VOLVO L70D WHEEL LOADER SERVICE REPAIR MANUAL PDF – 680 PAGES

Workshop Repair, Troubleshooting and Technical Service Information

The Volvo L70D Wheel Loader Service Repair Manual is a 680-page technical publication intended to support maintenance, troubleshooting, component inspection, system adjustments, and repair work on the Volvo L70D wheel loader.

With documentation information updated in 2022, this PDF manual brings together mechanical service procedures, electrical system descriptions, transmission information, hydraulic circuit diagrams, and technical specifications.

Its coverage extends from routine maintenance operations, such as engine oil changes and axle servicing, to more specialized procedures involving injection timing, transmission pressure testing, brake repairs, hydraulic steering adjustments, and Boom Suspension System checks.

The publication includes important information on the APS II Automatic Power Shift system, Comfort Drive Control (CDC), BSS400 Boom Suspension System, electronic monitoring functions, and working hydraulic circuits.

Unlike a basic operator's handbook, this manual focuses on the technical details used during workshop servicing, including component removal and installation, inspection procedures, adjustment instructions, circuit diagrams, and reference specifications.

PRODUCT INFORMATION

• Manufacturer: Volvo Construction Equipment
• Equipment: Volvo L70D Wheel Loader
• Manual Type: Service Repair / Workshop Manual
• Format: PDF
• Total Pages: 680
• Documentation Updated: 2022
• Delivery: Digital Download

WHAT DOES THIS VOLVO L70D MANUAL COVER?

The manual is organized into descriptions, electrical and hydraulic diagrams, equipment installation instructions, repair procedures, and technical specifications.

The following overview highlights the systems and service operations included in the documentation.

1. GENERAL MACHINE INFORMATION AND ROUTINE MAINTENANCE

The opening sections provide essential machine identification, service, and maintenance references.

General information includes:

• Product identification plates
• Machine transportation
• General machine descriptions
• Service intervals
• Recommended lubricants
• Engine oil and filter changes
• Axle oil changes
• Hydraulic system oil changes
• Hydraulic system cleanliness
• Hydraulic repair precautions
• Electric welding precautions
• Booster battery starting
• Towing procedures

These references are useful when planning regular maintenance or preparing the machine for workshop operations.

2. ENGINE SYSTEM AND MECHANICAL SERVICE

The engine section provides information about engine operation, air intake, cooling, and selected mechanical repair procedures.

ENGINE SYSTEM DESCRIPTION

• Engine general description
• Air cleaner
• Turbocharger
• Hydraulically driven cooling fan
• Engine compression testing

ENGINE SERVICE AND REPAIR

• Engine removal
• Engine installation
• Front crankshaft seal replacement
• Fuel system bleeding
• Engine idle speed checking and adjustment
• Injection angle checking and adjustment
• Stop solenoid setting
• Valve adjustment

The injection angle and idle speed procedures are particularly relevant for engine servicing and performance checks.

3. ENGINE COOLING FAN AND HYDRAULIC CONTROLS

The documentation includes procedures for checking the hydraulically driven cooling fan.

Covered operations:

• Cooling fan operating description
• Cooling fan motor removal
• Cooling fan motor installation
• Cooling fan hydraulic pressure checks
• Maximum cooling fan pressure adjustment
• Cooling fan speed checking and adjustment
• Radiator fan adjustment functions

4. ELECTRICAL SYSTEM AND MACHINE MONITORING

The electrical section explains the machine's control functions, instrumentation, and electronic monitoring equipment.

ELECTRICAL COMPONENTS

• Battery
• Alternator
• Starter motor
• Electrical distribution box
• Electrical connections
• Chassis connections
• Electrical component identification
• Electrical symbols and designations
• Warning lamps
• Instrument panels

ELECTRONIC CONTROL

• Vehicle Control Unit (V-ECU)
• Instrument Control Unit (I-ECU)
• Electronic control system
• Communication with data buses
• Software functions
• Control unit functions
• Electrical input and output signals
• Computer communication faults

5. INFORMATION DISPLAY AND WARNING FUNCTIONS

The Volvo L70D manual includes information about the display panel, operating messages, and service display functions.

