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 Kubota KC120HC Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine | 8-12 | See The WSM / Diesel Engine SM-E3B Series, Model, Number Of Cylinders, Type, BorexStroke |
| Transmission | 13 | Power Train, Gearing, Engrenages, Gear Ratio, Rapport D'Engrenage, Hst, Hight (H) |
| Hydraulic System (HST) | 14-15 | 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) | 16-17 | Hydraulic Pump, Part No, Discharge Volume, Revolution, Relief Valve Set Pressure, Tank Capacity, Pulley Size (Pump), Pulley Size (Engine) |
| Fuel System | 18 | Fuel Hose (Fuel Tank ~ Fuel Filter), Fuel Hose (Fuel Filter ~ Injection Pump), Fuel Hose (Nozzle Holder ~ Fuel Tank) |
| V-Belt | 19 | V-Belt (Engine Pulley ~ HST Pulley), V-Belt (Engine Pulley ~ Hydraulic Pump Pulley), Engine Pulley, HST Pulley |
| Wiring Diagram | 20-21 | Cord Color, Starter, Safety Switch, Glow Plug, Alternator, Regulator, Alarm Lamp "Battery Charge" |
| Tightening Torque | 22-28 | 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 | 29-33 | Transmission Oil, Hydraulic Pump Oil, Hst Oil, Engine Oil, Fuel |
| Greasing | 34-36 | 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 | 37-38 | 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 | 39-46 | 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) | 47 | HST, Pressure check port, Input shaft, Suction port, Drain port, Charge pump, Discharge port |
| Replacement of Wear Out Parts | 48 | Friction plate, Clutch plate |
| Troubleshooting and Counter Measures | 49-51 | 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 | 52-54 | 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 |
Kubota KC120HC Common Problems This Manual Covers
Kubota KC120HC dumper engine turns over but will not start normally when turning the ignition key p. 49
Check the brake pedal safety switch wiring for breaks and loose connections, then set the brake pedal free travel to exactly 1 mm per page 40.
Manual Section: Troubleshooting and Counter MeasuresMachine continues moving and will not stop driving even after removing your foot from the drive pedal p. 49
Inspect the HST lever bolt for looseness, then torque any standard M10 bolts on the lever assembly to 39.2-45.1 N.m per page 22. If the machine still creeps with the pedal released, adjust the HST neutral system.
Manual Section: Troubleshooting and Counter MeasuresTracked carrier lacks driving power under heavy load and crawler feels excessively tight during operation p. 45
Measure the crawler tension clearance using page 45, then work the track sag down to 25~35 mm. Tighten the crawler adjusting bolt to 215 ~ 225 kgf·cm per the page 23 torque table to bring driving power back.
Manual Section: Adjustment of Component PartsEngine runs fine but transmission feels weak and main clutch belts slip under heavy loads p. 39
Verify the main clutch belt tension. With the cover off, set the V-belts to 8 to 10 mm of deflection under a 5 kgf load, detailed on page 39. Swap the belts out if they show heavy glazing or cracking.
Manual Section: Adjustment of Component PartsFrequently Asked Questions
What are the torque specs for Kubota KC120HC track carrier bolts?
Torque the crawler adjusting bolt (Part no 89954-1205-0) on the Kubota KC120HC to 215 ~ 225 kgf·cm (21.1 N·m ~ 22.1 N·m). You'll find the figure in the tightening torque section.
What do I get after purchasing this Kubota KC120HC manual?
It's a 54-page searchable PDF, ready the moment you check out. Works on any device, so you can pull it up on your phone right at the machine. No shipping, no waiting.
What are the fluid capacities for the Kubota KC120HC?
The KC120HC dumper holds 2.55 L of engine oil and 13.0 L of HST oil, with a 14.8 L fuel tank (page 5). These figures let you order the right amount before a service so you are not guessing at the machine.
Why won't my Kubota KC120HC start even though the engine turns over?
If the engine cranks but will not start, the manual points to the brake pedal safety switch wiring and pedal adjustment. Check the safety switch wiring for breaks and loose connections, then set the brake pedal free travel to exactly 1 mm (page 40). The troubleshooting section walks through this on page 49.
My Kubota KC120HC keeps creeping after I release the drive pedal — how do I fix it?
When the machine keeps moving with your foot off the drive pedal, inspect the HST lever bolt for looseness and torque any standard M10 bolts on the lever assembly to 39.2-45.1 N.m (page 22). If it still creeps, the manual covers adjusting the HST neutral system (page 49).
How do I fix a Kubota KC120HC that lacks driving power and has a tight crawler?
Loss of driving power often comes from an over-tight track. Measure the crawler tension clearance and work the track sag down to 25~35 mm (page 45). The manual covers this adjustment in the Adjustment of Component Parts section.
Are there any print restrictions on this Kubota KC120HC manual?
Yes. Print as many copies as you want; there are no restrictions. Plenty of mechanics print just the section they need and carry it to the shop floor.
Does this Kubota KC120HC manual include hydraulic schematics?
Yes. It carries hydraulic system diagrams, circuit schematics, and component specifications for the KC120HC.
Document Quality
This document is a native digital PDF, allowing you to search and copy the full text content. All text is crisp and easy to read throughout the manual. Diagrams and illustrations are primarily vector graphics, which remain sharp at any zoom level, and their labels are perfectly readable. Some pages include clear raster photos, which are also easy to understand. The pages are clean with no scan artifacts, stains, or skewed content, and there is one blank page at the beginning.
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