Husqvarna LiHD50 Instruction manual

Workshop Manual
English
LiHD50 / LiHD60X / LiHD70X

English – 3
Workshop Manual
Husqvarna LiHD50 / LiHD60X / LiHD70X
Table of contents
Husqvarna AB has a policy of continuous product development and therefore reserves the right to modify
the design and appearance of products without prior notice.
Contents
Index ........................................................................ 4
Introduction and safety regulations ................ 6
Technical data ..................................................... 10
Service tools LiHD60X / LiHD70X .................. 11
Service data LiHD50 .......................................... 12
Diagnosis and troubleshooting ...................... 16
Basic dismantle/assembly ............................... 22
Safety equipment ............................................... 26
Repair instructions - LiHD50 ........................... 34
Repair instructions LiHD60X / LiHD70X ....... 40

4 – English
Index
Index
D
Diagnosis and troubleshooting 16
Remove the battery 17
Connect the diagnostic tool 17
No signal to diagnostic tool 17
Troubleshooting Guide 18
Troubleshooting the main switch 19
Troubleshooting the keypad 19
Troubleshooting the control unit PMDC -
LiHD50 20
Troubleshooting the control unit BLDC - LiHD60
LiHD70 20
Overhaul 20
F
Troubleshooting 18
Troubleshooting guide 18
Troubleshooting the main switch 19
Troubleshooting the keypad 19
Troubleshooting the control unit PMDC -
LiHD50 20
Troubleshooting the control unit BLDC - LiHD60
LiHD70 20
G
Basic dismantling/assembly 22
Battery 23
Wear guard LiHD50 23
Front handle LiHD50 23
Chassis LiHD50 24
Front handle LiHD60X / LiHD70X 25
Chassis LiHD60X / LiHD70X 25
Threads 55
Repairing damaged threads 55
I
Introduction and safety regulations 7
General 7
Safety 7
Target group 7
Modications 7
Tool 7
Structure 7
Numbering 7
General Instructions 8
Special Instructions 8
Boundaries 8
Symbols on the machine 9
Symbols in the Workshop Manual 9
R
Repair instructions LiHD50 34
General repair instructions 35
Replacing the shears 35
Dismantling the motor and gear package 36
Assembling the motor and gear package 36
Dismantling the keypad and control unit 37
Assembling the keypad and control unit 37
Repairing damaged threads 38
Repair instructions LiHD60X / LiHD70X 40
General repair instructions 41
Dismantling the gear housing and motor out of
the chassis 41
Dismantling gears, cutting unit and motor out of
the gear housing 41
Cutting unit 42
Gears 44
Assembling gears, cutting unit and motor in the
gear housing 45
Dismantling the control unit and battery
contact 46
Assembling the control unit and battery
contact 46
Dismantling the rear handle 47
Dismantling the keypad 49
Assembling the keypad 50
Dismantling the main switch and main
cabling 51
Assembling the main switch and main
cabling 51
Assembling the rear handle 52
Assembling the gear housing and motor in the
chassis 54
Repairing damaged threads 55
S
Service data 12
Service tools 11
Safety equipment 27
Dismantling the front handle LiHD50 27
Dismantling the hand guard LiHD50 27
Assembling the hand guard LiHD50 27
Dismantling the throttle trigger LiHD50 28
Assembling the throttle trigger LiHD50 28
Dismantling the front handle and start inhibitor -
LiHD60X / LiHD70X 29
Assembling the front handle and start inhibitor -
LiHD60X / LiHD70X 30
Dismantling the throttle trigger and handle stop
LiHD60X / LiHD70X 32
Assembling the throttle trigger and handle stop
LiHD60X / LiHD70X 32
Replacing the blade guard - LiHD60X /
LiHD70X 33
T
Technical data 10

English – 5
Index

6 – English
Introduction and safety regulations
2 Introduction and safety regulations
Contents
2.1 General ............................................................................................................................................ 7
2.2 Safety .............................................................................................................................................. 7
2.3 Target group.................................................................................................................................... 7
2.4 Changes .......................................................................................................................................... 7
2.5 Tools ............................................................................................................................................... 7
2.6 Structure ......................................................................................................................................... 7
2.7 Numbering ...................................................................................................................................... 7
2.8 General instructions ........................................................................................................................ 8
2.9 Special instructions ......................................................................................................................... 8
2.10 Limitations ...................................................................................................................................... 8
2.11 Symbols on the machine ................................................................................................................. 9

