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FORST ST8D55 Operator And Maintenance Manual

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OPERATOR AND
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Summary of Contents for FORST ST8D55

  • Page 1   OPERATOR AND MAINTENANCE MANUAL...
  • Page 2 The English language is used for the original instructions. Other languages are a translation of the original instructions. (Directive 2006/42/EC)
  • Page 3 DISCLAIMER This manual has been written by Redwood Global Ltd, to detail the safe operation and maintenance of the Först ST8D55 machine. This document provides information on the design of the product, procedures for routine maintenance, servicing, operating instructions and offers a troubleshooting guide to follow in the event of an unexpected occurrence.

  • Page 4: Table Of Contents

    Redwood Global Ltd- ST8D Operator and Maintenance Manual CONTENTS Preface Description of the user Purpose of these instructions Conventions in this document Left-hand and right-hand side Obtaining documentation and information Chapter 1: Machine Overview 1.1  Intended use 1.2  Technical data 1.3  Exterior components 1.4  Engine compartment overview 1.5  Chipping chamber overview...
  • Page 5 Redwood Global Ltd - ST8D Operator and Maintenance Manual Chapter 3: Transportation and storage 3.1  Connecting to the tow vehicle 3.2  Transporting the ST8D 3.3  Towing the machine 3.4  Disconnecting from the tow vehicle 3.5  Machine lifting 3.6  Removing the discharge chute 3.7  Storage 3.7.1  Preparing the machine for storage 3.7.2  Put into storage...
  • Page 6 Redwood Global Ltd- ST8D Operator and Maintenance Manual 5.6  Routine cleaning 5.6.1  Pressure washing 5.7  Opening the bonnet 5.8  Opening the chipping chamber cover 5.9  Removing the panel 5.10  Changing the blades 5.11  About blade sharpening 5.12  Turning or replacing the main anvil 5.13  Adjusting the main belt tension 5.14  Hydraulic oil filter 5.15  Changing the hydraulic filter...
  • Page 7 Redwood Global Ltd - ST8D Operator and Maintenance Manual Hydraulics schematic FörstAssist Warranty Warranty statement Warranty Claims Certification Service record Index 14-00-003 v3.1...
  • Page 8 Redwood Global Ltd- ST8D Operator and Maintenance Manual FIGURES Figure 1 - Exterior components, right-hand side view Figure 2 - Exterior components, left-hand side view Figure 3 - Engine left-hand side Figure 4 - Engine right-hand side Figure 5 - Chipping chamber Figure 6 - Feed roller controls Figure 7 - Control panel Figure 8 - Emergency stop buttons...
  • Page 9 Redwood Global Ltd - ST8D Operator and Maintenance Manual Figure 35 - Hopper tray locked down Figure 36 - Key in the ON position Figure 37 - Key in the engine crank position Figure 38 - Increase speed Figure 39 - Feed roller controls Figure 40 - Feed roller speed adjustment Figure 41 - Idle Figure 42 - Key in the OFF position...
  • Page 10 Redwood Global Ltd- ST8D Operator and Maintenance Manual Figure 71 - Anvil in vertical seat Figure 72 - Correct main belt tension Figure 73 - Main belt tensioner (arrow indicates the direction of tension) Figure 74 - Hydraulic oil filter Figure 75 - Hydraulic filter Figure 76 - Drain hydraulic oil Figure 77 - Battery terminals...
  • Page 11 Redwood Global Ltd - ST8D Operator and Maintenance Manual TABLES Table 1 - Technical data Table 2 - Safety and function test Table 3 - Weekly checks Table 4 - Shim part numbers Table 5 - Oils, fluids and lubricants Table 6 - Torque settings Table 7 - Tools and accessories 14-00-003 v3.1...

  • Page 12: Preface

    Redwood Global Ltd- ST8D Preface Operator and Maintenance Manual PREFACE DESCRIPTION OF THE USER These instructions are intended for the end-user of the ST8D. The end-user can be described as each person who interacts directly with the machine. The end-user typically includes, but is not limited to:  ...

  • Page 13: Purpose Of These Instructions

    Redwood Global Ltd - ST8D Preface Operator and Maintenance Manual PURPOSE OF THESE INSTRUCTIONS Thank you for purchasing/hiring this Redwood Global Ltd, Först wood chipping machine. The purpose of this document is to make you familiar with the operation and maintenance of the machine, so that you can safely operate it as an end-user.

  • Page 14: Conventions In This Document

    Redwood Global Ltd- ST8D Preface Operator and Maintenance Manual CONVENTIONS IN THIS DOCUMENT This document uses the following safety notices and tips: DANGER Indicates a hazardous situation which, if not avoided, will result in death or serious injury. WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

  • Page 15: Left-Hand And Right-Hand Side

    In this manual "left-hand" and "right-hand" mean your left and right when you are standing facing forward, feeding material into the machine. OBTAINING DOCUMENTATION AND INFORMATION The latest version of the documentation is available at the following address: https://forstglobal.com/my-forst/manuals 14-00-003 v3.1...
  • Page 16 Redwood Global Ltd- ST8D Preface Operator and Maintenance Manual This page intentionally left blank 14-00-003 v3.1...

