Ltd User Manual

 Exclusions to the above warranty terms are – fair wear and tear on

fuses and bulbs, tyres and brakes, lubrications and filters, blades
and anvils, feed rollers and paintwork.

 Where an extended warranty has been given this will be stated on

the original machine invoice and will be subject to further conditions
as stated in our supplementary warranty terms

Warranty claims

To obtain warranty service please contact Redwood Global Ltd for the nearest
approved Forst Dealer. Your nearest dealer can be obtained from Redwood Global
Ltd at the address on the front of the User Manual. In the event of a failure Redwood
Global Ltd must be notified within 7 working days.

P a g e | 54

CE Certificate

CERTIFICATE & DECLARATION OF CONFORMITY

FOR CE MARKING

Company contact details:

Redwood Global Ltd,

Unit 86, Livingstone Road, Walworth Business Park, Andover,

Hampshire. SP10 5NS. United Kingdom

Redwood Global Ltd declares that their:

Wood Chippers listed as the following models

ST6p Towed
ST6 Towed & TR6 on Tracks
ST8 Towed & TR8 on Tracks

are classified within the following EU Directives:

Machinery Directive 2006/42/EC

Electromagnetic Compatibility Directive 2004/108/EC

and further conform with the following EU Harmonized Standards:

EN13525:2005 + A2:2009

EN 982:1996+A1:2008

EN ISO 12100:2010
EN ISO 14982:2009

Dated: …………………………

Position of signatory: Managing Partner

Name of Signatory: Raymond Gardner

Signed below:

…….……………………………….

on behalf of Redwood Global Ltd