Doosan G20N-7 G25N-7 G30N-7 G33N-7 G35NC-7 Forklift Service Manual

Description

Doosan G20N-7 / G25N-7 / G30N-7 / G33N-7 / G35NC-7 Forklift Service Manual

This Doosan G20N-7 G25N-7 G30N-7 G33N-7 G35NC-7 Forklift Service Manual is the complete vehicle service document for the seventh-generation Doosan LP gas counterbalance forklift range. Published by Doosan Corporation Industrial Vehicle, this manual explains the vehicle system and provides step-by-step disassembly, assembly, inspection, testing and troubleshooting instructions for every major system on the truck. It is written for professional service engineers and mechanics who maintain and repair these machines, and it covers the powertrain, drive axle, hydraulic system, lift/tilt/auxiliary systems, steering, brakes, frame and the optional fingertip control package.

Every procedure in this Doosan forklift service manual is supported by exploded diagrams, cutaway illustrations, hydraulic circuit drawings and electrical schematics so that components can be identified quickly during teardown and rebuild. Torque values, clearances, pressure readings, flow rates and adjustment specifications are printed alongside the procedures that use them.

File Details

• Manual type: Vehicle Service Manual
• Brand: Doosan (Doosan Corporation Industrial Vehicle)
• Models covered: G20N-7, G25N-7, G30N-7, G33N-7, G35NC-7
• Document number: SB4466E02
• Edition / revision: Revision 2, supersedes SB4466E01
• Publication date: August 2019
• Language: English
• File format: PDF

Chapters Covered

• 1 General – How to use this manual, warning label definitions, major units, glossary, exterior and specifications, safety precautions, maintenance intervals, lubricants and LP fuel specifications, disassembly/assembly instructions, standard torques
• 2 Transmission – Powertrain overview, torque converter, converter stall test, transmission body, hydraulic section, pressure tests, inching pedal adjustment, engine-transmission removal, housing disassembly, output/input/counter gear assemblies, valve assembly, transmission electric control system, troubleshooting
• 3 Drive Axle – Components and power flow, lubrication flow, tools, tightening torques, drive wheel removal, U-joint, drive axle removal, wheel hub assembly, brake cover assembly, axle hub, shaft and spindle, differential assembly, bevel pinion, differential carrier, differential disassembly, troubleshooting
• 4 Hydraulic System – Components, oil flow, main hydraulic pump (removal, disassembly, assembly), flow divider and priority valve operation, hydraulic tank and filter, suction strainer, return filter, air breather replacement, troubleshooting
• 5 Lift / Tilt / Auxiliary System – Control valve, relief valve setting, needle valve emergency lowering, flow rate adjustment, mast assembly, forks service, sideshifter service, chain service, tilt cylinders, primary lift cylinders, standard/secondary cylinders, carriage service, mast service, troubleshooting
• 6 Steering System – Steering control group, steering unit, air removal, pressure check, steering wheel, steering column cover, steering unit removal, steering operation group, rear wheel and hub, steer axle, steering link, knuckle, steering cylinder, troubleshooting
• 7 Brake System – Components, hydraulic and mechanical power flow, service brake assembly, brake pedal, master cylinder, brake bleeding, parking brake, adjustment, brake test, troubleshooting
• 8 Frame / Miscellaneous – Hood, floor plate, cabin and overhead guard, counterweight, ground speed control, OSS controller, automatic shift controller (ASC), heating system, muffler
• 9 Fingertip Option – Overview, fingertip extension module, fingertip armrest unit, fingertip control valve, EasyView application, fault diagnosis
• 10 Schematics – Hydraulic schematic, fingertip hydraulic schematic, electrical schematic

In practice, this service manual gives a technician everything needed to strip, inspect, reseal and re-time the powertrain; rebuild the differential and wheel hubs; service the control valve and mast hydraulics; bleed and adjust the service and parking brakes; and diagnose electrical faults across the OSS, ASC and fingertip control networks. Transmission pressure tests, torque converter stall tests, brake drift tests, chain wear measurements and cylinder drift tests are all documented with reference values so that wear and internal leakage can be pinpointed rather than guessed at.

Systems and Repair Procedures You Can Perform With This Manual

• Torque converter stall test and transmission pressure testing
• Transmission housing, bearing plate and gear assembly teardown and rebuild
• Differential carrier, bevel pinion preload and crown wheel backlash adjustment
• Wheel hub, brake cover, axle hub and spindle service
• Main hydraulic pump disassembly, seal replacement and reassembly
• Control valve relief valve setting, flow rate adjustment and section block service
• Mast, carriage, chain, tilt cylinder and lift cylinder service with drift test procedures
• Steering unit disassembly, steering cylinder service and steer axle removal
• Service brake master cylinder overhaul and brake bleeding
• Parking brake adjustment and brake performance testing
• OSS controller, automatic shift controller and ground speed control setup
• Fingertip option calibration, EasyView diagnostics and fault code lookup

Why This Doosan Forklift Service Manual Matters

These G-series LP trucks share common architecture across five capacity ratings, but the pressure settings, relief valve values, torque figures and roller bearing sizes differ between them. Working from an incorrect value can damage a clutch pack, glaze a brake disc or cause a mast to drift. The Doosan G20N-7 G25N-7 G30N-7 G33N-7 G35NC-7 Forklift Service Manual prints the correct figure for each model alongside the procedure, so the wrench in your hand and the specification in front of you always match the truck on the floor.

The manual also includes the fingertip option chapter, covering the electronically controlled control valve, the armrest knobs, the F/R switch, the unloading and lowering lock solenoid valves and the EasyView PC application used for parameter calibration, cloning and fault history review. That is the section most third-party documentation leaves out entirely.

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Instant PDF Delivery

This Doosan service manual is supplied as an instant-download PDF. There is no shipping, no waiting for a physical book and no restriction on where you open it — workshop PC, laptop, tablet or phone. Pages can be printed for the bay or kept on a screen next to the machine. Once the order is placed, the file is available to download immediately and can be re-downloaded whenever you need it.