AVANT 645i Operator's Manual

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Avant Tecno USA

1450 E . Algonquin R d.

Arlington Heights, IL 60005

Tel: 847 380 9822

AVANT 645i/650i

Operator's Manual

A465650EN 2025 1

sales@ avattecnousa.com

WWW.AVANTTECNOUSA.COM

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Page 1 English North America AVANT 645i/650i Operator's Manual A465650EN 2025 1 Avant Tecno USA 1450 E . Algonquin R d. Arlington Heights, IL 60005 sales@ avattecnousa.com WWW.AVANTTECNOUSA.COM Tel: 847 380 9822...
Page 2 Avant 645i 650i Safety First California Proposition 65 Warning DIESEL EXHAUST WARNING Breathing diesel engine exhaust exposes you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.  Always start and operate the engine in a well- ventilated area.
Page 3: Table Of Contents
Avant 645i 650i 2025 1 TABLE OF CONTENTS Lights ..................94 Cabs (option) ................96 INTRODUCTION ............4 OPERATING INSTRUCTIONS ......... 101 Foreword ................. 4 Starting the loader ..............102 Intended use ................6 Stopping the engine (Safe stopping procedure) ....105 Make sure all relevant manuals are available.....
Page 4: Introduction
Foreword AVANT TECNO OY wants to thank you for purchasing this AVANT loader. It is the result of Avant’s long experience in design and manufacturing of compact loaders. We ask you that you read and understand the contents of this manual completely before operating the loader.
Page 5: Terms Used In This Manual
This manual is available in other languages as well This manual, all warning labels, as well as attachment operator's manuals, are available in other languages as well. Contact your AVANT dealer for a copy of instructions in needed language to make sure all operator's can understand the instructions.
Page 6: Intended Use
To make sure that the load control system works as intended, the system must be calibrated by Avant service according to the maintenance instructions in this manual.
Page 7: Make Sure All Relevant Manuals Are Available
Always read the Operator's Manual of each attachment carefully. Contact your local Avant dealer for any questions, service, spare parts or about any problems that may occur with the operation of your loader or its attachments.
Page 8: Operator Qualification
Some equipment or options that are shown in this Operator's Manual may not be available. Pictures in this Operator's Manual may show optional equipment. Availability of optional equipment is subject to change. Some options may preclude the installation and use of some other option or options. Check with your Avant dealer for more information.
Page 9: Warranty
1000 hours of use, whichever occurs first, commencing on the original date of purchase from Avant or an authorized Avant dealer (the "Warranty Period") that its Avant 645i 650i loaders (the "Products") will be free from all defects in material and workmanship (the "Limited Warranty").
Page 10 Limitation of Remedies: In the event a Product is found to be non-conforming with the Limited Warranty set forth herein during the Warranty Period, AVANT will, at its option, either repair the same or supply a replacement thereof. THE FOREGOING STATES THE ENTIRE LIABILITY AND OBLIGATIONS OF AVANT WITH REGARD TO THE...
Page 11: Safety First
Avant 645i 650i Safety First Safety First Incorrect or careless use of the loader can cause a serious accident. Before you operate the loader, familiarise yourself with the correct use of the loader. Read and understand this Operator's Manual, as well as all relevant safety instructions, local regulations, and safe working practices.
Page 12 Never operate the loader or attachments while allowed with the attachment designed for this under the influence of alcohol, drugs, medication purpose: the Avant Leguan 50 access platform, that may impair judgment or cause drowsiness, following the instructions in the Operator's or if not otherwise medically fit to operate the Manual of Leguan 50 attachment.
Page 13 Avant 645i 650i Safety First Risk of crushing under boom or Hydraulic pressure - Risk of attachment - Stay away from serious injury. lifted boom and attachment. Hydraulic hoses other Always remember that load can fall hydraulic components may have...
Page 14 Safety First Avant 645i 650i Risk of serious injury or death Risk of crushing between tyres - WARNING CAUTION from falling objects. Do not turn the steering wheel while standing near the loader. Never tilt the attachment back when it is lifted high. Operate only...
Page 15 Avant 645i 650i Safety First Hazardous areas around the loader Asphyxiation hazard - Ensure ventilation Make sure that there are no persons in the danger zone of the loader or the attachment. The safe Asphyxiation hazard Ensure distance to other persons depends on the attachment ventilation.
Page 16 Safety First Avant 645i 650i Hot exhaust gas Exposure diesel engine WARNING exhaust cause cancer. Burning diesel fuel produces Extremely hot exhaust gas and many potentially cancer-causing exhaust pipe - Never run the substances that are present in the exhaust of diesel engines.
Page 17: Handling Of Heavy Loads
Avant 645i 650i Safety First Handling of heavy loads Whenever you handle heavy loads or heavy attachments: Risk of tipping over - Handle  WARNING Always handle heavy loads only on firm, level heavy loads and attachments ground while you drive slowly with the loader.
Page 18 Safety First Avant 645i 650i Risk of overturning - Articulated Load control system: WARNING frame. Turning articulated frame The loader is equipped with a load control system. The load control system includes a load indicator system can lead to overturning of the and load control system.
Page 19: Operation On Uneven Surfaces, Gradients, And Near Excavations
Avant 645i 650i Safety First Operation on uneven surfaces, If the warning is triggered by the gradients, and near excavations WARNING load indicator system:  If loader is driven, bring the Uneven ground can cause the loader slowly to stop.
Page 20 Safety First Avant 645i 650i Whenever you operate the loader on uneven Risk of tipping over on uneven ground keep the following in mind: WARNING ground Drive slowly  Handle heavy loads only on inclined surfaces. Always keep even surfaces. Lifting a load WARNING load close to the ground.
Page 21: Personal Safety And Protective Equipment
Avant 645i 650i Safety First  When working construction Personal safety and protective sites, safety helmet equipment recommended mandatory in addition to the falling Risk of personal injuries objects protective structure WARNING (FOPS) on the loader. Always wear safe clothing and ...
