VOLVO L90C WHEEL LOADER SERVICE REPAIR MANUAL PDF – 827 PAGES

The Volvo L90C Wheel Loader Service Repair Manual provides detailed technical information for the maintenance, troubleshooting, servicing, adjustment, and repair of the Volvo L90C wheel loader.

This comprehensive 827-page PDF manual covers the engine, fuel system, electrical equipment, electronic monitoring, power transmission, braking system, steering, frame, operator cab, and working hydraulics.

The documentation includes service procedures, component descriptions, electrical wiring diagrams, hydraulic circuit diagrams, troubleshooting information, installation instructions, technical specifications, and tightening torque references.

Particular attention is given to the Contronic electronic monitoring system, transmission diagnostics, Comfort Drive Control (CDC), Boom Suspension System, hydraulic pressure adjustments, and electrical component testing.

This manual is a valuable technical resource for professional heavy equipment mechanics, construction machinery repair workshops, fleet maintenance departments, and Volvo L90C wheel loader owners.

MANUAL DETAILS

• Manufacturer: Volvo Construction Equipment
• Equipment Model: L90C Wheel Loader
• Manual Type: Service Repair Manual
• File Format: PDF
• Number of Pages: 827
• Delivery: Digital Download

WHAT IS INCLUDED IN THIS SERVICE REPAIR MANUAL?

The documentation contains installation instructions and repair information organized into the major technical groups of the Volvo L90C wheel loader.

1. INSTALLATION INSTRUCTIONS

The installation section provides instructions for selected optional equipment, attachments, and accessories.

Included topics:

• Third hydraulic function
• Fourth hydraulic function
• Hydraulic attachment brackets
• Hydraulic attachment locking systems
• CareTrack equipment
• Electrical engine heaters
• Engine heater installation for 120 V applications
• Operator seat installation kits
• Seat belt equipment
• Radio installation kits
• Rotating warning beacon
• Front and rear working lights
• Headlamp protective grilles
• Sun blinds
• Windscreen washer equipment

These instructions help technicians install or service applicable accessories and equipment configurations.

2. GENERAL SERVICE INFORMATION

The general section contains reference information for servicing and maintaining the Volvo L90C.

Topics include:

• Machine descriptions
• Product identification plates
• Volvo standard tightening torques
• Service time guide
• Recommended lubricants
• Cleanliness requirements for brake and hydraulic systems
• Electrical welding precautions
• Manual parking brake release
• Propeller shaft removal
• Hydraulic system repair precautions
• Machine towing
• Transporting the wheel loader on another vehicle

3. ENGINE SERVICE AND REPAIR

The engine section provides technical procedures for engine inspection, adjustment, servicing, and component replacement.

ENGINE MECHANICAL SERVICE

• Engine removal and installation
• Engine speed checks
• Idle speed adjustment
• Engine valve adjustment
• Engine oil pump removal and installation
• Engine coolant pump removal and installation
• Intercooler coolant pump servicing
• Intercooler coolant pump reconditioning

FUEL SYSTEM SERVICE

• Fuel feed pump pressure testing
• Fuel system air bleeding
• Fuel tank removal and installation
• Injection timing checks and adjustment
• Engine stop solenoid adjustment
• Engine stop solenoid troubleshooting

ENGINE TECHNICAL REFERENCES

• Engine specifications
• Engine capacities
• Component weights
• Tightening torque specifications
• Engine operating and service information

4. ELECTRICAL SYSTEM AND CONTRONIC DIAGNOSTICS

The manual includes extensive documentation for the Volvo L90C electrical system and electronic monitoring equipment.

