Bobcat 321 323 Compact Excavator Service Manual – 6986731-EN PDF Download

Description

This is the complete Bobcat 321 323 Compact Excavator Service Manual, published under Bobcat document number 6986731-EN. It covers both the 321 (serial number A76511001 and above) and 323 (serial number A01711001 and above) compact excavators, providing the full factory service and repair procedures for these machines. From routine maintenance intervals and hydraulic system diagnostics through complete engine teardown and electrical troubleshooting, every procedure is laid out in step-by-step detail with supporting figures.

File Details

• Manual Type: Service Manual
• Brand: Bobcat
• Models Covered: 321, 323 Compact Excavators
• Serial Numbers: 321 – S/N A76511001 and Above; 323 – S/N A01711001 and Above
• Engine: Kubota D722-E2B-BC-5-SI diesel
• Language: English
• Document Number: 6986731-EN
• Page Count: 628 pages
• File Format: PDF

Chapters Covered

• Safety Instructions
• Maintenance (10-xx)
• Hydraulic System (20-xx)
• Undercarriage (30-xx)
• Upperstructure and Swing Section (40-xx)
• Electrical System and Analysis (50-xx)
• Engine Service (60-xx)
• Heater (70-xx)
• Specifications (SPEC-xx)

Maintenance (10-xx)

The maintenance chapter is your reference for keeping the Bobcat 321 and Bobcat 323 running between major service events. It opens with the full service schedule chart broken out by 8-10 hour, 50 hour, 100, 250, 500 and 1000-hour intervals. Individual sections then walk through daily checks, the air cleaner outer and inner filter replacement procedure, cab filter cleaning, engine cooling system coolant level checks and replacement, engine oil and filter changes, fuel system draining and filter replacement, hydraulic oil checks and filter replacement, and the proper lifting and blocking procedure for safe under-machine work. There is also a complete lubrication schedule covering every grease point on the excavator, plus drive motor oil level checks and draining.

Hydraulic System (20-xx)

This is the largest chapter in the Bobcat 321 323 service manual, and it covers the hydraulic side of both machines from top to bottom. Component-specific sections walk through the accumulators, arm cylinder, blade cylinder, blade/track expansion solenoid block, boom cylinder, boom swing cylinder, and bucket cylinder – each with testing, removal and installation, disassembly, parts identification, and assembly procedures. You also get full coverage of the hydraulic control valve section by section (arm, auxiliary, blade, boom swing, boom, bucket, left travel, right travel, swing), along with the main relief valve, port relief valves, crossport relief valves, pressure reducing valve, hydraulic pump (piston and gear), hydraulic filter mount, hydraulic reservoir, manifold assembly/accumulator, oil cooler, swing motor, travel motor, swivel joint, and track frame expansion cylinder. Hydraulic system information at the front of the chapter includes a full glossary of hydraulic and hydrostatic symbols plus troubleshooting charts for the cylinder, travel, and swing circuits.

Undercarriage (30-xx)

The undercarriage chapter handles everything below the upperstructure. It covers blade removal and blade extension removal/installation, the swing circle gear, and the entire track system – track frame disassembly, expandable track frame removal and installation, track idler, track roller, and track removal and installation. There is also a detailed track damage identification section that uses illustrated examples to help diagnose cutting of the steel cords, abrasion of embedded metals, separation of embedded metals, corrosion-related separation, cracks, lug abrasion, and edge cuts on both the lug side and track roller side. Track lug height measurement and track tension adjustment procedures are included with the correct sag specifications.

Upperstructure and Swing Section (40-xx)

This chapter breaks down the upperstructure and swing assembly into its individual components. You get removal and installation procedures for the upperstructure itself, the ROPS canopy, the cab, the swing frame, the boom, the arm, and the bucket, along with bushing removal and installation procedures for each. The chapter also covers the right and left consoles (including console cover removal, compression spring service, lever removal, and joystick console frame disassembly), the right and left pedals, the travel controls, the blade control, the engine speed control, the control linkage assembly, the upperstructure slew lock, the seat and seat mount, the floor mat and floor panels, the fuel tank, the horn, and the tailgate. Where applicable, figures identify each part by item number for easy reference.

