This Kubota BH70 Workshop Manual (OEM #9Y111-13460) runs 69 pages and stays on a single machine: the BH70 backhoe, from identification and service specifications through factory-level disassembly. The hydraulics get 15 pages of circuit diagrams, with the control valve structure and operation broken down next to a dedicated overload relief valve section. Torque data fills 3 pages covering stud bolts, American Standard fasteners, plugs, and hydraulic fittings, and the maintenance checklist lays out daily, 10-hour, and 50-hour check points. Another 12 pages walk through disassembly and assembly, with 2 pages of troubleshooting. Set relief valve pressure between 13.0 and 13.8 MPa, and confirm the boom cylinder extend cycle at 3.4 seconds before you close things up. Skip the forum guesswork and work from the factory numbers. Every page of the Kubota BH70 workshop manual PDF is bookmarked, so you can search a spec by keyword and pull it up right at the machine.
What's Inside This Kubota BH70 Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | 4-14 | Safety First, Safety Decals, Terminology, Specifications |
| General | 15-27 | Identification, Lubricants, Tightening Torques (Stud Bolts, American Standard Screws, Bolts And Nuts With, Plugs, Hydraulic Fittings), Maintenance Check List |
| Mechanism | 28-46 | Hydraulic Circuit, Control Valve (Structure, Operation, Overload Relief Valve), Hydraulic Cylinder |
| Servicing | 47-69 | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling And Servicing (Checking And Adjusting, Disassembling And Assembling) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Control Lever Operating Force | 10 to 15 N (1.0 to 1.5 kgf, 2.3 to 3.3 lbf) | p. 50 |
| Relief Valve Pressure | 13.0 to 13.8 MPa (133 to 140 kgf/cm², 1890 to 2000 psi) | p. 50 |
| Digging force (With bucket cylinder) | 12900 N | p. 12 |
| Boom cylinder, extend cycle time | 3.4 seconds | p. 12 |
| Transmission Case Capacity (B2301, B2601) | 15 L | p. 19 |
| M10 (8.8 Property class) bolt tightening torque | 48 to 55 N-m | p. 20 |
| Sub frame mounting bolt and nut (M16) torque | 176 to 203 N·m | p. 25 |
| Relief Valve Setting Pressure (Dipperstick boom) | 17.20 to 17.69 MPa | p. 44 |
| Boom Cylinder Rod O.D. | 30.0 mm | p. 46 |
| Boom Cylinder Rod Pin to Cylinder Bushing Clearance (Allowable Limit) | 1.0 mm | p. 50 |
| Boom cylinder head tightening torque | 350 to 400 N-m | p. 52 |
| Piston Rod Bend (Allowable Limit) | 0.25 mm | p. 68 |
Kubota BH70 Common Problems This Manual Covers
Kubota BH70 dipper extend arm sluggish, sticks mid-stroke, or won't move at all p. 48
Remove the dipper extend valve spool cap and drain any trapped oil. Oil migrating past the cap seal pressurizes the cavity and hydro-locks the spool in place. After draining, verify the overload relief valve setting is 17.20 to 17.69 MPa per the spec on page 44. If symptoms persist, repair or replace the valve spool as suggested in the troubleshooting steps on page 48 under Individual Cylinder Circuit.
Manual Section: Individual Cylinder Circuit Weak or Inoperative (Others OK)Bucket curl control lever feels loose or sloppy, curl circuit not responding to input p. 50
Inspect the bucket curl control lever linkage for worn pivot pins or excessive play. Operating force at the lever should measure 10 to 15 N (2.3 to 3.3 lbf), as specified on page 50. If force is within spec, check the valve spool for partial sticking or internal wear using the troubleshooting chart on page 48.
Manual Section: Individual Cylinder Circuit Weak or Inoperative (Others OK)All backhoe functions stop working after connecting the unit, front loader still operates normally p. 48
Check the hydraulic pipe joint between tractor and backhoe frame first. A disconnected or loose joint cuts backhoe flow while leaving the loader circuit intact. Torque the sub-frame mounting bolts to 176 to 203 N·m per the spec on page 25, then trace each hydraulic line using the circuit schematic on page 29.
