Part of the Kubota Repair Manuals.
This Kubota KC120HC Workshop Manual (OEM #RY911-20880) stays on one machine: the KC120HC crawler dumper, with its Z482-E3B diesel, HST hydrostatic drive, and hydraulic bed-tipping circuit. Hydraulic schematics are included, the first mapping the HST drive circuit and its pump, motor, charge pump, and high- and low-pressure relief valves, the second tracing dumping-circuit flow through the pull-down and push-up ports. A full wiring diagram runs every circuit from the glow timer to the oil-pressure alarm. Rounding it out are exploded views of the drivetrain and undercarriage plus troubleshooting charts for hard-start, no-drive, and steering faults. Reference figures sit right where you need them: fill the HST tank to 13.0 L, the engine to 2.55 L, and torque M10 bolts to 39.2-45.1 N·m. Bookmarked throughout, and it opens straight to the machine on your phone.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine | See the WSM / Diesel Engine Sm-E3B Series, Model, Number of Cylinders, Type, BorexStroke | |
| Transmission | Power Train, Gearing, Engrenages, Gear Ratio, Rapport D'Engrenage, HST, Hight (H) | |
| Hydraulic System (HST) | HST Unit, Hydraulic Pump, Hydraulic Motor, Charge Pump, Relief Valve Set Pressure, Charge Pressure, Pressure Check Port (Pf3/8), Suction Port (Pf1/2) [Charge Pump] | |
| Hydraulic System (Dumping) | Hydraulic Pump, Discharge Volume, Revolution, Relief Valve Set Pressure, Tank Capacity, Pulley Size (Pump), Pulley Size (Engine) | |
| Fuel System | Fuel Hose (Fuel Tank ~ Fuel Filter), Fuel Hose (Fuel Filter ~ Injection Pump), Fuel Hose (Nozzle Holder ~ Fuel Tank) | |
| V-Belt | V-Belt (Engine Pulley ~ HST Pulley), V-Belt (Engine Pulley ~ Hydraulic Pump Pulley), Engine Pulley, HST Pulley | |
| Wiring Diagram | Cord Color, Starter, Safety Switch, Glow Plug, Alternator, Regulator, Alarm Lamp "Battery Charge" | |
| Tightening Torque | General Bolts and Nuts, Crawler Adjusting Bolt, Hose Adapter for Hydraulic Pump, Transmission, Brake Case [Bolt], Brake Case Cover [Bolt], Transmission Case [Nut], Axle Pipe [Bolt] | |
| Oils and Fuel | Transmission Oil, Hydraulic Pump Oil, HST Oil, Engine Oil, Fuel | |
| Greasing | Cylinder Lower, Cylinder Upper, Deck Body Support Fulcrum, Opening/Closing Kit (Right & Left), Lower Roller, Upper Roller, Idler, Bogie Roller | |
| Caution for Disassembling and Reassembling | Sprocket, Adjusting Bolt for Crawler, Bolts for Frame (Upper / Under), Angle of Drain Port (HST Unit), Dust Cover for Transmission (Final Shaft), Charge Pump (HST) | |
| Adjustment of Component Parts | Main Clutch Adjustment, Brake Adjustment, Steering Lever Adjustment, Check and Adjustment of Steering Brake, Neutral System Adjustment, Belt Tension Adjustment, Check and Adjustment of Fan Belt Tension, Crawler Adjustment | |
| Testing of Pressure (HST) | HST, Pressure Check Port, Input Shaft, Suction Port, Drain Port, Charge Pump, Discharge Port | |
| Replacement of Wear Out Parts | Friction Plate, Clutch Plate | |
| Troubleshooting and Counter Measures | The Machine Does Not Stop, Even If Remove the Foot From Drive Pedal, The Machine Does Not Drive, The Machine Does Not Drive Powerful, The Operating Force for Steering Lever Is Heavy, The Steering Lever Does Not Return Smoothly, The Speed Change Lever Does Not Move Smoothly | |
| Maintenance Intervals | Every 25 Service Hours, Every 50 Service Hours, Every 100 Service Hours, Every 400 Service Hours, Every 500 Service Hours, Every One or Two Months, Every One Year, Every 800 Service Hours |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Standard Bolt Torque (M10) | 39.2 - 45.1 N.m | p. 22 |
| Machine Weight | 885 kg | p. 5 |
| Engine Oil Capacity | 2.55 L | p. 5 |
| Fuel Tank Capacity | 14.8 L | p. 5 |
| HST Oil Capacity | 13.0 L | p. 5 |
| M10 Standard Bolt Torque | 39.2-45.1 N.m | p. 22 |
| Crawler Adjusting Bolt Torque | 215 ~ 225 kgf·cm | p. 23 |
| Main Clutch Belt Tension | 8 to 10 mm / 5 kgf | p. 39 |
| Brake Pedal Free Travel | 1 mm | p. 40 |
| Fan Belt Tension | 7 to 9 mm (under load of 10 kgf) | p. 44 |
| Crawler Tension Clearance | 25~35 mm | p. 45 |
| Hydraulic Cylinder Pressure | 170 kgf/cm² | p. 17 |