Page 22 If damaged, authorised Avant representative. If you modify the loader or attachment, it can become dangerous and contact service. cause serious injuries or even death. Unauthorised...
Page 23 Avant 645i 650i Safety First In case of inadvertent contact or proximity with live Working near powerlines electric source, or if electric cables are exposed during digging: Electrocution hazard - Stay away  Do not leave the loader until the electricity has from electric cables.
Page 24 Safety First Avant 645i 650i Safety of digging Risk of serious injury or death - Plan all digging work ahead. Accidental or intended contact with electric cables, pipes, telecommunications cables, water mains, or other structures buried in ground can cause serious injuries fatal.
Page 25: Electric System And Handling Of The Battery
Avant 645i 650i Safety First Electric system and handling of the battery The battery of the 12 V electric system of the loader is WARNING Lead acid batteries produce located under the rear right cover plate. flammable and explosive gases Always handle the battery with care.
Page 26: Fire Prevention
Safety First Avant 645i 650i  Fire prevention If fuse is blown repeatedly, find out the cause. Always use fuses with correct rating. Clean the loader to avoid build-up of flammable debris,  Read the instructions for jump start, see page such as dust, leaves, hay, straw, etc.
Page 27: Battery Disconnect Switch
Avant 645i 650i Safety First Fire hazard - Always disconnect Battery disconnect switch WARNING battery when the loader is not The loader is equipped used and always keep loader with battery disconnect switch. The clean. switch is located at the...
Page 28: Description Of The Loader
Write down the serial number and the manufacturing week of your loader and have them ready when you communicate with your dealer or Avant dealer or service partner. The serial number together with the manufacturing week make it possible to identify the...
Page 29 The engine ID label shows information about the engine model and serial number, and type approval information. The Kubota V1505 CR-T engine on Avant 645i and 650i is certified for both EU Stage V and US EPA/CARB Tier 4. Both EU and EPA/CARB labels are located on the top of the engine valve cover. The labels show information about...
Page 30: Main Parts Of The Loader
Description of the loader Avant 645i 650i Main parts of the loader The following picture shows the main parts of the loader. These general parts are the same regardless of the cab type. 1. Front frame 5. Attachment coupling plate On the front frame are mounted: driver’s seat,...
Page 31: Signs And Decals
Make sure that the following signs and decals are clean, undamaged and readable. If any of these decals is missing or is unreadable stop using the loader until decal has been replaced. Ask for new decals from your local Avant dealer. Labels on loaders with ROPS canopy...
Page 32 Description of the loader Avant 645i 650i Table 2 - List of safety labels and markings on the machine Label: ROPS canopy or Cab L Product code: A442249 This decal includes multiple individual warnings. All warnings in Location this decal are described separately below.
Page 33 Avant 645i 650i Description of the loader Label 1 continued (A442249 & A464216) Message Always follow all warnings and instructions. Instructions and warnings are provided for your safety.
Page 34 Description of the loader Avant 645i 650i Label Message WARNING PERSONAL INJURY HAZARD Always wear: hearing protection, gloves and safety shoes. Find additional protective equipment is required due to worksite or attachment, such as: eye protection, respirator mask, high visibility clothing, protective helmet.
Page 35 Avant 645i 650i Description of the loader Label Message WARNING FIRE HAZARD Turn the battery disconnect switch to OFF whenever leaving loader unattended. Make sure there is no flammable material near engine. FOLLOW SERVICE SCHEDULE Unserviced loader and flammable materials in engine bay can cause risks of injuries or fire.
Page 36 Description of the loader Avant 645i 650i Label Message CAUTION On Avant 645i SUDDEN STOP HAZARD Product code Use parking brake to stop the loader only in emergency. A446538 Stop the loader before using the parking brake. Repeated use while driving will damage the drivetrain.
Page 37 Avant 645i 650i Description of the loader Label Message WARNING Hazards from wrong use or misuse of the loader - Read operator's manual and keep it available for all users. Store the operator's manual in its place behind the driver's seat.
Page 38 Description of the loader Avant 645i 650i Label Message WARNING NOISE HAZARD Noise level at driver's seat can reach 85 dB(A), or higher, depending on use and type of attachment. Continuous exposure to noise above 80 dB(A) can cause permanent hearing loss.
Page 39 Avant 645i 650i Description of the loader Label Message DANGER CRUSH HAZARD Keep away from lifted boom or attachment. Lower boom or attachment down on ground, or use service support. Location One label on top of the boom and two labels on each side of the boom.
Page 40 Description of the loader Avant 645i 650i Label Message CAUTION PINCH POINT Moving articulated frame can cause contact with legs. Stay away from area between wheels. Location Near loader articulation joint at loader entry point. Product code: A446551 CAUTION Risk of crushing and injury to legs - Ballasted tires are heavy.
Page 41 Avant 645i 650i Description of the loader Label Message WARNING HYDRAULIC OIL INJECTION HAZARD. RISK OF SERIOUS INJURY. Never use hands to search for leaks. Use piece of wood or cardboard. Relieve hydraulic system pressure before any service or troubleshoot.
Page 42 Description of the loader Avant 645i 650i Label Message WARNING BURN HAZARD Pressurized hot coolant can cause serious burn. Never open when hot. Stop engine and allow to cool. Location Engine compartment, on engine coolant reservoir. Product code: A446549 WARNING CUTTING AND SEVERING HAZARD Rotating fan.
Page 43 Avant 645i 650i Description of the loader Table 3 - Additional decals on loaders equipped with a cab The following labels are placed to the loader if the loader is equipped with Cab L or Cab GT. Label Message EMERGENCY EXIT Use the window hammer to break glass.
Page 44 Description of the loader Avant 645i 650i Table 4 - Information labels Label Message ROPS/FOPS Approval, on Location loaders with ROPS canopy or Cab L ROPS frame, inside Product code A416355 ROPS/FOPS Approval, on Location loaders with Cab GT Cab GT, inside...