English – 7
2 Introduction and safety regulations
Introduction and safety regulations
2.1 General
This Workshop Manual provides a comprehensive
description of how to trouble shoot, repair and test
the machine. A description of different safety steps
that must be taken during repair work is also given.
2.2 Safety
Note! The section dealing with safety must be
read and understood by all those carrying out
repair work or service on the machine.
Warning symbols can be found in this Workshop
Manual and on the machine. See ”Symbols on the
machine” and ”Symbols in the Workshop Manual”.
A new warning symbol decal must be applied as
soon as possible if a warning symbol on the ma-
chine has been damaged or is missing so that the
greatest level of safety can be maintained when
using the machine.
2.3 Target group
This Workshop Manual is written for personnel with
general knowledge about the repair and service of
Husqvarna machines.
The Workshop Manual must be read and under-
stood by personnel who will carry out repair work
and service on the machine. The Manual is also
suitable for use when training new employees.
2.4 Changes
Any modications to the machine will be gradu-
ally introduced into ongoing production. As these
modications affect service and/or spare parts,
specic service information will be sent out on
each occasion. This means that in time this Work-
shop Manual will become out of date. In order to
prevent this, the Manual should be read together
with all service information concerning the machine
in question.
2.5 Tools
Special tools are required for some stages. All
service tools are listed in the Workshop Manual.
Usage is made evident in each section.
Always use original Husqvarna:
• Spare parts
• Service tools
• Accessories
2.6 Structure
This Workshop Manual can be used in two differ-
ent ways:
• For the repair of a particular system on the ma-
chine.
•
Dismantling and assembly of the entire machine .
Repair of a particular system
When a particular system on the machine is to be
repaired, proceed as follows:
1. Look up the page for the system in question.
2. Carry out the following steps:
• Dismantling
• Cleaning and inspection
• Assembling
Dismantling and assembly of the entire machine
When taking apart the whole machine and assem-
bling it again, proceed as follows:
1. Open the chapter "Basic dismantle" and carry
out Dismantling in the order set out in the sec-
tions.
2. Open the chapter "Repair instructions " and
carry out Dismantling in the order set out in the
sections.
3. Carry out Cleaning and inspection in the order
set out in the sections.
4. Carry out Diagnostic troubleshooting if a fault
in the electrical system is suspected.
5. Order or collect all requisite spare parts from the
stores.
6. Carry out Assembly in the order set out in the
sections.
2.7 Numbering
Position references to components in the gures
are designated A, B, etc.
The gures are numbered 1, 2 etc.
The position references and gure numbers restart
in each new section.

8 – English
2.8 General instructions
The workshop where the machine is to be repaired
must be equipped with safety equipment in accor-
dance with local regulations.
No one may repair the machine without having
read and understood the contents of this Workshop
Manual.
This Workshop Manual contains the following
warning boxes in relevant places.
2.9 Special instructions
Remove the battery from the machine before dis-
mantling and troubleshooting.
The battery must not be connected while the ma-
chine is dismantled.
Never unscrew the battery. Replace a damaged
battery.
Use a brush/compressed air when cleaning the
machine.
Water, cleaning uid and petroleum products may
only used when cleaning the cutting unit.
When using compressed air, do not direct the air
jet toward your body. Air can penetrate into the
blood circulation, which means mortal danger.
Use ear protection during testing.
2.10 Limitations
This Workshop Manual is mainly intended for re-
pair work on LiHD60X and LiHD70X but in certain
cases also covers LiHD50.
WARNING!
The warning box warns of the risk
of personal injury if the instruc-
tions are not followed.
NOTE!
This box warns of material damage if
the instructions are not followed.
Introduction and safety regulations

English – 9
Introduction and safety regulations
2.11 Symbols on the machine
The machine keypad has the following symbols.
The symbols below are embedded on the machine.
2.12 Symbols in the Workshop Manual
This symbol warns of personal injury
when the instructions are not followed.
Starting/Stopping
savE / Battery saver mode
Warning lamp/Fault indicator
Adjustable handle