  • Page 17: Chapter 1: Machine Overview

    CHAPTER 1: MACHINE OVERVIEW In this chapter: 1.1  Intended use 1.2  Technical data 1.3  Exterior components 1.4  Engine compartment overview 1.5  Chipping chamber overview 1.6  Autointelligence system 1.7  Feed roller controls 1.8  Control panel 1.9  Emergency stop buttons 1.10  Control Screen 1.10.1  Button Functions 1.10.2  Navigation 1.10.3  Home screen...

  • Page 18: Intended Use

    Operator and Maintenance Manual 1.1   INTENDED USE The Först ST8D55 is designed to reduce wood material up to 150mm (6 inch) wide in diameter to woodchip. This machine is capable of processing up to 5.5 tonnes of wood per hour.

  • Page 19: Technical Data

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.2   TECHNICAL DATA   Table 1 - Technical data   Technical Data ST8D Part number 14-A-032  Weight   Overall weight 1450kg  Engine   Engine Type Doosan D18  ...

  • Page 20: Exterior Components

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.3   EXTERIOR COMPONENTS 1 Control valve speed adjust Tow hitch head 2 Fuel tank Handbrake lever/cable 3 Prop stand 10 Lifting eye 4 Control panel Chute rotation clamp 5 Vehicle identification (vin) plate 12 Chute handle 6 Light socket...

  • Page 21: Figure 2 - Exterior Components, Left-Hand Side View

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual Jockey wheel handle Hopper tray buttons Spare wheel Red stop bar Hopper Hopper tray Battery Safety curtains Number plate Emergency stops Figure 2 - Exterior components, left-hand side view 14-00-003 v3.1...

  • Page 22: Engine Compartment Overview

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.4   ENGINE COMPARTMENT OVERVIEW To access the engine compartment: ► Refer to "Opening the bonnet" on page 98 Below are the components of the engine located on the left side of the machine. Hydraulic oil filler cap 3 Fuel filter 2 Sight glass...

  • Page 23: Figure 4 - Engine Right-Hand Side

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual Below are components located on the right side of the machine:   Diesel particulate filter (DPF) 7 Starter motor 2 Air filter assembly 8 Engine oil dip stick 3 Radiater filler cap 9 Engine oil filter 4 Cooling pack...

  • Page 24: Chipping Chamber Overview

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.5   CHIPPING CHAMBER OVERVIEW To access the chipping chamber: ► Refer to "Opening the chipping chamber cover" on page 99 Flywheel TFR lifting tool slot Flywheel blade Feed roller spring tensioner eye bolt Top feed roller (TFR) assembly  ...

  • Page 25: Autointelligence System

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.6   AUTOINTELLIGENCE SYSTEM The ST8D Woodchipper incorporates the Först Autointelligence system. This system monitors and manages the machine's electrical system. For example, the Autointelligence system:   Will stop and start the feed rollers, making sure that the cutting conditions remain within the optimum limits.

  • Page 26: Feed Roller Controls

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.7   FEED ROLLER CONTROLS Red stop bar The red stop bar (1, Figure 6) located on the folding tray is used to stop the feed rollers during normal operation. When pushed, the spring-loaded bar interrupts power to the feed rollers, and they stop instantly.

  • Page 27: Control Panel

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.8   CONTROL PANEL The control panel is located on the right-hand side panel. On the control panel you will find the following:   Screen Refer to "Control Screen" on page 29  ...

  • Page 28: Emergency Stop Buttons

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.9   EMERGENCY STOP BUTTONS WARNING Pushing an emergency stop button does not stop the engine. There are two emergency stops located on the top of the hopper. Push either of the emergency stops to stop the feed rollers instantly.

  • Page 29: Control Screen

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10   CONTROL SCREEN The control screen houses the Först Autointelligence software. The software maintains and controls all functionality of the machine.   The control screen also displays information for all aspects of the machine, such as:  ...

  • Page 30: Button Functions

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.1   BUTTON FUNCTIONS Each page displays different information therefore each button performs multiple functions depending on which screen is displayed. Figure 9 - Button functions Description Screen - displays information Minus button - press to switch between options of highlighted icon, this button also activates the DPF (Diesel Particulate Filter) forced regeneration sequence, or reduces engine speed...

  • Page 31: Navigation

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.2   NAVIGATION This section describes how to navigate within the software. Figure 10 - Screen navigation Description Minus button - when an icon is highlighted, press this button to navigate left through the icons options Left arrow - use this button to navigate left through the icons on the screen Menu - use this button to cycle through all screens on the control screen...

  • Page 32: Home Screen

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.3   HOME SCREEN The home screen displays by default once the machine is powered on. On the home screen you can see the actual engine speed, the target speed of the flywheel, the amount of fuel used and the engine running time since the last manual reset.

  • Page 33: Sensors And Dpf

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.4   SENSORS AND DPF The sensors and DPF page displays the sensor and DPF status. If a sensor is tripped the corresponding icon will illuminate or extinguish. Figure 12 - Sensors and DPF screen Description Forward button sensor - while this is active the icon illuminates green...

  • Page 34: Machine Information

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.5   MACHINE INFORMATION This screen displays all of the machines information such as its engine type and how many spokes it has. By default all features in this screen are locked and any changes to these settings are password protected.