Manual Section: All Functions Inoperative (Front Loader Is OK)Single cylinder noticeably slower than others or stalls when digging into hard ground p. 50
Verify the system relief pressure reads 13.0 to 13.8 MPa at the test port, the value given on page 50. If pressure is correct, inspect the suspect circuit's overload relief valve for contamination or mis-adjustment. Check the valve spool for partial sticking and the piston seal for bypass wear per the troubleshooting procedures on page 48.
Manual Section: Individual Cylinder Circuit Weak or Inoperative (Others OK)Hydraulic oil temperature gauge climbs into the red during extended trenching or digging cycles p. 48
Start with the transmission fluid level. The B2301/B2601 case holds 15 L, and low fluid is the primary cause of thermal runaway. Inspect the oil filter for clogging. If fluid level is correct, test the relief valve for continuous bypass: a stuck-open relief dumps full pump flow as heat. Follow the overheating checklist on page 48.
Manual Section: Hydraulic Oil OverheatsBoom cylinder rod drifts down slowly after parking, bucket settles to ground on its own p. 68
Examine the boom cylinder piston seal ring for wear or bypass damage. A failing seal lets pressurized oil migrate past the piston, dropping the load. Measure the rod for straightness: the allowable bend limit is 0.25 mm per page 68. Also check the rod O.D. (30.0 mm nominal per page 46) for scoring that accelerates seal wear.
Manual Section: Excessive Cylinder MovementFrequently Asked Questions
What are the torque specs for Kubota BH70 mounting bolts?
For the Kubota BH70 backhoe, the sub frame mounting bolt and nut (M16) should be tightened to 176 to 203 N·m (130 to 150 lbf·ft). The sub frame mounting nut (M12) requires a torque of 90 N·m (66.4 lbf·ft). These torques should be checked regularly, especially when new, and tightened if loose.
Why is my Kubota BH70 backhoe moving slowly or weakly?
If your Kubota BH70 backhoe is moving slowly or weakly, potential causes include insufficient engine rpm, a malfunctioning relief valve, or a hydraulic pump malfunction. Additionally, insufficient transmission fluid can lead to slow or weak operation. For individual cylinder issues, causes might be a valve spool not moving fully, a mis-adjusted overload relief valve, worn piston seal rings, or damaged hydraulic hoses.
How to install Kubota BH70 backhoe
To install the Kubota BH70 backhoe, first ensure the swing lock pin is installed. Slowly back the tractor, centering it to the backhoe main frame, stopping 254 to 304 mm (10.0 to 12.0 in.) away. Connect the backhoe inlet hose (red) to the tractor outlet pipe (red), the backhoe outlet hose (blue) to the tractor tank hose (blue), and the backhoe power beyond hose (yellow) to the tractor power beyond hose (yellow).
How to remove Kubota BH70 backhoe
To remove the Kubota BH70 backhoe, set the swing lock pin to prevent boom pivoting, then lower the boom until the back of the bucket contacts the ground. Keep stabilizer pads about 381 mm (15.0 in.) high (page 55). Disconnect the hydraulic hoses (inlet, outlet, and power beyond) from the tractor, then restart the engine and drive the tractor slowly away from the backhoe. Finally, stop the engine and set the parking brake (page 57).
Is this Kubota BH70 Workshop Manual a digital download?
This is a 69-page searchable PDF that downloads the moment your checkout completes. Open it on a laptop, tablet, or phone and bring it right to the shop floor.
Can I print this Kubota BH70 manual?
Yes. The PDF carries no DRM, so you can print any page or section your shop needs on any standard printer.
Does this Kubota BH70 Workshop Manual cover the hydraulic system?
Yes. It includes complete hydraulic schematics: flow diagrams, valve configurations, and pressure specifications.
Document Quality
This document is a hybrid PDF, featuring crisp, native digital text that you can easily search and copy. Diagrams and illustrations are consistently clear and readable, whether they are vector-like drawings or high-quality photographs, with all labels remaining legible. The pages are clean, free from scan artifacts, stains, or skewed content. You will find a few intentionally blank pages that serve as section separators within the document structure.
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