ELECTRICAL SYSTEM INFORMATION

• Electrical system descriptions
• Electronic Control Unit (ECU) functions
• Contronic Service Display Unit
• Electrical distribution boxes
• Instrument panels and controls
• Electrical component locations
• Electrical circuit identification
• Component and cable markings
• Electrical repair equipment
• Battery safety procedures

SENSOR AND COMPONENT TESTING

Procedures include checking:

• Engine speed sensors
• Engine temperature sensors
• Transmission oil pressure sensors
• Transmission oil temperature sensors
• Brake pressure sensors
• Parking brake pressure sensors
• Steering pressure sensors
• Axle oil temperature sensors
• Fuel level sensors
• Travelling speed sensors
• Boom kick-out sensors
• Bucket positioner sensors
• Air conditioning sensors
• Differential pressure sensors

ELECTRONIC MONITORING AND MACHINE FUNCTIONS

• Contronic monitoring functions
• Control unit input and output information
• Limp-home operating procedures
• Transmission monitoring
• Gear shifting functions
• Preheating functions
• Automatic greasing equipment
• Boom Suspension System electrical functions
• Comfort Drive Control (CDC) electrical functions
• Single-lever control systems

5. ELECTRICAL WIRING DIAGRAMS

The manual includes numerous numbered electrical wiring diagrams for the Volvo L90C.

The documentation covers electrical circuits identified in the catalog from Circuit 1 through Circuit 33, with applicable circuit variants and explanations.

Included references:

• Wiring diagram circuit identification
• Electrical component locations
• Cable and component marking explanations
• Electronic control system circuits
• Sensor and monitoring circuits
• Machine operating controls
• Lighting and electrical accessories
• Air conditioning and climate control wiring

These diagrams are useful for tracing electrical connections, checking circuits, and investigating component faults.

6. POWER TRANSMISSION AND AXLE REPAIR

The power transmission section covers transmission operation, troubleshooting, adjustment, and repair.

TRANSMISSION SERVICE

• Transmission operating principles
• Transmission removal and installation
• Transmission oil pressure testing
• Gear selector valve description
• Transmission troubleshooting
• Limp-home operation
• Transmission hydraulic reference diagrams

DRIVE AXLES AND DIFFERENTIALS

• Front axle removal and installation
• Rear axle removal and installation
• Differential lock adjustment
• Rear axle suspension inspection
• Axle clearance measurements
• Rear axle bridge clearance adjustment
• Differential carrier wear ring replacement

TRANSMISSION TECHNICAL REFERENCES

• Transmission specifications
• Oil capacities
• Component weights
• Hydraulic transmission diagrams

7. BRAKE SYSTEM SERVICE AND REPAIR

The braking system section provides procedures for inspection, adjustment, troubleshooting, and component servicing.

Included topics:

• Brake system operation
• Brake system hydraulic diagram
• Brake accumulator inspection
• Brake disc wear measurement
• Brake disc replacement
• Brake system air bleeding
• Brake retardation function testing
• Brake hydraulic pressure testing and adjustment
• Foot brake pedal adjustment
• Foot brake valve reconditioning
• Parking brake inspection and adjustment
• Parking brake disc replacement
• Brake wear indicator information

8. STEERING SYSTEM SERVICE AND REPAIR

The steering section contains descriptions, hydraulic diagrams, function tests, and repair procedures.

STEERING SYSTEM COMPONENTS

• Steering pump
• Steering valve
• Steering cylinders
• Hydraulic steering controls
• Secondary steering equipment
• Comfort Drive Control (CDC)

STEERING SERVICE PROCEDURES

• Steering function testing
• Steering pressure testing and adjustment
• Steering cylinder replacement
• Steering pump reconditioning
• Steering control valve inspection
• Lever steering speed adjustment
• Steering control valve adjustment
• Steering lever electrical input and output voltage testing

STEERING HYDRAULIC DIAGRAMS

• Basic machine steering hydraulic diagram
• Comfort Drive Control hydraulic diagrams
• Secondary steering hydraulic diagrams

9. FRAME AND STRUCTURAL COMPONENTS

The manual provides technical information for selected structural components.

Included topics:

• Frame descriptions
• Frame joint bearing replacement
• Structural component specifications
• Component weights
• Tightening torque references

10. OPERATOR CAB AND AIR CONDITIONING

The cab section includes servicing procedures and technical information for operator cab components and climate control equipment.