  • Page 35: Active Engine Codes (Dm1)

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.6   ACTIVE ENGINE CODES (DM1) This screen displays any active fault codes. If your machine has a problem, the corresponding fault code displays on this screen. If this happens contact Först service personnel and quote the error code shown on this screen when asked.

  • Page 36: Historic Engine Codes (Dm2)

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.7   HISTORIC ENGINE CODES (DM2) this screen displays archived fault codes. Först service personnel may need to access this information to see a full history of your machine. You can navigate to this screen by pressing the menu button until the screen appears.

  • Page 37: Settings

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.8   SETTINGS In this screen you can adjust the pressure unit type, fuel unit type and the screen brightness. Figure 16 - Settings screen Description Brightness - displays the current brightness level Pressure unit - displays the unit of pressure you have selected Temperature unit - displays the unit of temperature you have selected Fuel unit - displays the unit of fuel you have selected...

  • Page 38: Alarm Splash Screen

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.10.9   ALARM SPLASH SCREEN If there is an alarm, the alarm splash screen appears. The screen shows details about the alarm Contact Först service personnel immediately and describe the alarm message displayed on screen.

  • Page 39: Ignition Switch

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.11   IGNITION SWITCH Figure 18 - Ignition switch Off position (1, Figure 18) This is the normal position when the machine is not in use.   On position (2, Figure 18) This is the normal operating position.

  • Page 40: Manufacturer's Statutory Plate

    Redwood Global Ltd- ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.12   MANUFACTURER’S STATUTORY PLATE Figure 19 - Manufacturer's statutory plate Information on the Manufacturer’s Statutory Plate in line order from top to bottom is as follows:   Manufacturing company and address  ...

  • Page 41: Vehicle Identification Number (Vin) Plate

    Redwood Global Ltd - ST8D Chapter 1: Machine Overview Operator and Maintenance Manual 1.13   VEHICLE IDENTIFICATION NUMBER (VIN) PLATE Figure 20 - Vehicle identification number Information on the VIN Plate in line order from top to bottom is as follows:  1.
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  • Page 43: Chapter 2: Safety Instructions

    CHAPTER 2: SAFETY INSTRUCTIONS In this chapter: 2.1  Safe working 2.2  General safety 2.3  Noise test information 2.4  Decals 14-00-003 v3.1...

  • Page 44: Safe Working

    Redwood Global Ltd- ST8D Chapter 2: Safety instructions Operator and Maintenance Manual 2.1   SAFE WORKING Before using this machine, make sure that you are trained and competent in its operation.    Know the location of and how to use all the safety features.   ...
  • Page 45 Redwood Global Ltd - ST8D Chapter 2: Safety instructions Operator and Maintenance Manual WARNING When the machine is In use, woodchip and debris are ejected with considerable force from the chute.   Make sure the discharge chute directs woodchip in a safe direction to avoid injury or property damaged WARNING Keep children and animals away from the working area.
  • Page 46 Redwood Global Ltd- ST8D Chapter 2: Safety instructions Operator and Maintenance Manual WARNING Keep all guards and shields around any moving parts in place while the machine is operational. WARNING Do not remove, jam, disable or otherwise impede the effectiveness of any stop and reset controls.
  • Page 47 Redwood Global Ltd - ST8D Chapter 2: Safety instructions Operator and Maintenance Manual CAUTION When operating the machine, be aware of your surroundings and work in a safe location.   Position the machine:   on as firm a surface as possible and stabilise the machine  ...

  • Page 48: General Safety

    Redwood Global Ltd- ST8D Chapter 2: Safety instructions Operator and Maintenance Manual 2.2   GENERAL SAFETY DO stop the machine before making any DO NOT use machine in poor visibility or adjustments, refuelling or cleaning. insufficient light to see clearly. DO make sure all moving parts in the DO NOT use or attempt to start the machine have stopped.

  • Page 49: Noise Test Information

    Redwood Global Ltd - ST8D Chapter 2: Safety instructions Operator and Maintenance Manual 2.3   NOISE TEST INFORMATION Machine Notes Tested chipping 50 x 50mm pine or an equivalent type of timber 4m in length. Noise levels above 97dB will be experienced at the working position and within a metre radius. ...

  • Page 50: Decals

    Redwood Global Ltd- ST8D Chapter 2: Safety instructions Operator and Maintenance Manual 2.4   DECALS Decal Description Decal Description CE (Conformité Ensure that all rotating Européenne or parts have stopped European before maintenance Conformity) mark. Manufacturer’s declaration that the product complies with the essential requirements of the relevant European...
  • Page 51 Redwood Global Ltd - ST8D Chapter 2: Safety instructions Operator and Maintenance Manual Decal Description Decal Description Use only close fitting Apply 2x parts of grease gloves, suitable to each grease nipple hearing protection once a week. and eye protection to protect against the risk of ejected material.
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  • Page 53: Chapter 3: Transportation And Storage

    CHAPTER 3: TRANSPORTATION AND STORAGE In this chapter: 3.1  Connecting to the tow vehicle 3.2  Transporting the ST8D 3.3  Towing the machine 3.4  Disconnecting from the tow vehicle 3.5  Machine lifting 3.6  Removing the discharge chute 3.7  Storage 3.7.1  Preparing the machine for storage 3.7.2  Put into storage 3.7.3  During storage 3.7.4  Take out of storage...

