Husqvarna AUTOMOWER 420 Technical Manual Download Page 75

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English - 75

5.20 Replacing the wheel motor

1. Dismantle the body, see

5.2.1 Dismantling

the body on page 59

2. Dismantle the chassis, see

5.2.2 Dismantling the chassis on page 59

3. Disconnect the cable for the wheel motor

from the main circuit board and disconnect

the cable from the cable brackets in the

lower chassis section.

4. Remove the hub cap using a slotted

screwdriver.

5. Loosen the nut and washer holding the

wheel in place and remove the wheel.

6. Remove the wheel motor by unscrewing

the 4 screws (Torx 20) in the wheel motor

bracket.

7. Inspect the seal (O-ring) to make sure it

is not damage. Replace the seal if it is

damaged.

8. Assemble a new wheel motor and tighten

the screws with the recommended

tightening torque, see

5.30 Screw fasteners

on page 82

Refit nut, washer and wheel. Tighten the nut

with the recommended tightening torque,

see

5.30 Screw fasteners on page 82

10.

Refit the hub cap.

11. Connect the wheel motor cable to the main

circuit board and attach the cables to the

cable brackets.

12. Reassemble the chassis, see

5.2.5 Assembling the chassis on page 61

and

5.27 Assembling the sealing strip on

page 79

. Reassemble the body, see

5.2.6 Assembling the body on page 62

5.21 Replacing the cutting height

adjustment motor

1. Dismantle the body, see

5.2.1 Dismantling

the body on page 59

2. Dismantle the chassis, see

5.2.2 Dismantling the chassis on page 59

3. Disconnect the cable for the cutting height

adjustment motor from the cutting height

circuit board.

5. REPAIR INSTRUCTIONS

Summary of Contents for AUTOMOWER 420

Page 1: ...HUSQVARNA AUTOMOWER 420 430X 450X TECHNICAL MANUAL ...

Page 2: ......

Page 3: ...ng the charging station 63 5 4 Assembling the charging station 63 5 5 Changing the top cover 450X 64 5 6 Replacing the charging strips 64 5 7 Replacing the battery 65 5 8 Replacing the MCB 65 5 9 Replacing the HMI board 66 5 10 Replacing the GPS board Automower Connect board 67 5 11 Replacing the keypad 68 5 12 Changing the ultrasound sensors 450X 69 5 13 Replacing the ultrasound board 450X 69 5 1...

Page 4: ... robotic lawnmower be modified without the expressed permission of the manufacturer Unauthorized modifications and or components can result in serious disruptions and the risk of personal injuries Only use original spare parts Husqvarna AB has a policy of continuous product development and therefore reserves the right to modify the design appearance and function of products without prior notice Mo...

Page 5: ...arging station boundary wire and guide wire 11 Contact strip 12 Parking button not Automower 420 13 Charging station 14 Rating plate 15 Display 16 Keypad 17 Cutting system 18 Chassis box with electronics battery and motors 19 Handle 20 Main switch 21 Blade disc 22 Skid plate 23 Power supply 24 Extra blades 25 Alarm decal 26 Low voltage cable 27 Operator s manual and QuickGuide 28 Screws for securi...

Page 6: ...ervice program repair instructions and troubleshooting To make it easier to follow the following structure is used Text written in italics is shown in the mower s display or in the menus in the Autocheck Experience service program Words that are written in bold represent the keys on the mower s keypad or a button in the Autocheck Experience service program Words written in UPPERCASE italics refer ...

Page 7: ...ades Three pivoted cutting knife blades Three pivoted cutting knife blades Blade motor speed 2 300 rpm 2 300 rpm 2 300 rpm Power consumption during mowing 30 W 20 30 W 20 35 W 20 Cutting height 2 6 cm 2 6 cm 2 6 cm Cutting width 85 24 cm 85 24 cm 85 24 cm Narrowest possible passage 85 60 cm 85 60 cm 85 60 cm Maximum incline of mowing area 45 45 45 Maximum incline of boundary wire 15 15 15 Maximum ...

Page 8: ...nd 6 00 00 of the HMI program 1 4 1 Ascertaining the program version 1 Set the main switch to position 1 2 When the start page is displayed Keep the 0 key pressed in for 2 seconds to go to Quick Check 3 Select Info and press OK 4 Select General and press OK 5 The main program version is indicated on the line that starts MAIN e g 7 02 00 The HMI program version is indicated on the line starting HMI...

Page 9: ...tic lawnmower than on a conven tional mower It is the principle of the cutting the grass instead of knocking it off that makes this difference The double edged blades together with the technol ogy that rotates the blade disc in both directions in crease the life of the blades In order to keep the blades sharp for as long as pos sible it is important to keep the lawn free from branch es small stone...