CAB SERVICE

• Cab removal and installation
• Windscreen replacement and sealing
• Rear window replacement and sealing
• Side window replacement and sealing

AIR CONDITIONING

• Air conditioning system operation
• Air conditioning performance testing
• Refrigerant information
• Electrical climate control system descriptions
• Air conditioning safety information
• Climate control and air conditioning wiring diagrams

11. HYDRAULIC SYSTEM AND WORKING EQUIPMENT

The hydraulic section covers the working hydraulic system, Boom Suspension System, lift and tilt functions, and associated pressure controls.

WORKING HYDRAULIC SYSTEM

• Working hydraulic system descriptions
• Working hydraulic diagrams
• Hydraulic control valve information
• Working pressure testing and adjustment
• Servo hydraulic pressure testing
• Hydraulic accumulator inspection
• Hydraulic pressure reduction valves
• Hydraulic safety valve testing

BOOM SUSPENSION SYSTEM

• Boom Suspension System operation
• Boom Suspension System function checks
• Accumulator pressure testing
• Accumulator precharge adjustment
• Accumulator reconditioning
• Safe release of accumulator pressure

LIFT AND TILT FUNCTIONS

• Lift cylinder replacement
• Lift cylinder seal replacement
• Lift cylinder bushing replacement
• Tilt cylinder replacement
• Tilt cylinder seal replacement
• Tilt cylinder bearing replacement
• Boom kick-out adjustment
• Bucket positioner adjustment
• Lift and tilt shock valve testing
• Anti-cavitation valve information

ADDITIONAL HYDRAULIC EQUIPMENT

• Fourth hydraulic function
• Servo valve operating controls
• TP-linkage bearing points
• Hydraulic circuit pressure checks
• Hydraulic capacities and specifications

TROUBLESHOOTING AND DIAGNOSTIC INFORMATION

The Volvo L90C manual provides troubleshooting and testing information for:

• Engine operating problems
• Fuel system faults
• Engine stop solenoid problems
• Electrical component faults
• Contronic electronic monitoring
• Transmission operation
• Brake pressure and function
• Steering pressure and function
• Hydraulic pressure and valve operation
• Air conditioning performance

The combination of electrical wiring diagrams, hydraulic diagrams, component descriptions, and service procedures helps technicians investigate faults systematically.

TECHNICAL SPECIFICATIONS AND SERVICE DATA

The manual includes reference information such as:

• Engine specifications and capacities
• Engine tightening torques
• Power transmission specifications
• Transmission capacities
• Brake system specifications
• Steering system specifications
• Hydraulic system specifications
• Hydraulic oil capacities
• Component weights
• Recommended lubricants
• Volvo standard tightening torques

BENEFITS OF THIS SERVICE REPAIR MANUAL

This manual can help users:

• Understand Volvo L90C machine systems
• Access detailed service and repair procedures
• Locate electrical components and sensors
• Consult electrical wiring diagrams
• Diagnose Contronic monitoring faults
• Check transmission operation and hydraulic pressures
• Maintain braking and steering systems
• Repair hydraulic cylinders and control components
• Service Boom Suspension System equipment
• Consult technical specifications and tightening torque information

WHO IS THIS MANUAL FOR?

This publication is suitable for:

• Professional Volvo construction equipment mechanics
• Heavy equipment service technicians
• Construction machinery repair workshops
• Fleet maintenance departments
• Equipment maintenance companies
• Volvo L90C wheel loader owners responsible for servicing and repairs

IMPORTANT COMPATIBILITY INFORMATION

This manual is identified for the Volvo L90C Wheel Loader.

Before purchasing, verify the machine model, serial number, installed equipment, and relevant configuration.

Some procedures and diagrams may apply only to particular machine versions or optional equipment.

DIGITAL PDF DOWNLOAD

This product is supplied as a digital PDF service repair manual.

• 827 pages of technical documentation
• Engine service and repair procedures
• Fuel injection system adjustments
• Electrical wiring diagrams
• Contronic diagnostic information
• Transmission and axle repair procedures
• Brake and steering system servicing
• Hydraulic circuit diagrams
• Boom Suspension System maintenance
• Cab and air conditioning information
• Technical specifications and service data
• Digital delivery – no printed book will be shipped

A compatible PDF reader is required to access the document.

