Working on a Kubota BX1870, BX2370, or BX2670? This 417-page workshop manual (OEM #9Y111-08554) covers all three tractors, seven RCK mower decks, and the LA front loaders in one file. The hydraulic section runs 22 pages of schematics that trace fluid through the control valve, flow priority valve, and steering cylinder, backed by 10 pages of wiring diagrams for safety switch logic and operator presence control. Disassembly fills 58 pages across engine, transaxle, front axle, hydraulic, mower, loader, and electrical work, with 12 pages of torque tables and 16 pages of troubleshooting charts alongside. Front wheel mounting screws torque to 149.2-179.0 N·m (110-132 lbf·ft); set the anti-scalp rollers 6-13 mm off the ground before you drop the deck. Stop chasing specs across three forums. Everything is bookmarked and keyword-searchable, so you can open it on a tablet and walk straight to the machine.
What's Inside This Kubota BX1870 & variants Manual
| System | Pages | Key Topics |
|---|---|---|
| I Information | 4-26 | - |
| G General | 27-99 | Identification (Tractor Identification, Mower Identification, Front Loader Identification) |
| 1 Engine | 100-173 | Lubricating System, Cooling System, Fuel System, Checking |
| 2 Transaxle | 174-241 | Traveling System (Hydrostatic Transmission, Range Gear Shift Section, Front Wheel Drive Section, Differential Gear Section, Brake Section) |
| 3 Front Axle | 242-260 | Front Wheel Alignment, Structure, Checking |
| 4 Steering | 261-275 | Steering Controller, Steering Cylinder, Hydraulic Circuit, Checking |
| 5 Hydraulic System | 276-318 | Hydraulic Pump, Control Valve, Flow Priority Valve, Relief Valve, Hydraulic Cylinder, Hydraulic Block Type Outlet, Mower Linkage |
| 6 Electrical System | 319-366 | Wiring Diagram, Starting System (Main Switch Position, Safety Switch, Operator Presence Control), Charging System (Electrical Circuit, Ic Regulator), Lighting System |
| 7 Mower | 367-400 | Power Transmission, Lifting Mechanism, Self-Balancer System, Setting Up Mower (Rck48-18Bx, Rck54-23Bx, Rck60B-23Bx, Rck48P-18Bx, and Rck54P-23Bx, Rck54D-26Bx, Rck60D-26Bx) |
| 8 Front Loader | 401-417 | Hydraulic Circuit Schematic, Control Valve Assembly, Boom Cylinder And Bucket Cylinder |
Every system also includes tightening torques, disassembling and servicing, servicing specifications, and troubleshooting.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| BX1870D, BX2370D, BX2670D | ||
| Front wheel mounting screws torque | 149.2 to 179.0 N·m (15.2 to 18.3 kgf·m, 110 to 132 lbf·ft) | p. 54 |
| Rear wheel mounting screws torque | 108.5 to 130.2 N·m (11.1 to 13.3 kgf·m, 80 to 96 lbf·ft) | p. 54 |
| RCK48-18BX | ||
| Mower link clearance (between stopper and rear link) | 0 to 0.5 mm (0 to 0.01 in.) | p. 385 |
| RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX, RCK54P-23BX | ||
| Anti-scalp rollers to ground clearance | 6 to 13 mm (0.25 to 0.5 in.) | p. 386 |
| RCK54D-26BX | ||
| Mower blade screw torque | 103 to 117 N·m (10.5 to 12.0 kgf·m, 76.0 to 86.7 lbf·ft) | p. 375 |
| Gear box mounting screw torque | 78 to 90 N·m (7.9 to 9.2 kgf·m, 58 to 66 lbf·ft) | p. 375 |
| All Models | ||
| Relief valve setting pressure (Oil temperature at 45 to 55 °C (113 to 131 °F)) | 12.3 to 12.7 MPa (125 to 130 kgf/cm², 1780 to 1840 psi) | p. 303 |
| Air cleaner element replacement interval | Every 1000 hours or every 1 year whichever comes first | p. 57 |
| Engine oil filter replacement interval | every 200 Hr | p. 46 |
| Transmission oil filter replacement interval | every 200 Hr | p. 46 |
| Fuel filter element replacement interval | every 400 Hr | p. 46 |
| Radiator screen cleaning interval | Daily | p. 49 |
Kubota BX1870 & variants Common Problems This Manual Covers
Kubota BX2670 engine loses power and runs erratically after 30 minutes of mowing
Check the fuel cap first: loosen it slightly and run the engine again. If power comes back, the tank vent is blocked. Drain the fuel bowl, looking for water or sediment, and replace the fuel filter every 400 hours per page 46. Last, trace the fuel line for kinks or pinch points and run the full fuel-system checklist.
