Kubota RT100-2, and RT105T-2 Service Manual — TOB-0087829

About this manual

Kubota published this Service Manual for RT100-2 and RT105T-2. It is intended for maintenance, source-supported service, and source-supported repair, where those subjects appear in the source publication.

Use the Manual Contents below to check that the exact maintenance, inspection, service, or repair procedure you need is included in this publication.

Manual details

Manufacturer

Kubota

Manual type

Service Manual

Models

RT100-2 and RT105T-2

Document number

TOB-0087829

Publication year

2023

Language

English

Page count

223

Product highlights

Electrical systems

The manual includes wiring diagrams and electrical troubleshooting.

Hydraulic systems

The manual includes hydraulic circuit diagrams and hydraulic pressure-test material.

Specifications and settings

The manual includes reference information for pressure specifications.

Special tools

A special-tools section is included.

Maintenance

The manual includes a maintenance schedule and a lubrication chart.

Manual contents

Use these source headings to locate the task or system you need in the PDF.

• Preface — p. 3
  • Language — p. 3
  • Related documents — p. 4
  • OEM documentation overview — p. 4
  • Icons and signal words used in the document — p. 5
  • Tools — p. 5
  • Illustrations — p. 6
  • Version history — p. 6
  • Typographical conventions — p. 6
  • Abbreviations — p. 7
  • Terminology — p. 8
• 1 Safety — p. 15
  • 1.1 Service-related safety instructions — p. 15
    • 1.1.1 General safety instructions — p. 15
    • 1.1.2 Safety instructions for service below the lifting arm — p. 15
    • 1.1.3 Safety instructions for service on the transmission — p. 15
  • 1.2 Approved trainer — p. 16
  • 1.3 Approved service engineer — p. 16
• 2 Description — p. 17
  • 2.1 Engine — p. 17
    • 2.1.1 Overview — p. 17
    • 2.1.2 Lubrication system — p. 18
    • 2.1.3 Fuel injection system — p. 19
    • 2.1.4 Cooling system — p. 20
    • 2.1.5 Stop solenoid — p. 20
    • 2.1.6 Fuel feed pump — p. 20
    • 2.1.7 Engine oil filter — p. 21
  • 2.2 Electrical system — p. 22
    • 2.2.1 Schematic overview — p. 22
    • 2.2.2 Electrical diagram — p. 22
    • 2.2.3 Fuses and relays — p. 23
    • 2.2.4 Ground connections — p. 25
  • 2.3 Hydraulic system — p. 26
    • 2.3.1 Hydraulic diagram — p. 26
    • 2.3.2 Overview of the drive hydraulics — p. 26
    • 2.3.3 Overview of the steering hydraulics — p. 27
    • 2.3.4 Overview of the work hydraulics — p. 28
    • 2.3.5 Drive pump — p. 29
    • 2.3.6 Work pump — p. 30
    • 2.3.7 Wheel motors — p. 30
    • 2.3.8 Main control valve — p. 31
    • 2.3.9 Lift cylinder — p. 32
    • 2.3.10 Tilt cylinder — p. 32
    • 2.3.11 Steering cylinder — p. 33
    • 2.3.12 Hydraulic steering unit (incl. priority valve) — p. 33
    • 2.3.13 Attachment lock cylinder — p. 35
    • 2.3.14 Valve manifold — p. 36
    • 2.3.15 6/2-diverter valve (If applicable) — p. 37
  • 2.4 Transmission and wheels — p. 37
    • 2.4.1 Overview — p. 37
    • 2.4.2 Inching system — p. 38
  • 2.5 Frame — p. 39
    • 2.5.1 Sliding plates overview — p. 39
• 3 Maintenance — p. 41
  • 3.1 General maintenance instructions — p. 41
  • 3.2 Performing a test drive — p. 42