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Detailed content:

COVER
Installation Instruction
3rd hydraulic function
4th hydraulic function (2)
4th HYDRAULIC FUNCTION
Arbetsbelysning, främre
Attachment bracket with attachment locking, (Optimal)
Attachment lock
Attachment locking
Care Track
Electrical engine heater
Engine heater, 120 V (USA)
Hip belt
Installation kit for operators seat (2)
Installation kit for operators seat
Kit for fitting the radio
Protective grille, headlamp
Rotating beacon
Sun blind
Windscreen washer
Working light, rear
Repair
(0) GENERAL
Description
Product identification plates
Section 4 Power transmission
Section 5 Brakes
Time Guide
Volvo standard tightening torques
(1) STANDARD PARTS, SERVICE
Cleanliness, brake and hydraulic systems
Electric welding
Manual release of parking brake
Recommended lubricants
Removing propeller shafts
Repairing hydraulic system
Towing
Transporting wheel loader on another vehicle
(2) ENGINE WITH MOUNTING AND EQUIPMENT
Checking speed with a frequency meter
Coolant pump for intercooler, reconditioning
Coolant pump for intercooler, removing and installing
Coolant pump, removing and installing
Description
Engine, installing
Engine, removing
Feed pump, checking feed pressure
Fuel system, air bleeding
Fuel tank, removing and installing
Idling speed, checking and adjusting
Injection timing, checking and adjusting
Oil pump, removing and installing
Specifications, capacities (2)
Specifications, capacities (3)
Specifications, capacities
Specifications, general (2)
Specifications, general (3)
Specifications, general (4)
Specifications, general (5)
Specifications, general (6)
Specifications, general (7)
Specifications, general (8)
Specifications, general (9)
Specifications, general (10)
Specifications, general (11)
Specifications, general (12)
Specifications, general
Specifications, tightening torques (2)
Specifications, tightening torques (3)
Specifications, tightening torques
Specifications, weights (2)
Specifications, weights
Stop solenoid, adjusting stroke (2)
Stop solenoid, adjusting stroke
Stop solenoid, fault-tracing tips
Stop solenoid
Valves, adjusting
(3) ELEC. SYSTEM; WARNING SYSTEM; INFORMATION SYSTEM; INSTRUMENTS
Air conditioning, pressure monitor, SE22, checking
Air conditioning, thermostat, SE21, checking
Air conditioning∗ (2)
Air conditioning∗
Air filter, SE7, checking
Automatic greasing∗
Axle oil temperature, SE84 and SE84, checking
Boom kick-out, SE33, checking
Boom Suspension System∗ (2)
Boom Suspension System∗
Brake pressure, SE14, checking
Bucket positioner, SE35, checking
Code key for diodes
Codes used in wiring diagrams
Component location (2)
Component location (3)
Component location (4)
Component location (5)
Component location (6)
Component location (7)
Component location (8)
Component location (9)
Component location (10)
Component location (11)
Component location (12)
Component location (13)
Component location (14)
Component location (15)
Component location (16)
Component location (17)
Component location (18)
Component location (19)
Component location (20)
Component location (21)
Component location (22)
Component location (23)
Component location
Contronic Service Display Unit
Differential pressure, SE51, checking
Dual control∗
Electrical distribution box in cab
Electrical distribution box
Electrical repair kit
Engine speed, SE3, checking
Engine temperature, SE1, checking
Explanations of wiring diagrams (lead and component marking)
Fuel level, SE17, checking
General description of the control unit (ECU)
General description
Headlights, adjusting
Instruments and controls
Lever steering, CDC∗ (2)
Lever steering, CDC∗ (3)
Lever steering, CDC∗
Limp-Home operation, gear shifting
Limp-Home operation, monitoring