  • Page 54: Connecting To The Tow Vehicle

    Redwood Global Ltd- ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 3.1   CONNECTING TO THE TOW VEHICLE NOTICE When the machine is not connected to the tow vehicle:   The handbrake must be applied   The machine must be secured using two chocks, if available  ...

  • Page 55: Figure 24 - Tow Hitch Handle

    Redwood Global Ltd - ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 6. Wind the jockey wheel handle clockwise to lower the tow head onto the ball hitch. 7. Release the tow head handle and continue to wind the jockey wheel handle clockwise.

  • Page 56: Figure 25 - Tow Hitch Wear Indicator

    Redwood Global Ltd- ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual Figure 25 - Tow hitch wear indicator 11. Insert the barrel lock for security. 12. Connect the machine trailer extension plug into the vehicle trailer socket. 13. Check all machine lights and tow vehicle lights are working correctly. 14.

  • Page 57: Transporting The St8D

    Redwood Global Ltd - ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 3.2   TRANSPORTING THE ST8D The machine may be equipped with 4x tie down points, with 2x located on each side of the machine. To tie down the machine: Position the machine in the middle of the tie down area.

  • Page 58: Towing The Machine

    Redwood Global Ltd- ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 3.3   TOWING THE MACHINE Make sure that the machine is in transportation mode before departing: a. Hopper tray is closed in the up position, and the locking latch is fully engaged.

  • Page 59: Disconnecting From The Tow Vehicle

    Redwood Global Ltd - ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 3.4   DISCONNECTING FROM THE TOW VEHICLE WARNING The machine can roll back 25-30cm before the full braking force is applied. Make sure that there is sufficient space when parking the machine. CAUTION Make sure that the jockey wheel is fastened tight before unhitching the machine.

  • Page 60: Machine Lifting

    Redwood Global Ltd- ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 3.5   MACHINE LIFTING DANGER The lifting eye should not be used as the single point for lifting. WARNING When lifting the woodchipper, be aware that the lifting eye can securely hold the woodchipper’s weight only.

  • Page 61: Removing The Discharge Chute

    Redwood Global Ltd - ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 3.6   REMOVING THE DISCHARGE CHUTE DANGER Do not remove the rear chute clamp when removing the chute. Doing so will result in the chute falling. The discharge chute only needs to be removed for storage and transportation purposes.

  • Page 62: Figure 30 - Remove Clamp And Nut

    Redwood Global Ltd- ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 5. Remove both the clamp and the clamp nut and put them somewhere safe. Figure 30 - Remove clamp and nut 6. Loosen the rear clamp by rotating the clamp lever anti-clockwise. Figure 31 - Chute rear rotation clamp 7.

  • Page 63: Figure 32 - Remove Chute

    Redwood Global Ltd - ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual Figure 32 - Remove chute 14-00-003 v3.1...

  • Page 64: Storage

    Redwood Global Ltd- ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 3.7   STORAGE If the machine will not be used for an extended period, you must store the machine correctly. If you prepare the machine carefully and apply on-going care you can prevent deterioration and damage to the machine while it is in storage.

  • Page 65: Take Out Of Storage

    Redwood Global Ltd - ST8D Chapter 3: Transportation and storage Operator and Maintenance Manual 3.7.4   TAKE OUT OF STORAGE Remove any covers. 2. Examine all fluid levels. If necessary replace the fluid or add more fluid. 3. Check the pressure and condition of the tyres. 4.
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  • Page 67: Chapter 4: Operation

    CHAPTER 4: OPERATION In this chapter: 4.1  Preparation for use 4.2  Positioning the machine for use 4.3  Starting the Machine 4.4  Safety & function test Green and orange hopper buttons 4.5  Feed roller speed adjustment 4.6  Shutting down the machine 4.7  Removing blockages 14-00-003 v3.1...

  • Page 68: Preparation For Use

    Redwood Global Ltd- ST8D Chapter 4: Operation Operator and Maintenance Manual 4.1   PREPARATION FOR USE Do not attempt to operate a newly delivered machine before complying with the preparation for use instructions. The operator must be thoroughly familiar with the operating and safety instructions before using the machine.

  • Page 69: Positioning The Machine For Use

    Redwood Global Ltd - ST8D Chapter 4: Operation Operator and Maintenance Manual 4.2   POSITIONING THE MACHINE FOR USE WARNING Take care when lowering and lifting the hopper. Improperly handling the hopper can result in injury. CAUTION Obey all relevant safety warnings when positioning the machine for operation.For more information, refer to "Safety instructions"...

  • Page 70: Figure 34 - Hopper Tray Locking Latch

    Redwood Global Ltd- ST8D Chapter 4: Operation Operator and Maintenance Manual 2. Disengage both hopper tray locking latches (1, Figure 34). Figure 34 - Hopper tray locking latch 3. Lower the hopper tray in a controlled manner (do not drop the hopper tray). 4.