Page 45 Avant 645i 650i Description of the loader Correct type of engine oil Location See page 50 Engine compartment Product code A446609 Correct type of hydraulic oil Location See page 160 Near hydraulic oil filler opening. The original hydraulic oil filled by the manufacturer is shown with one of the following labels.
Page 46: Technical Specifications
320/60-12" HD 650i: 3760 lb (1705 kg) 50.8 in (1290 mm) 80.1 in (2035 mm) 6016* Mass 645i: 3570 lb (1620 kg) 320/55-15" 51.2 in (1300 mm) 81.3 in (2065 mm) TR/GR Shipping weight ISO 6016 650i: 3600 lb (1630 kg) 26.5x14.00-12"...
Page 47 Avant 645i 650i Description of the loader...
Page 48: General Information
Standard: Faster multiconnector system on front. Auxiliary hydraulics Optional: Extra auxiliary hydraulics coupling on front or rear. Attachment coupling Avant quick coupling attachment plate Hydraulic oil tank capacity 10.0 gal (38 l) ISO VG 46, mineral oil only Hydraulic oil type...
Page 49: Engine Specifications
Emissions level, Avant 645i/650i Stage V & Tier 4 This version of Avant 645i/650i complies with both the EU 1628/2016 Stage V emission standard and the EPA&CARB Tier 4. Engine is marked with both labels.
Page 50: Engine Oil Requirements
Avant 645i 650i Engine oil requirements Kubota Engines (Avant 645i/650i): The diesel engine with common rail high pressure fuel injection requires high-quality engine oil in order to work properly. The oil must meet the API CJ-4 / Low S.A.P.S. class, and the viscosity recommendations that depend on ambient temperature.
Page 51: Tires
Use tyre and rim models that are recommended by Avant to ensure that the tires meet the dimension, load, and speed requirements for this loader model. Replace tires if there are visible damages on the tyre or rim, or if the wear surface of the tyre has worn, or if there are visible differences between the tires.
Page 52: Snow Chains
Description of the loader Avant 645i 650i Use the widest possible tires For the best stability and controllability, always use the widest tires possible. Tires that are narrower than the standard tires are intended for special purposes only with width restriction on the machine.
Page 53: Auxiliary Hydraulics Oil Flow
Avant 645i 650i Description of the loader Use only spacers recommended Auxiliary hydraulics oil flow by Avant Tecno Oy. Too thick spacers damage The following graphs show auxiliary hydraulics output hydraulic motors. Contact your flow at different engine rpm levels. The 1-pump setting...
Page 54 Description of the loader Avant 645i 650i...
Page 55: Lift Capacity
Avant 645i 650i Lift capacity Lift capacity Lift capacity describes the load the loader can handle. Risk of tipping over - Follow WARNING Lift capacity is limited by the following main factors: safety instructions. Know the Stability of the loader...
Page 56 Lift capacity Avant 645i 650i Falling load hazard - Never Definitions exceed the maximum load of the Any illustration, chart, table or value of tipping attachment. The lifting force of the load and the ROC table are valid only when the...
Page 57: Load Charts
In this Operator's Manual there is only a load chart for The load control system will stop the boom movements the pallet forks A36589. All Avant attachments have if there is a risk that the loader tips over its front axle...
Page 58: Load Control System
Lift capacity Avant 645i 650i Load control system When the warning is activated, the loader can tip forward because of the loader boom movements, The loader is equipped with a load control system. The acceleration or deceleration, steering of the loader, or load control system consists of a load indicator system uneven ground surface.
Page 59: Rated Operating Capacity
Avant 645i 650i Lift capacity Risk of tipping over - Observe Rated operating capacity WARNING the load indicator warning. When To easily determine how much load the loader can load indicator warning handle safely, a table of the tipping load and a...
Page 60 Lift capacity Avant 645i 650i Load chart on the left side of the label: The graphic on the left side of the label shows the distance of the load in different positions of the loader boom. In this graphic, and in the Rated operating capacity table, the load is placed so that its center of gravity is at 19.7 in (500 mm) forward from the vertical...
Page 61 Avant 645i 650i Lift capacity Rated operating capacity label A452699A, in pounds. The ROC table is valid, when:  The ground is firm and level  Loader is stationary or driven max 1 mph (2 km/h), with smooth and slow control movements ...
Page 62: Tipping Load - Load Diagram
 When the boom is lifted to horizontal position, the Load diagram 645i 650i tipping load is reduced to about 2280 lb (1035 kg) (line a in load diagram, the horizontal distance of the center of the load on forks increases to about...
Page 63 Avant 645i 650i Lift capacity How to estimate actual lifting capacity The actual tipping load and stability of the loader depends on many factors that you must consider when you handle heavy loads or attachments. Listed in the table below are many factors that influence the stability of the loader.
Page 64 Lift capacity Avant 645i 650i...
Page 65: Controls And Options Of The Loader
Avant 645i 650i Controls and options of the Loader Controls and options of the Loader This chapter describes the location and function of the controls of the loader. The location and function of controls may be slightly different in different models and cab versions. See the following pages for information about the controls and the options of the loader.
Page 66: Overview Of Controls
Controls and options of the Loader Avant 645i 650i Overview of controls Reference Page Dashboard Ignition switch Multi-function display Switches on the dashboard Indicator lights Control lever of boom and bucket Control levers Hand throttle lever Control switches on the panel...
Page 67 Avant 645i 650i Controls and options of the Loader Switches on the panel The number of the additional control switches depends on which options have been installed on the loader. The position and order of switches may be different than shown in this chapter.
Page 68: Dashboard
Controls and options of the Loader Avant 645i 650i Dashboard Cab GT The dashboard on the right side of the driver’s seat includes multi-function display, indicator lights and switches for controlling the loader. There are two versions of the dashboard depending on which cab is installed.