Page 10: ... hardly visible The robotic lawnmower always attempts to keep the blade disc at an even speed Different degrees of pow er are used for this depending on the length thickness of the grass Automower compares the instantane ous power with an average power value from the latest hours of mowing This means that when the robotic lawnmower enters an area where the lawn is longer thicker than before the in...

Page 11: ...gnal message F signal Remote signal from the charging station which is generated by a loop in the charging station plate The F signal is used so that the mower knows that it is in the vicinity of the charging station There may be reasons to reduce the range of the charging station in rare cases It may be necessary if for instance the charging station is placed close to a bush or wall which prevent...

Page 12: ...ly a break in the boundary wire Red flashing light No F signal Most likely interruption in the charging station s antenna plate Solid blue light Weak signal in the boundary wire A signal This may depend on the boundary wire being over 800 m in length or that the wire is damaged If the mower still works this is not a problem Solid red light fault in the circuit board in the charging station Suggest...

Page 13: ...l is affected by the size of the working area islands headlands passages and corners The signal can also be affected by magnetic objects in the ground or in nearby walls and buildings The signal is weakened in these areas Examples of magnetic objects are iron fences iron gird ers and reinforcement bars Grass areas laid on con crete roofs can therefore receive a weakened signal When the signal is r...

Page 14: ...f the guide signal also varies along the guide loop depending on the proximity to other parts of the guide loop and is affected by islands head lands passages and corners To reduce the risk of the mower losing contact with the wire in corners it is recommended to not lay the wire at 90 degree angles It is better to lay the wire in two 135 degree angles 1 10 Searching methods to find the charging s...

Page 15: ...ower will also start searching for the boundary wire If the mower then finds and follows the boundary wire it keeps going until it has found the charging station or crosses the guide wire If it crosses the guide wire the robotic lawnmower will follow it in stead to the charging station When the mower follows the boundary wire or a guide wire it travels a distance into the F field before the F and ...

Page 16: ...on the mower stops and charging begins 1 13 Battery The robotic lawnmower is equipped with a Li Ion bat tery Compared with a NiMH for example Li Ion has very good properties even at high ambient tempera tures The battery also has low self discharge i e it can remain unused for a longer period than for exam ple NiMH without being damaged Counted in number of charging cycles the service life is also...

Page 17: ...right inclination The value from the tilt sensor is used among other things to compensate the operation of the wheel motors when mowing on slopes 1 14 3 Lift sensors The lift sensors are the sensors that detect if the mower is being raised off the ground This is done with the help of the mechanical design and magnets in each of the 2 front collision columns If the lift signal is indicated the mowe...

Page 18: ... to exit the Quick Info function and go to the main menu 2 1 1 Operate with the cover open For a number of the display modes below for in stance Loop it may be necessary to make a note of the values while the mower is in operation To do this the mower cover must be open while it operates 1 Select one of the display modes shown in Quick Info 2 Start the mower by pressing the START button 3 Instead ...

Page 19: ...rovides information on each battery Voltage The battery s current voltage level About 20 5 V indicates a fully charged battery and about 17 V indicates a flat battery Chargings The accumulated number of charges since date of manufacture or the counter was reset Charge level Shows the charge remaining in the battery When the battery is fully charged the charge is approximately 4200 mAh 2600 mAh for...

Page 20: ...de shows the loop system s signal quality measured through the loop sensors in the mower The loop signals can only be interpreted if the value for Quality is 100 If the value is 99 or lower the loop system does not function correctly and thus none of the values displayed for the signals are correct The Info Sensors Status display mode shows Collision front and Collision rear One way of testing the...

Page 21: ...dule Status Description OK Connected PIN SIM PIN required PUK SIM PUK required An incorrect PIN code has been entered too many times The PUK code can not be entered in the mower menu but the SIM card must be inserted into a cell phone to be unlocked Locked The SIM card is locked An incorrect PUK code has been entered too many times The SIM card has been permanently locked and must be replaced Erro...

Page 22: ...ocked The SIM card is locked Automower Connect not active No SIM card RSSI status Signal strength of GPRS reception between 0 98 the higher the value the better the reception The value should be greater than 10 for a stable connection Operator status The operator to which the operator is connected e g Telenor GPS signal Strength of GPS reception In order to set the center position of the Geofence ...

Page 23: ...ssages Reset messages both fault and info messages are deleted from the history list The History Search times display mode shows Search times Lists the number of minutes it took the mower to find the charging station from the time the search began until the mower arrived at the charging station The times from the past 12 searches are displayed 2 1 4 Advanced In Advanced mode settings that do not n...

