JLG 8042, 10042, and 10054 Telehandler Service Manual (P/N 8990396 C)
906 Pages • 56.96 MB • Instant, Printable PDF
JLG Models Covered & Key Technical Specifications
Models: 8042, 10042, 10054
Sub-models / Variants: Open Cab, Enclosed Cab (Optional)
Model Years: 2003–2007
Serial Numbers: 8042: 13198–19987, 0160002332–0160029592; 10042: 13198–19987, 0160002332–0160029592; 10054: 13198–19987, 0160002332–0160029592
Technical Data:
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Max lift height: 41' 11" (8042), 42' 1.5" (10042), 53' 2" (10054)
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Engine types: Cummins 4BT3.9/4BTA3.9 Turbo and Cummins QSB4.5T
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Transmission: ZF 4 WG-98 TC
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Operating load: 8,000 lb (8042), 10,000 lb (10042/10054)
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Max travel speed: 20 mph (32.2 km/hr)
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Electrical system: 12 VDC, negative ground, 95 A alternator
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Fuel capacity: 37 gal (140 liters)
JLG Manual Features & Content Preview
- Comprehensive coverage for the 8042, 10042, and 10054 Legacy-series telescopic material handlers (open and enclosed cab configurations).
- Official OEM JLG publication P/N 8990396 C (published February 2007).
- 906 pages of factory-level specifications, component terminology, and detailed maintenance sequences.
- Includes high-resolution electrical and hydraulic schematics for the Stabil-TRAK and boom interlock systems.
Shop Floor Utility and System Diagnostics
When a piece of heavy equipment goes down in the bay, fast and accurate diagnostics are critical to getting it back out and earning money. This 11-chapter factory reference cuts out the guesswork by breaking down the main chassis, boom assemblies, and drivetrain for professional, component-level service. You get targeted engine data for both the Cummins 4BT/4BTA 3.9L and QSB 4.5T powerplants, alongside comprehensive teardown and maintenance overviews for the ZF 4 WG-98 TC transmission. Because heavy telehandlers operate under massive hydraulic pressures and physical loads, it is crucial to review all operational hazards and proper lifting protocols outlined in the initial safety chapters before turning any wrenches. The guide also covers extensive electrical diagnostics, comprehensive hydraulic system testing, and proprietary Stabil-TRAK system calibration.
Quick Reference Specifications
Rather than digging through generic forums for baseline values, this documentation delivers the exact OEM numbers directly to your workbench. The technical data section outlines essential capacities, specifying the 64-gallon hydraulic system for the 10042 and 10054 units. It details critical tightening sequences, such as the 430–470 lb-ft torque requirement for wheel lug nuts, ensuring structural maintenance meets factory standards. You also get clear performance baselines, noting a maximum lift height of 53' 2" for the 10054 model and a unified max travel speed of 20 mph across the range. Designed specifically for experienced DIYers, technicians, and professional mechanics, this document provides the exact factory data required to maintain these legacy JLG lifts safely and efficiently.
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