Doosan D20S-7 D25S-7 D30S-7 D33S-7 D35C-7 Tier-4 Forklift Service Manual – SB4465E00

Description

Doosan D20S-7 D25S-7 D30S-7 D33S-7 D35C-7 Tier-4 Forklift Service Manual

This Doosan D20S-7 D25S-7 D30S-7 D33S-7 D35C-7 Tier-4 Forklift Service Manual is the complete vehicle service manual for the Doosan D20S-7, D25S-7, D30S-7, D33S-7, and D35C-7 Tier-4 forklift models. Published by Doosan Corporation Industrial Vehicle in March 2017 as document SB4465E00, this 430-page PDF gives technicians, mechanics, and fleet maintainers the full system-by-system procedures, specifications, and diagnostics needed to keep these forklifts running correctly.

Whether you are servicing the D24NAP Tier-4 diesel engine, rebuilding the powershift transmission, overhauling the drive axle, or tracing a hydraulic fault through the control valve, this service manual provides the factory procedures and reference values for the job. Every chapter includes component descriptions, disassembly and assembly steps, torque values, inspection criteria, and troubleshooting charts written for the specific D20S-7 through D35C-7 platform.

File Details

• Manual type: Vehicle Service Manual
• Brand: Doosan
• Models covered: D20S-7, D25S-7, D30S-7, D33S-7, D35C-7 (Tier-4)
• Engine: D24NAP Tier-4 diesel, 2.4 L D24A
• Language: English
• Page count: 430 pages
• File format: PDF
• Document number: SB4465E00
• Publication date: March 2017
• Revision: SB4465E00 (Apr 26, 2017)

Chapters Covered

• General – How to use this manual, warning label definitions, major units, glossary, exterior and specifications, safety precautions, maintenance, lubricants, disassembly/assembly instructions, standard torques for bolts, nuts, and fittings
• Transmission – Powertrain components and power flow, torque converter operation and stall test, transmission body, mechanical and hydraulic operation, pressure test, inching pedal adjustment, engine-transmission removal and installation, housing disassembly and assembly, output gear assembly, input/counter gear assembly, valve assembly, electric control system, ECT option, troubleshooting
• Drive Axle – Components and power flow, lubrication flow, service tools, tightening torques, lubrication parts, drive axle body, wheel hub assembly, differential assembly, bevel pinion, troubleshooting
• Hydraulic System – Components and oil flow, main hydraulic pump, flow divider, hydraulic tank and filter, suction strainer and return filter replacement, troubleshooting
• Lift/Tilt/Aux System – Components and oil flow, control valve, relief valve settings, needle valve emergency lowering, flow rate adjustment, mast assembly, forks, sideshifter, chains, tilt cylinders, primary lift cylinders, standard/secondary lift cylinders, carriage, mast service, troubleshooting
• Steering System – Components and oil flow, steering control group, steering unit, steering operation group, rear wheel and hub, steer axle, steering link and knuckle, steering cylinder, troubleshooting
• Brake System – Components, hydraulic and mechanical power flow, service brake assembly, brake pedal, master cylinder, parking brake, troubleshooting
• Chassis / Miscellaneous – Hood, floor plate, cabin and overhead guard, counterweight, ground speed control, OSS controller, ASC/ASLC, cooling and heating systems
• Schematics – Hydraulic schematic, electrical schematic

What This Service Manual Covers

The Doosan D20S-7 D25S-7 D30S-7 D33S-7 D35C-7 Tier-4 Forklift Service Manual is organized by vehicle system so you can go straight to the section you need. Each chapter opens with an overview of how that system works, followed by removal, disassembly, inspection, assembly, and installation procedures written for the specific Tier-4 models. Torque specifications, clearances, pressure values, and adjustment ranges are given in both metric and imperial units throughout.