  • 3.3 Ordering parts — p. 42
  • 3.4 Servicing below the lifting arm — p. 42
    • 3.4.1 Installing the safety bracket on the RT100-2/RT105T-2 — p. 42
    • 3.4.2 Storing the safety bracket on the RT100-2/RT105T-2 — p. 43
  • 3.5 Accessing parts — p. 44
    • 3.5.1 Accessing the wire harness and frame drive hydraulics area — p. 44
    • 3.5.2 Tilting the driver's seat — p. 45
    • 3.5.3 Accessing the work hydraulics (bottom) — p. 45
    • 3.5.4 Accessing the steering unit — p. 46
    • 3.5.5 Accessing the drive pump — p. 46
    • 3.5.6 Accessing the battery — p. 47
  • 3.6 Panolin synthetic hydraulic oil (If applicable) — p. 47
    • 3.6.1 Requirements — p. 48
    • 3.6.2 Sample method — p. 48
    • 3.6.3 Test intervals — p. 49
  • 3.7 Maintenance schedules — p. 49
    • 3.7.1 Maintenance: quick reference — p. 49
    • 3.7.2 Maintenance before delivery — p. 51
    • 3.7.3 Maintenance after the first 50 hours — p. 54
    • 3.7.4 Maintenance every 250 hours — p. 55
    • 3.7.5 Maintenance every 500 hours — p. 56
    • 3.7.6 Maintenance every 1000 hours — p. 57
    • 3.7.7 Maintenance every 1500 hours — p. 58
    • 3.7.8 Maintenance every 3000 hours — p. 58
    • 3.7.9 Maintenance every 1 year — p. 58
    • 3.7.10 Maintenance every 2 years — p. 60
    • 3.7.11 Maintenance every 6 years after hydraulic hose production date — p. 60
  • 3.8 Maintenance tasks — p. 61
    • 3.8.1 Engine — p. 61
    • 3.8.2 Cooling system — p. 62
    • 3.8.3 Fuel system — p. 62
    • 3.8.4 Hydraulic system — p. 63
    • 3.8.5 Electrical system — p. 64
    • 3.8.6 Cabin and controls — p. 64
    • 3.8.7 Transmission and wheels — p. 65
    • 3.8.8 Frame — p. 66
      • 3.8.8.1 Lubrication schedule lifting arm — p. 66
• 4 Checks, cleaning and functional tests — p. 67
  • 4.1 Cabin and controls — p. 67
    • 4.1.1 Checking the ROPS-FOPS structure — p. 67
    • 4.1.2 Testing the steering system — p. 67
    • 4.1.3 Checking the steering wheel — p. 67
    • 4.1.4 Testing the steering column — p. 67
    • 4.1.5 Checking the steering column lock — p. 68
    • 4.1.6 Testing the driver's seat — p. 68
    • 4.1.7 Testing the rotating beacon (If applicable) — p. 68
    • 4.1.8 Checking OPM (operator manual) presence — p. 68
  • 4.2 Engine, cooling and fuel system — p. 68
    • 4.2.1 Testing the stop solenoid — p. 68
    • 4.2.2 Cleaning the main air filter and the safety air filter — p. 68
      • 4.2.2.1 Removing the main air filter (and safety air filter) — p. 69
      • 4.2.2.2 Cleaning and inspecting the main air filter (and safety air filter) — p. 69
      • 4.2.2.3 Installing the main air filter, safety air filter and cover — p. 70
    • 4.2.3 Checking the exhaust system — p. 71
    • 4.2.4 Checking the fuel hoses — p. 72
    • 4.2.5 Checking the V-belt — p. 72
    • 4.2.6 Checking the cable connectors — p. 73
    • 4.2.7 Checking the vibration dampers — p. 73
  • 4.3 Electrical system — p. 74
    • 4.3.1 Checking the electrical wiring — p. 74
    • 4.3.2 Checking the fastening of the engine starter — p. 74
  • 4.4 Hydraulic system — p. 75
    • 4.4.1 Checking the hydraulic cylinders scraper — p. 75
    • 4.4.2 Testing the cylinder seals — p. 75
    • 4.4.3 Testing the lifting arm displacements — p. 76