Electrical System and Analysis (50-xx)

The electrical chapter starts with a glossary of electrical symbols used throughout the schematic, fuse and relay locations, and a troubleshooting chart for common charging and starting problems. From there, it covers the alternator (output test, full field test, regulator test with ammeter and voltmeter, belt adjustment, removal and installation, parts identification), battery servicing and jump starting, fuel level sender removal and testing, lights (upperstructure light and boom light), microswitches (left and right console, with testing procedures), the starter, and the two-speed boost switch. Wiring connector identification and component locations are included throughout.

Engine Service (60-xx)

The engine chapter is built around the Kubota D722-E2B-BC-5-SI three-cylinder diesel and covers it in complete detail. It opens with a troubleshooting chart, then moves into engine components and testing – valve clearance adjustment, engine compression checking, fuel shutoff solenoid and timer checks, fuel injection pump check and timing, fuel injector checking and removal/installation, and glow plug removal and installation. The chapter then covers the air cleaner, radiator, spark arrestor muffler, flywheel and housing, and full engine removal and installation. The reconditioning section goes deep: cylinder head removal and disassembly, valve and valve seat reconditioning, valve guide checking, valve spring measurement, valve tappets, rocker arm and shaft checking, timing gearcase cover, idler gear and camshaft, fuel camshaft and governor, crankshaft gear, oil pan, oil pump, relief valve, piston and connecting rod, crankshaft and bearings, cylinder bore checking, water pump, and thermostat. Engine specifications, torque values, and service limits are all listed.

Heater (70-xx)

The heater chapter covers the cab heating system. It includes the heater system description and components, regulator maintenance (filter element and heater coil cleaning), heater unit removal and installation, louver removal, threaded insert removal, heater coil removal and installation, heater fan removal and installation, and heater valve removal and installation. Wiring for the fan switch and temperature switch is covered.

Specifications (SPEC-xx)

The specifications chapter closes out the manual with machine-specific data for both models. It includes conversions (decimal/millimeter equivalents and U.S. to metric), hydraulic connection specifications (O-ring face seal, straight thread O-ring, flare fitting, and port seal fitting with tightening torque charts), hydraulic fluid specifications, complete 321 excavator specifications, complete 323 excavator specifications, and torque specifications for general SAE and metric bolts. Each model’s specification section covers machine dimensions, working range, lift capacity, performance, function times, weights, controls, engine data, electrical data, hydraulic system data, hydraulic cylinder dimensions, drive system, traction, brakes, slew system, serviceability, fluid capacities, fluid specifications, environmental data, instrumentation, safety, standard features, options, and bucket attachment options.

Why This Manual Matters

The Bobcat 321 and 323 are compact machines, but they are not simple – they run a dual piston pump with a gear pump, a nine-spool control valve, pilot-operated joysticks, a two-speed travel system, an expandable undercarriage, and a Kubota diesel with a full injection pump and governor assembly. Working on any of that without the factory procedures is asking for trouble: wrong torque values, wrong hydraulic pressures, wrong disassembly sequences, and parts damaged during reassembly. This service manual gives you the exact procedures and specifications Bobcat technicians use, so a repair that should take a few hours does not turn into a comeback.

Whether you are doing routine 500-hour maintenance, diagnosing a travel circuit that will not hold on a slope, rebuilding a boom cylinder, chasing an electrical fault in the console lockout system, or pulling the engine for a full recondition, the answers are here. Every procedure is written for the machine on the bench, with figures that show the parts and their orientation, torque values where they matter, and testing procedures that tell you whether a component is within spec or needs replacement.

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Instant PDF Delivery

This is a digital download – no physical book, no shipping, no waiting. The PDF is delivered immediately after checkout and can be opened on any device: laptop, desktop, tablet, or smartphone. Print the pages you need for the job and keep the rest on file. If you own or service a Bobcat 321 or Bobcat 323 compact excavator, this is the reference you want in the shop.