Page 69: Switches And Indicator Lights
Signal horn hazards requiring service. If this light remains lit, turn battery disconnect switch to OFF and contact Avant Cross-lock valve switch service. See page 108 Load indicator warning Warning: Too heavy load is being lifted.
Page 70: Multi-Function Display
Controls and options of the Loader Avant 645i 650i Multi-function display Hydraulic oil temperature: The background color of the center of display represents the The multi-function display shows basic information temperature of the hydraulic oil. Red background whenever the loader is running. The display also has signals that the hydraulic oil is hot.
Page 71 Avant 645i 650i Controls and options of the Loader Warning symbols, Engine and DPF Warnings and symbols on the display Symbol Colour Remarks Amber Check engine The display also shows information and warnings Engine fault requiring related to loader and its engine.
Page 72 Controls and options of the Loader Avant 645i 650i Warning and information symbols, loader Symbol Colour Remarks Safety alert symbol When this symbol appears, there is a safety related situation that needs action from operator. This symbol may appear by itself or with other warning symbols.
Page 73 Avant 645i 650i Controls and options of the Loader Load control symbols on the display Symbol Description Audible warning signal Load indicator system is active The loader symbol without frame indicates that the load indicator system is active but the load control system is inactive. The No audible signal.
Page 74 Follow safe shutdown procedure before restart. After shut down wait until display shuts down completely. Turn ignition key on again. Contact Avant service if the warning message persists after recommended actions and restart of the loader. Warning and information messages on display...
Page 75 Avant 645i 650i Controls and options of the Loader Text on display: Explanation: DPF: FORCED REGEN ON, DO DPF is being regenerated and process should not be disturbed. Message goes away when NOT DISTURB process is finished. DPF: ENGINEPOWER Soot level is over 100% of allowed. Only half of the engine power will be available.
Page 76 If you need to continue use of the boom floating, lower the boom down and activate the function again. RE-CALIBRATE LOAD Load indicator system needs to be re-calibrated. Contact Avant service. INDICATOR DISABLE SMOOTH DRIVE Smooth drive mode prevents activation of hydraulics. Switch smooth drive off. If you need to continue use of the smooth drive, activate the function again.
Page 77: Control Of Loader Boom, Auxiliary Hydraulics And Other Functions
Avant 645i 650i Controls and options of the Loader Control of loader boom, auxiliary hydraulics and other functions Most of the functions of the loader are controlled with the controls at the right side of the operator: Boom and bucket movements, auxiliary hydraulics (attachments), auxiliary hydraulics pump speed etc., depending on loader model.
Page 78: Telescopic Boom Control Lever
Controls and options of the Loader Avant 645i 650i 3. Telescopic boom control lever The telescopic boom makes many tasks easier, also those that do not involve lifting. You can, for example, push material further with a bucket, reach into difficult areas, and improve visibility to the work area with some attachments.
Page 79: Hand Throttle Lever
Avant 645i 650i Controls and options of the Loader 4. Hand throttle lever 5. Parking brake switch The engine running speed is controlled with the hand The parking brake is activated when loader is switched throttle lever. off or when hydraulic pressure is otherwise lost due to a failure.
Page 80: Joystick - 8 Function
Controls and options of the Loader Avant 645i 650i 2. Electric control of telescopic boom 6. Joystick - 8 function You can operate the telescopic The loader is equipped with an 8-function joystick. You boom with the rocker switch. can use either manual control lever or the electric...
Page 81: Opticontrol® (Option)
Opticontrol replaces previously available ® attachment. Attachment control switch pack option for Avant loaders. Operating modes of Opticontrol ® When the Opticontrol is installed to the loader, there ® Check the Operator's Manual of the attachment to see are the following additional features on the loader: how to control each attachment.
Page 82 Controls and options of the Loader Avant 645i 650i See the Operator’s Manual of each attachment for The attachment must be compatible with this operating recommended and maximum oil flow levels. mode. In this mode the auxiliary hydraulics control lever must be left to its middle position.
Page 83: Power Take Off Switch (Pto) And Load Control Override Switch
Avant 645i 650i Controls and options of the Loader Attachment control switch pack for Power take off switch (PTO) and Load rear mounted attachments (option) control override switch The functions of the attachment control switch pack The switch has two functions: are also available for rear mounted attachments.
Page 84: Boom Floating
12 V outlet of the loader. You can also contact your Avant dealer to fit an electric plug to the attachment multiconnector. Some attachments have a floating...
Page 85: Smooth Drive (Option)
Avant 645i 650i Controls and options of the Loader Boom self-levelling (option) Smooth drive (option) Avant 645i/650i loaders can be equipped with the Self-levelling is a system that smooth drive system that is a suspension system for keeps the attachment tilted in the boom.
Page 86: Counterweights
Counterweights are fitted, an attachment should be coupled to the loader. The standard counterweight on Avant 645i/650i loader is a 375 lb (170 kg) cast block mounted at the rear of the loader. In all technical information concerning the mass and lift capacity of the loader this counterweight is installed on the loader.
Page 87 Avant 645i 650i Controls and options of the Loader Additional counterweights Risk of loss of control of loader - WARNING Too much counterweight can Additional counterweights can be installed to increase the stability of loader when handling heavy loads or make the front of the loader too attachments.
Page 88: Adding Or Removing Counterweights
Controls and options of the Loader Avant 645i 650i b) When removing the counterweights, make Adding or removing counterweights sure to attach the hook onto it before loosening of bolts to avoid dropping of the counterweight. When installing removing counterweights appropriate lifting equipment must be used.
Page 89: Trailer Coupling (Option)
2 in (50 mm) ball hitch Trailer light connector is available as an option for A417323 Avant loaders. When towing a trailer with the loader on public roads, the trailer lights must be used. However, Max. allowed vertical load: 463 lb (210...