  • 4.5 Transmission and wheels — p. 77
    • 4.5.1 Testing the parking brake — p. 77
  • 4.6 Frame — p. 77
    • 4.6.1 Checking the paintwork — p. 77
    • 4.6.2 Checking the attachment lock position — p. 77
    • 4.6.3 Checking the hinge pin bolts and spring pins — p. 78
    • 4.6.4 Lubrication procedures telescopic lifting arm — p. 79
• 5 Measurements — p. 81
  • 5.1 Cabin and controls — p. 81
    • 5.1.1 Measuring the front automotive lights inclination — p. 81
  • 5.2 Engine, cooling and fuel system — p. 81
    • 5.2.1 Measuring the coolant freezing point — p. 81
    • 5.2.2 Measuring the valve clearance — p. 82
    • 5.2.3 Measuring the V-belt tension — p. 82
    • 5.2.4 Measuring the glow plugs continuity — p. 82
    • 5.2.5 Measuring the idle speed — p. 82
    • 5.2.6 Measuring the thermostat valve opening temperature — p. 82
  • 5.3 Electrical system — p. 83
    • 5.3.1 Measuring the battery voltage — p. 83
    • 5.3.2 Measuring the alternator supply voltage — p. 84
  • 5.4 Hydraulic system — p. 85
    • 5.4.1 Measuring the drive pump boost pressure — p. 85
    • 5.4.2 Measuring the drive pump forward pressure — p. 86
    • 5.4.3 Measuring the drive pump reverse pressure — p. 87
    • 5.4.4 Measuring the main work pressure — p. 88
      • 5.4.4.1 Measuring the main work pressure (With pressure gauge) — p. 88
    • 5.4.5 Measuring the steering pressure — p. 89
  • 5.5 Frame — p. 90
    • 5.5.1 Telescopic lifting arm — p. 90
      • 5.5.1.1 Sliding plates clearance (Front: top, left and right) — p. 90
      • 5.5.1.2 Sliding plates clearance (Rear: bottom) — p. 90
• 6 Adjustments — p. 93
  • 6.1 Cabin and controls — p. 93
    • 6.1.1 Adjusting the front automotive lights inclination — p. 93
  • 6.2 Engine, cooling and fuel system — p. 94
    • 6.2.1 Bleeding the fuel system — p. 94
    • 6.2.2 Draining the fuel tank — p. 95
    • 6.2.3 Adjusting the valve clearance — p. 95
    • 6.2.4 Adjusting the V-belt tension — p. 95
    • 6.2.5 Adjusting the idle speed — p. 96
  • 6.3 Electrical system — p. 96
    • 6.3.1 Charging the battery — p. 96
  • 6.4 Hydraulic system — p. 97
    • 6.4.1 Adjusting the drive pump boost pressure — p. 97
    • 6.4.2 Adjusting the main work pressure — p. 98
    • 6.4.3 Adjusting the tilt cylinder load-holding valve — p. 99
    • 6.4.4 Adjusting the lift cylinder load-holding valve — p. 100
  • 6.5 Frame — p. 100
    • 6.5.1 Adjusting sliding plates (Front) — p. 100
    • 6.5.2 Adjusting sliding plates (Rear) — p. 101
• 7 Replacements — p. 103
  • 7.1 Cabin and controls — p. 103
    • 7.1.1 Replacing the safety roof — p. 103
    • 7.1.2 Replacing the steering wheel — p. 105
    • 7.1.3 Replacing the dashboard unit — p. 106
    • 7.1.4 Replacing the steering column — p. 107
    • 7.1.5 Replacing the foot plate — p. 108
    • 7.1.6 Replacing the driver's seat — p. 110
    • 7.1.7 Replacing the joystick — p. 111
  • 7.2 Engine, cooling and fuel system — p. 112
    • 7.2.1 Replacing the engine oil — p. 112
    • 7.2.2 Replacing the engine oil filter — p. 114
    • 7.2.3 Replacing the fuel pre-filter — p. 115
    • 7.2.4 Replacing the fuel filters — p. 116
    • 7.2.5 Replacing the fuel sensor — p. 117
    • 7.2.6 Replacing the main air filter and the safety air filter — p. 117
