Part of the Kubota Operator Manuals.
This is the operator manual for the Kubota B4672A and BL4690A backhoe attachments, the factory reference for setting up, operating, and maintaining these units on a compatible Kubota tractor. Its 73 pages combine operating guidance with full parts illustrations.
You get safety precautions and sign locations, specifications, pre-operation checks, and detailed operating instructions covering the controls, stabilizers, backfilling, loading trucks, lifting, and transporting. Lubrication and maintenance sections cover the hydraulic system, bucket service, and swing chain adjustment, backed by a torque tightening chart and complete setting-up instructions with mast charts for different tractor groups.
The parts illustrations map the mainframe, boom, dipper, stabilizer, hydraulic controls, and cylinders with a numerical index. Whether you are mounting the backhoe for the first time or servicing one already in use, this PDF download gives you operation, maintenance, and parts reference in one file, ready to view or print.
What's Inside This Kubota B4672A, BL4690A Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Precautions | - | Safety Alert Symbol, Before Operation, During Operation, Maintenance, ROPS and Seat Belt |
| Safety Signs | - | Safety Sign Locations, Care of Safety Signs, Safety Sign Illustrations, Part Numbers |
| Specifications | - | Digging Depth, Swing Arc, Loading Height, Hydraulic Cylinders, Backhoe Terminology |
| General Information | - | General, Model/Serial Information, Backhoe Model Number, Tractor Model Number |
| Pre-Operation Instructions | - | Operational Check-Out, Operating Speeds, Backhoe Controls, Stabilizer Placement |
| Operating Instructions | - | Operating Speeds, Backhoe Controls, Placing the Stabilizers, Backfilling the Excavation, Loading Trucks, Lifting or Craning, Transporting the Backhoe |
| Lubrication & Maintenance | - | Lubrication Fittings, Hydraulic System Service, Backhoe Bucket Service, Swing Chain Adjustment, Hydraulic Circuit Schematic |
| Torque Tightening Chart | - | Sae Grade 5, Metric Grade 8.8, Bolt Sizes, Special Torque Applications |
| Setting Up Instructions | - | Backhoe/Tractor/ROPS Applications, Tractor Preparation, Backhoe Preparation, Backhoe Sub-Assembly, Mast Charts, Group 1 Tractors, Group 2 Tractors, Group 3 Tractors |
| Parts Illustrations | - | Mainframe Components, Seat & Mast Components, Reinforced 3-Point Top Link Brackets, Boom Components, Dipper Components, Stabilizer Components, Hydraulic Controls |
| Numerical Index | - | Part Number, Page Reference, Code |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Torque for 5/8-18 nut on 5/8-18x4 hex stop bolt | 95-105 ft. lbs. (13.2~14.5 kgf-m) | p. 24 |
| Swing Arc | 180° | p. 9 |
| Minimum Ground Clearance | 8.5" (216 mm) | p. 9 |
| Digging Force - Curl Cylinder | 2950 lbs (1338 kg) | p. 9 |
| Hydraulic System Capacity | 6.5 US gallons | p. 20 |
| Hydraulic Oil/Filter Change Interval (Subsequent) | 250 hours | p. 20 |
| Swing Chain Adjustment Check Interval (Subsequent) | 40 hours | p. 20 |
| Swing Cylinder Retaining Bolts Torque | 140-160 ft. lbs. (190-218 N-m) | p. 23 |
| ROPS Stop Bolt Torque | 95-105 ft. lbs. (13.2-14.5 kgf-m) | p. 24 |
| Minimum Seat to ROPS Clearance | 40 inches | p. 40 |
| B4672A | ||
| B4672A Digging Depth | 73.9" (1877 mm) | p. 9 |
| BL4690A | ||
| BL4690A Digging Depth | 90.2" (2291 mm) | p. 9 |
Kubota B4672A, BL4690A Common Problems This Manual Covers
Controls become sloppy and squeaky
After a few hundred hours the backhoe controls can feel loose and stiff, needing lubrication and adjustment. The lubrication and maintenance section covers the fittings and linkage service that fix it.
Manual Section: Lubrication & Maintenance p. 20Stabilizers or cylinders drift down when parked
Leak-down that lets the stabilizers or boom settle while the machine sits points to hydraulic seal or valve wear. The hydraulic system service guidance in this section is the starting point.
Manual Section: Lubrication & Maintenance p. 20Loose mounting and stop bolts after setup
Mounting hardware that works loose leaves the backhoe unsafe and misaligned. The torque tightening chart gives the correct values for the bolts so they stay put.
Manual Section: Torque Tightening Chart p. 23Trouble removing or reinstalling the backhoe
Mounting and dismounting the backhoe can go wrong without the right sequence and stabilizer positions. The operating instructions cover removing and reinstalling the backhoe safely.
Manual Section: Operating Instructions p. 13Worn bucket pins and bushings
Slop at the bucket and links from worn pins is a normal wear item on a working backhoe. The parts illustrations identify the bucket, dipper, and pin components to order replacements.
Manual Section: Parts Illustrations p. 44Hydraulic hose and fitting leaks
Visible fluid weeping from hoses or fittings shows up on daily inspection and needs prompt attention. The lubrication and maintenance section covers the hydraulic system service and checks.
Manual Section: Lubrication & Maintenance p. 20Frequently Asked Questions
Which backhoes does this manual cover?
It covers the Kubota B4672A and BL4690A backhoe attachments, including setting-up instructions and mast charts for mounting them on the compatible tractor groups.
What is the digging depth of each model?
The B4672A digs to 73.9 in (1877 mm) and the BL4690A digs to 90.2 in (2291 mm). The specifications section lists the swing arc, digging force, and other dimensions. p. 9
What is the torque for the swing cylinder retaining bolts?
The swing cylinder retaining bolts are torqued to 140 to 160 ft. lbs. (190 to 218 N-m). The torque tightening chart lists the bolt sizes and special torque applications. p. 23
How much hydraulic oil does the system hold and how often is it changed?
Hydraulic system capacity is 6.5 US gallons, with subsequent oil and filter changes at 250 hours. The lubrication and maintenance section covers the full service schedule. p. 20
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