Page 90: Extra Auxiliary Hydraulics Outlets, Front And Rear (Option)
Controls and options of the Loader Avant 645i 650i Reverse buzzer (option) Extra auxiliary hydraulics outlets, front and rear (option) A reverse buzzer gives an audible signal whenever reversing with the loader. The buzzer alarms others of In addition to the standard auxiliary hydraulics outlet, an approaching machine.
Page 91: Seat - Seat Belt And Seat Adjustments
Avant 645i 650i Controls and options of the Loader Seat - Seat belt and seat adjustments Risk of falling from the loader Suspension seat WARNING and getting run over by loader - The suspension seat has the following adjustments: Never carry passengers. The seating capacity of the loader is strictly one person only.
Page 92: Full Suspension Seat (Option)
Lift the lever on the left side of the seat and lean forward backward select The full suspension seat is an option for Avant 645i comfortable backrest angle. 650i models. The full suspension seat with textile cover  Always make sure that the adjustment is is a standard on the Cab GT.
Page 93 Avant 645i 650i Controls and options of the Loader To adjust the air suspension seat: Adjust seat position  The distance of the seat from the steering wheel can be adjusted with the lever which is located under the front edge of the seat.
Page 94: Lights
Check panel. your local regulations concerning Avant work lights are LED modules. There are different the use of the loader on road brightness options, check your Avant dealer. areas, need for registration, and need for insurance.
Page 95: Light Control Switch
 Turn signals Warning lights on Cab GT (option) On Avant 645i/650i loaders with Cab GT flashing warning lights that are integrated to the cab are available as an option. There are two lights at the front and two at the back.
Page 96: Cabs (Option)
Controls and options of the Loader Avant 645i 650i Cabs (option) The Avant 645i 650i can be equipped with an enclosed Standard and optional equipment on different cab operator's cab. The Cab GT can only be ordered to models new loaders, it cannot be retrofitted. The ROPS...
Page 97: Cab Safety
Avant 645i 650i Controls and options of the Loader Glass break hazard Cab Safety CAUTION Driving with open door Make sure visibility from the cab is adequate. Keep all will cause the door to window panels clean and clear of snow, ice, etc.
Page 98: Ventilation And Heating
Controls and options of the Loader Avant 645i 650i Windscreen washer and wiper (Cab L) If used for heating, switch off the air circulation as soon as the On machines with Cab L the windscreen washer is temperature in the cab is sufficient, operated with a switch on the dashboard.
Page 99 Avant 645i 650i Controls and options of the Loader Risk of collision - Never drive CAUTION the loader when the visibility is poor. Do not drive unless basic visibility directions achieved. Allow the loader to warm up properly. Air conditioning (Option for Cab GT) Cab GT can be equipped, as an option, with air conditioning (cooling).
Page 100 Controls and options of the Loader Avant 645i 650i...
Page 101: Operating Instructions
Avant 645i 650i Operating instructions Operating instructions Always remember – safety first. Test all the functions of the loader at an open and safe place. Make sure that there are no persons in the operating area of the machine and the danger zone of the attachment.
Page 102: Starting The Loader
Operating instructions Avant 645i 650i Starting the loader Before start Risk of asphyxiation - Do not start the loader in enclosed Before starting the engine do the daily checks, see space - Exhaust emissions can page 138. kill within minutes.
Page 103: To Start The Engine
Avant 645i 650i Operating instructions Ignition key To start the engine Perform daily checks (see Maintenance & Service on page 131) Turn the battery disconnect switch to ON Sit on the driver's seat, adjust seat and fasten seat belt. The ignition key can be switched into the following The loader will not start unless driver is seated.
Page 104 Operating instructions Avant 645i 650i Risk of injury to bystanders - After starting: WARNING Avoid unintended movements of After starting the engine, complete the daily checks, see page 137. the attachment:  If the auxiliary hydraulics is switched on during starting...
Page 105: Stopping The Engine (Safe Stopping Procedure)
Disregarding given notifications and instructions speed runs extreme may cause the DPF to become clogged and requires an authorized Avant service technician. temperatures during the use of the Clearing of a clogged DPF is not covered by loader. To allow the turbocharger warranty.
Page 106: Drive Control
Avant 645i 650i Drive control Principle of operation Drive pedals Avant 645i/650i loader is equipped with a hydrostatic Using the drive pedals: drive system. This is based on a variable displacement hydraulic pump in the drive circuit that is proportionally controlled with the two drive pedals.
Page 107 Avant 645i 650i Operating instructions Drive speed range selection switch OptiDrive® Avant 650i is equipped with The loader is equipped with the efficient Avant two-speed hydraulic drive OptiDrive hydraulic drive system as standard. ® motors. Drive speed range can be selected with the...
Page 108 Operating instructions Avant 645i 650i X-lock (Cross-lock) and anti-slip Anti-slip valve (option) X-lock (Cross-lock) If the loader is equipped with the optional anti-slip The hydraulic drive circuit has a system that allows the valve, there is an additional switch on the back of the wheels on the left and right side of the loader to roll at joystick.
Page 109: Operation In Cold Conditions
If the loader is used constantly in high ambient temperatures, hydraulic oil type and viscosity must be suitable for these conditions. Contact Avant service. In case the braking power of the hydrostatic drive...
Page 110 Operating instructions Avant 645i 650i Risk of fire and electric shock - Risk electric shock WARNING CAUTION Check the voltage rating of the damage to loader - Disconnect block heater. Always block heater before approved type of cable. Check operating the loader. Make sure...
Page 111: Steering Of The Loader
Avant 645i 650i Operating instructions Steering of the loader Risk of collision and crushing - WARNING Steering of the loader is controlled with the steering Stay and keep hands and feet wheel. The steering system is hydraulically powered. A inside the safety frame. Always...
Page 112: Material Handling
ROPS. If you do not use Operator's Manual of an Avant attachment. seat belt, there is a risk of getting thrown off from the driver's seat Risk of tipping over - Loader can...