    • 7.2.7 Replacing the complete air filter unit — p. 118
    • 7.2.8 Replacing the coolant — p. 120
      • 7.2.8.1 Antifreeze — p. 123
    • 7.2.9 Replacing parts of the cooling system — p. 124
    • 7.2.10 Replacing the combination cooler — p. 125
    • 7.2.11 Replacing the V-belt — p. 130
    • 7.2.12 Replacing the glow plug — p. 130
    • 7.2.13 Replacing the vibration damper — p. 132
    • 7.2.14 Replacing the fuel hoses — p. 132
    • 7.2.15 Replacing the fuel feed pump — p. 133
    • 7.2.16 Replacing the thermostat — p. 134
    • 7.2.17 Replacing the pressure-relief valve of the combination cooler — p. 134
    • 7.2.18 Replacing the combustion engine — p. 134
    • 7.2.19 Replacing the impeller — p. 135
    • 7.2.20 Replacing the stop solenoid — p. 135
    • 7.2.21 Replacing the starter motor — p. 136
  • 7.3 Electrical system — p. 136
    • 7.3.1 Replacing the battery — p. 136
    • 7.3.2 Replacing the battery switch — p. 139
    • 7.3.3 Replacing the alternator — p. 139
  • 7.4 Hydraulic system — p. 140
    • 7.4.1 Replacing the hydraulic oil — p. 140
      • 7.4.1.1 Draining the hydraulic oil tank — p. 140
      • 7.4.1.2 Filling the hydraulic oil tank — p. 141
    • 7.4.2 Replacing the complete hydraulic filter — p. 141
    • 7.4.3 Replacing the hydraulic suction filters — p. 142
    • 7.4.4 Replacing the hydraulic oil tank filler cap — p. 144
    • 7.4.5 Replacing the work pump — p. 145
      • 7.4.5.1 Replacing the single gear pump — p. 145
      • 7.4.5.2 Replacing the double gear pump (optional) — p. 146
    • 7.4.6 Replacing the drive pump — p. 147
    • 7.4.7 Replacing the steering unit — p. 148
    • 7.4.8 Replacing the main control valve — p. 149
    • 7.4.9 Replacing the hydraulic hoses — p. 152
    • 7.4.10 Replacing the hydraulic cylinders — p. 153
      • 7.4.10.1 Replacing the lift cylinder — p. 153
      • 7.4.10.2 Replacing the tilt cylinder — p. 155
      • 7.4.10.3 Replacing the steering cylinder — p. 156
      • 7.4.10.4 Replacing the attachment lock cylinder (2/2 valve) — p. 159
    • 7.4.11 Replacing the cylinder seals — p. 160
      • 7.4.11.1 Replacing the lift cylinder seals — p. 160
      • 7.4.11.2 Replacing the tilt cylinder seals — p. 162
      • 7.4.11.3 Replacing the steering cylinder seals — p. 164
    • 7.4.12 Replacing the telescopic cylinder — p. 166
    • 7.4.13 Replacing (parts of) the MCO manifold (If applicable) — p. 167
  • 7.5 Transmission and wheels — p. 168
    • 7.5.1 Replacing the throttle cable — p. 168
    • 7.5.2 Replacing the monolastic elastic clutch — p. 168
    • 7.5.3 Replacing the front wheel motor — p. 170
    • 7.5.4 Replacing the rear wheel motor — p. 173
  • 7.6 Frame — p. 175
    • 7.6.1 Replacing sliding plates (Front) — p. 175
    • 7.6.2 Replacing sliding plates (Rear) — p. 177
    • 7.6.3 Replacing the complete lifting arm — p. 178
      • 7.6.3.1 Replacing the standard lifting arm — p. 178
      • 7.6.3.2 Replacing the telescopic lifting arm — p. 183
    • 7.6.4 Replacing ball joints — p. 195
      • 7.6.4.1 Replacing top ball joint — p. 195
      • 7.6.4.2 Replacing lower ball joint — p. 196
• 8 Troubleshooting — p. 199
  • 8.1 Troubleshooting procedure — p. 199
  • 8.2 Complete machine — p. 199
