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JLG 642, 742, 943, 1043, 1055, 1255 Service Manual with Wiring Diagrams

$39.99

Model: 642 | 742 | 943 | 1043 | 1055 | 1255
Type: Telehandler
566 Pages·41 MB·Searchable PDF·English·Print-Ready
  • ✓ Wiring Diagrams
  • ✓ Hydraulic Schematics
  • ✓ Torque Specs
  • ✓ Multi-Level Bookmarks (3-level navigation)
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JLG 642, 742, 943, 1043, 1055, 1255 cab harness electrical schematic diagram for units prior to serial number 0160093271
JLG 642, 742, 943, 1043, 1055, 1255 Service Manual with Wiring Diagrams
$39.99

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Boom, cab, axles, transmission, engine, hydraulics and electrical: this 566-page JLG 1255 service manual PDF (OEM ID 31211033) walks each system end to end across six JLG telehandlers, 642 through 1255. Full hydraulic schematics trace flow from the implement pump through the control valves to each cylinder, and separate harness schematics for the 642 to 1043 group and the 1055/1255 keep your wiring traces on the right frame. More than a third of the book is fault code listings (machine codes, engine SPN and aftertreatment faults), so a code on your display leads straight to its cause. Set total wear pad gap to 0.019 to 0.059 in (0.5 to 1.5 mm) against the next boom section, then torque the reservoir drain plug to 22 to 29 lb-ft (30 to 40 Nm). A made-up torque figure on a loaded boom hurts people. Bookmarked and text-searchable, the PDF is yours to keep for the life of that machine.

What's Inside This JLG 642–1255 Telehandlers Manual

SystemPagesKey Topics
Safety Practices9-12Introduction, Disclaimer, Operation & Safety Manual, Do Not Operate Tags, Safety Information (Safety Alert System and Signal Words)
General Information and Specifications13-98Replacement Parts and Warranty Information
Boom99-144Boom System Component Terminology, Boom System, Boom Removal/Installation, Boom Assembly Maintenance - 642, 742, 943, 1043, Third Boom Section Removal/Installation Only - 642
Cab145-158Operator Cab Component Terminology, Operator Cab, Cab Components, Cab Removal, Cab Installation
Axles, Drive Shafts, Wheels and Tires159-174Axle, Drive Shaft and Wheel Component Terminology, Axle Serial Number, Axle Specifications and Maintenance Information, Axle Replacement, Brake Inspection
Transmission175-182Transmission Assembly Component Terminology, Transmission Serial Number, Specifications and Maintenance Information, Transmission Replacement, Transmission Fluid/Filter Replacement
Engine183-210Introduction, Engine Serial Number, Specifications and Maintenance Information, Engine Cooling System, Engine Electrical System, Fuel System, Engine Exhaust System
Hydraulic System211-270Hydraulic Component Terminology, Safety Information, Specifications, Hydraulic Pressure Diagnosis, Hydraulic Circuits, Hydraulic Schematic, Hydraulic Reservoir, Implement Pump
Electrical System Overview and Power Distribution271-286Electrical Component Terminology, Power Distribution Boards, Cab Power Distribution, Frame Power Distribution, Engine Harness Fuses and Relays
Electrical System Schematics (642, 742, 943, 1043)287-293Cab Harness Schematics, Engine Harness Schematics, ULS Engine Harness, Option Harnesses
Electrical System Schematics (1055, 1255)294-308ULS Engine Harness, LS Engine Harness, Option Harnesses, Cab Harness Schematics
Multifunction Display and Setup309-348Multifunction Display, Setup and Maintenance, Access Levels, Programming, Capacity Charts
Machine Fault Codes (00x - 46x)349-495Help Comment, Power Up, Platform Controls, Cabin Controls, Output Drivers, Transmission and Drive System
Engine Diagnostics and Fault Codes (SPN)496-566Engine Diagnostic, SPN Fault Codes, Aftertreatment System, Engine Sensors, Communication Faults

Quick Reference Specifications

SpecificationValuePage
All Models
Hydraulic oil reservoir drain plug torque22 - 29 lb-ft (30 - 40 Nm)p. 246
Acceptable total gap between the side/top wear pad(s) and the next boom section0.019 - 0.059 in (0,5 - 1,5 mm)p. 132
Bolt length tolerance± 0.004 in (±1,0 mm)p. 133
Engine coolant temperature sensor torque12.5 - 17 lb-ft (17 - 23 Nm)p. 362
Boom angle sensor rod length8.26 - 8.34 in (210 - 212 mm)p. 363
Wheel lug nut torque350-400 lb-ft (475-542 Nm)p. 21
Engine Crankcase Oil Capacity (with filter change)14 quarts (13,2 liters)p. 25
Fuel Tank Capacity38.3 gallons (145 liters)p. 25
642
Hydraulic System Capacity (642, No Outriggers)40.2 gallons (152 liters)p. 25
Hydraulic System Capacity (642, With Outriggers)41.7 gallons (158 liters)p. 25
943
Hydraulic System Capacity (943)46.5 gallons (177,0 liters)p. 26
1043
Hydraulic System Capacity (1043)48.6 gallons (184,0 liters)p. 26
BrandJLG
Model642, 742, 943, 1043, 1055, 1255
Machine TypeTelehandler
Manual TypeService Manual
LanguageEnglish
FormatSearchable PDF (Digital Download)
Pages566
File Size41 MB
Manual No.31211033
Wiring DiagramsYes
Hydraulic SchematicsYes
Torque SpecificationsYes
Bookmarked / IndexedYes
SKU: JLG-64274294310431055125-SVC-E89D5 Categories: , Tags: , , , , , , Brand:

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