Limp-Home operation, preheating
Limp-Home operation
List of circuits
Loud tone horn∗, seat with air suspension∗
Magnetising, 100 A alternator∗
Monitored functions
Other electrical functions (controlled by the control unit)
Parking brake pressure, SE6, checking
Safety when working with batteries
Single lever control, CDC, 4 gears
Single lever control, gear shifting
Single lever control, servo hydraulics
Special instructions for working on the electrical system
Specifications, general (2)
Specifications, general (3)
Specifications, general (4)
Specifications, general (5)
Specifications, general (6)
Specifications, general
Steering pressure, SE15, checking
Stop lights, SE29, checking
Transmission disengagement, SE2, checking
Transmission oil pressure, SE12, checking
Transmission oil temperature, SE11, checking
Travelling speed, SE4, checking
Units connected to the control unit
Wiring diagram, circuit 1 1 — 1 10
Wiring diagram, circuit 2 1 — 2 10
Wiring diagram, circuit 3 1 — 3 10
Wiring diagram, circuit 4 1 — 4 10
Wiring diagram, circuit 5 1 — 5 10
Wiring diagram, circuit 6 1 — 6 10
Wiring diagram, circuit 7 1 — 7 10 (2)
Wiring diagram, circuit 7 1 — 7 10
Wiring diagram, circuit 8 1 — 8 10
Wiring diagram, circuit 9 1 — 9 7
Wiring diagram, circuit 10 1 — 10 8
Wiring diagram, circuit 11 1 — 11 7 (2)
Wiring diagram, circuit 11 1 — 11 7 (3)
Wiring diagram, circuit 11 1 — 11 7 (4)
Wiring diagram, circuit 11 1 — 11 7 (5)
Wiring diagram, circuit 11 1 — 11 7
Wiring diagram, circuit 12 1 — 12 10
Wiring diagram, circuit 13 1 — 13 10 (2)
Wiring diagram, circuit 13 1 — 13 10
Wiring diagram, circuit 14 1 — 14 10
Wiring diagram, circuit 15 1 — 15 7
Wiring diagram, circuit 16 1 — 16 8
Wiring diagram, circuit 17 1 — 17 5
Wiring diagram, circuit 18 1 — 18 8
Wiring diagram, circuit 19 1 — 19 7 (2)
Wiring diagram, circuit 19 1 — 19 7
Wiring diagram, circuit 20 1 — 20 7 (2)
Wiring diagram, circuit 20 1 — 20 7 (3)
Wiring diagram, circuit 20 1 — 20 7
Wiring diagram, circuit 21 1 — 21 7
Wiring diagram, circuit 22 1 — 22 8 (2)
Wiring diagram, circuit 22 1 — 22 8
Wiring diagram, circuit 23 1 — 23 8
Wiring diagram, circuit 24 1 — 24 6
Wiring diagram, circuit 25 1 — 25 9
Wiring diagram, circuit 27B 1 — 27B 10
Wiring diagram, circuit 30 1 — 30 10
Wiring diagram, circuit 31 1 — 31 7
Wiring diagram, circuit 32 1 — 32 10
Wiring diagram, circuit 33 1 — 33 10
(4) POWRER TRANSMISSION
Description
Differential lock, adjusting
Drive axles, description
Front axle, installing
Front axle, removing
Gear selector valve, description
Limp-Home operation
Rear axle suspension, description
Rear axle suspension, measuring axial and radial clearance
Rear axle, installing
Rear axle, removing
Specifications, capacities (dm (2)
Specifications, capacities (dm (3)
Specifications, capacities (dm (4)
Specifications, capacities (dm
Specifications, general (2)
Specifications, general (3)
Specifications, general (4)
Specifications, general (5)
Specifications, general
Specifications, weights (2)
Specifications, weights (3)
Specifications, weights (4)
Specifications, weights (5)
Specifications, weights
Symbol diagram HT131, L90C
Symbol diagram HT205, L120C
The axial clearance of the rear axle bridge, adjusting
Transmission, checking oil pressure
Transmission, description
Transmission, installing
Transmission, removing
Trouble-shooting tips
Wear ring (differential carrier assembly), replacing
(5) BRAKE
Accumulator, checking (removed)
Brake discs, checking wear (with built-in wear indicator)
Brake discs, checking wear (without built-in wear indicator)
Brake discs, replacing (with built-in wear indicator)
Brake discs, replacing (without built-in wear indicator)
Brake system, air bleeding
Brake system, retardation, checking function
Checking function
Description (2)