Page 113: In Case The Loader Tips Over
Avant 645i 650i Operating instructions In case the loader tips over Avoid tipping over of the loader with careful operation and with the instructions given throughout this Operator's Manual. However, it is important to know what to do in case the loader tips over.
Page 114 Operating instructions Avant 645i 650i...
Page 115: Working With Attachments
Any attachment mounted on the loader must meet applicable safety and technical standards and requirements. An attachment that is not specifically designed for the loader may cause unnecessary safety risks. Make sure that 645i 650i is specifically listed as compatible loader in the Operator's Manual of the attachment. Some attachments may require the use of additional special protective guards or personal safety equipment.
Page 116 Use only Avant attachments that have been designed for your loader model. Any attachment that is fitted to the loader must be designed to be used specifically with Avant 645i 650i, and this must be stated in the Operator's Manual of the attachment.
Page 117: Coupling The Attachments
Avant 645i 650i Working with attachments Coupling the attachments The attachment is mounted to the loader boom by using the quick coupling plate on the loader boom and the counterpart on the attachment. As standard, the attachment is coupled with two manually operated locking pins of the coupling plate.
Page 118 Working with attachments Avant 645i 650i Step 3:  Lift the boom slightly – pull the boom control lever backward to lift the attachment just off the ground.  Turn the boom control lever left to turn the bottom section of the quick coupling plate of the loader onto the attachment.
Page 119: Connecting The Hydraulic Hoses Of The Attachment
Avant 645i 650i Working with attachments Connecting the hydraulic hoses of the attachment Hydraulic hoses of the attachment are equipped with the multiconnector system, which connects all hoses at the same time. Risk of movement of the attachment and ejection of hydraulic oil - Never...
Page 120: Using The Auxiliary Hydraulics
Working with attachments Avant 645i 650i Using the auxiliary hydraulics Auxiliary hydraulics (hydraulically operated attachments) are controlled with the lever on the control panel, or with the buttons on the 8 function joystick (see page 77). The locking position of the lever facilitates operation of the attachments that require constant oil flow (rotary broom, backhoe etc.).
Page 121: Releasing The Residual Pressure Of Hydraulic System
Avant 645i 650i Working with attachments Releasing the residual pressure of hydraulic system Make sure that there is not pressure in the hydraulic system that could cause danger during service operations. To release the pressure in hydraulic system: Lower the boom down completely and place attachment firmly on the ground...
Page 122: Coupling Adapters
Avant 645i 650i Coupling adapters Avant offers coupling adapters to help the use of some specific attachments. See the Operator's Manual of each attachment if an adapter can be used. Also each adapter has their own Operator's manual. Always read the manual and keep it available.
Page 123 Avant 645i 650i Working with attachments Rotating adapter A424406 The rotating adapter is intended for same kind of work as the tilting adapter. The fully rotating adapter makes it possible to turn the attachment fully upside down. This can be helpful in levelling work.
Page 124 Working with attachments Avant 645i 650i...
Page 125: Storage, Transport, Tie Down And Lifting
Avant 645i 650i Storage, Transport, Tie down and Lifting Storage, Transport, Tie down and Lifting Before transporting or lifting the loader: Tie down points  Mount the articulation frame lock, see page 135 The loader must be tied down securely if transporting it ...
Page 126 Transport cover To protect the loader during transport, transport cover Risk of loss of control of towing is available. Contact your Avant dealer. vehicle - Never load trailer so that there is lifting force on the tow bar. Trailer must never be loaded so that the center of gravity is behind the axle of the trailer.
Page 127 Avant 645i 650i Storage, Transport, Tie down and Lifting Tie down options Optional equipment for frequent trailer transport If transporting the loader frequently on a trailer, optional tie down brackets are available for easier securing of load. Tie down bracket A418623 installed at the rear...
Page 128: Storage
Eyelets on extra trouble-free use of the loader. side counterweights  It is recommended to have the periodic service installing or removing the side made before storage. Contact Avant service. counterweight only. Never attempt  Clean the loader carefully. lift loader from ...
Page 129: Lifting Of The Loader
Avant 645i 650i Storage, Transport, Tie down and Lifting Lifting of the loader The following picture shows the principle of lifting a loader with the ROPS frame using four lifting straps: Lifting a loader with ROPS: When lifting a loader...
Page 130 Storage, Transport, Tie down and Lifting Avant 645i 650i...
Page 131: Service And Maintenance
Before working on the electric system or battery, disconnect the battery.  Contact your Avant dealer or Avant service for spare parts or more information about any service procedure. Risk of burns, cuts, and sprayed oil or dirt - Use...
Page 132 Service and maintenance Avant 645i 650i High-pressure ejection of fluid may penetrate skin and cause serious injuries - Never handle pressurised components. Before handling hydraulic components, make sure that the hydraulic system of the attachment and the loader are completely de-pressurised. Do not hold your hand near a fitting when tightening or opening it, and never use hands to search for leaks.
Page 133: Engine Compartment And Storage Spaces On The Loader
Avant 645i 650i Service and maintenance Risk of burns - Allow loader to WARNING Consider the environment cool before opening covers. The fluids in the machine are Engine parts, exhaust system, and harmful environment. hydraulic parts may be extremely Never allow fluids to leak in the hot after use.
Page 134 Service and maintenance Avant 645i 650i Storage inside cab There are storage areas around the driver's seat and elsewhere in the cab. Place objects so that they will not interfere with controls of the loader and will not block visibility.
Page 135: Installing Of Service Support And Frame Lock
Avant 645i 650i Service and maintenance Installing of service support and frame lock Service support stored at the tip of the boom Installing boom service support: The red service support of the boom lift cylinder is located at the tip of the boom, behind the attachment coupling plate.
Page 136 Service and maintenance Avant 645i 650i The holes for the frame lock bar are on the left side of the loader, below the access step. Slide the hook type end of the bar through a hole on the rear frame of the loader.
Page 137: Daily Inspections And Periodic Service Schedule
Follow the recommended service schedule. Keep records of services made. Contact Avant service if you are unsure about any of the service procedures, or if you need spare parts.