Manual Section: 1 EngineEngine won't start, cranks too slowly or turns over but won't fire
Measure battery voltage first; the factory minimum is 12 V (page 337). Clean any corroded terminals and check the fuses. Make sure the seat, PTO, and brake safety switches are all set correctly, then trace the starting circuit using the wiring diagram on page 321. If the battery tests good and it still won't fire, move to the no-start fuel and injection diagnosis.
Manual Section: 1 EngineTractor overheats under mowing load, temperature gauge climbs into the red p. 100
Clean the radiator screen daily; chaff packs it fast while mowing (page 49). Next, check fan belt deflection mid-span, where the target is 7 to 9 mm (0.28 to 0.34 in.) per page 58, since a slack belt underfeeds the cooling fan. Confirm the coolant level and look over the fan blades for cracks or missing fins. Full cooling system procedures start on page 100.
Manual Section: 1 EngineHydraulic loader boom won't rise or lifts very slowly under a loaded bucket p. 401
Verify the transmission oil level; on the BX1870D, BX2370D, and BX2670D the case holds 11.6 L (3.06 U.S. gals). Swap the hydraulic oil filter at 200-hour intervals (page 46). Pressure-test the relief valve, which should read 12.3 to 12.7 MPa (1780 to 1840 psi) at 45 to 55 degrees C oil temperature per page 303. From there, follow the loader control valve and boom cylinder checks on page 401.
Manual Section: 8 Front LoaderBattery drains overnight, tractor won't crank after sitting a few days
Test battery voltage; the factory spec is more than 12 V (page 337). Scrub corroded terminals and check the fuse links for continuity. A loose fan belt undercharges the system, so inspect it for slipping against the target deflection of 7 to 9 mm (0.28 to 0.34 in.) mid-span (page 58). Finally, trace the alternator output and IC regulator on the wiring diagram, page 321.
Manual Section: 6 Electrical SystemMower blades spin slowly, cut quality drops and strips of uncut grass left behind p. 367
Inspect the mower belt for glazing, cracks, or slip; a worn belt is the usual culprit. Clear grass packed around the spindle housings and confirm the engine is at full throttle before you engage the blades. When reinstalling, torque the blade screws to 103 to 117 N·m (76.0 to 86.7 lbf·ft) per page 375. Power transmission and blade speed procedures begin on page 367.
Manual Section: 7 MowerFrequently Asked Questions
How do I adjust the mower deck on an RCK48/RCK54/RCK60 Kubota mower?
Cutting height is set at the front links. On the RCK54D-26BX and RCK60D-26BX, turn the lock nuts until the blade's front tip sits 0 to 5 mm (0 to 0.2 in.) off its rear tip. On the RCK60B-23BX, RCK54-23BX, RCK48-18BX, RCK54P-23BX, and RCK48P-18BX, adjust the same links until the "L" minus "R" difference is less than 3 mm (0.12 in.).
What is the torque specification for Kubota BX wheel bolts or mower blade bolts?
Front wheel mounting screws take 149.2 to 179.0 N·m (15.2 to 18.3 kgf·m, 110 to 132 lbf·ft), and the rear wheel screws take 108.5 to 130.2 N·m (11.1 to 13.3 kgf·m, 80 to 96 lbf·ft). Blade screws on the RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX, and RCK54P-23BX call for 98.1 to 117 N·m (10.0 to 12.0 kgf·m, 72.4 to 86.7 lbf·ft).
What are the replacement specifications for the air filter primary element?
Replace the air cleaner element every 1000 hours or once a year, whichever comes first, and clean it every 100 hours (sooner in dusty conditions). To clean it, blow compressed air from the inside at under 205 kPa (2.1 kgf/cm2, 30 psi).
What are the replacement specifications for the engine oil filter?
Change the engine oil filter every 200 hours. Wipe a film of clean engine oil onto the new filter's rubber seal, spin it on until it meets the mounting surface, then turn it one half-turn more by hand and stop there.
What format is this Kubota BX1870 & variants manual in?
It is an instant PDF download. The full 417-page searchable Workshop Manual is yours the moment payment clears, ready to open on a laptop, tablet, or phone right in the shop.
Am I able to print pages from this Kubota BX1870 & variants manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are hydraulic system diagrams in this Kubota BX1870 & variants Workshop Manual?
Yes, this Kubota BX1870 & variants Workshop Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
Document Quality
This document is a scanned PDF with an OCR text layer, allowing you to search and copy the full text content. The text is generally crisp and readable throughout, though some very small labels in diagrams may appear slightly less sharp upon close inspection. Diagrams and illustrations are primarily raster images, which maintain good clarity at moderate zoom levels, and their labels are readable. The pages are clean with no noticeable scan artifacts, stains, or skewed content. There are no significant blank or filler pages, only section dividers.
Reviews
There are no reviews yet.