10 – English
3 Technical data
Technical data
LiHD50
LiHD60X
LiHD70X
Cutting speed
for savE
cuts/min
2700
3200
3200
Cutting speed
for normal operation
cuts/min
3200
4000
4000
Weight without battery
Ibs/kg
6.6 / 3.0
8.4 / 3.8
8.6 / 3.9
LiHD50
LiHD60X
LiHD70X

English – 11
Service tools
4 Service tools LiHD60X / LiHD70X
Battery Diagnostic Tool Engine Diagnostic Tool kit - AutoTune™
BATTERY
DIAGNOSTIC
INSTRUCTION
BATTERY
DIAGNOSTIC
INSTRUCTION
Pos Designation Used with Order No.
1 Diagnostic tool - Battery Diagnosis and troubleshooting 581 19 23-01
2 Diagnostic tool - AutoTune™ Diagnosis and troubleshooting 576 69 23-01
1 2
Battery Diagnostic Tool
The Battery Diagnostic Tool is a service tool for Husqvarna's battery powered products. It is
intended to be used with a computer (PC), which is not included.
The service tool transmits various data from the product and battery to the computer, such as
product ID. There is also a troubleshooting guide in the form of a diagnostic tool and a list of
saved error codes.
The software in battery powered products can also be updated with the Battery Diagnostic Tool.

12 – English
5 Service data LiHD50
Service data
Key
The numbers by bolted components represent the tightening torque in Nm.
Lubricate chain saw oil.
Lubricate with grease.
1 Nm
(x6) 2 ~ 3 Nm 4 mm

English – 13
Service data
Service data LiHD50
(x2) 1 Nm
(x8) 2 ~ 3 Nm 4 mm
(x2) 2 ~ 3 Nm 4 mm
(x11) 2 ~ 3 Nm 4 mm

14 – English
Service data
Service data LiHD60X / LiHD70X
LiHD60x US
(x6) 2 ~ 3 Nm 4 mm
(x2/x4(70X)) 2 ~ 3 Nm 4 mm
(x5/x7(60X US)) 2 ~ 3 Nm 4 mm
(x2) 2 ~ 3 Nm 4 mm
8 mm

English – 15
Service data
Service data LiHD60X / LiHD70X
(x4) 2 ~ 3 Nm 4 mm
(x10) 2 ~ 3 Nm 4 mm
(x8) 2 ~ 3 Nm 4 mm
(x4) 2 ~ 3 Nm 4 mm
(x2) 2 ~ 3 Nm 4 mm
(x5) 2 ~ 3 Nm 4 mm
(x2) 1 Nm
(x2) 1 Nm

16 – English
6 Diagnosis and troubleshooting
Diagnosis and troubleshooting
Contents
6.1 Remove the battery ....................................................................................................................... 17
6.2 Connect the diagnostic tool - LiHD60X / LiHD70X ........................................................................ 17
6.3 No signal to diagnostic tool .......................................................................................................... 17
6.4 Troubleshooting diagram - LiHD50 ............................................................................................... 18
6.5 Troubleshooting the main switch .................................................................................................. 19
6.6 Troubleshooting the keypad .......................................................................................................... 19
6.7 Troubleshooting the control unit PMDC - LiHD50 ......................................................................... 20
6.8 Troubleshooting the control unit PMDC - LiHD60X / LiHD70X ...................................................... 20
6.9 Overhaul ........................................................................................................................................ 20

English – 17
WARNING!
The battery must always be removed
for service/repair work and may only
be replaced once the machine has
been completely assembled again!
WARNING!
Do not short circuit the battery!
Never unscrew the battery!
Never fit a damaged battery!
Replace a damaged battery!
Diagnosis and troubleshooting
6 Diagnosis and troubleshooting
Fig 2
Fig 1
6.1 Remove the battery
Press in the catches and remove the battery.
See gure 1.
6.2 Connect the diagnostic tool -
LiHD60X / LiHD70X
1
Connect the adapter cable for the diagnostic tool to
the battery and the battery contact on the machine.
Connect cable (A) to the diagnostic tool for trouble-
shooting the machine.
Connect cable (B) to the diagnostic tool for trouble-
shooting the battery.
NB! Refer to the manual for the Diagnostic Tool
Battery for detailed instructions and follow the
instructions in the diagnostic tool.
See gure 2.
2
Diagnose/troubleshoot according to the diagnostic
tool instructions and make any necessary repairs
as instructed in the relevant chapter in this manual.
6.3 No signal to diagnostic tool
1
Check that the contact on the battery and the bat-
tery contact on the machine are intact and clean.
Replace the battery or alternatively the control
unit on the machine if there is any damage to the
contact.
2
Check that the cable to the diagnostic tool is intact
and clean. Replace the cable if it is damaged.
3
Restart the computer/Reinstall the software.
2
1
1
A B