Page 24: ...if your dealer recommends it 1 Park the robotic lawnmower in the charging station 2 Select Guide calibration and press OK 3 The robotic lawnmower reverses out of the charging station and runs a calibration process over the guide wire after which it begins to mow In Calibrate Tilt sensor calibration mode the tilt sen sor calibration can be started To calibrate i e reset the tilt sensor Place the ro...

Page 25: ...n then identify the right PIN code Press BACK to exit the function 2 3 Tools menu In addition to the main menu selections described in the Operator s Manual there is one called Tools The Tools menu includes the possibility of testing a mower s components and information about different operating data To display the Tools menu 1 Go to the main menu 2 Press and hold down the 7 and 9 keys simultaneou...

Page 26: ...ion Headlights Installation Area 1 5 Advanced Chargers Exit angles Corridor width Reversing distance Drive past wire Boundary wire Lawn coverage Find charging station Overview of search method GPS Auto How How far How often Deactivate Test Reset More Guide Delay Deactivate Reset More Test left Test right Overview of Lawn Coverage Deactivate More Delay time Guide 1 Guide 2 Guide 3 Reset Test Guide ...

Page 27: ...ettings Calibrate Loop Tilt sensor calibration Calibrate cutting height Mow times Sounds GPS navigation Battery Demo Search times Cutting motor Display User interface Reset trip values Sensors Automower Connect Guide calibration Battery Capacity Charging station Motors Installation settings lock GPS navigation Wheel motor Override ultrasonic lock 2 SPECIAL MENU FUNCTIONS ...

Page 28: ... of the mower s different subsystems e g software battery motors and sensors The menu can be used in connection with e g troubleshooting The General Battery Loop Sensors and Automower Connect functions show the same information as in the Quick Info menu above The Info Motors Wheel menu shows for the right and left wheel motors Speed The wheel motor speed in cm s Current Nominal power consumption m...

Page 29: ...ing This means the time when the robotic lawnmower is running without mowing is also included in the running time The time stated here is the time stated on the start page Total mowing h Cutting time is defined as the accumulated time in hours that the blade motor has been working Tot search time h Search time is defined as the accumulated time in hours that the mower has been in search mode in ot...

Page 30: ...ch is defined as the time the blade motor has been in operation The list shown contains the times of the last 12 search occurrences measured in minutes Battery capacity This part menu contains information about the bat tery s capacity Checking the battery s capacity requires that the battery is completely flat For more information see 6 6 Battery test The 4 most recent battery tests are saved in B...

Page 31: ...de crease the wheel force and in this way run the mo tors forward or backward The following points should be checked when testing the wheel motors Increase the power to 80 and block each drive wheel in at least ten different positions along the wheel revolution Check that the motor starts again when the blocking is released Increase the power to 100 and check that the speed in each wheel is at lea...

Page 32: ...e blade disc rotates during the test of the blade motor Keep your hands and feet at a safe distance WARNING The following values are shown on the display Speed The speed is normally 2 300 rpm Current An indication value of how much power is needed to sustain 2 300 rpm When operating the blade motor with blade disc and blades fitted but without cutting grass the normal value is 350 mA 100 mA Voltag...

Page 33: ... is recommended to use Info Battery and Info Loop to carry out a more exact inspection of signal strength and charge current GPS navigation This function is used to check the GPS navigation not 420 Activated Yes No GPS navigation can be activated via Installation Lawn coverage GPS supported navigation Installed Yes No If NEJis shown make sure the GPS module 430X or Automower Connect module 450X is...

Page 34: ... on using the main switch Installation settings lock When the installation lock is activated it is not pos sible to change any settings in the Installation menu from the main menu This function must be deactivat ed to carry out any changes to the installation settings Override ultrasonic This function makes it possible to turn off the ultra sound When ultrasonic has been turned off from this menu ...

Page 35: ...e loop is defined as the guide wire from the charging station to the T connector in the boundary wire plus the boundary wire from the T connector to the charging station going left from the T connector Refer to 3 3 Guide wire on page 38 The charging station must be positioned on relatively level ground See the adjacent picture The battery is spared if charged in the lowest possible ambient tempera...

Page 36: ... completed by doing one of the following Connect a short temporary loop in a small area around the mower Temporarily disengage the mower s loop detection see 2 6 5 Special settings on page 34 3 2 1 Laying the boundary wire See also the Operator s Manual 3 4 Installation of boundary wire Pegging It is easier to readjust a pegged boundary wire as it does not lie so deep If you know where the loop is...

Page 37: ... demarcated by the boundary wire even though the function of the robotic lawnmower does not demand this It will then make operations quieter and significantly reduce wear on the robotic lawnmower Obstacles that can withstand a collision include large trees high kerbstones swing frames sandboxes walls thick bushes etc Couplers If the supplied boundary wire is not long enough to cover the entire wor...