ENGINE MONITORING

• Engine oil pressure
• Engine coolant temperature
• Fuel level
• Engine power reduction
• Engine shutdown
• Engine speed
• Air filter pressure

TRANSMISSION MONITORING

• Transmission oil pressure
• Transmission oil temperature
• Transmission oil filter
• Transmission overspeed
• Transmission disengagement
• Gear selector control
• Gearshifting solenoids

HYDRAULIC AND BRAKE MONITORING

• Hydraulic oil level
• Hydraulic oil temperature
• Brake pressure
• Brake pressure charging
• Brake testing
• Parking brake
• Boom Suspension System
• Central lubrication
• Differential lock
• Secondary steering

DISPLAY AND SERVICE FUNCTIONS

• Initial display
• Operating display
• Information display settings
• Service display unit
• Electrical control input signals
• Electrical control output signals
• Battery voltage display
• Service interval information
• Limp-home operation

6. APS II AUTOMATIC POWER SHIFT AND TRANSMISSION

The power transmission section includes descriptions and service procedures for the drivetrain.

TRANSMISSION OPERATION

• APS II Automatic Power Shift
• Transmission control functions
• Gear selector control
• Gearshifting solenoids
• Transmission neutral-position diagrams
• Planetary hub gears
• Differential carrier assembly

TRANSMISSION REPAIR AND INSPECTION

• Transmission removal
• Transmission installation
• Transmission oil pressure testing
• Differential lock adjustment
• Front axle removal and installation
• Rear axle suspension removal and installation
• Transmission troubleshooting tips

7. DRIVE AXLES AND FRAME COMPONENTS

The manual provides procedures for selected axle and structural components.

Included topics:

• Front axle removal
• Front axle installation
• Rear axle suspension removal
• Rear axle suspension installation
• Rear axle suspension play measurement
• Frame joint bearing replacement
• Differential lock adjustment

8. BRAKE SYSTEM REPAIR AND ADJUSTMENT

The braking section contains procedures for inspecting, testing, and repairing brake components.

BRAKE SYSTEM DESCRIPTION

• Brake system operation
• Foot brake valve
• Parking brake
• Parking brake electrical controls
• Brake hydraulic circuit

BRAKE SERVICE PROCEDURES

• Brake accumulator inspection
• Front brake disc wear checks
• Front brake disc replacement
• Rear brake disc wear checks
• Rear brake disc replacement
• Brake pedal angle adjustment
• Brake system bleeding
• Brake system functional checks
• Brake retardation testing
• Foot brake valve reconditioning
• Parking brake adjustment
• Brake circuit pressure testing and adjustment

9. STEERING AND COMFORT DRIVE CONTROL

The steering section covers hydraulic steering components and lever steering functions.

STEERING SYSTEM

• Steering system description
• Steering valve
• Hydraulic steering pump
• Steering cylinder
• Secondary steering

COMFORT DRIVE CONTROL (CDC)

• CDC general description
• CDC hydraulic system
• CDC electrical functions
• CDC lever steering
• Control lever SE603 voltage checks
• Lever steering speed adjustment
• CDC control valve checking and adjustment

STEERING SERVICE

• Steering pressure testing
• Steering holding pressure adjustment
• Steering valve reconditioning
• Steering cylinder reconditioning

10. OPERATOR CAB AND AIR CONDITIONING

The manual contains information about cab systems and climate control equipment.

CAB AND CLIMATE SYSTEMS

• Cab suspension
• Air conditioning system
• Heating, ventilation, and air conditioning unit
• Air conditioning electrical functions
• Air conditioning operating reliability

CAB SERVICE

• Cab removal
• Cab installation
• Air conditioning performance testing
• Evaporator cleaning

11. WORKING HYDRAULIC SYSTEM

The hydraulic section includes descriptions and diagrams for the working hydraulic equipment.

HYDRAULIC COMPONENTS AND FUNCTIONS

• Working hydraulic circuits
• Hydraulic control valve
• Hydraulic pressure control
• Hydraulic servo system
• Loader unit designations
• Heavy-duty hydraulic configurations

HYDRAULIC SERVICE PROCEDURES

• Hydraulic working pressure testing
• Hydraulic pressure adjustment
• Standby pressure testing and adjustment
• Servo pressure testing
• Servo pressure checks at the control valve spool
• Lift function shock valve checks
• Tilt function shock valve checks
• Third and fourth hydraulic function shock valve checks

12. BOOM SUSPENSION SYSTEM BSS400

A distinctive part of the Volvo L70D documentation is its coverage of the BSS400 Boom Suspension System.