    • 8.2.1 Troubleshooting table — p. 199
  • 8.3 Engine, cooling and fuel system — p. 199
    • 8.3.1 Troubleshooting table — p. 199
  • 8.4 Cabin and controls — p. 200
    • 8.4.1 Troubleshooting table — p. 200
  • 8.5 Electrical system — p. 200
    • 8.5.1 Troubleshooting table — p. 200
  • 8.6 Hydraulic system — p. 201
    • 8.6.1 Troubleshooting table — p. 201
    • 8.6.2 Forward or reverse drive pressure incorrect — p. 202
    • 8.6.3 Telescopic/Tilt cylinder displacement outside of specifications — p. 203
    • 8.6.4 Lift cylinder displacement outside of specifications — p. 204
• 9 Technical Data — p. 205
  • 9.1 Consumables — p. 205
    • 9.1.1 Fluid specifications — p. 205
  • 9.2 Torque specifications — p. 205
    • 9.2.1 Torque specifications of fasteners — p. 205
    • 9.2.2 Torque specifications of special fasteners — p. 206
  • 9.3 Clearance specifications — p. 206
  • 9.4 Paint specifications — p. 206
  • 9.5 Non-Destructive Testing (NDT) inspection standards — p. 207
  • 9.6 Wear specifications — p. 207
  • 9.7 Pressure specifications — p. 207
  • 9.8 Other specifications — p. 207
  • 9.9 Special tools specifications — p. 208
• 10 OEM Documentation — p. 209
  • 10.1 Checks, cleaning and functional tests — p. 209
    • 10.1.1 Test stop solenoid — p. 209
    • 10.1.2 Check V-belt — p. 210
  • 10.2 Measurements and adjustments — p. 211
    • 10.2.1 Measuring and adjusting the valve clearance — p. 211
    • 10.2.2 Measuring and adjusting the V-belt tension — p. 213
    • 10.2.3 Measuring the glow plugs continuity — p. 213
    • 10.2.4 Measuring the thermostat opening temperature — p. 214
    • 10.2.5 Measuring the alternator supply voltage — p. 214
  • 10.3 Replacements — p. 215
    • 10.3.1 Replacing the V-belt — p. 215
    • 10.3.2 Replacing the thermostat — p. 216
  • 10.4 OEM Troubleshooting — p. 216
    • 10.4.1 Electric — p. 216
      • 10.4.1.1 Bearing — p. 217
      • 10.4.1.2 Stator — p. 217
      • 10.4.1.3 Rotor — p. 218
      • 10.4.1.4 Slip ring — p. 219
      • 10.4.1.5 Brush wear — p. 220
      • 10.4.1.6 Rectifier — p. 221
      • 10.4.1.7 IC-regulator — p. 221

Capabilities

The source outline indexes servicing instructions, maintenance, checking and adjustment, inspection, replacement procedures, and troubleshooting. Use these source-backed headings to locate the applicable service or repair topic in the source PDF, then confirm model-specific notes, specifications, illustrations, and operating conditions at the relevant page before carrying out service or repair work.

Keep the source's safety sequence, prerequisite steps, labels, units, configuration notes, and footnotes with the selected task; do not apply an isolated value outside the conditions stated in the manual.

Technical reference

Reference tables include pressure specifications for service specifications, limits, adjustment and repair reference data. Use the values and conditions in the PDF for the applicable model and procedure.

• Pressure reference: pressure specifications.

Delivery

This manual is supplied as a digital PDF file and is available for instant download after purchase. No physical media is shipped.

References

Kubota Service Manual for Wheel Loader, document code TOB-0087829, PDF edition.