Page 38: ...esults in the shortest possible guide loop The robotic lawnmower follows the guide wire on the same side of the wire to and from the charging station This means that the guide wire is to the right of the mower when the mower travels to the charging station while it is to the left of the mower when the mower travels away from the station In passages the guide wire must be placed so that the mower h...

Page 39: ...e can be tested separately 2 Position the mower at least 5 meters from the charging station and 3 meters from the guide wire or boundary wire depending on which is being tested Aim the mower towards the wire to be tested 3 Start the mower and check that it can follow the wire and dock with the charging station If problems arise in conjunction with Test of Find charging station see 6 2 2 Symptoms w...

Page 40: ...red position The distance is now shown in the display This value can now be saved in Area X How long 5 Place the mower in the charging station and activate Test Lawn coverage again to check that the distance indicated is correct and that the mower can operate in the area 3 5 Calibrate guide To determine the signal strength at various dis tances from the guide wire in the actual installa tion the r...

Page 41: ...ion should be disabled for all extra installa tions and only be used for the main installation 3 7 Even mowing results in complex working areas The robotic lawnmower is equipped with setting op tions to ensure consistent mowing results even in complex working areas Settings are made in Lawn coverage If these settings are not changed the area near the charging station will be cut more than areas fu...

Page 42: ...g disk continually being measured and compared with an average value If there is more resistance than the av erage value then the mower is allowed to work longer and vice versa It takes 24 hours of mowing before an average value can been attained The weather timer will not differentiate between any cutting times during this period The average value is reset if the mower has been shut down for more...

Page 43: ... the specified 45 slope can nor mally only be reached in very favorable conditions Do not expect the mower to operate regularly in a working area with such steep inclines 3 10 New loop signal The PIN code in the robotic lawnmower is simply an anti theft function to prevent unauthorized people from using the mower It does not affect the loop signal in any way which the PIN code in Husqvarna G2 mode...

Page 44: ...cuments applicable to the robotic lawnmower Autocheck EXP is intended for robotic lawnmowers from and including the 2003 model The program does not work on earlier models The robotic lawnmower is connected to the computer using a service cable There are 2 different cables USB cable with service connector of a standard USB type for Husqvarna G3 models e g Automower 420 430X and 450X USB cable with ...

Page 45: ... open it manually 3 Follow the instructions given on screen 4 When the installation has finished an Autocheck EXP menu will be created in the Start menu on your computer A shortcut is also automatically created on the computer s desktop 4 1 2 Log in to Autocheck EXP 1 Start the program by double clicking on the program icon on the desktop 2 Enter your username and password in the login box that no...

Page 46: ...text Connected mower None is displayed in the lower bar in Autocheck EXP contact with the mower has not been established If this is the case check the following Check that cable is correctly connected both in the computer and in the mower The mower is on i e main switch in position 1 and that the start page is visible Make sure that G3 is selected in the program s bottom left corner If you alterna...

Page 47: ...p texts and il lustrations in the program to guide the user The program s main functions are grouped in a number of menus that are accessed via buttons in a list in the upper part of the program Auto test Manual test Operating history Programming Log book Tools Documentation 4 AUTOCHECK EXPERIENCE SERVICE PROGRAM ...

Page 48: ...ice program Auto test is a suitable function to use for an overall review of the components for example in connection with winter ser vice or to start troubleshooting After a completed Auto test the results are presented in a list Non approved results are presented in red while tests that are skipped are presented in yellow Approved tests are indicated by green ticks 4 AUTOCHECK EXPERIENCE SERVICE...

Page 49: ...ta displays information about the mower s function divided into Key data Search times and Battery history Trip is also displayed under Operating data Essentially the same infor mation is saved here as under Key data but with the difference that the trip counter can be reset just as the number of kilometers can be reset in a car This function is ideal to use when you wish to see how the mower has b...

Page 50: ...l programming procedure does not succeed 1 Put the main switch in position 0 2 Connect the USB cable and start Autocheck EXP 3 Keep the 0 key depressed 4 Put the main switch in position 1 at the same time as keeping the 0 key depressed 5 The text Loading Language is shown in the display Now start Programming in Autocheck EXP Programming a blocked main circuit board If the main circuit board is loc...

Page 51: ...nnected to Autocheck EXP the serial number has to be entered manually It is very important to enter the correct serial number Service mode If the main circuit board is replaced when troubleshooting and you are not sure if it will be kept in the relevant robotic lawnmower it is possible to temporarily program the main circuit board in a so called Service Mode In Service Mode a serial number is not ...