  • Page 71: Starting The Machine

    Redwood Global Ltd - ST8D Chapter 4: Operation Operator and Maintenance Manual 4.3   STARTING THE MACHINE Carry out daily checks before first use of machine everyday. To start safely, follow the start up procedure below. Insert the key into the ignition. 2.

  • Page 72: Figure 38 - Increase Speed

    Redwood Global Ltd- ST8D Chapter 4: Operation Operator and Maintenance Manual Figure 38 - Increase speed 6. Check the safety system is functioning correctly. ► For more information, refer to "Safety & function test" on page 73 7. The machine is now ready for use. Wait until the engine is warm before heavy use.

  • Page 73: Safety & Function Test

    Redwood Global Ltd - ST8D Chapter 4: Operation Operator and Maintenance Manual 4.4   SAFETY & FUNCTION TEST The safety & function test makes sure that the safety devices and controls on the machine are working correctly. WARNING If any of these checks fail, turn off the machine, remove the key from the ignition switch, and contact FörstAssist.
  • Page 74 Redwood Global Ltd- ST8D Chapter 4: Operation Operator and Maintenance Manual   Action Expected outcome   Turn the feed roller flow control valve between 1 and The speed of the feed rollers decreases and 15  increases. 16  Close the hopper tray. The feed rollers stop.

  • Page 75: Feed Roller Speed Adjustment

    Redwood Global Ltd - ST8D Chapter 4: Operation Operator and Maintenance Manual 4.5   FEED ROLLER SPEED ADJUSTMENT The feed roller speed can be adjusted to suit the material being chipped, refer to Figure 40.    1. Turn dial to align number with paint spot.  2.

  • Page 76: Shutting Down The Machine

    Redwood Global Ltd- ST8D Chapter 4: Operation Operator and Maintenance Manual 4.6   SHUTTING DOWN THE MACHINE To shut down safely, follow the procedure below. NOTICE Increase and decrease the engine speed slowly, especially during the first 50 hours of operation. Press the icon on the screen and reduce the speed to idle.
  • Page 77 Redwood Global Ltd - ST8D Chapter 4: Operation Operator and Maintenance Manual 4. Wait until the engine comes to a complete stop. 5. Remove the ignition key and keep it in a safe place.   14-00-003 v3.1...

  • Page 78: Removing Blockages

    Redwood Global Ltd- ST8D Chapter 4: Operation Operator and Maintenance Manual 4.7   REMOVING BLOCKAGES Be careful, whatever is fed into the machine has to come out of the discharge chute. DANGER Stop the engine before attempting to remove any blockages in the machine. Failure to do so may result in serious injury and loss of life.

  • Page 79: Figure 45 - Spring Hanger

    Redwood Global Ltd - ST8D Chapter 4: Operation Operator and Maintenance Manual Check the feed rollers: 8. Open the bonnet. 9. Open the chipping chamber cover. 10. Using a suitable tool, loosen the 4x nuts located on top of the 2x spring hangers. Figure 45 - Spring hanger 11.

  • Page 80: Figure 47 - Raising The Top Feed Roller Housing

    Redwood Global Ltd- ST8D Chapter 4: Operation Operator and Maintenance Manual 12. Lift the top feed roller (2, Figure 47) to the fully open position. 13. Insert one of the M12 chamber cover bolts (3, Figure 47) into the side of the feed chamber and screw completely in.
  • Page 81 Redwood Global Ltd - ST8D Chapter 4: Operation Operator and Maintenance Manual 16. Wearing protective gloves and using a piece of wood, carefully clear the blockage from inside the feed chamber. 14-00-003 v3.1...
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  • Page 83: Chapter 5: Maintenance

    CHAPTER 5: MAINTENANCE In this chapter: 5.1  Routine maintenance 5.2  Daily checks 5.3  Weekly maintenance checks 5.4  Engine maintenance 5.5  Aftertreatment System 5.5.1  Diesel particulate filter (DPF) 5.5.2  DPF regeneration 5.5.3  Stage V DPF regeneration 5.5.4  DPF regeneration methods 5.5.5  DPF regeneration lamp and switch 5.5.6  Regeneration mode during operation (passive and active regeneration) 5.5.7  Manual regeneration mode (forced regeneration) 5.5.8  Conditions for forced regeneration...
  • Page 84 Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.17.3  Replacing the battery 5.17.4  Charging the battery 5.17.5  Jump starting the battery 5.18  Oils, fluids and lubricants 5.19  Fastener tightening torques 5.20  Tools and accessories 5.21  Running gear – hitch & axle 5.22  Service Schedule 14-00-003 v3.1...

  • Page 85: Routine Maintenance

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.1   ROUTINE MAINTENANCE WARNING Make sure the key is removed from the ignition before commencing any service or maintenance on the machine. NOTICE When the machine is new, the hydraulic oil level may drop during initial use.  Regularly check and top-up until the 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. ...
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  • Page 87: Daily Checks

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.2   DAILY CHECKS Perform the following checks before putting the unit into operational service and before each operational day. Item Check Further action ✔ /✘ 1  Nuts, bolts and washers Visual check of all nuts, bolts, and washers for security secure Check the reflectors...
  • Page 88 Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual Item Check Further action ✔ /✘ Check the hopper tray 18  Secure hopper tray catches   19  Check the battery Terminals secure   Clamp secure   Check the bonnet catches Secure 20 ...

