1998–2004 JCB 407B ZX, 408B ZX, 409B Z, 410B ZX, 411B ZX Wheeled Loading Shovel Service Manual (P/N 9803/4210–08)

• Coverage and document identity: Official JCB Service Manual Publication No. 9803/4210-08, copyright 2004, for the 407B ZX, 408B ZX, 409B Z, 410B ZX, and 411B ZX articulated wheel loaders. The cover identifies the 409 as 409B Z, while many internal headings use 409B ZX. Supplied as an 11-file, 451-page PDF set.
• Serial-specific coverage separates electrical, hydraulic, filter, air-cleaner, and cooling-system configurations at key production breaks, including 755182/755183, 755490/755491, 757099/757100, 757399/757400, and 757599/757600. Manual and servo controls, early and late pump/motor layouts, and the 410B/411B systems are not treated as interchangeable.
• Body and frame repair procedures cover bonded cab glass, ROPS/FOPS inspection, cab removal, rivet-nut installation, quickhitch disassembly and assembly, loader-arm removal, pivot-seal fitting, and articulated-joint separation, inspection, bushing renewal, and shimming.
• Hydraulic diagnosis and repair includes model- and serial-specific circuit diagrams, main and auxiliary relief-valve testing, hydrostatic transmission setup, pump and drive-motor removal, pump and ram disassembly, control-valve service, hydrostatic fault charts, and Smooth Ride System accumulator service.
• Drivetrain, brake, and steering work covers both transmission-pump towing setups, front and rear axle service, drive-head and Maxtrac crownwheel-and-pinion setup, hub/driveshaft repair, transfer-gearbox teardown, brake-caliper repair and bleeding, parking-brake adjustment, steering-unit overhaul, priority-valve service, and pressure testing.
• Electrical and maintenance reference provides multimeter methods, battery/alternator/starter diagnosis, starter overhaul, fuse and relay layouts, serial-specific circuit and harness drawings, scheduled service procedures, approved fluids and capacities, torque tables, and JCB special tools with part numbers.

Repair Coverage by Configuration

This is a factory workshop manual, not a maintenance-only booklet. The electrical diagrams are organized around production changes: machines to Serial No. 755182 and from 755183, the 410B change at 755490/755491, and the 407B-409B change at 757100. Late-machine coverage adds mainframe, cab, and front-chassis harness layouts, wire-number identification, and branch-and-connector drawings.

Hydraulic coverage follows the actual machine build. It separates servo and manual 408B/409B circuits through Serial No. 757099, 407B-409B systems from 757100, and 410B/411B circuits before and after 757600. The schematics identify the hydrostatic drive, forward/reverse and range valves, steering priority and brake-pressure defeat circuits, quickhitch and auxiliary services, plus optional hose-burst protection, creep-speed, and Smooth Ride equipment.

Component Repair Depth

The axle and transfer sections go beyond removal and installation. They document drive-head teardown, pinion-depth calculation, bearing preload, backlash and tooth-contact checks, hub/driveshaft assembly, in-place pinion-seal renewal, transmission fault finding, and transfer-gearbox setup. Separate procedures address the 407B-409B hub arrangement, the 410B planetary hub, and the 411B axle, hub, and brake configuration.

The manual flags costly assembly traps. Crownwheel-and-pinion sets and differential case halves are matched; mixing components or reusing a collapsible spacer after preload has been exceeded can lead to incorrect gear contact and premature failure. During steering-unit repair, spool-and-sleeve timing marks and preset shock-valve settings must be preserved or the rebuilt unit may be incorrectly timed or misadjusted.

Maintenance, Specifications, and Tooling

Section 1 covers VIN decoding, machine and engine identification, standard torque data, and special tools. Routine-maintenance coverage runs from pre-start checks through the factory hour-based service schedule. Separate lubricant and capacity tables are supplied for North America and for the 407B-409B versus 410B/411B groups. The manual also records serial-dependent changes in hydraulic fluid specification at 757367 and filter, air-cleaner, and cooling-system arrangements around 757400.

Reference data includes BSP adapter, hose-end, flange, and high-tensile fastener torque tables; hydraulic pressure and flow checks; axle and gearbox setup data; electrical test values; brake and steering specifications; and approved sealing compounds. Listed JCB tools include the 892/00253 hydraulic pressure-test kit, 892/00268 flow-monitoring unit, 892/00180 steering seal-fitting tool, 892/00833 annulus-removal tool, 992/04000 torque multiplier, and 992/07000 quickhitch peg spanner.

Representative drawings include the Machines to Serial No. 755182 electrical circuit, Mainframe Harness - 407B ZX, 408B ZX, 409B ZX from Serial No. 757100, the early 408B/409B Servo hydraulic circuit, the Smooth Ride System Electrical Schematic, the Drive Head - Front Axle exploded view, and articulated-joint inspection and shim views.

Engine Scope and Safety

Section K provides engine identification and technical data for the Perkins 1004-series variants, including 1004-4LR2, 1004-4HR, 1004-4, TN440/1004-4 TLR2, and later AS/AQ builds. It does not contain a full internal engine overhaul chapter; further engine repair is referred to separate publications 9806/0100 and 9806/2140, which are not included in this PDF set.

Before repair work begins, follow the manual's articulation-lock and loader-arm safety-strut procedures and relieve hydraulic or accumulator pressure. The articulated chassis, raised loader arms, and high-pressure fluid circuits create crushing and injection hazards.