Page 52: ...tional save to the log book is carried out when the mower is disconnected or when Autocheck EXP is turned off A maximum of 2 automatic saves are im plemented per date on an individual mower 4 3 6 Tools Under the Tools section you will find a number of important special settings Actions that can be un dertaken from this menu include Clear the mower s list of fault messages Restore the mower to fact...

Page 53: ...h models from 2003 and later Current service plans for many mower mod els are also here Documents marked in red are newly added and unopened documents On the right of the document tab is a preview of the first page of the selected document Autocheck EXP automatically searches for new documents when there is a connection to the Internet This means that users can directly access im portant informati...

Page 54: ...nectors or components on a circuit board To avoid electrostatic discharge in electronic components always earth yourself for example against a radiator before you start to work on electrical components Always disconnect cables from a component by pulling the connector Do not pull the actual cable Never use any form of silicone or the like when repairing a robotic lawnmower If possible test that co...

Page 55: ...mower s functions In simple terms this can be described as the main circuit board gathering sensor signals that are evalu ated by the software and generating control signals for the motors The HMI circuit board collects its in formation from keys that are pressed on the keypad and conveys the menu selections that the user has made to the main circuit board which saves them in its memory These sele...

Page 56: ...used to control the mower and keep the mower inside the working area The lift sensors and the collision sensors measure the magnetic field from the 2 permanent magnets that are located in the body If the magnetic field decreases the distance to the magnet increases the main circuit board interprets that the mower has been lifted or a collision has occurred The tilt sensor is an accelerometer posit...

Page 57: ... are marked with text in English that describes which cable is to be con nected There are a number of points on the chassis to which the cables can be attached with cable ties We recommend that these fixing points are used at all times It produces a safer installation and reinforces the intuitive feel for where the cable should be connected 5 1 6 Battery The robotic lawnmower is equipped with spec...

Page 58: ...ly have the same article number as spare parts The motors cannot be repaired but are replaced as a unit 5 1 9 Charging station Automower generation 3 is charged with DC power unlike the AC power on Automower G2 models This means that it is very important to always con nect the plus and minus cables correctly to the charging strips on the mower and the contact strips in the charging station 1 The F...

Page 59: ...mmet for the charging cable found at the very front under the mower 3 Pull out the rubber grommet on the charging cable and carefully loosen the connector 4 Loosen the body from the chassis by lifting the body one corner at a time while holding the chassis in place 5 2 2 Dismantling the chassis The chassis consists of upper and lower sections These are screwed together with 14 screws 1 Dismantle t...

Page 60: ...so as not to damage the cables connecting the chassis and display cover 5 Dismantle the HMI cable and the sensor cables from the HMI circuit board 5 2 4 Assembling the display cover When assembling Make sure parts are clean and that no cables will be pinched An unsealed chassis can let in moisture which can result in faults in the mower Always use new sealing strips before putting the chassis halv...

Page 61: ...cables will be pinched An unsealed chassis can let in moisture which can result in faults in the mower Always use new sealing strips before putting the chassis halves or the display cover together A sealing strip that has already been used does not provide a satisfactory seal IMPORTANT INFORMATION 1 Fit a new sealing strip to the lower section of the chassis Refer to 5 27 Assembling the sealing st...

Page 62: ...Mounting screws 5 Glue on a new guarantee seal It is possible to make notes for instance about dates or dealer signatures on the guarantee label Always fit the refitted chassis halves with a new guarantee seal The guarantee seal must be included and unbroken for the guarantee to be valid IMPORTANT INFORMATION 5 2 6 Assembling the body 1 Assemble the body on the chassis by pressing the body on top ...

Page 63: ... lift the charging cover forward and upward from the charging tower until the cover comes away from the tower 5 Disconnect the charging cable and the PARK cabling 430X 450X only from the circuit board 6 If the antenna plate must be disconnected from the charging tower the 4 screws Torx 20 underneath the charging station must be loosened 7 Disconnect the connector with the signal cables from the ma...

Page 64: ...ned or if there is oxide Also check the con tact strips in the charging station see 5 26 Replacing the contact strips charging station on page 79 1 Dismantle the body see 5 2 1 Dismantling the body on page 59 2 Remove the screw Torx 20 retaining the holder with the charging strips underneath the body 3 Dismantle the holder 4 Dismantle the charging strips with associated charging cable 5 Assemble t...

Page 65: ...P before replacing the main circuit board The operating data is then saved automatically 2 Dismantle the body see 5 2 1 Dismantling the body on page 59 3 Dismantle the chassis see 5 2 2 Dismantling the chassis on page 59 4 Disconnect all cables from the main circuit board Always pull the connector and NOT the cable Note the connector to which the cables are fitted so that the right cable is in the...

