JLG 600S 600SJ 660SJ Illustrated Parts Manual 3120720 Rev AP – PDF Download

Description

JLG 600S 600SJ 660SJ Illustrated Parts Manual 3120720 Rev AP

This complete JLG 600S, 600SJ, and 660SJ Illustrated Parts Manual (JLG document 3120720, revision AP, dated September 14, 2018) is your definitive visual guide to identifying and ordering replacement parts for these boom lift models built prior to serial number 0300068000. With 374 pages of exploded-view illustrations, detailed part number callouts, and comprehensive parts lists, this PDF manual gives you the same parts reference used by professionals to keep these machines running reliably.

File Details

• Manual Type: Illustrated Parts Manual
• Brand: JLG
• Models Covered: 600S, 600SJ, 660SJ
• Serial Number Range: Prior to SN 0300068000
• Document Number: 3120720
• Revision: Rev AP
• Date: September 14, 2018
• Language: English
• Page Count: 374 pages
• File Format: PDF

Chapters Covered

• Section 1 – Frame: 2WD Front Axle and Steering Installations, 4WD Front Axle and Steering Installations, 4WS Rear Steering Installations, Tire and Wheel Drive Installations, Drive Hub Assembly (Prior to SN 0300064395), Drive Hub Assembly (SN 0300064395 through 0300068000), Drive Brake Assembly, Drive Motor Assembly – Rexroth, Drive Valves and Shields Installation, Tow Package Installation
• Section 2 – Turntable: Control Valves Installations, Main Control Valve Assembly, Accessory Valve Assembly, Swing Drive, Turntable Bearing and Lock Installations, Swing Hub Assembly, Swing Brake Assembly, Swing Motor Assemblies, Continental Engine Installation, Generator Installation – Continental Engine, Deutz Engine Installation, Deutz Engine Installation with Noise Reduction, Generator Installation – Deutz Machines, 7500W SkyPower Generator Installation – Deutz Machines, Ford Engine Installations – LRG423, Ford Engine Installations – LRG425 with Carburetor, Ford Engine Installations – LRG425 with EFI, Dual Fuel Installations, Generator Installation – Ford Machines, Isuzu Engine Installation – 4JB1, Piston Pump Assembly, Gear Pump Assembly, Tank Installations, Rotary Coupling Installation, Ground Control Box Assembly, Ground Control Box Assembly (ADE System), Electrical Options Installation, Engine Tray Jack Installation, Hoods and Lifting Plate Installations
• Section 3 – Boom: Boom Installations – 600S, Boom Installations – 600SJ & 660SJ, Main Boom Assemblies, Rotator Assemblies (Front Entry Platform), Rotator Assemblies (Side Entry Platform), Power Track Installations – Plastic Track, Power Track Installations – Steel Track
• Section 4 – Platform: Platform Components Installation (Front Entry), Platform Components Installation (Side Entry), Platform Console Assembly (Prior to SN 0300061927), Platform Console Assembly (ADE System), Controller Assembly (Swing and Lift), Controller Assembly (Drive and Steer), Soft Touch System Installation, SkyWelder Installation, Welder Assembly
• Section 5 – Cylinder: Axle Lockout Cylinder Assembly, Level Cylinder Assembly (Platform Slave) – 600S, Level Cylinder Assembly (Platform Slave) – 600SJ & 660SJ, Lift Cylinder Assembly (Boom), Lift Cylinder Assembly (Jib) – 600SJ & 660SJ, Master Cylinder Assembly, Steer Cylinder Assembly, Telescope Cylinder Assembly, Cylinder Bellows Installations
• Section 6 – Hydraulic: Hydraulic Diagram – Drive and Steer (2WD/2WS), Hydraulic Diagram – Drive and Steer (4WD/2WS), Hydraulic Diagram – Oscillating Axle, Hydraulic Diagram – Standard, Hydraulic Diagram List
• Section 7 – Electrical: Electrical Diagram List, Harness Components Installation (Prior to SN 0300061927), Harness Components Installation (ADE System)
• Section 8 – Decals: Decals Installation – Standard, Decal Installation – Country Spec
• Section 9 – Recommended Service Parts Stock: Standard Parts, Variable Parts
• Section 10 – Special Options: Miscellaneous Special Options, Filter Kits, Tools for Service, Tool (Hydraulic) Installations, Weld Leads to Platform Installation
• Part Number Index

What makes this JLG 600S 600SJ 660SJ parts manual genuinely useful is the way it pairs every exploded-view illustration with a corresponding parts list. Each list gives you the item number, part number, quantity, and description, so you can trace exactly which component you need and order it with confidence. The Part Number Index at the back of the manual lets you start with a part number and jump straight to the page where it appears, which is invaluable when you’re working from a parts tag or a previous order.

The manual covers all major systems across the 600S, 600SJ, and 660SJ models. In the frame section you’ll find the complete breakdowns for front and rear axle assemblies, steering components, drive hubs, drive brakes, Rexroth drive motors, and frame-mounted drive valves. The turntable section is equally thorough, covering control valves, swing drives, turntable bearings, swing hubs, swing brakes, and swing motors. Engine installations for Continental, Deutz, Ford, and Isuzu powerplants each get their own detailed parts listings, including the generator installations and dual fuel configurations where applicable.

Hydraulic systems are documented through detailed diagrams for drive and steer configurations, oscillating axle circuits, and standard hydraulic layouts. The cylinder section provides complete parts breakdowns for axle lockout, level, lift, master, steer, and telescope cylinders, along with bellows installations. Electrical coverage includes harness components for both pre-ADE and ADE system machines, with connector and terminal details that make troubleshooting and repair more straightforward.

Whether you’re a professional equipment mechanic, a fleet maintenance manager, or an owner-operator who prefers to handle your own repairs, this JLG 600S, 600SJ, and 660SJ Illustrated Parts Manual gives you the exact part numbers and visual references you need. The exploded views make it easy to see how components fit together, so you can disassemble, inspect, and reassemble systems without guesswork. The detailed parts lists ensure you order the correct parts the first time, avoiding costly delays and return shipping.

This PDF manual is available for instant download after purchase. There’s no shipping, no waiting for a physical book to arrive, and no risk of a damaged or lost package. You can view it on any device — computer, tablet, or smartphone — and print the pages you need for the shop floor. Keep it on your hard drive or cloud storage for quick reference whenever a repair or maintenance task comes up.

With 374 pages covering every major system and serial-number-specific variations, this JLG 600S 600SJ 660SJ Illustrated Parts Manual (3120720 Rev AP) is the definitive parts reference for machines built prior to SN 0300068000. Don’t waste time hunting for part numbers in outdated resources — get the complete, current manual and keep your equipment running reliably.