Bobcat 320 325 331 Service Repair Manual & Wiring Diagrams PDF

Complete Bobcat 320, 325 and 331 Service Repair Manual in digital PDF format, covering engine repair, hydraulic systems, drive and undercarriage, swing systems, chassis, electrical equipment and detailed wiring diagrams.

This comprehensive technical reference includes mechanical repair procedures, hydraulic schematics, troubleshooting information and electrical system documentation for the Bobcat 320, 325 and 331 compact excavators. The manual also covers serial-number-specific component variations, including Dukes and Husco hydraulic control valves and Kayaba and SOM travel motors.

Service Manual & Wiring Diagrams Index

General Information & Operations

• Operator safety warnings and fire prevention procedures.
• Machine specifications including dimensions, capacities, lift capacity, performance and weights.
• Operating instructions for joystick controls using ISO and Standard patterns.
• Speed, steering and blade controls.
• Starting procedures and track operation.
• Excavating, lifting loads and machine transport procedures.

Preventive Maintenance

• Complete service schedules and daily inspection procedures.
• Maintenance safety guidelines.
• Engine lubrication and cooling system maintenance.
• Coolant and engine oil replacement.
• Alternator belt adjustment and radiator service.
• Fuel system filters, bleeding procedures and fuel specifications.
• Hydraulic fluid inspection, filter replacement and lubrication points.
• Rubber and steel track tension adjustment.
• Final drive oil replacement.
• Spark arrestor muffler cleaning.

Engine Mechanical Service & Overhaul

• Engine removal, installation and complete disassembly and assembly procedures.
• Cylinder head service and valve clearance adjustment.
• Valve and seat reconditioning.
• Piston, connecting rod and crankshaft service.
• Crankshaft re-grind data and cylinder liner inspection.
• Timing gear and camshaft service.
• Water pump and oil pump service.
• Fuel injection pump timing and service.
• Injector nozzle testing.
• Fuel shut-off solenoid service.
• Glow plug replacement.

Hydraulic System & Schematics

The hydraulic section provides detailed Bobcat hydraulic schematics, troubleshooting information and service procedures for the main hydraulic system and its components.

• Hydraulic system schematics.
• Hydraulic troubleshooting charts.
• Diagnostic testing using hydraulic couplers.
• Hydraulic pump removal, installation and disassembly.
• Main relief valve adjustment and testing.
• Port relief valve adjustment and testing.
• Dukes hydraulic control valves including 3-spool and 6-spool configurations.
• Husco hydraulic control valves including 5-spool and 6-spool configurations.
• Inlet, outlet, mid-inlet, lock-out and build-up valve sections.
• Accumulator, port block and two-speed valve service.
• Auxiliary selector valve and hydraulic oil cooler service.
• Boom, bucket, arm, blade and boom swing hydraulic cylinder repair.

Drive System & Undercarriage

• Control console, joystick, steering lever and foot pedal removal and installation.
• Track frame disassembly and assembly.
• Track idler and track roller service.
• Travel motor removal, disassembly, assembly and testing.
• SOM travel motor service procedures.
• Final drive service and related technical data.
• Track damage identification for rubber and steel track configurations.

Upper Works & Swing System

• Cab and ROPS canopy removal and installation.
• Seat, engine cover, side panel and counterweight removal.
• Swing motor service and disassembly.
• Cross-port relief valve procedures.
• Swing gearbox disassembly, assembly and timing.
• Upperstructure and swing circle gear service.
• Center swivel joint and manifold overhaul.
• Boom, arm and bucket linkage service.
• Pivot pin and swing bracket bushing replacement.

Electrical Equipment & Wiring Diagrams

The electrical section includes wiring schematics and electrical troubleshooting charts for the Bobcat 320, 325 and 331 series.

• General electrical system service and troubleshooting.
• Electrical wiring schematics.
• Fuses and relays.
• Diodes and electrical system components.
• Battery testing, removal and jump-starting procedures.
• Starter motor service and testing.
• Alternator disassembly and inspection.
• Stator and rotor testing.
• Instrument panel electrical systems.
• Cab electrical components.
• Light switches.
• Fuel level sender service.

Bobcat 320 325 331 Wiring Diagrams PDF

The Bobcat 320 325 331 Wiring Diagrams section provides electrical schematics and troubleshooting information for the machine electrical system.

Coverage includes fuses, relays, diodes, battery circuits, starter motor, alternator, instrument panel, cab electrical components, light switches and fuel level sender systems.

The electrical information can be used together with the mechanical and hydraulic sections when troubleshooting faults involving both electrical and hydraulic machine functions.

Bobcat Hydraulic Schematics & Hydraulic Repair

The hydraulic section is one of the major components of this Bobcat service repair manual. It includes hydraulic system schematics, diagnostic procedures, relief valve adjustment, hydraulic pump service and detailed control valve overhaul instructions.

The documentation specifically covers Dukes and Husco control valves, including different spool configurations, as well as accumulators, port blocks, two-speed valves, auxiliary selector valves and hydraulic cylinders.

Dukes & Husco Hydraulic Control Valves

Because the 320, 325 and 331 series include different hydraulic component configurations, the manual provides separate service information for the applicable valve assemblies.

• Dukes 3-spool control valves.
• Dukes 6-spool control valves.
• Husco 5-spool control valves.
• Husco 6-spool control valves.
• Valve disassembly and assembly procedures.
• Main relief and cross-port relief adjustments.
• Component identification by applicable serial-number ranges.