Page 66: ...fer to 4 3 4 Programming on page 49 For security reasons the serial number can only be entered once You should therefore ensure that the correct serial number is entered IMPORTANT INFORMATION 10 Test that the mower works When the main switch is set to position 1 after replacing a main circuit board a new start up sequence commences which includes entering a new PIN code 5 9 Replacing the HMI board...

Page 67: ...nnect the connection from the connector on the GPS circuit board Automower Connect board 5 Remove the circuit board 6 Fit the new board and connect the cable NB Assemble the board the right way round The connector should be facing the upper part of the chassis A SIM card must also be installed if it is an Automower Connect board NB Do not over tighten the screws This might damage the circuit board...

Page 68: ...ove the HMI board Only touch the edges of the circuit board Never touch the board s components and pin terminals IMPORTANT INFORMATION 7 Pull off the keypad and thread the cable out through the hole 8 Remove the protective film from the new keypad and then press new keypad onto the display cover Remember to thread the cable through the hole in the display cover Make sure to press the keypad carefu...

Page 69: ... Dismantle the chassis see 5 2 2 Dismantling the chassis on page 59 3 Loosen both cables connected to the ultrasonic board 4 Unscrew the 2 screws Torx 20 securing the ultrasonic board to the bottom of the chassis 5 Assemble the ultrasonic board screw it on and reconnect the cables 6 Refit the chassis and body 5 14 Replacing the headlight 450X 1 Dismantle the body see 5 2 1 Dismantling the body on ...

Page 70: ...h 1 Dismantle the body see 5 2 1 Dismantling the body on page 59 2 Dismantle the chassis see 5 2 2 Dismantling the chassis on page 59 3 Dismantle the MCB see 5 8 Replacing the MCB on page 65 4 Press the snap on fasteners together on the main switch and press the main switch out through the opening in the lower chassis section 5 Fit the new main switch together with the new gasket in the opening an...

Page 71: ...ifting it straight up still with the display cover closed 5 Clean the filter carefully with a clean and soft brush 6 If damaged the filter must be changed To change filter a Remove the damaged filter b Clean thoroughly around the mounting surfaces c Apply the new filter making sure the adhesive surfaces fasten securely on the chassis 7 Refit the bracket by pressing it straight down so the spring s...

Page 72: ...Fit the new front sensor circuit board and reconnect the cable 6 Refit the chassis and body 5 18 2 Rear loop sensors and tilt sensor The rear loop sensors and tilt sensor are part of the main circuit board The sensors cannot be replaced separately The whole MCB must be replaced as one unit see 5 8 Replacing the MCB on page 65 5 18 3 Lift sensors The magnet on the collision column must be fitted co...

Page 73: ...ion sensor circuit board 1 Dismantle the body see 5 2 1 Dismantling the body on page 59 2 Dismantle the chassis see 5 2 2 Dismantling the chassis on page 59 3 Disconnect the cable from the collision sensor circuit board Note Always pull the connector and NOT the cable 4 Remove the collision sensor circuit board by carefully bending up the snap on fasteners and lifting out the sensor circuit board ...

Page 74: ...hassis see 5 2 2 Dismantling the chassis on page 59 4 Loosen the connection for the blade motor from the main circuit board and disconnect the cable from the cable brackets in the lower chassis section 5 Dismantle the skid plate 4 Torx 20 screws the bearing 1 socket head 4 screw and the blade disc 3 Torx 20 screws 6 Unscrew the 4 screws Torx 20 securing the blade motor bracket to the chassis 7 Lif...

Page 75: ...w wheel motor and tighten the screws with the recommended tightening torque see 5 30 Screw fasteners on page 82 9 Refit nut washer and wheel Tighten the nut with the recommended tightening torque see 5 30 Screw fasteners on page 82 10 Refit the hub cap 11 Connect the wheel motor cable to the main circuit board and attach the cables to the cable brackets 12 Reassemble the chassis see 5 2 5 Assembli...

Page 76: ...ect the cable to the cutting height circuit board 12 Refit the chassis and body 13 Calibrate the cutting height adjustment See the Operator s Manual 5 22 Replacing the rear collision columns 1 Dismantle the body see 5 2 1 Dismantling the body on page 59 2 Unscrew the 4 screws Torx 20 securing the rear collision columns to the chassis 3 The collision column and its bracket can now be removed and re...

Page 77: ...uired By pulling out the split pin using pliers the collision column can be split to give access to the spring To replace the rubber diaphragm or the inner column the snap on fastener must be unscrewed To replace the sleeve for the lift sensor the lift sensor circuit board must also be removed by bending the snap on fastener The cable tie must also be removed NB Use a new cable tie when fitting th...

