Description
Kubota RT250-2 RT260-2 Wheel Loader Service Manual
RT250-2 RT260-2 Contents:
Preface……………………………………………………………………………………………………………………………..3
Language…………………………………………………………………………………………………………………………………… 3
Related documents………………………………………………………………………………………………………………………4
OEM documentation overview……………………………………………………………………………………………………… 4
Icons and signal words used in the document………………………………………………………………………………..5
Tools…………………………………………………………………………………………………………………………………………..5
Illustrations………………………………………………………………………………………………………………………………….6
Version history……………………………………………………………………………………………………………………………. 6
Typographical conventions…………………………………………………………………………………………………………… 7
Abbreviations……………………………………………………………………………………………………………………………… 7
Terminology…………………………………………………………………………………………………………………………………8
1 Safety…………………………………………………………………………………………………………………………. 15
1.1 Service-related safety instructions…………………………………………………………………………………………. 15
1.1.1 General safety instructions…………………………………………………………………………………………….15
1.1.2 Safety instructions for service on the transmission……………………………………………………………15
1.1.3 Safety instructions for service below the lifting arm…………………………………………………………..15
1.2 Approved trainer…………………………………………………………………………………………………………………..16
1.3 Approved service engineer…………………………………………………………………………………………………… 16
2 Description…………………………………………………………………………………………………………………. 17
2.1 Engine……………………………………………………………………………………………………………………………….. 17
2.1.1 Overview…………………………………………………………………………………………………………………….. 17
2.1.2 Lubrication system………………………………………………………………………………………………………..18
2.1.3 Cooling system……………………………………………………………………………………………………………. 19
2.2 Electrical system…………………………………………………………………………………………………………………. 19
2.2.1 Schematic overview………………………………………………………………………………………………………19
2.2.2 Electrical diagram………………………………………………………………………………………………………… 20
2.2.3 Fuses and relays…………………………………………………………………………………………………………. 20
2.2.3.1 Fuses in steering column……………………………………………………………………………………….21
2.2.3.2 Fuses in dashboard……………………………………………………………………………………………… 21
2.2.3.3 Fuses in driver’s seat…………………………………………………………………………………………….22
2.2.4 Ground and power connections…………………………………………………………………………………….. 22
2.3 Hydraulic system………………………………………………………………………………………………………………….24
2.3.1 Hydraulic diagram…………………………………………………………………………………………………………24
2.3.2 Overview of the drive hydraulics…………………………………………………………………………………….25
2.3.3 Overview of the steering hydraulics……………………………………………………………………………….. 26
2.3.4 Overview of the work hydraulics……………………………………………………………………………………. 27
2.3.5 Drive pump…………………………………………………………………………………………………………………. 28
2.3.6 Drive motor…………………………………………………………………………………………………………………. 28
2.3.7 Work pump…………………………………………………………………………………………………………………. 29
2.3.8 Fuel feed pump…………………………………………………………………………………………………………… 29
2.3.9 Fuel supply pump………………………………………………………………………………………………………… 30
2.3.10 Main control valve……………………………………………………………………………………………………… 30
2.3.11 Hydraulic cylinders………………………………………………………………………………………………………33
2.3.12 Steering cylinder………………………………………………………………………………………………………… 33
2.3.13 Steering unit and priority valve……………………………………………………………………………………. 33
2.3.14 Attachment lock cylinder…………………………………………………………………………………………….. 35
2.3.15 6/2-diverter valve (If applicable)…………………………………………………………………………………… 36
2.4 Transmission and wheels…………………………………………………………………………………………………….. 37
3 Maintenance……………………………………………………………………………………………………………….. 41
3.1 General maintenance instructions…………………………………………………………………………………………. 41
3.2 Performing a test drive………………………………………………………………………………………………………… 42
3.3 Ordering parts…………………………………………………………………………………………………………………….. 42
3.4 Servicing below the lifting arm……………………………………………………………………………………………… 42
3.4.1 Installing the safety bracket on the RT250-2/RT260-2……………………………………………………….42
3.4.2 Storing the safety bracket on the RT250-2/RT260-2………………………………………………………… 43
3.5 Accessing parts……………………………………………………………………………………………………………………44
3.5.1 Opening the bonnet………………………………………………………………………………………………………44
3.5.2 Accessing the work hydraulics (top side)…………………………………………………………………………44
3.5.3 Accessing the steering unit…………………………………………………………………………………………… 44
3.5.4 Accessing the brakes…………………………………………………………………………………………………… 45
3.5.5 Tilting the cabin/canopy…………………………………………………………………………………………………46
3.6 Panolin synthetic hydraulic oil (If applicable)………………………………………………………………………….. 48
3.6.1 Requirements……………………………………………………………………………………………………………….48
3.6.2 Sample method…………………………………………………………………………………………………………….48
3.6.3 Test intervals………………………………………………………………………………………………………………..49
3.7 Maintenance schedule…………………………………………………………………………………………………………. 49
3.7.1 Maintenance: quick reference……………………………………………………………………………………….. 49
3.7.2 Maintenance before delivery…………………………………………………………………………………………. 52
3.7.3 Maintenance after the first 50 hours………………………………………………………………………………. 55
3.7.4 Maintenance after every 250 hours……………………………………………………………………………….. 57
3.7.5 Maintenance every 500 hours………………………………………………………………………………………..58
3.7.6 Maintenance every 1000 hours………………………………………………………………………………………59
3.7.7 Maintenance every 1500 hours………………………………………………………………………………………60
3.7.8 Maintenance every 3000 hours………………………………………………………………………………………61
3.7.9 Maintenance every 1 year……………………………………………………………………………………………..61
3.7.10 Maintenance every 2 years…………………………………………………………………………………………. 63
3.8 Maintenance tasks………………………………………………………………………………………………………………. 63
3.8.1 Engine………………………………………………………………………………………………………………………… 63
3.8.2 Cooling system……………………………………………………………………………………………………………. 65
3.8.3 Fuel system………………………………………………………………………………………………………………… 65
3.8.4 Hydraulic system…………………………………………………………………………………………………………. 65
3.8.5 Electrical system…………………………………………………………………………………………………………..67
3.8.6 Cabin and controls………………………………………………………………………………………………………. 67
3.8.7 Transmission and wheels……………………………………………………………………………………………… 68
3.8.8 Frame………………………………………………………………………………………………………………………….70
4 Checks, cleaning and functional tests………………………………………………………………………….71
4.1 Cabin and controls……………………………………………………………………………………………………………….71
4.1.1 Checking the ROPS-FOPS structure……………………………………………………………………………… 71
4.1.2 Checking the windscreen wiper blades (If applicable)………………………………………………………. 72
4.1.3 Testing the steering system……………………………………………………………………………………………72
4.1.4 Checking the steering wheel…………………………………………………………………………………………. 72
4.1.5 Testing the steering column………………………………………………………………………………………….. 72
4.1.6 Checking the steering column lock………………………………………………………………………………… 72
4.1.7 Testing the radio (If applicable)………………………………………………………………………………………73
4.1.8 Testing the driver’s seat……………………………………………………………………………………………….. 73
4.1.9 Testing the 12-V connection (If applicable)………………………………………………………………………73