The transmission chapter covers the torque converter, powershift transmission body, hydraulic control section, and electronic control system including the ECT option with fault diagnosis mode and parameter list. The drive axle chapter walks through the wheel hub assembly, differential carrier, bevel pinion, and differential assembly with tightening torques for each fastener. The hydraulic chapter covers the main hydraulic pump, flow divider, priority valve operation, and hydraulic tank service.

The lift/tilt/auxiliary chapter is the largest section, covering the control valve block-by-block, mast assemblies for STD, FFL, FFT, and QUAD configurations, forks, sideshifter, chains, tilt cylinders, and all lift cylinder types with service procedures and drift tests. The steering chapter covers the steering unit, steer axle, knuckle and king pin, and steering cylinder. The brake chapter covers the service brake, master cylinder, and parking brake with adjustment and testing procedures.

Beyond the major systems, the chassis chapter covers the hood, floor plates, cabin modules, counterweight, ground speed control, OSS controller, ASC/ASLC, and the cooling and heating systems. The schematics chapter provides the hydraulic and electrical schematics for reference during diagnosis.

Specifications and Reference Data

This manual includes the specification tables you need to work accurately. Engine data such as the D24NAP Tier-4 diesel with 2.4 L displacement, valve clearance settings, and torque converter stall test values are given with model-specific figures. Transmission pressures, clutch pressures, lubrication pressures, and converter charge pressures are listed for both neutral and forward/reverse operation. Drive axle reduction ratios, differential gear ratios, and bearing preload values are included with adjustment procedures.

Hydraulic system specifications cover pump displacement, maximum pressure, relief valve settings, and flow control ranges. Steering system specifications include relief pressure, displacement, and rated flow. Brake system specifications cover master cylinder stroke, brake oil flow, and relief valve cracking pressure. Where a value differs between models, the manual gives separate figures for D20S-7, D25S-7, D30S-7, D33S-7, and D35C-7 so you apply the correct specification for the machine in front of you.

Maintenance and Safety

The general section lays out the maintenance intervals and inspection criteria for the D20S-7 through D35C-7 forklifts, from daily checks through 2,500-hour service. Lubricant specifications, recommended viscosities, and refill capacities are provided, along with the diesel fuel requirements including bio-diesel guidance for the D24NAP Tier-4 engine. Safety precautions cover personal safety, hydraulic fluid hazards, compressed air hazards, mechanical hazards, and fire and burn hazards, so technicians understand the risks before starting work.

The standard torque tables for metric and inch fasteners, O-ring face seal fittings, flared fittings, and hose clamps give the correct tightening values. Disassembly and assembly instructions cover bearing handling, oil seal installation, retaining rings, gaskets, O-rings, and hydraulic line fittings, with guidance on cleaning, inspection, and reassembly.

Who This Manual Is For

This Doosan D20S-7 D25S-7 D30S-7 D33S-7 D35C-7 Tier-4 Forklift Service Manual is written for professional forklift technicians, fleet maintenance departments, and equipment owners who need to service or repair these models. It assumes the reader has mechanical knowledge and access to the tools specified in each procedure. It is a service manual, not an operator’s manual – it does not cover day-to-day operation or operator training.

If you maintain a fleet of Doosan Tier-4 forklifts across these five models, this single manual covers the shared and model-specific procedures so you are not hunting for information across multiple documents. The schematics and specifications make it useful for troubleshooting as well as planned maintenance and overhaul work.

Get the Complete Doosan Tier-4 Forklift Service Manual

With this Doosan D20S-7 D25S-7 D30S-7 D33S-7 D35C-7 Tier-4 Forklift Service Manual, you can diagnose faults accurately, disassemble and reassemble components correctly, and apply the right torque and pressure values the first time. The manual covers the full service scope from routine maintenance to major repairs on the transmission, drive axle, hydraulic system, mast, steering, and brakes.

Delivery is instant – you receive the PDF immediately after purchase, with no shipping and no waiting. The file works on any device, so you can view it on a laptop in the workshop, on a tablet at the machine, or print the pages you need for the job. Whether you are servicing one forklift or maintaining a fleet, this service manual gives you the information to do the work properly.

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