Page 78: ...r 6 Fit a new lock washer onto the axle NB Do not reuse the old washer as this will not give a satisfactory lock after being removed from the axle 7 Apply grease to the outer front wheel half before assembling 5 25 Replacing the circuit board charging station 1 Dismantle the cover from the charging station see 5 3 Dismantling the charging station on page 63 2 Loosen all contacts from the circuit b...

Page 79: ...e 63 2 Unscrew the 2 screws Torx 20 securing the cable lugs and contact strips 3 Replace the contact strips Also check that the cable lugs are undamaged and are not oxidized 4 Fit the contact strips the cable lugs and charging station cover NB Make sure that the contact strip can move freely and that it springs back 5 27 Assembling the sealing strip Alternative 1 Clockwise Start by laying one end ...

Page 80: ...ed the part must be replaced To ensure the threads in plastic parts are not damaged 1 Start by carefully turning the screw counter clockwise until it engages the existing threads in the plastic 2 The screw will fall slightly by itself when the threads are located correctly in relation to the existing threads in the plastic 3 Now screw in the screw to the correct torque as specified in 5 30 Screw f...

Page 81: ...king as the goods is thinner However it could be worth attempt ing if the plastic threads are worn as the alternative is to replace the entire chassis To mount a thread plug into a worn plastic thread 1 Make the hole bigger with a 6 6 mm drill to a depth corresponding with the plug 2 Screw in the thread plug with the screw that comes with the repair kit and screwdriver NB Tighten by hand so as not...

Page 82: ...x 14 mm Torx 20 1 4 Cover cutting height adjustment Screw gray 4 x 14 mm Torx 20 1 Service plug Screw 5 x 16 mm Torx 20 1 Blade motor unit Screw gray 4 x 14 mm Torx 20 2 Bracket lift sensor Screw gray 4 x 14 mm Torx 20 2 Front wheels Screw gray 4 x 14 mm Torx 20 1 2 Front collision column Screw 5 x 16 mm Torx 20 3 Chassis Screw 5 x 16 mm Torx 20 1 4 Rear collision column Screw 5 x 16 mm Torx 20 1 ...

Page 83: ...nt is carried out also perform the following actions 1 Update the main program and the HMI program to the latest version Many problems are solved immediately by the new software When the robotic lawnmower is connected to Autocheck EXP the Assistant notifies if a newer software version is available 2 Reset user settings in the mower by selecting Settings Reset user settings enter the PIN code and p...

Page 84: ...ard is faulty The battery on 320 m 2013 can be connected to port B instead of port A on the main circuit board A new main circuit board must be fitted on later model years or if the fault can not be rectified by changing port Refer to Replacing the MCB on page 65 Wrong type of battery Use only original batteries from Husqvarna Two batteries are connected on a 420 Only one battery can be used in th...

Page 85: ...ght speed refer to 5 1 7 Cutting mo tor on page 58 The main circuit board is de fective Change main circuit board refer to 5 8 Replacing the MCB on page 65 The cabling to the blade motor is damaged or faulty Check whether the damage is re pairable Otherwise replace the blade motor 40 42 46 Limited cutting height range 41 Unexpected cutting height adj 43 Cutting height problem drive 44 Cutting heig...

Page 86: ...hat the charging station LED indicates ECO mode Refer to 6 4 Troubleshooting the loop signal on page 95 Disturbances from metal ob jects fences reinforcement steel or buried cables close by Try moving the boundary wire and or creating additional islands in the work ing area 1 Outside working area The boundary wire connec tions to the charging station are crossed Check that the boundary wire is con...

Page 87: ...ated The guide wire is not laid at an angle on a slope If the guide wire is laid on a slope it must be laid at an angle across the slope See chapter 3 Installation in the Operator s Manual 10 Upside down The robotic lawnmower is lea ning too much or has turned over Turn the mower the right way up and rectify the cause of the mower turning over 50 51 52 Guide 1 2 3 not found The mower is no longer ...

Page 88: ...es Calibrate the tilt sensor Refer to 2 6 5 Special settings on page 34 Replace the main circuit board Refer to 5 8 Replacing the MCB on page 65 27 Settings restored User settings failed to save and the mower has been reset to factory settings If the fault occurs repeatedly program the mower with the most recent main program Refer to 4 3 4 Programming on page 49 If the fault occurs repeatedly even...

Page 89: ...equired 707 SIM card requires PIN The SIM card must be unlocked Make sure the correct SIM PIN has been entered into the mower s menu Network SIM card In case of persisting problems get in touch with your local dealer 708 SIM card locked The SIM card must be replaced Contact the local dealer 709 SIM card not found Automower Connect requires a SIM card to be inserted in the mower Contact your local ...

