Description

Bobcat 320, 320L, 322 2006 Service Manual

If you’re wrenching on a Bobcat 320, 320L, or 322 excavator from the D Series, you need the real factory documentation. I’ve seen too many guys chase hydraulic leaks using aftermarket diagrams that don’t match serial number breaks. This Bobcat 320, 320L, 322 2006 Service Manual is from Bobcat Company – not a reprint. It’s 728 pages of the same book a dealer tech uses. The safety warnings alone on page 3 will remind you why you don’t skip steps.

Never service the Bobcat Hydraulic Excavator without instructions. That line from page 1 of the manual is not optional. The manual opens with maintenance safety, then an alphabetical index, and a foreword that sets the tone: only qualified Bobcat service personnel should perform procedures not in the Operation & Maintenance Manual. I respect a company that doesn’t assume you know what you’re doing. This document gives you the fire prevention checklist, serial number locations for both excavator and engine, delivery report forms, and the Bobcat excavator identification page. Every section is keyed to real serial number ranges, not generic model years.

Engine and Lubrication System Coverage

The engine section covers the cooling system, fuel system, and lubrication. You get fuel specifications, filling and draining procedures, and the exact method for removing air from the fuel system after filter changes. The engine lubrication system chapter walks you through checking oil and replacing the oil filter. These are the exact procedures the Bobcat factory uses, not summaries written by someone who never held a wrench. The cooling system section includes cleaning, coolant level checks, and replacement intervals. Ignoring the fuel filter water removal step leads to injector damage – the manual calls it out clearly.

Does This Manual Cover the Hydraulic System?

Yes, and it goes deep. The hydraulic system section opens with hydraulic/hydrostatic schematics and a troubleshooting chart. Then it breaks down every cylinder – boom, arm, boom swing, bucket, blade, and track frame expansion. Each cylinder has removal, installation, disassembly, and assembly steps with parts identification. You also get sections for the main relief valve, port relief valves, crossport relief valves, and pressure reducing valve – all with testing and adjusting procedures. The hydraulic control valve assembly is split into two serial number ranges, because Bobcat changed the valve stack mid-production. The auxiliary valve section disassembly and assembly is separate from the blade valve section. This is the kind of detail aftermarket manuals miss.

7 Pages of Serial Number Breaks and Safety Instructions

From the first page of this manual, you see serial number breaks. For example, the tailgate adjustment has two separate procedures depending on whether your machine is S/N 223513558 & Below and 223812078 & Below, or above. The hydraulic control valve assembly also splits into two serial number ranges. You have to know your machine’s serial number to use the right procedure. The safety instructions on page 3 are mandatory reading – fire prevention, exhaust ventilation, battery acid handling. Don’t skip them. The manual warns: lead-acid batteries produce flammable and explosive gases. Keep arcs, sparks, flames, and lighted tobacco away. If acid contacts skin, flush with water. For eye contact, flush and get immediate medical attention. That level of safety detail is what I expect from a factory manual.

Know your serial number before you start.

Verify Your Serial Number Before Ordering

This manual covers 320/320L (S/N 223811001 & Above) and 322 (S/N 223511001 & Above) D Series. If your machine falls under an earlier serial number, you need a different manual. Check the serial number locations section in the manual to find the excavator serial number and engine serial number. The delivery report and Bobcat excavator identification pages help confirm you have the right match. For those with older machines, consider the Bobcat 320 322 1997 Service Manual or the Bobcat 320 322 2006 Service Manual if you only need the 320 and 322. There is also a separate Bobcat 320 320L 2006 Service Manual for those specific models. Matching the correct manual to your serial number saves you from cross-referencing wrong torque specs.

Hydraulic Control Valve Assembly: Two Serial Number Ranges

The hydraulic control valve assembly is covered in two separate sections – one for S/N 223512346 & Below and 223814376 & Below, another for S/N 223512347 & Above and 223814377 & Above. Each includes a description, removal and installation, control valve identification, and disassembly/assembly for every valve section: auxiliary, blade, swing, left travel, boom, bucket, build up, arm, boom swing, right travel. Using the wrong section can lead to incorrect port relief pressure settings. The manual also provides testing and adjusting for port relief valves with separate procedures for the two serial number ranges. If you’re dealing with a crossport relief valve or pressure reducing valve, the same split applies. This is not a manual you can use without paying attention to serial numbers – that’s why the factory put them in every chapter.

External resources on Manual Transmission theory won’t help you here; Bobcat excavators use hydrostatic drive, but the final drive case oil check and drain procedures are in this manual. For general drivetrain knowledge, a separate resource on Manual Transmission might be useful for other vehicles, but this manual focuses on the Bobcat hydraulic system exclusively.

Is this the original factory manual?

Yes, it’s the Bobcat Company dealer copy from 2006.

What serial number ranges does it cover?

This manual covers 320/320L (S/N 223811001 & Above) and 322 (S/N 223511001 & Above) D Series. However, many procedures have sub-sections for different serial number ranges. For example, the hydraulic control valve assembly is split between S/N 223512346 & Below and 223814376 & Below, and S/N 223512347 & Above and 223814377 & Above. The tailgate adjustment also has two separate serial number breaks. You need to match your machine’s serial number exactly to the correct procedure. Ignoring these breaks can result in using wrong torque specs or misaligned parts.

Access the Factory Manual from AutoRepairManuals and get the exact documentation your Bobcat 320, 320L, or 322 needs. No shortcuts, just factory data.