  • Page 89: Weekly Maintenance Checks

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.3   WEEKLY MAINTENANCE CHECKS Perform the following checks every week, or after every 8 hours of use. Table 3 - Weekly checks Item Check Further action ✔ /✘ 1 ...
  • Page 90 Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual Item Check Further action ✔ /✘   Hoses secure Visually check all hydraulic components 16    All components free of leaks 17  Check the safety decals Decals are fitted, legible and undamaged  ...

  • Page 91: Engine Maintenance

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.4   ENGINE MAINTENANCE Please refer to the engine manual supplied with this machine for the following:   Checking the engine oil.   Changing the engine oil and oil filter.  ...

  • Page 92: Aftertreatment System

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.5   AFTERTREATMENT SYSTEM 5.5.1   DIESEL PARTICULATE FILTER (DPF) The DPF (Diesel Particulate Filter) system serves to prevent particulate matter (PM) in emissions from being discharged into the air and consists of a DPF body, one exhaust gas temperature sensors, and one differential pressure sensor.

  • Page 93: Stage V Dpf Regeneration

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.5.3   STAGE V DPF REGENERATION Step Soot Quantity Torque de-rate Remark Lamp No action (passive regeneration Below 99% dependent on machine CUP) To start active regen. With high 100-105% temp.

  • Page 94: Dpf Regeneration Methods

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.5.4   DPF REGENERATION METHODS Stage V engines are designed to perform passive regeneration of soot accumulated in the DPF even under normal exhaust conditions without needing to be initiated by the operator.

  • Page 95: Dpf Regeneration Lamp And Switch

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.5.5   DPF REGENERATION LAMP AND SWITCH The HEST (High Exhaust System Temperature) Lamp notifies the operator when hot exhaust gas is being discharged from the engine during DPF regeneration. Be sure to keep the area around the exhaust manifold free of flammable materials.

  • Page 96: Regeneration Mode During Operation (Passive And Active Regeneration)

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.5.6   REGENERATION MODE DURING OPERATION (PASSIVE AND ACTIVE REGENERATION) The regeneration mode is performed automatically by the ECU to regenerate the DPF when any of the following regeneration modes are met. During regeneration, the regeneration lamp and HEST lamp turn on to warn the operator of the hot exhaust gas.

  • Page 97: Removing Ash And Cleaning The Dpf

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.5.10   REMOVING ASH AND CLEANING THE DPF During the regeneration soot in the DPF, ash accumulates in the DPF. Once a certain amount of ash accumulates, engine performance and fuel efficiency are affected due to a build up of back pressure from the exhaust system, so ash cleaning must be performed regularly to prevent any worsening of engine performance or fuel efficiency.

  • Page 98: Opening The Bonnet

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.7   OPENING THE BONNET To access the engine: Stop the engine. 2. Remove the key from the ignition and keep in a safe place. 3. Release the two bonnet catches. 4.

  • Page 99: Opening The Chipping Chamber Cover

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.8   OPENING THE CHIPPING CHAMBER COVER To access the chipping chamber: Stop the engine. 2. Remove the key from the ignition and keep in a safe place. 3.

  • Page 100: Figure 55 - Open Chipping Chamber Cover

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual Figure 55 - Open chipping chamber cover NOTICE When closing the chipping chamber, carry out these tasks in reverse. When installing the two chipping chamber cover bolts bolts, torque to 86Nm. 14-00-003 v3.1...

  • Page 101: Removing The Panel

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.9   REMOVING THE PANEL Removing the panel will give you access to the following:   Hydraulic oil filter   Outer feed roller spring   Battery To remove the side panel: Stop the engine.

  • Page 102: Changing The Blades

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.10   CHANGING THE BLADES CAUTION Failure to keep blades sharp will affect chipping performance and prematurely increase machine wear and tear which could result in a machine breakdown. WARNING The blades must not be used beyond the wear mark.

  • Page 103: Figure 60 - Flywheel Locking Tool

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 6. Refer to "Opening the chipping chamber cover" on page 99 Figure 60 - Flywheel locking tool 7. Turn the flywheel until it is in the locking position. (Figure 61). 8.

  • Page 104: Figure 62 - Blade Removal

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual Figure 62 - Blade removal Installing the replacement blades: CAUTION Use genuine Först blades and blade bolt sets only. Replace the blade bolt sets every time the blades removed CAUTION When fitting a blade bolt set, NO lubricant or anti-seize compound is to be applied to bolts.

  • Page 105: Figure 63 - Correct Position Of The Back Edge Of The Blade

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual Figure 63 - Correct position of the back edge of the blade CAUTION Shims may be required to keep the gap between the blade and the anvil on the inner edge (closest to the flywheel shaft) at 3mm.

  • Page 106: About Blade Sharpening

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.11   ABOUT BLADE SHARPENING For optimum performance, keep the blades on the woodchipper sharp. Only professionals can sharpen blades for the woodchipper. Blade sharpening requirements The minimum safe blade size is shown in Figure 1. Figure 64 - Blade sharpening wear limit: 80mm to 60mm •...