Page 138 Service and maintenance Avant 645i 650i Daily maintenance and inspections  Do a walk-around check of the loader before each working shift. Complete the tasks listed below daily before starting to use the loader and after each 10 working hours.
Page 139: Periodic Service And Maintenance
In addition to the items listed in the daily and weekly inspections, the following service procedures must be completed periodically. Some of the listed service operations require specialized skills, equipment, and knowledge, and they are intended only for professional technicians. Contact your Avant dealer to locate your nearest Avant service. After every 400 hours of use or...
Page 140 Risk of injuries caused by incorrect parts or service - Use only original spare parts WARNING supplied by Avant. Use of wrong parts may cause serious personal injuries related to damage of the loader or premature wear of its components. Always use original Avant...
Page 141: Engine Diesel Particulate Filter (Dpf)
DPF. Ash load can be seen from Risk of fire and burns - Hot the display. If ash load is high, contact Avant service. WARNING exhaust gas. Pay attention to the...
Page 142 Service and maintenance Avant 645i 650i Stages of regeneration process: DPF Soot Symbols User action needed Regeneration method level on the display 0 - 100 % None Automatic Passive regeneration is made automatically and is not Assisted passive regeneration visible to the operator.
Page 143: Daily And Routine Maintenance Procedures
Avant 645i 650i Service and maintenance Daily and routine maintenance procedures Risk of fire or explosion - Handle fuel with care 1. Refueling  Always stop the engine and Check fuel level and fill the tank if necessary. It is allow it to cool before refueling.
Page 144 Check the metal parts for damages.  Do not use the loader if you see damaged, bent, heavily corroded, or deformed metal parts. Contact Avant service for service, if necessary.  Check the condition of the loader after cleaning of the loader. For more instructions about inspecting the metal structures, bolts, and fittings, see sections starting from page 149.
Page 145 Avant 645i 650i Service and maintenance 3. Clean the loader C. Clean the engine compartment Cleanliness of the loader is not only a question of outer Check and clean engine cooling areas, air intake appearance. A dirty machine will run hotter and will areas, and the external surfaces of engine.
Page 146 Service and maintenance Avant 645i 650i To clean the air condition unit condenser, start by D. Clean cooling systems opening the condenser cover from quick lock at the bottom and carefully pull the cover away. Proper cooling is essential. To...
Page 147 Avant 645i 650i Service and maintenance 4. Add grease to the lubricating points Greasing of the pivot points is essential to avoid wear of joints. Lack greasing cause significant damage articulation joint and boom pivots in short period of time.
Page 148 Service and maintenance Avant 645i 650i B. Front frame and telescopic boom Greasing points are listed in the following table. Reference Number of points 1. Articulation joint Left side of loader 2. Steering cylinder Both ends of steering cylinder, near articulation joint 3.
Page 149 All pivot pins must be in good condition and damaged, the machine must be secured in place. taken to Avant service for checking. Make sure that the pivot pins are not worn and It is not allowed to repair the ROPS there is no excessive slack in the joints.
Page 150: Check Wheels
Note that JIC type See the spare parts catalog for information about bolts, fittings are not tightened with torque and fitting will nuts, and washers. Contact Avant service if you are break when tightened too much. unsure of suitable fasteners.
Page 151: Check Hydraulic Oil Level
Do not operate the loader if the attachment locking system pins do not lower down completely. If the locking system do not work correctly contact Avant service. Use the hydraulic locking system periodically even if...
Page 152 Service and maintenance Avant 645i 650i Loosen and remove the screws (2 pcs) from the air recirculation system frame. 1. Target marker. Fill to this Pull the frame mark when hydraulic and filter housing system is cold. away from its slot.
Page 153 Avant 645i 650i Service and maintenance Risk of severe illness from exposure to dust - Never use the loader if the cab air filter is removed. Make sure that a cab air filter is correctly installed to reduce exposure to dust. Consider using a...
Page 154: Engine Related Inspections And Routine Maintenance
- severe engine damage routine maintenance may result. Excessive oil may also cause heavy emissions and thick Avant 645i/650i loaders are equipped with a Kubota exhaust smoke. In case of overfill, diesel engine. Service and maintenance instructions drain some oil from the engine.
Page 155 Avant 645i 650i Service and maintenance The coolant reservoir is located at rear of the engine The main fuel filter and water separator assembly is compartment. There is no cap on the radiator itself. under the engine cover on left side of the engine.
Page 156 Service and maintenance Avant 645i 650i Clean the inner components of the filter housing Risks short-circuit with a damp cloth WARNING exposure to battery acid and Clean the sealing edges of the air filter. lead Before handling Reinstall the filter cartridge and sealing. Ensure...
Page 157 Avant 645i 650i Service and maintenance The battery is sealed and maintenance free, meaning Check electric cables of the loader that it does not need to and cannot be refilled with Check other electric cables and their routing and water or battery acid during its lifetime. Do not attempt fastening.
Page 158: Inspections After Starting The Loader
Avant service partner. The user must not the lubrication points on top of the boom to access to calibration settings of the load control lubricate the slide pads.
Page 159: Periodic Service
Operator's front tires, boom, or structures of Manual. the loader when moving the boom Contact your Avant dealer to locate your nearest Avant or tilting to the extreme positions. service. Use any attachment only for its intended use.
Page 160: Change Engine Oil Filter
Mobil SHC™ Hydraulic EAL biodegradable mineral oil based hydraulic oil Check the label on the loader for information which oil has been added in factory. If ambient temperature is hot, higher viscosity oil may be required. Contact your Avant dealer or authorised service.
Page 161: Change Fuel Filters
Avant 645i 650i Service and maintenance Hydraulic oil pressure filter: Service only when engine is cold. Replace fuel filters carefully to avoid fuel spill. Make sure to keep all parts  Hydraulic oil pressure filter (1) is located on the top clean during service.