Included topics:

• BSS400 system descriptions
• Boom suspension hydraulic diagrams
• Boom Suspension System functional checks
• Hydraulic accumulator pressure procedures
• Accumulator precharge pressure
• Pressure-reducing valve checks

13. THIRD, FOURTH, FIFTH AND SIXTH HYDRAULIC FUNCTIONS

The manual includes information about auxiliary hydraulic functions and associated diagrams.

Included topics:

• Third hydraulic function
• Fourth hydraulic function
• Third hydraulic function retaining control
• Third and fourth hydraulic function installation
• Third and fourth function shock valve checks
• Fifth and sixth hydraulic function circuit diagram

14. ELECTRICAL WIRING DIAGRAMS

The manual contains a collection of electrical wiring diagrams and circuit references.

WIRING DIAGRAM GROUPS

• Wiring diagrams 1–12
• Wiring diagrams 14–21
• Wiring diagrams 21B and 21C
• Wiring diagrams 23–26
• Wiring diagram 32
• Wiring diagrams 110, 130, 140, 150, 160, 170, 175, 180 and 190

The wiring diagrams include references for working hydraulics and auxiliary hydraulic controls.

15. HYDRAULIC CIRCUIT DIAGRAMS

The hydraulic diagram collection covers multiple machine systems and configurations.

Included diagrams:

• Transmission neutral-position block diagram
• Transmission neutral-position symbol diagram
• Brake hydraulic circuit
• Steering hydraulic circuit
• Steering with CDC and secondary steering
• Boom Suspension System
• Hydraulic control valve
• Heavy-duty hydraulics
• Working hydraulics
• Tilt hydraulic circuit
• Fifth and sixth hydraulic functions

16. OPTIONAL EQUIPMENT INSTALLATION

The manual contains installation instructions for selected additional equipment.

ELECTRICAL AND CAB ACCESSORIES

• Additional work lights
• Front working lights
• Rear working lights
• Rotating warning beacon
• Electrically heated rear-view mirrors
• Radio installation kit
• Sun blind
• Tail lamp guard
• Instructor seat

HYDRAULIC AND MACHINE EQUIPMENT

• Comfort Drive Control
• Third hydraulic function
• Fourth hydraulic function
• Third hydraulic function retaining control
• Hydraulic attachment locking
• Single-lever control

ADDITIONAL EQUIPMENT

• CareTrack
• Engine heater
• Toolbox
• Fender widener
• Rebuild kit

17. TECHNICAL SPECIFICATIONS AND SERVICE DATA

The specifications section provides reference information for machine maintenance and repairs.

GENERAL SPECIFICATIONS

• Machine dimensions
• Approximate weights
• Capacities in litres
• Standard tightening torques

ENGINE SPECIFICATIONS

• Engine technical specifications
• Fuel feed pump specifications
• Injection pump specifications
• Injector specifications
• Valve mechanism specifications
• Air cleaner specifications
• Engine component weights

ELECTRICAL SPECIFICATIONS

• Alternator specifications
• Battery specifications
• Electrical system specifications
• Starter motor specifications
• Lighting specifications
• Starting system information
• Preheating system information

TRANSMISSION AND DRIVELINE

• Power transmission specifications
• Front and rear axle information
• Differential components
• Transmission-related service references

BRAKE AND STEERING

• Brake system specifications
• Steering system specifications
• Steering tightening torques

HYDRAULIC SYSTEM

• Hydraulic system specifications
• Hydraulic pressure references
• Working hydraulic service data

COMMON WORKSHOP APPLICATIONS

This manual can support technical operations such as:

• Adjusting engine injection timing
• Checking engine compression
• Testing the hydraulic cooling fan
• Investigating transmission pressure problems
• Adjusting the differential lock
• Checking front and rear brake disc wear
• Bleeding the braking system
• Inspecting brake accumulator pressure
• Adjusting CDC lever steering
• Reconditioning steering components
• Checking hydraulic standby and working pressures
• Testing BSS400 operation
• Consulting electrical wiring diagrams
• Identifying hydraulic circuit connections

WHO CAN BENEFIT FROM THIS MANUAL?