Bobcat Engine Repair & Reconditioning

The engine section provides detailed mechanical information for complete engine service and overhaul.

• Engine removal and installation.
• Engine disassembly and assembly.
• Cylinder head and valve service.
• Piston and connecting rod inspection.
• Crankshaft inspection and re-grind information.
• Cylinder liner service.
• Timing gear and camshaft.
• Water pump and oil pump.
• Fuel injection pump timing.
• Injector nozzle testing.
• Glow plug replacement.

Bobcat Travel Motors, Final Drive & Tracks

The drive and undercarriage sections cover the mechanical systems responsible for machine travel and track operation.

• Travel motor removal, disassembly and assembly.
• Kayaba and SOM travel motor service information.
• Travel motor testing.
• Final drive service.
• Track frame and roller service.
• Track idler service.
• Rubber and steel track configurations.
• Track damage identification.
• Track tension adjustment.

Bobcat Swing Motor & Upperstructure Repair

The upper works section includes procedures for the swing motor, swing gearbox, swing circle gear and center swivel joint, together with boom, arm and bucket linkage components.

• Swing motor removal and overhaul.
• Cross-port relief valve service.
• Swing gearbox disassembly and assembly.
• Swing gearbox timing procedures.
• Swing circle gear service.
• Center swivel joint overhaul.
• Boom, arm and bucket linkage repair.
• Pivot pin and bushing replacement.

Bobcat ISO & Standard Joystick Controls

The operator and control sections include information for ISO and Standard joystick control patterns, together with control console, joystick, steering lever and foot pedal service procedures.

The documentation also provides procedures for applicable hydraulic control-pattern changes and pilot hose routing.

Serial Number Specific Repair Information

The Bobcat 320, 325 and 331 series span multiple production configurations. The supplied documentation identifies component variations by serial number, including different hydraulic control valve assemblies and related parts identification.

This serial-specific structure helps identify the correct service information for the particular machine configuration being repaired.

Complete Bobcat 320 325 331 Service Manual Coverage

Engine: engine removal, overhaul, cylinder head, valves, pistons, connecting rods, crankshaft, timing gear, camshaft, water pump, oil pump and fuel injection pump.

Hydraulics: hydraulic schematics, hydraulic pump, relief valves, Dukes and Husco control valves, accumulators, auxiliary valves, oil coolers and hydraulic cylinders.

Drive: travel motors, final drives, track frames, idlers, rollers and track tension.

Upper Works: swing motor, swing gearbox, swing circle, center swivel joint, boom, arm, bucket and linkage.

Electrical: wiring schematics, fuses, relays, diodes, battery, starter, alternator, instrument panel, cab electrical equipment, lighting and fuel level sender.

Maintenance: engine fluids, cooling system, fuel system, hydraulic fluid, lubrication, tracks, final drive oil and routine inspections.

Technical Manual Specifications

Digital Bobcat Service Repair Manual PDF

The supplied product information identifies the complete technical reference as a 3,298-page PDF with an approximate file size of 147 MB.

The digital format allows the manual to be searched electronically and viewed on a PC, laptop, tablet or mobile device. Detailed service procedures, electrical schematics and hydraulic flow information can be accessed directly from the PDF.

Electrical Wiring Diagrams & Hydraulic Schematics

This Bobcat 320 325 331 Service Manual PDF combines mechanical repair information with both electrical wiring diagrams and hydraulic schematics. This makes it possible to reference the electrical system, hydraulic control circuits and mechanical assemblies within the same technical document.

Secure Digital Delivery

After completing your purchase, the Bobcat service repair manual is provided as a digital PDF download.

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For download instructions, see our download guide.

Frequently Asked Questions

Does the Bobcat 320 325 331 manual include wiring diagrams?

Yes. The electrical section includes wiring schematics and electrical troubleshooting charts, together with information for fuses, relays, diodes, battery, starter, alternator and instrument panel systems.

Does it include hydraulic schematics?

Yes. The manual contains hydraulic system schematics, troubleshooting charts and diagnostic procedures covering hydraulic pumps, relief valves, control valves and hydraulic cylinders.

Are Dukes and Husco hydraulic valves covered?

Yes. The documentation includes service information for Dukes and Husco control valves, including different 3-spool, 5-spool and 6-spool configurations.

Does the manual cover engine rebuilding?

Yes. The engine section includes engine removal, complete disassembly and assembly, cylinder head, pistons, connecting rods, crankshaft, cylinder liners, timing gear and fuel injection pump service.

Are Kayaba and SOM travel motors included?

Yes. The drive system section includes Kayaba and SOM travel motor removal, disassembly, assembly and testing procedures.

Does the manual cover rubber and steel tracks?

Yes. The documentation includes track tension adjustment and track damage identification for rubber and steel track configurations.

Does it cover ISO and Standard joystick patterns?

Yes. The operating and hydraulic sections include information for ISO and Standard joystick control patterns, together with the relevant control and hydraulic procedures.

Is the information organized by serial number?

Yes. The supplied information identifies serial-number-specific component and service variations, particularly for hydraulic control valve configurations.

How many pages does the Bobcat manual contain?

The supplied product information identifies the complete reference as 3,298 pages.

Bobcat 320 325 331 Service Repair Manual & Wiring Diagrams PDF

Get the Bobcat 320 325 331 Service Repair Manual PDF covering engine repair, hydraulic schematics, Dukes and Husco control valves, travel motors, final drives, swing systems, undercarriage, electrical wiring diagrams, troubleshooting and serial-number-specific service information.