Page 162 Service and maintenance Avant 645i 650i The battery is sealed and maintenance free, meaning 9. Clean fuel tank that it does not need to and cannot be refilled with water or battery acid during its lifetime. Do not attempt Drain and clean the fuel tank annually. If you refuel the to open the cover of the battery.
Page 163 Measure hydraulic pressure of the boom and auxiliary hydraulics annually using the multiconnector pressure gauge adapter. Avant service will measure pressure of the hydrostatic drive system only when low pressure or poor drive performance is suspected. The hydrostatic drive pressure measurement procedure includes checks of other drive pump settings as well.
Page 164 If you suspect that the pulling force of the loader has decreased contact your nearest Avant A hydraulic pump that is integrated in the housing of service. Also the power control valve, the hydraulic...
Page 165 Avant 645i 650i Service and maintenance Check and adjust slide pads of Slide pads 3 and 4 telescopic boom, replace if necessary Slide pads 3 and 4 at the upper end of the inner boom last long The telescopic boom is equipped with replaceable in normal use.
Page 166 Check the ROPS and FOPS structures for visible and corrected as soon as it has been noticed. Contact damages. If ROPS or FOPS is damaged, they your Avant service if you suspect abnormal engine must be replaced with new ones. vibration or noise.
Page 167  these actions are made in early stages. Contact Avant Check the emergency window hammer and its service if there is play in the articulation joint. markings. Make sure a hammer is available and usable for emergency situations.
Page 168 If you operate the the following service packages from your dealer. To loader frequently in dusty conditions change the filter order parts please contact your Avant dealer or more often. For example, if you use the loader for authorised service.
Page 169: Electric System & Fuses
Drive speed range selection again. The electric cables or other electric parts may switch (Avant 650i) be damaged causing a risk of fire. Contact Avant service. 12 V outlet If any of fuse or relay needs to be replaced, make sure to always use correct type of spare parts.
Page 170 Remove the battery completely to the boom. The number and function of installed from the loader. Then contact authorized Avant service relays depends on installed options and equipment on for thorough inspection of the electric systems of the the loader.
Page 171 Avant 645i 650i Service and maintenance Press the test button (2). LED11 (1) is green Vehicle Power Distribution Unit when the main fuse is intact and the PDU receives electric supply. An electric power distribution unit (PDU) is located at the right side of the engine compartment.
Page 172: Jump Start And Auxiliary Power
Service and maintenance Avant 645i 650i Hazardous high voltage. Turn the Jump start and auxiliary power WARNING main connector switch to the OFF The engine can be started with auxiliary power if position if it is necessary to clean necessary, by using appropriate jump start cables that or check the ECU or its harness or have large conductor cross section.
Page 173 Avant 645i 650i Service and maintenance Risk of uncontrolled movement WARNING and contact with moving or hot Risk of electric shock, sparks, parts, sparks fire, CAUTION fire, and burns - Always use engine damage - Never bypass good quality jump start cables...
Page 174: Limp Home Mode
Service and maintenance Avant 645i 650i The system asks for confirmation to activate the Limp home mode limp home mode. Activate the mode with confirmation button (2) only if the loader cannot If the control system of the loader has encountered an be recovered by other means.
Page 175 Avant 645i 650i...
Page 176: Troubleshooting
Engine does not crank Check fuses. If fuse blows again, find out the cause. Contact Avant service. Fuse F11 in PDU is for starter coil. Fuse is blown Also check the main fuse that is installed in the battery cables.
Page 177 Incorrect calibration can prevent movements of the boom. Calibration of load control Contact your nearest Avant service for calibration of the load system is not made correctly Boom does not move control system.
Page 178 Seat belt is not fastened seat belt must be fastened. Unfasten the seat belt and fasten it again. Bad connection on the wiring of Check wires, fuse, and switch, repair if necessary. Contact Avant the parking brake switch, blown service. fuse, or faulty switch...
Page 179 Avant 645i 650i Troubleshooting...
Page 180 Troubleshooting Avant 645i 650i...
Page 181: Maintenance Log
Avant 645i 650i Maintenance log Maintenance log 1. Customer 2. Loader model Serial number 3. Date of delivery Date of service Operating Serviced by: Remarks mm / dd / yyyy hours Stamp/signature _____/ 50 h ___/___/_____ _____/ 450 h ___/___/_____...
Page 182 Maintenance log Avant 645i 650i Notes...
Page 183 Avant 645i 650i Maintenance log Notes...
Page 184: Index
Avant 645i 650i Index Change fuel filters • 161, 176 Check water separator • 72, Change hydraulic oil • 160 Check wheels • 150 Change hydraulic oil filters • Clean fuel tank • 162 1 and 2 pump setting • 82...
Page 185 Avant 645i 650i Drive speed range selection General safety instructions • Light control switch (road switch • 67, 72, 107 traffic light kit) • 66, 95 Lights • 94 Limp home mode • 105, 174, Electric 12 V outlet • 66, 84 Hand throttle lever •...
Page 186 Avant 645i 650i Snow chains • 52 Starting the loader • 102 Parking brake switch • 67, 79 Use only clean fuel • 143 Steering of the loader • 111 Periodic service • 159 Using the auxiliary hydraulics Stopping the engine (Safe •...
Page 187 Avant 645i 650i 645i/650i EC DECLARATION OF CONFORMITY Manufacturer: Avant Tecno Oy Ylötie 1, 33470 Ylöjärvi, Finland Technical Construction File Location: Same as Manufacturer We hereby declare that the machine detailed in this document conforms to the following EC Directives...
Page 188 1450 E . Algonquin R d. Arlington Heights, IL 60005 sales@ avattecnousa.com WWW.AVANTTECNOUSA.COM Tel: 847 380 9822 AVANT has a policy of continuous development, and retains the right to change specifications without notice. © 2025 Avant Tecno Oy. All rights reserved.

This manual is also suitable for:

650i