The publication is intended for:

• Professional construction equipment mechanics
• Volvo wheel loader service technicians
• Independent heavy equipment repair workshops
• Fleet maintenance teams
• Machinery maintenance contractors
• Experienced Volvo L70D owners performing service work

IMPORTANT COMPATIBILITY INFORMATION

This manual is identified for the Volvo L70D Wheel Loader.

Some wiring diagrams, hydraulic circuits, and installation instructions relate to particular equipment configurations or optional systems.

Before purchasing, verify the machine model, serial number, and installed equipment to determine whether the relevant documentation applies to your machine.

The 2022 information update refers to the documentation and does not necessarily represent the wheel loader's manufacturing year.

DIGITAL PDF DELIVERY

This product is supplied as a digital PDF workshop manual.

The publication includes:

• 680 pages of technical information
• Routine maintenance procedures
• Engine service and adjustment instructions
• Electronic monitoring system descriptions
• APS II transmission information
• Axle and differential service procedures
• Brake system repairs
• CDC steering documentation
• Cab and air conditioning information
• Working hydraulic system service
• BSS400 Boom Suspension System information
• Electrical wiring diagrams
• Hydraulic circuit diagrams
• Optional equipment installation instructions
• Technical specifications and tightening torque references

Digital product only. No printed book will be shipped.

A compatible PDF reader is required to access the manual.

IMPORTANT DOWNLOAD INFORMATION: Due to the large file size, this manual is delivered via a Dropbox download link to ensure a smooth downloading experience without overloading our website. No software installation, Dropbox account, or login is required to access and download your manual. Simply open the provided link and download the file directly to your device. If you experience any issues accessing or downloading your manual, please don't hesitate to contact us. We're always happy to help and will assist you as quickly as possible!

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Detailed contents: 

