Bobcat 321-323 Compact Excavator Service Manual 6986731-EN (01-07)

Bobcat 321 / 323 Compact Excavator Service Manual 6986731-EN (01-07)

Technical service manual developed strictly from the Table of Contents, providing full diagnostic workflows, testing procedures, removal and installation steps, overhaul instructions and system specifications for the Bobcat 321 and 323 compact excavators. Designed for precise troubleshooting, component rebuilding and performance restoration.

Model Covers:

Bobcat 321 Compact Excavator - S/N A76511001 & Above
Bobcat 323 Compact Excavator - S/N A01711001 & Above

File Format: PDF

Size: 19.42 MB

No. of pages: 643

Language: English

Delivery Method: Instant Download - Access your file immediately after purchase.

📑 Table of Contents Overview:

Safety, Identification and Maintenance

• General safety, fire prevention and operating precautions for electrical, hydraulic and fueling procedures
• Machine and engine serial number locations, excavator identification and delivery reporting
• Lifting and blocking sequence, upperstructure slew lock operation, tailgate adjustments and transport instructions
• Cab and canopy details: emergency exits, door and glazing, wiper and washer reservoir service
• Complete service schedule with maintenance intervals for filters, fluids, lubrication points and system checks
• Hydraulic oil and filter servicing, diagnostic connector use, hydraulic oil replacement and system de-aeration
• Lubrication chart: door hinges, blade, boom swing, boom base, mid boom, boom and arm joints, frame fittings and track expansion tube
• Travel motor oil level and drain, alternator belt adjustment, spark arrester cleaning, seat belt and console lockout inspection

Hydraulic System - Testing, Adjustment and Component Overhaul

• Hydraulic schematic and symbol glossary for full circuit interpretation
• Troubleshooting procedures for main, cylinder, swing and travel hydraulic circuits
• Hydraulic cylinder groups: boom, arm, bucket, boom swing, blade and track frame expansion - testing, R&I, parts identification, teardown and assembly
• Pressure calibration for main relief, port relief, crossport relief and pressure reducing valves
• Hydraulic control valve sections: travel, swing, boom swing, arm, bucket, auxiliary, boom and blade - removal, assembly and sectional rebuild
• Hydraulic pump unit: torque settings, piston and gear pump testing, auxiliary flow checks, disassembly and assembly
• Manifold block and accumulators: description, removal, rebuild and accumulator replacement
• Travel motor, swivel joint and swing motor - removal, internal service and reassembly
• Solenoid block for blade and track expansion, and slew lock valve servicing by serial range

Undercarriage and Track Assembly

• Dozer blade extension and blade R&I procedures
• Track inspection: lug height limits, tension adjustment, removal and installation
• Expandable track frame teardown and installation procedures
• Track damage diagnostics: steel cord breakage, rubber abrasion, metal separation, corrosion delamination, lug fatigue cracking and edge cuts
• Track idler and roller disassembly, rebuild and reinstallation
• Swing circle gear removal and installation steps

Upperstructure, Cab and Control Systems

• Upperstructure removal and installation
• ROPS canopy and cab R&I, sliding window service, weather and wiper strip replacement
• Seat mount, floor mat and floor panel removal and installation
• Right and left control consoles – covers, frames, springs, teardown and rebuild
• Engine speed and blade control cable service, disassembly and installation
• Travel control pedals – removal, reassembly and calibration
• Control linkage assembly – right and left half disassembly, bracket rebuild and full linkage installation
• Fuel tank, horn and swing frame servicing, including pivot bushing replacement
• Boom, arm and bucket R&I with bushing renewal procedures
• Tailgate and latch removal and installation

Electrical System and Troubleshooting

• Electrical schematic and symbol glossary for diagnostic reference
• Fuse and relay mapping with fuel timer and diode locations
• Battery servicing and booster starting, alternator output and regulator tests, charging system inspection
• Starter R&I, component cleaning and inspection
• Lighting: upperstructure and boom lights, assembly and switch replacement
• Microswitch testing for left and right consoles, two-speed switch replacement, fuel level sender diagnostics

Engine Diagnostics, Service and Reconditioning

• Troubleshooting chart for mechanical and fuel-related engine issues
• Spark arrester muffler, air cleaner and radiator – removal and installation
• Valve clearance adjustment, compression testing, fuel shutoff solenoid inspection and timer service
• Fuel injection pump checks, timing, injector testing and glow plug service
• Major component servicing: head, valves, rocker arms, camshaft, pistons, rings, rods, crankshaft, oil pump, thermostat and torque data
• Engine removal and installation, mount replacement, flywheel housing and pump coupling service
• Full reconditioning: head teardown, valve seat repair, timing checks, tappet and gearcase service, piston and rod alignment, crankshaft and bearing service, bore inspection, water pump and thermostat testing

Heater System and Components

• Heater system description and component layout
• Regulator maintenance, filter and heater coil access
• Heater unit, louvers and threaded insert R&I
• Heater coil, fan and valve removal and installation

Specifications and Reference Data

• Complete 321 and 323 specifications: dimensions, working range, lift capacities, performance, weights and controls
• System data: electrical, hydraulic pressures, cylinders, traction, brakes, slew system, fluid capacities and serviceability
• Standard features, options, attachments and bucket references
• Torque charts for SAE and metric bolts
• Hydraulic connection standards for ORFS, straight thread O-ring, tubelines, flare and port seal fittings
• Hydraulic fluid specs and conversion charts

This manual provides the full technical depth required to carry out accurate diagnostics, correct repairs and long-term component reliability for Bobcat 321 and 323 compact excavators.