JLG 3369LE 4069LE M3369 M4069 Scissor Lift Service and Maintenance Manual – 2020
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Complete service and maintenance manual for JLG 3369LE, 4069LE, M3369, and M4069 scissor lifts. Covers specifications, hydraulic and electrical systems, JLG control system diagnostics, chassis and scissor arms, torque hubs, cylinders, and more. 158 pages. Rev A, March 2020.
Description
File Details
- Manual Type: Service and Maintenance Manual
- Brand: JLG
- Models Covered: 3369LE, 4069LE, M3369, M4069
- Document Number: 31217135
- Revision: Rev A
- Date: March 13, 2020
- Language: English
- Page Count: 158 pages
- File Format: PDF
Chapters Covered
- Section 1 — Specifications: Engine specifications, component data, dimensional data, battery charger, batteries, drive system, steer system, hydraulic pump/electric motor assembly, tires, engine (generator), capacities, pressure settings, torque specifications, cylinder specifications, major component weights, critical stability weights, lubrication, serial number locations, thread locking compound, SAE and metric fastener torque charts
- Section 2 — General: Machine preparation, inspection and maintenance, pre-start inspection, pre-delivery inspection and frequent inspection, annual machine inspection, preventative maintenance, service and guidelines, safety and workmanship, cleanliness, component removal and installation, component disassembly and reassembly, pressure-fit parts, bearings, gaskets, bolt usage and torque application, hydraulic lines and electrical wiring, hydraulic system, lubrication, battery, lubrication and servicing, cylinder drift test, pins and composite bearing repair guidelines, preventive maintenance and inspection schedule
- Section 3 — Chassis & Scissor Arms: Calibrations (elevation sensor, speed sensor, tilt sensor, joystick), tilt sensor removal and installation, battery maintenance and charging, battery charger (Delta-Q), battery charger troubleshooting, battery algorithms, battery temperature sensor, generator (RBS/CTS timing sequences, alternator, dynamo, control fuse, start battery, engine starter, start control relay, fuel control relay, fuel solenoid, engine oil temperature sensor, alternator output current sensor, engine speed sensor, engine low oil pressure switch, alarms and fault flash codes, priming the fuel line), supplementary fuse for APU, joystick controller, towing (disengaging/engaging), drive hub, drive brake (MICO), torque hub
- Section 4 — Hydraulics: Servicing and maintenance guidelines, lubrication information, cylinders — theory of operation, valves — theory of operation, component functional description (hydraulic pump, manual descent, wear pads), motor controller — modes of operation, features, cylinder checking procedures, cylinder removal and installation, cylinder repair, steer cylinder removal, oscillation cylinder bleeding, oscillating axle — lockout cylinder test, cylinder assemblies (lift cylinder 3369LE/M3369 and 4069LE/M4069, leveling jack cylinder, steer cylinder, oscillating axle cylinder), pressure setting procedures (main relief at pump, lift relief, steer relief), drive torque hub, drive assist valve
- Section 5 — JLG Control System: Hand held analyzer (connecting, using, changing access level, adjusting parameters, machine setup), PC boards, flash codes/DTC’s and descriptions, ground control circuit board (software version P1.6), J1 through J6 connector tables, analyzer flow charts
- Section 6 — General Electrical Information & Schematics: General, multimeter basics (grounding, backprobing, min/max, polarity, scale, voltage measurement, continuity measurement, current measurement, continuity measurement over long distances), applying silicone dielectric compound to AMP connectors, dielectric grease application (AMP Mate-N-Lok, AMP Faston, AMP Micro-Fit, AMP Mini Fit Jr, Mini Fit Sr, DIN connectors, exceptions), AMP connector assembly and disassembly, working with Deutsch connectors (DT/DTP series, HD30/HDP20 series), electrical schematics (all except AUS, AUS), hydraulic schematics (all except CE, CE)
This JLG 3369LE 4069LE M3369 M4069 service and maintenance manual is the complete technical reference for professional and owner-level servicing of these scissor lift models. Across 158 pages, it delivers the specifications, procedures, and diagnostic information needed to maintain, troubleshoot, and repair the machine’s major systems. From the Kubota diesel generator and Delta-Q battery charger to the torque hubs, drive brakes, hydraulic cylinders, and JLG control system, the manual covers every major assembly with step-by-step instructions and factory specifications. The electrical and hydraulic schematics provide the circuit-level detail required to trace faults and verify system operation, while the flash code and DTC tables allow efficient diagnosis through the JLG analyzer.
What This Manual Helps You Do
Whether you are performing routine maintenance, diagnosing a fault, or rebuilding a major component, this manual provides the procedures and specifications to do the job correctly. Key capabilities include:
- Calibrate critical sensors: Follow the elevation sensor, speed sensor, tilt sensor, and joystick calibration procedures to restore proper machine function after component replacement or when fault codes indicate calibration issues.
- Diagnose electrical and control faults: Use the flash codes/DTC tables, analyzer flow charts, and connector pinout tables to pinpoint issues in the JLG control system, power module, and ground control board.
- Service hydraulic systems: Access cylinder checking procedures, pressure setting procedures, valve component torque values, and hydraulic schematics for the lift, steer, and oscillating axle circuits.
- Repair drive and brake assemblies: Disassemble and reassemble the drive hub, MICO drive brake, and torque hub with detailed exploded views and torque specifications.
- Maintain the generator (if equipped): Troubleshoot RBS/CTS timing sequences, flash codes, fuel line priming, and component descriptions for the Kubota diesel generator system.
- Charge and maintain batteries: Understand Delta-Q battery charger operation, algorithm selection, fault code troubleshooting, and battery maintenance procedures.
- Follow preventive maintenance schedules: Use the inspection and maintenance tables to establish a comprehensive service program with proper intervals.
Why This Manual Matters
JLG scissor lifts are complex machines with integrated hydraulic, electrical, and control systems. Using incorrect procedures or specifications can lead to component damage, system faults, or unsafe operating conditions. This manual provides the exact torque values, pressure settings, calibration steps, and diagnostic procedures specified by the manufacturer for the 3369LE, 4069LE, M3369, and M4069 models. The electrical and hydraulic schematics are essential for efficient troubleshooting, and the step-by-step repair procedures help ensure that components are disassembled, inspected, and reassembled correctly. For anyone responsible for maintaining these machines, this manual is an indispensable reference.
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This JLG 3369LE 4069LE M3369 M4069 Scissor Lift Service and Maintenance Manual is delivered as an instant PDF download after purchase. No shipping, no waiting. The file can be viewed on any device — computer, tablet, or smartphone — and specific pages or sections can be printed for use in the workshop. Keep it on hand for reference during maintenance, repair, and diagnostic work.
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