Description

Bobcat 425 2006 Service Manual – Factory Specs from the OEM Source

If you are tearing down a Bobcat 425 and don’t have the factory documentation, you are working blind. I have seen too many guys guess at port relief valve pressures or skip the slew lock procedure – then wonder why the machine dumps oil or they get hurt. This 686-page service manual from Bobcat gives you the exact sequence for every job, from bleeding the fuel system to rebuilding the piston pump. No aftermarket guesswork. You get the same binder the dealer techs use.

Engine and Fuel System: Factory Procedures

The manual starts with the basics that most people skip. The AIR CLEANER SERVICE section tells you to check the filter daily and gives the replacement interval. The ENGINE COOLING SYSTEM chapter walks you through cleaning, checking level, and replacing coolant. That sounds simple, but doing it wrong means overheating a $4,000 engine. The FUEL SYSTEM chapter includes the proper fuel specification, filling procedure, filter replacement, and the critical step of removing air from the system after a filter change. If you do not follow the manual’s sequence for bleeding, you will chase a no-start condition for hours.

Hydraulic System: Troubleshooting the Circuits

This is where the 425 gets complicated. The HYDRAULIC/HYDROSTATIC SCHEMATICS section has full diagrams for every circuit. The troubleshooting guide covers the main hydraulic circuit, cylinder circuit, swing (upperstructure slew) circuit, and travel circuit. You get the factory diagnostics – not a generic flowchart. For example, the SWING CIRCUIT troubleshooting lists specific pressures and flow rates. If you cannot get the slew to hold, you test the port relief valves as described. The book shows you how to test and adjust the main relief valve, port relief valves, crossport relief valves, and the pressure reducing valve. Each valve has a separate procedure with torque specs for the locknuts. Do not trust a third-party manual for these values; one wrong shim stack and you wipe out a pump.

3 Critical Safety Procedures from the Manual

Page 26 (approximate – the manual uses its own numbering) covers lifting and blocking the excavator. The procedure is specific: lower the bucket and blade to the ground, engage the upperstructure slew lock, and use the correct jacking points. The manual warns against working under a machine supported by hydraulics alone. Another safety step is in the STOPPING THE ENGINE AND LEAVING THE EXCAVATOR section – it tells you to set the slew lock, lower attachments, and secure the cab door. These are not suggestions. The third critical section is the SPARK ARRESTOR MUFFLER cleaning procedure. If you operate in fire-prone areas, you need the factory cleaning interval and method. Missing that step can cause a wildfire.

Bobcat 425 2006 Service Manual – Cylinder Rebuild Data

The manual breaks down every cylinder – boom, arm, boom swing, bucket, blade. Each gets its own testing procedure, removal and installation, parts identification, disassembly, and assembly. That means you get the correct seal orientation, torque for the gland nut, and inspection criteria for the rod. I have seen guys mix up the boom and arm cylinder parts because they look similar – the manual’s parts identification photos prevent that. The BUCKET CYLINDER section alone is worth the price if you are swapping seals. Remember to use the factory torque spec on the piston nut; aftermarket manuals often miss the tightening sequence.

Source Validity – OEM vs Aftermarket

This is a direct reproduction of the Bobcat Company service manual – not a third-party compilation. The original part number is 6904866 (11-06). It was printed in the USA for dealer use. The manual includes the serial number range S/N A1HW11001 & Above. If you buy aftermarket manuals, you risk getting generic specs that do not match your machine’s build. For example, the hydraulic fluid chart in this manual lists the exact viscosity grades for your region. An aftermarket book might say “use 10W-30” but the factory chart says SAE 10W for -10°F to 100°F and SAE 30 for above 60°F. Using the wrong fluid can damage the pump. Stick with the OEM source.

FAQ – Common Questions About This Manual

Does this manual cover the engine removal procedure?

The manual covers engine lubrication, cooling, and fuel systems but does not detail full engine removal. For that, refer to the Bobcat engine service manual separate from this chassis manual.

What torque values are listed for the hydraulic pump?

Yes.

Is the wiring diagram included in this manual?

The hydraulic/hydrostatic schematics are included, but full electrical wiring diagrams are not part of this service manual. The manual focuses on hydraulic, mechanical, and structural systems. For electrical troubleshooting, you need the Bobcat Electrical Service Manual.

How are the pages organized – can I find specs quickly?

The manual starts with a table of contents and an alphabetical index. Each major system (Hydraulic System, Safety and Maintenance) has numbered sections. You can flip to the section you need. The index lists every component from “Alternator Belt” to “Window Washer Reservoir.” If you have a specific hydraulic component, look up the cylinder or valve name. For torque specs, go to the assembly sections – they list torque values at the end of each procedure.

If you work on compact excavators, you need the factory manual for the Bobcat 425. Access the Factory Manual now and stop guessing on pressure settings, torque specs, and safety procedures. I have torqued enough head bolts to know – the factory book saves you from a comeback. Get it here: Bobcat 425 2006 Service Manual.

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For reference on manual transmissions in other equipment, see Manual Transmission and this Manual Transmission video on maintenance basics.