18 – English
6.4 Troubleshooting diagram - LiHD50
The diagnostic tool cannot be used to troubleshoot
LiHD50. Therefore, troubleshoot the electrical sys-
tem as shown in the diagram below and in Chapter
6.5-6.8.
Diagnosis and troubleshooting
Product will not start
Check the battery
Can the product be started
– green light?
Is the keypad showing a
fault signal?
Let the machine cool
down for at least 60 mins.
Change the control unit if
the fault persists.
Check the fuse
Check the cables
Replace the partCheck the safety switch
Check the breaker
Check the electric motor Replace the control unit

English – 19
Fig 3
Fig 4
Fig 5
In addition to troubleshooting with the diagnostic
tool, a potentiometer can be used to troubleshoot
certain parts manually.
Replace damaged parts as described in the rel-
evant chapter.
6.5 Troubleshooting the main switch
The switch used in professional battery products
from Husqvarna has two functions, to supply cur-
rent to the control unit and the electric motor, and
act as a position sensor for the variable speed
control. All these functions can easily be tested and
veried using a resistance meter.
NB! The switch should not be depressed more than
6 mm and not to its end position when testing.
• Measure between B+ and B1 when the switch is
not depressed. The result should be open circuit.
• Measure between B+ and B1 when the switch is
depressed. The result should be closed circuit.
• Measure between pin 2 and pin 5 when the switch is
not depressed. The result should be closed circuit.
• Measure between pin 2 and pin 5 when the
switch is depressed. The result should be 50 kΩ
± 25%.
• Measure between B1 and Pin 1. The result
should always be closed circuit.
See gure 3.
If all readings are within specied limits, the switch
is OK.
6.6 Troubleshooting the keypad
It is only possible to troubleshoot the keys on the
keypad. Measure pin 1-10 on the FPC on top of
the contact.
See gure 4.
The measuring points are shown in the diagram on
the right.
(1) Switch 1: On/Off
(2) Switch 2: Save E
(3) Switch 3: Pivoting (option)
(4) Supply
(5) LED 1, Green: On/Off
(6) LED 2, Green: savE
(7) Supply
(8) LED 3, Red: Fault/optional chain brake
(9) LED 4, Green: Pivoting (option)
(10) Supply
1 2 3 4 5 6
M1
B-
B+
B-
M
1
2
3
4
5
6
7
8
9
10
SW 1
SW 2
SW 3
LED 1
LED 2
LED 3
LED 4
12345678910
Diagnosis and troubleshooting

20 – English
Diagnosis and troubleshooting
Fig 6
Fig 7
6.7 Troubleshooting the control unit
PMDC - LiHD50
Check that the blade terminals and associated
wires are not bent or damaged.
(A) 6.3x0.8mm M- (Black wire)
(B) 6.3x0.8mm M+ (Red wire)
(C) 6.3x0.8mm PCB + (Yellow wire)
(D) 6.3x0.8mm PCB 0V (Black wire)
(E) 4.8x0.8mm Shutdown (blue wire)
See gure 6.
6.8 Troubleshooting the control unit
PMDC - LiHD60X / LiHD70X
Check that the blade terminals and associated
wires are not bent or damaged.
(A and B) 2.8 mm blade terminal to hand guard,
power switch (black wires).
(C) Battery communication (red, black and blue
wires).
(D) Power supply (red wire).
Shares connector with 0V.
(E) OV supply (black wire).
Shares connector with POWER.
(F) Motor + supply (gray wire).
Shares connector with Motor (-).
(F) Motor - supply (black wire).
Shares connector with Motor (+).
See gure 7.
6.9 Overhaul
Inspect the component parts of the machine. Re-
place damaged parts as described in the relevant
chapter.
A
B
C
DE
A
C D E F G
B