  • Page 107: Figure 65 - Blade Gaps

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual Side Anvil Flywheel Blade Anvil Inside Blade Gap Outside Blade Gap     Figure 65 - Blade gaps When changing the blades, make sure each blade bolt set is replaced every time the blades are changed.

  • Page 108: Turning Or Replacing The Main Anvil

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.12   TURNING OR REPLACING THE MAIN ANVIL If an anvil is worn or damaged, turn or replace it with a new one. You can turn an anvil 180° to use it a second time. Stop the engine.

  • Page 109: Figure 68 - Anvil Removed

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual Figure 68 - Anvil removed 11. Check the anvil seats inside the chamber for damage or wear. 12. Make sure the anvil seats are free from dirt and debris before inserting anvil. (4, Figure 69).

  • Page 110: Figure 70 - Anvil Tight To The Bedplate

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual Figure 70 - Anvil tight to the bedplate 15. Push the anvil along the lower seat. 16. Push the anvil into the seat under the side anvil (6, Figure 71). Figure 71 - Anvil in vertical seat 17.

  • Page 111: Adjusting The Main Belt Tension

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.13   ADJUSTING THE MAIN BELT TENSION The flywheel 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. ...

  • Page 112: Figure 73 - Main Belt Tensioner (Arrow Indicates The Direction Of Tension)

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual Figure 73 - Main belt tensioner (arrow indicates the direction of tension) 6. Close the bonnet. 7. Start the engine. 8. Allow the engine to idle for 30 seconds. 9. Turn off the engine. 10.

  • Page 113: Hydraulic Oil Filter

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.14   HYDRAULIC OIL FILTER CAUTION Suitable gloves must be worn in order to avoid skin contact with corrosive or harmful liquids. CAUTION When disposing of liquids and filters, the disposal guidelines specified by the local authorities must be followed.

  • Page 114: Changing The Hydraulic Filter

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.15   CHANGING THE HYDRAULIC FILTER CAUTION Suitable gloves must be worn in order to avoid skin contact with corrosive or harmful liquids. CAUTION When disposing of liquids and filters, the disposal guidelines specified by the local authorities must be followed.

  • Page 115: Figure 75 - Hydraulic Filter

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual Figure 75 - Hydraulic filter 14-00-003 v3.1...

  • Page 116: Draining The Hydraulic Oil

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.16   DRAINING THE HYDRAULIC OIL CAUTION Use suitable protective gloves to avoid contact with skin. CAUTION Use suitable protective eye wear to protect eyes from contact with oil. CAUTION Use approved local authority environmental procedures when disposing of fluids.

  • Page 117: Battery

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.17   BATTERY Before using and charging batteries, read the following safety information: WARNING Battery acid is highly corrosive. Always wear eye protection when handling a battery. Do not tilt battery as acid could escape from vents. WARNING Keep children away from acid and batteries.

  • Page 118: Replacing The Battery

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.17.3   REPLACING THE BATTERY You can replace an old battery with a new one. Stop the engine. 2. Remove the key from the ignition and keep in a safe place. 3.

  • Page 119: Charging The Battery

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.17.4   CHARGING THE BATTERY If the woodchipper has a flat battery, charge the battery. NOTICE When charging the battery, take the following into consideration: • Ensure good ventilation •...

  • Page 120: Jump Starting The Battery

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.17.5   JUMP STARTING THE BATTERY If the woodchipper has a flat battery, you can use a support vehicle to jump start the battery. CAUTION When attaching jump leads to a battery, make sure that only the lead ends make contact with the battery terminals.

  • Page 121: Oils, Fluids And Lubricants

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.18   OILS, FLUIDS AND LUBRICANTS Table 5 - Oils, fluids and lubricants Oils, Fluids, and Lubricants Item Assembly Product 1  Engine oil 5w30 API SJ or higher (fully-synthetic) 2 ...

  • Page 122: Fastener Tightening Torques

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.19   FASTENER TIGHTENING TORQUES All machine fastener torques should be regularly checked in accordance with the table below. In particular, those for the flywheel blades, flywheel bearings, axle assembly, hitch, road wheels and engine mounts.

  • Page 123: Tools And Accessories

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.20   TOOLS AND ACCESSORIES The following is a list of tools and accessories supplied with the machine. Table 7 - Tools and accessories Item Part Number Quantity Item Description Reference 1 ...

  • Page 124: Running Gear - Hitch & Axle

    Redwood Global Ltd- ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.21   RUNNING GEAR – HITCH & AXLE Först uses AL-KO Kobler break drums. Please refer to maintenance instruction manual supplied with the machine. Check the internal diameter of the wheel drum for ware. The brake drum also shows wear over time and must be replaced when the minimum measure is no longer met.