Description (3)
Description
Discarded accumulators
Foot brake pedal, adjusting angle and pedal free travel
Foot brake valve (removed), reconditioning
Function
Hydraulic diagram
Parking brake (mechanically operated), checking and adjusting
Parking brake, replacing discs
Pressure in circuit, checking and adjusting
Specifications, general (2)
Specifications, general (3)
Specifications, general (4)
Specifications, general (5)
Specifications, general
Wear indicator, description
(6) STEERING
Description (2)
Description of function
Description, general
Description
Function test
Hydraulic diagram, basic machine
Hydraulic diagram, lever steering (CDC)∗ and secondary steering∗
Hydraulic diagram, lever steering (CDC)∗
Hydraulic diagram, secondary steering∗
Hydraulic system, description
Lever steering, adjusting steering speed
Lever steering, checking and adjusting control valve
Specifications, general (2)
Specifications, general
Stand-by pressure and working pressure, checking and adjusting
Steering cylinder, description
Steering cylinder, replacing
Steering lever CU3, checking input output voltage
Steering pump, description
Steering pump, reconditioning (removed)
Steering valve, description
(7) FRAME;SPRINGS;DAMPING;AXLE SUSPENSION; WHEEL TRACK UNIT
Description
Frame joint, replacing bearings
Specifications, tightening torques
Specifications, weights (2)
Specifications, weights (3)
Specifications, weights (4)
Specifications, weights
(8) MACHINERY HOUSE;CAB;EXTERIOR TRIM PARTS ANYWHERE
AC-safety, description of function
Air conditioning, performance test
Cab, installing
Cab, removing
Description (2)
Description (3)
Description (4)
Description
Electrical system, air conditioning, description of function
Rear window, replacing
Rear window, sealing
Refrigerant in air conditioning
Specifications, weights
Windscreen side pane, replacing and sealing
Windscreen, replacing and sealing
Windscreen, sealing
Wiring diagram, climate control system and air conditioning
(9) HYDRAULIC SYSTEM;DIGGING HANDING GRANDING EQUIPM.; MISC. EQUIP
4th hydraulic function, description
Accumulator for Boom Suspension System, releasing pressure
Accumulator, Boom Suspension System, reconditioning
Accumulator, precharging pressure, checking and adjusting
Back-up valve, opening pressure, checking
Bearing points in TP-linkage
Boom kick-out and bucket positioner, adjusting
Boom Suspension System, checking
Boom Suspension System
Control valve
Description
Hydraulic diagrams, working hydraulics
Lifting arm, replacing bearings at lower bucket or attachment mounting
Lifting cylinder, changing seals in machine
Lifting cylinder, replacing bushings (removed)
Lifting cylinder, replacing
Lifting tilting cylinder, (principle diagram)
Pressure back-up for servo circuit, accumulator checking
Pressure-reducing valves R1 and R2,
Releasing the hydraulic oil pressure in the accumulator
Safety valve TB, checking opening pressure
Servo pressure, checking and adjusting (2)
Servo pressure, checking and adjusting
Servo pressure, checking at spool in control valve
Servo valve, description of function
Servo valve, operating controls, adjusting
Shock and anti-cavitation valve
Shock valve, lifting function, checking and adjusting
Shock valve, tilting function, checking and adjusting
Specifications, capacities (2)
Specifications, capacities
Specifications, general (2)
Specifications, general (3)
Specifications, general (4)
Specifications, general (5)
Specifications, general (6)
Specifications, general
Specifications, weights (2)
Specifications, weights (3)
Specifications, weights
Tilting cylinder, changing seals in machine
Tilting cylinder, replacing bearings (removed)
Tilting cylinder, replacing
Working hydraulics, description
Working pressure, checking and adjusting