Descriptions
(0) GENERAL
Description
Product identification plates
Section 8 Cab, interior fittings and machine superstructure
Transporting the machine
(1) STANDARD PARTS, SERVICE
Axles, oil change
Cleanliness in hydraulic systems
Electric welding
Engine, changing oil and filter
Hydraulic system, oil change
Recommended lubricants
Repairing hydraulic system
Service interval
Starting with booster batteries
Towing
(2) ENGINE WITH MOUNTING AND EQUIPMENT
Air cleaner, description
Compression test
Description
Hydraulically driven cooling fan, description
Turbocharger, description
(3) ELEC. SYSTEM; WARNING SYSTEM; INFORMATION SYSTEM; INSTRUMENTS
Air filter pressure
APS II
Back-up alarm
Battery, charging
Battery, description
Boom Suspension System (BSS)
Brake pressure charging
Brake pressure
Brake test
Central lubrication
Chassis connections
Communication with data buses
Control units, software functions
Coolant temperature, engine
Coolant temperature, outlet, radiator
Description of software functions table
Differential lock
Display panel and keypad, general
Display panel, information displays
Display panel, initial display
Display panel, operating display
Display panel, settings
Downshift audible signal (beep)
Electrical components
Electrical distribution box, description
Electrical symbols and designations
Electrical system, description
Electrical system, instructions for working on
Electronic control system, description
Engine oil pressure
Engine power reduction
Engine Shut Down
Engine speed for V-ECU
Explanations of cable and component markings
Explanations of communication cables
Fuel level
Gear selector control
Gearshifting solenoids
Hydraulic oil level
Hydraulic oil temperature
Information display unit, general
Instrument control unit I-ECU, functional description
Instruments
Interruption in computer communication
Interval wiper
Limp-Home, by-passed V-ECU
Middle instrument panel with warning lamps
Output brake pressure
Overspeed transmission
Parking brake, mechanical
Parking brake
Positive feed
Preheating of induction air
Radiator fan adjustment
Reduced computer communication
Secondary steering
Service display unit, brakes
Service display unit, electrical control input signals 1
Service display unit, electrical control input signals 2
Service display unit, electrical control input signals 3
Service display unit, electrical control output signals 1
Service display unit, electrical control output signals 2
Service display unit, electrical feed sensor
Service display unit, electrical system battery voltage
Service display unit, engine
Service display unit, general
Service display unit, hydraulics
Service display unit, settings
Service display unit, transmission
Service interval
Signal earth
Starter inhibitor
Starter motor engagement
System voltage
Transmission disengagement
Transmission oil filter
Transmission oil pressure
Transmission oil temperature
Travel speed
Tyre radius
Vehicle control unit V-ECU, functional description
Wiping during and after washing
(4) POWER TRANSMISSION
Planetary gear, hub
Differential carrier assembly
Description
APS II
(5) BRAKE
Description 2
Description
Foot brake valve, functional description
Functional description
Parking brake, electrical system, description
(6) STEERING
Lever steering (CDC), hydraulic system, description
Lever steering (CDC), general description
Lever steering (CDC), electrical functions
Secondary steering, description
Steering valve, reconditioning
Steering valve, description
Steering pressure and holding pressure, checking and adjusting
Steering cylinder, reconditioning
Steering cylinder, cutaway view
Hydraulic pump, description
Description
(7) FRAME; SPRINGS; DAMPING; AXLE SUSPENSION; WHEEL, TRACK UNIT
(8) MACHINERY HOUSE; CAB; EXTERIOR TRIM PARTS ANYWHERE
AC operational reliability, functional description
Air conditioning specifications
Air conditioning, description
Cab suspension, description
Electrical system, functional description
Heating, ventilation and air conditioning unit, description
(9) HYDRAULIC SYSTEM, DIGGING, HANDLING, GRADING EQUIPM, MISC. EQUIP
Designations of loader unit
Boom Suspension System (BSS400) 3
Boom Suspension System (BSS400) 2
Boom Suspension System (BSS400)
Diagrams
(3) ELEC. SYSTEM; WARNING SYSTEM; INFORMATION SYSTEM; INSTRUMENTS
Circuit list
Wiring diagram 1.
Wiring diagram 2.
Wiring diagram 3.
Wiring diagram 4.
Wiring diagram 5.
Wiring diagram 6.
Wiring diagram 7.
Wiring diagram 8.
Wiring diagram 9.
Wiring diagram 10.
Wiring diagram 11.
Wiring diagram 12.
Wiring diagram 14.
Wiring diagram 15.
Wiring diagram 15B.
Wiring diagram 16.
Wiring diagram 17.
Wiring diagram 18.
Wiring diagram 19.
Wiring diagram 20.
Wiring diagram 21.
Wiring diagram 21B.
Wiring diagram 21C. Working hydraulics
Wiring diagram 23.
Wiring diagram 24.
Wiring diagram 25.
Wiring diagram 26.
Wiring diagram 32.
Wiring diagram 110.
Wiring diagram 130.
Wiring diagram 140.
