Part of the Kubota Repair Manuals.
This is the Kubota factory workshop manual for the BH70 backhoe, publication 9Y111-13460. It is the service level document, organized into Information, General, Mechanism, and Servicing sections covering identification, specifications, the hydraulic control valve, and complete repair procedures.The Mechanism section details the hydraulic circuit, the control valve structure and operation, the overload relief valve, and the hydraulic cylinders. The Servicing section adds troubleshooting, servicing specifications, tightening torques, and checking, disassembling, and adjusting procedures for the valve and cylinders.Use it to diagnose a sluggish or sticking dipper function, correct a sloppy bucket curl lever, verify relief valve pressure, torque the sub frame and cylinder hardware to spec, and rebuild worn cylinders. It is a downloadable PDF you can open on any device or print for the shop, so the diagrams and torque tables are on hand while you work.
What's Inside This Kubota BH70 Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | - | - |
| General | - | Identification, Lubricants, Tightening Torques (Stud Bolts, American Standard Screws, Bolts and Nuts with, Plugs, Hydraulic Fittings), Maintenance Check List |
| Mechanism | - | Hydraulic Circuit, Control Valve (Structure, Operation, Overload Relief Valve), Hydraulic Cylinder |
| Servicing | - | 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
Dipper extend sticks or hydro-locks
The dipper extend function can become sluggish or appear hydraulically locked when oil gets trapped in the valve spool cap. The Mechanism section covers the control valve structure and operation to trace it.
Manual Section: Mechanism p. 28Bucket curl lever feels sloppy
A bucket curl in and out lever that feels loose or does not work right points to linkage play or a valve issue. The Servicing section covers checking and adjusting the control lever and its operating force.
Manual Section: Servicing p. 47Weak or slow digging
Reduced digging force or slow boom movement is a common backhoe symptom. The Servicing troubleshooting charts walk you from the reported fault to the likely hydraulic cause.
Manual Section: Servicing p. 47Relief valve set wrong
An overload relief valve that is out of adjustment reduces performance or lets functions stall. The Mechanism section explains the overload relief valve and gives its setting pressure.
Manual Section: Mechanism p. 28Sub frame mounting bolts loosen
The sub frame bolts carry the backhoe load and can back off if not torqued correctly. The General section provides the M16 sub frame mounting bolt torque and the other tightening values.
Manual Section: General p. 15Worn cylinder rods and bushings
Play or leaks at the boom, dipper, or bucket cylinders come from worn rods, pins, and bushings. The Servicing section gives the clearance limits and cylinder overhaul procedures.
Manual Section: Servicing p. 47Frequently Asked Questions
What does this manual cover?
It is the Kubota factory workshop manual for the BH70 backhoe, publication 9Y111-13460. It covers specifications, the hydraulic circuit and control valve, the overload relief valve, troubleshooting, servicing clearances, tightening torques, and cylinder overhaul.
What is the relief valve pressure?
The Mechanism section covers the control valve and overload relief valve and gives a relief valve pressure of 13.0 to 13.8 MPa (1890 to 2000 psi), useful when checking weak or stalling functions. p. 28
Does it give the sub frame mounting bolt torque?
Yes. The General section lists the tightening torques, including the M16 sub frame mounting bolt and nut torque of 176 to 203 N·m. p. 15
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 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.
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