  • Page 125: Service Schedule

    Redwood Global Ltd - ST8D Chapter 5: Maintenance Operator and Maintenance Manual 5.22   SERVICE SCHEDULE The service schedule must be carried out by a competent person familiar with the machine. Hours of Tasks Requirements and part operation number Replace the hydraulic filter element 12-24-028 To pup hydraulic oil, if required VG ISO 46...
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  • Page 127: Chapter 6: Troubleshooting

    CHAPTER 6: TROUBLESHOOTING In this chapter: 6.1  The engine doesn't crank 6.2  The engine cranks but doesn't fire 6.3  The display screen is blank 6.4  The feed rollers are not turning 6.5  The woodchipper suddenly stops running 6.6  The woodchipper is struggling to chip wood 6.7  Hydraulic oil is leaking 6.8  The tyres are wearing unevenly 14-00-003 v3.1...

  • Page 128: The Engine Doesn't Crank

    Redwood Global Ltd- ST8D Chapter 6: Troubleshooting Operator and Maintenance Manual 6.1   THE ENGINE DOESN'T CRANK Possible cause Check Corrective action Battery Check battery terminals Tighten if loose Check battery is charged Charge if flat Check red and black battery Tighten if loose cables at the engine connection...

  • Page 129: The Display Screen Is Blank

    Redwood Global Ltd - ST8D Chapter 6: Troubleshooting Operator and Maintenance Manual Possible cause Check Corrective action Check battery condition Replace if damaged Ignition switch is damaged Check plug and wiring Refit or repair Debris in chamber Check chamber for debris Remove any debris 6.3  ...
  • Page 130 Redwood Global Ltd- ST8D Chapter 6: Troubleshooting Operator and Maintenance Manual Possible cause Check Corrective action Flow control valve Check valve is free to rotate Set the dial to 5 E-stop button depressed Check E-stop button Reset E-stop button Faulty stop bar or hopper tray Check stop bar sensor Replace sensor if damaged or Check hopper tray sensor...

  • Page 131: The Woodchipper Suddenly Stops Running

    Redwood Global Ltd - ST8D Chapter 6: Troubleshooting Operator and Maintenance Manual 6.5   THE WOODCHIPPER SUDDENLY STOPS RUNNING Possible cause Check Corrective action Loss of oil pressure Check oil level Top up if required Check oil pressure switch Replace if damaged or faulty Overheated Check cooling fan and belt Replace if damaged...

  • Page 132: Hydraulic Oil Is Leaking

    Redwood Global Ltd- ST8D Chapter 6: Troubleshooting Operator and Maintenance Manual Possible cause Check Corrective action No stress occurring too soon Check main belts Tension correctly ► For more information, refer to "Adjusting the main belt tension" on page 111 Low RPM Check throttle Adjust as required...
  • Page 133 Redwood Global Ltd - ST8D Hydraulics schematic Operator and Maintenance Manual HYDRAULICS SCHEMATIC 14-00-003 v3.1...
  • Page 134 Redwood Global Ltd- ST8D FörstAssist Operator and Maintenance Manual FÖRSTASSIST The FörstAssist technical support team is there to back you up and give you assistance in the event of a mechanical issue or if you have a product-related technical question. service@forstglobal.com +44 (0) 1264 721792 14-00-003 v3.1...
  • Page 135 Redwood Global Ltd - ST8D Warranty Operator and Maintenance Manual WARRANTY WARRANTY STATEMENT  1. Redwood Global Ltd guarantee all Först equipment supplied by them against any defect in manufacture and assembly – this guarantee is for a period of 3 years commencing on the date of sale to the first end user.
  • Page 136 Redwood Global Ltd- ST8D Certification Operator and Maintenance Manual CERTIFICATION     CERTIFICATE & DECLARATION OF CONFORMITY FOR CE MARKING   Company contact details: Redwood Global Ltd,Unit 86, Livingstone Road, Walworth Business Park, Andover, SP10 5NS   Hereby declare that this declaration of conformity is issued under our sole responsibility and that the following objects of the declaration: ST6 (Petrol and Diesel) towed TR6 (Petrol and Diesel) on tracks...
  • Page 137 Redwood Global Ltd - ST8D Service record Operator and Maintenance Manual SERVICE RECORD Date Service Hours Agent stamp   Date Service Hours Agent stamp type type                              ...
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  • Page 139 Redwood Global Ltd - ST8D Index Operator and Maintenance Manual regeneration  92 DPF regeneration lamp and switch  95 INDEX DPF regeneration methods  94 Draining the hydraulic oil  116 During storage  64 About blade sharpening  106 Active Engine Codes  35 Emergency Stop buttons  28 Adjusting The Main Belt Tension  111 Engine compartment Overview  22 Aftertreatment...
  • Page 140 Redwood Global Ltd- ST8D Index Operator and Maintenance Manual Replacing the battery  118 Routine Cleaning  97 Left-hand and right-hand side  15 Routine maintenance  85 Running gear – hitch & axle  124 Machine Information  34 Machine lifting  60 Safe working  44 Manual regeneration mode (forced regeneration)  96 Safety & function test  73 Manufacturer’s Statutory Plate  40...
  • Page 141 Redwood Global Ltd - ST8D Index Operator and Maintenance Manual Warranty Claims  135 Warranty Statement  135 Weekly maintenance checks  89 14-00-003 v3.1...
  • Page 142   Redwood Global Ltd Unit 86, Livingstone Road, Walworth Business Park, Andover, SP10 5NS www.forstglobal.com sales@ForstGlobal.com Scan for www.forstglobal.com...

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