Page 90: ... may be poor and the robotic lawnmower has made a num ber of charging attempts Dock the robotic lawnmower in the charging station and check that the charging strips and contact strips make good contact 16 Stuck in charging sta tion There is an object in the way of the robotic lawnmower preventing it from leaving the charging station Remove the object The robotic lawnmower slides on the charging st...

Page 91: ...the blade disc or around the motor shaft Check that the blade disc rotates freely and easily If not the blade disc may need to be removed and grass and foreign objects removed The robotic lawnmower runs at the wrong time The robotic lawnmower clock needs to be set Set the clock See the Operator s Manual The start and stop times for mowing are incorrect Adjust the start and stop time setting for mo...

Page 92: ... motor if there is a fault The robotic lawnmower does not react when pressing the STOP button Faulty microswitch Check and replace if necessary the STOP button s microswitch The robotic lawnmower does not react when the cover is closed See above See above 6 2 2 Symptoms when searching Table 6 Symptoms during searching Symptom Cause Action The robotic lawnmower runs but the blade disc does not rota...

Page 93: ...ted Ensure the correct cable is connected to the right charging strip Remember that plus and minus must be correctly connected Refer to 5 6 Replacing the charging strips on page 64 The cables for the contact strips in the charging station are not connected or are connected incorrectly Make sure the cable lugs for the contact strips are intact and properly connected Ensure the correct cable is conn...

Page 94: ...r paste Also check that the cabling in the charging station and to the mower s charging strip is correctly connected and that they are not damaged Power supply faulty Check that the mower is receiving the charging power Check that the value for Current agrees with the guide values in section 1 13 Battery on page 16 6 2 5 Miscellaneous symptoms Table 9 Miscellaneous symptoms Symptom Cause Action Th...

Page 95: ...low the instructions below 6 4 1 Solid green light The LED in the charging station is solid green but nei ther the front or rear loop sensor detects any loop signal 1 Generate new loop signal see 3 10 New loop signal on page 43 The connection between the charging station and the mower is restored Test run the mower and continue with step 2 if the mower still cannot find the loop signal for the loo...

Page 96: ...oo long If the boundary loop is longer than 800 meters the strength can start to drop even if it is still sufficient 6 4 5 Red flash Probably an interruption in the F or N loop in the charging station s antenna plate Remove the charging station s cover and discon nect the connector from the circuit board Measure the resistance crosswise between the 4 pins in the cabling s connector that has white ...

Page 97: ...tance of the loop where the break may have occurred until there is only a very short section of the wire left 1 Check that the LED in the charging station flashes blue which indicates a break in the boundary wire See 6 4 Troubleshooting the loop signal on page 95 for more information on charging station LEDs 2 Check that the boundary wire connections to the charging station are properly connected ...

Page 98: ...er the LED has turned green Continue until only a very short section of the wire remains which is the difference between a flashing blue light and a solid green light 6 When the break is found the damaged section must be replaced with a new wire The damaged section can be cut out if it is possible to shorten the boundary wire Use only original couplers from Husqvarna 6 6 Battery test If the mower ...

Page 99: ...al capacity of about 3 200 mAh but is charged to a maximum of 2 600 mAh The test results from a battery test on a new battery are thus normally around 2 500 to 2 600 mAh As the battery ages the battery capacity decreases If the battery capacity displayed is approximately 1500 mAh or lower it is possible that the battery is dead and needs to be replaced Note that the values are approximate and vary...

Page 100: ...tween the blade disc and the blades Disas semble the blade disc to enable more thorough cleaning Run the blade motor using the Tools Test Motors Blade motor test function Listen for abnormal sounds when the blade motor is run ning Also test with various cutting height settings 7 2 Winter storage Before the robotic lawnmower is put away for the winter the following should be done Clean the entire m...

Page 101: ... chassis Refer to 5 2 1 Dismantling the body 2 X Clean the ultrasound sensors headlights care fully Clean thoroughly around any accessories if fitted on the body 430X 3 X Check the cable and con nector to the body s char ging strip 4 X Inspect ventilation filter and clean carefully with a soft brush Refer to 5 17 Cleaning or replacing the ventilation filter 5 X Change ventilation filter Refer to 5...

Page 102: ...aces on both mower and charging station charging plates with a fine grade emery cloth 18 X Carry out an Auto test of all components in Auto check EXP Refer to 4 3 1 Auto test 19 X Check that docking and charging work correctly Refer to 3 4 1 Test find the charging station 20 X Check the condition of the battery by carrying out a battery test Refer to 6 6 Battery test 21 X Fully charge the battery ...

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