Wiring diagram 150.
Wiring diagram 160.
Wiring diagram 170.
Wiring diagram 175.
Wiring diagram 180.
Wiring diagram 190.
(4) POWER TRANSMISSION
Block diagram Neutral position, Transmission
Symbol diagram Neutral position, Transmission
(5) BRAKE
Hydraulic diagram, brake system
(6) STEERING
Hydraulic diagram, steering, incl. CDC and secondary steering 2
Hydraulic diagram, steering, incl. CDC and secondary steering
Hydraulic diagram, steering
(9) HYDRAULIC SYSTEM;DIGGING HANDLING GRADING EQUIPM.; MISC. EQUIP
Hydraulic diagram, 5th and 6th functions,
Hydraulic diagram, boom suspension system,
Hydraulic diagram, control valve
Hydraulic diagram, HD hydraulics
Hydraulic diagram, working hydraulics, tilt,
Hydraulic diagram, working hydraulics,
Wiring diagram 21. Working hydraulics
Wiring diagram 140. Detent 3rd hydraulic function
Wiring diagram 150. 3rd hydraulic function
Instllation Instructions
Extra workelihgts
Working light, front
Working light, rear
Tool box
sun blind
Rotating warning beacon
Rebuild kit
Electrically heated rear-view mirrors
Radio installation kit
Tail lamp guard
Single lever control
3rd hydraulic function retaining function
Seat for the instructor
Installlation kit for Air
Fender widener
Engine heater (120 V, 1500 W)
Electrical engine heater 2
Electrical engine heater
Comfort drive control (CDC)
Care Track
Attachment lock
3rd 4th hydraulic function
Repair
(0) GENERAL
Time Guide
(2) ENGINE WITH MOUNTING AND EQUIPMENT
Crankshaft seal front, change
Engine, installing
Engine, removing
Fan motor, installing
Fan motor, removing
Fuel system, bleeding
Hydraulically driven cooling fan, checking and adjusting max. pressure
Hydraulically driven cooling fan, checking and adjusting speed
Idle speed, checking and adjusting
Injection angle, checking and adjusting
Stop solenoid, setting
Valves, adjusting
(4) POWER TRANSMISSION
Differential lock, adjusting
Front axle, installing
Front axle, removing
Rear axle suspension, installing
Rear axle suspension, removing
Transmission oil pressure, checking (all)
Transmission, installing
Transmission, removing
Troubleshooting tips
(5) BRAKE
Accumulator, checking (removed)
Brake discs, front wheel brakes, changing
Brake discs, front wheel brakes, checking wear
Brake discs, rear wheel brakes, changing
Brake discs, rear wheel brakes, checking wear
Brake pedal, adjusting angle
Brake system, bleeding
Checking function
Discarded accumulators
Foot brake valve removed, reconditioning
Parking brake, adjusting
Pressure in circuit, checking and adjusting
Retardation, functionality test
(6) STEERING
Control lever SE603, checking input output voltage
Lever steering, adjusting steering speed
Lever steering, checking and adjusting control valve
(7) FRAME;SPRINGS;DAMPING;AXLE SUSPENSION; WHEEL TRACK UNIT
Frame joint, changing bearings
Rear axle suspension, checking play
(8) MACHINERY HOUSE;CAB;EXTERIOR TRIM PARTS ANYWHERE
Air conditioning, checking performance
Cab, installing
Cab, removing
Evaporator, cleaning
(9) HYDRAULIC SYSTEM;DIGGING HANDLING GRADING EQUIPM.; MISC. EQUIP
Boom Suspension System (BSS400), checking function
Hold (stand-by) pressure, checking and adjusting
Hydraulic oil pressure in accumulators,
Precharging pressure in accumulators,
Pressure reducing valve (CT8) for
Servo pressure, checking and adjusting
Servo pressure, checking by spool in control valve
Shock valve, lift function, checking and adjusting
Shock valve, tilt function, checking and adjusting
Shock valves 3rd and 4th functions,
Working pressure, checking and adjusting
Specifications
(0) GENERAL
Capacities, (litres)
Dimensions
Section 2 Engine
Section 3 Electrical system
Section 4 Power transmission
Section 5 Brakes
Section 6 Steering system
Section 9 Hydraulic system
Tightening torques
VOLVO standard tightening torques
Weights, (approx.)
(2) ENGINE WITH MOUNTING AND EQUIPMENT
Capacities
Checking stalling speed
Fuel feed pump specifications
Injection pump specifications
Injector specifications
Specifications, air cleaner
Specifications, capacities
Specifications, general 2
Specifications, general
Tightening torques
Valve mechanism specifications
Weights
(3) ELEC. SYSTEM; WARNING SYSTEM; INFORMATION SYSTEM; INSTRUMENTS
Alternator, description
Alternator, specifications
Battery, specifications
Electrical system, specifications
Lighting, description
Lights, specifications
Preheating, description
Starter motor, specifications
Starting system, description
(4) POWER TRANSMISSION
Specifications 2
Specifications
(5) BRAKE
(6) STEERING
Specifications, general 2
Specifications, general
Specifications, tightening torques
(7) FRAME; SPRINGS; DAMPING; AXLE SUSPENSION; WHEEL, TRACK UNIT
Specifications, weight
Tightening torques
(8) MACHINERY HOUSE; CAB; EXTERIOR TRIM PARTS ANYWHERE
Weights
Tightening torques
(9) HYDRAULIC SYSTEM, DIGGING, HANDLING, GRADING EQUIPM, MISC. EQUIP
Specifications, general
Specifications