Description

Kubota B4672A, BL4690A 2002 Operators Manual

You got a Kubota backhoe that needs a rebuild, or you’re putting a B4672A or BL4690A onto a tractor that wasn’t born with it. Either way, you need the real torque numbers, the correct hydraulic circuit, and the exact procedure for setting up the stabilizers. Guessing on a backhoe gets people hurt – there’s a reason the stabilizer lock pins are there. I have torqued head bolts on diesel engines long enough to know that aftermarket manuals will tell you “tighten to spec” without telling you the spec. This Kubota B4672A, BL4690A 2002 Operators Manual is the OEM document, Form 70000-73822, Rev. 3/02. It runs 73 pages, and every page is factory-verified.

Safety First – Before You Throw the Levers

Open to page 3 and you’ll see the safety precautions section broken into Before Operation, During Operation, and Maintenance. That’s not filler – that’s the difference between keeping your fingers and losing them. The manual spells out what happens if you skip the stabilizer lock procedure. It also tells you which safety signs must be legible on the machine. I’ve seen guys try to run a backhoe with a missing ROPS warning sticker. That’s a lawsuit waiting to happen.

What Does This Manual Cover for the B4672A and BL4690A?

Specifications chapter starts with backhoe terminology (page 8) so you know the difference between crowd and curl before you touch the joysticks. Then general information with model/serial number locations – critical when ordering replacement parts. Pre-operation instructions include an operational check-out list. If you skip that, you risk running the swing chain dry. The manual covers both the B4672A and the BL4690A models. There’s no “this might apply” – it’s specific.

Read the Operating Instructions Before You Start Digging

The operating instructions section (starting around page 10) covers operating speeds, backhoe controls, placing stabilizers, general operation, backfilling, loading trucks, lifting or craning, transporting the backhoe, and removing/reinstalling. Each sub-section has a safety warning built in. For example, the “Lifting or Craning” section tells you the load limits and the correct lift point. I’ve seen homemade lifting brackets fail. Don’t be that guy.

73 Pages of Factory Specs – Including the Torque Chart

Page 22 is the torque tightening chart. That’s a single page with bolt grades and torque values for the backhoe. If you’re bolting the mast to the tractor bracket, you need that chart. Aftermarket manuals often omit the torque or give generic values – this one is straight from Kubota. The lubrication and maintenance section (page 19) shows every grease fitting location and the hydraulic system service interval. Swing chain adjustment procedure is on page 20. The hydraulic circuit schematic is on page 21 – essential for diagnosing a weak swing or slow boom.

Setting Up the Backhoe: Tractor Preparation and Mast Charts

Setting up instructions run from page 23 to 42. That’s over a dozen pages covering backhoe/tractor/ROPS applications, tractor preparation, backhoe preparation, sub-assembly, and mast charts for five tractor groups (Group 1 through Group 5, plus a Special Group 4). If you’re mounting this backhoe on a tractor that’s not listed, you need to measure the mast spacing yourself – but at least the manual gives you the factory dimensions. It also covers swing and boom locks, installing the backhoe bucket, and set-up service and lubrication. Don’t skip the set-to-ROPS adjustment on page 34; that affects stability.

Parts Illustrations: When You Need to Know What’s Broken

Starting on page 43, the manual has exploded-view parts illustrations for mainframe components, seat and mast, boom, dipper, stabilizers, hydraulic controls, control valve fittings and hoses, pump hydraulics, F.T.O. front service parts, control valve service parts, and cylinder service parts (swing, boom, stabilizer/crowd, and curl). Each illustration has part numbers, and the numerical index at the end (page 70) lets you cross‑reference. If you need a replacement swing cylinder, you’ll find the exact seal kit number. That’s the kind of detail that keeps your machine running and your phone from ringing.

Related manuals you might need:

• Kubota B4672A BL4690A 2002 Operators Manual – OEM Factory Specs
• Kubota KX057-4, U55-4, U48-4 2010 Operators Manual – OEM Specs
• Kubota L3540 L5240 L5740 L3240 2011 Operators Manual – OEM Specs

If you’re unfamiliar with how a Manual Transmission works on the tractor side, you might want to look that up – the backhoe PTO drive relies on it. Also, check the Manual Transmission section of your tractor’s service manual for engagement procedures.

Frequently Asked Questions

Does this manual include the torque values for the backhoe mounting bolts?

Yes. Page 22 is the Torque Tightening Chart. It lists torque values for bolts of various sizes and grades. Use that when mounting the mast or attaching the bucket.

Can I use this manual for a different model backhoe?

No. This manual is specifically for the Kubota B4672A and BL4690A backhoes. Different models have different swing chains, stabilizer geometries, and hydraulic pressures.

What lubrication schedule does the manual recommend?

The Lubrication & Maintenance section starting on page 19 shows every grease fitting location and recommends greasing after every 8 hours of operation. The hydraulic system service interval is every 200 hours. The manual also includes a swing chain adjustment procedure.

Where can I find the parts diagram for the boom cylinder?

Look at the Cylinder Service Parts section starting on page 66. The boom cylinder diagram is part of the “Boom, Stabilizer/Crowd & Curt” subsection. You’ll find the seal part numbers there.

You need a factory manual that doesn’t guess. The only way to get the correct torque chart, the right hydraulic schematic, and the exact part numbers for your B4672A or BL4690A backhoe is the OEM Operators Manual. Access the Factory Manual now – it’s 73 pages of spec that keeps your machine safe and your repair accurate.