Doosan G30P-5 Service Manual

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SB2349E10

FORKLIFTS

D20S-5, D25S-5, D30S-5, D33S-5, D35C-5

FDA04, FDA05, FDA06, FDA07, FDA08 (Yanmar 3.3L/3.0L Tier-3)

G20E-5, G25E-5, G30E-5

FGA07, FGA08, FGA09 (HMC 2.4L Tier-3)

GC20E-5, GC25E-5, GC30E-5, GC33E-5

FGA0K, FGA0L, FGA0M, FGA0N (HMC 2.4L Tier-3)

G20P-5, G25P-5, G30P-5, G33P-5, G35C-5

FGA0A, FGA0B, FGA0C, FGA0D, FGA0E (MMC 2.4L Tier-3)

G20P-5 Plus, G25P-5 Plus,

G30P-5 Plus, G33P-5 Plus, G35C-5 Plus

FGB0H, FGB0J, FGB0K, FGB0L, FGB0M (GM 3.0L Tier-3)

GC20P-5, GC25P-5, GC30P-5, GC33P-5

FGA0P, FGA0R, FGA0S, FGA0T (MMC 2.4L Tier-3)

1703

Operation &

Maintenance Manual

Original Instruction

Table of Contents

Questions and Answers:

Y
Yolanda CopelandAug 4, 2025
How to troubleshoot engine cranking but not starting in Doosan Lifting Systems (Gas)?
- M
  Micheal SantiagoAug 4, 2025
  If your Doosan Lifting Systems engine cranks but won't start, several issues could be the cause. First, ensure the fuel tank isn't empty and is at least ¼ full. Other potential causes include a clogged fuel filter (repair or replace as needed), a faulty vapor connection (check for holes, loose clamps, or kinks), an electric fuel pump malfunction (check electrical connections, relay, and fuse), a malfunctioning fuel pressure regulator (test its operation), a malfunctioning fuel injector (test its operation), incorrect air/fuel or ignition/spark control (see Advanced Diagnostics), or no VR Sensor signal (verify the VR signal is present).
M
Mary MarshallAug 8, 2025
Why is my Doosan G30P-5 difficult to start (Gas)?
- B
  Brenda GriffinAug 8, 2025
  If your Doosan Lifting Systems experiences difficulty starting, it might be due to several reasons. Check if the fuel tank is almost empty, as this can cause fuel pump cavitations; ensure the tank is at least ¼ full. Other potential causes include a clogged fuel filter (repair or replace), an electric fuel pump malfunction (check connections, relay, and fuse, and verify the pump is operating), a malfunctioning pressure regulator (test its operation), a malfunctioning fuel injector (test its operation), or a clogged air filter (clean or replace as required). Also, incorrect air/fuel or ignition control could be the issue (see Advanced Diagnostics). For engine mechanical issues, consult the Engine Service Manual.
S
Shirley CobbAug 17, 2025
Why does my Doosan Lifting Systems not accelerate or hesitate during acceleration (Gas)?
- A
  Anthony YangAug 17, 2025
  If your Doosan Lifting Systems will not accelerate, hesitates during acceleration, or the engine stalls, first isolate the gasoline system by running the lift truck on LPG. Verify the LPG cylinder is full and the valve is open. If the problem does not exist in LPG mode, proceed with the corrective action steps below; if the problem also exists in LPG mode, the root cause is most likely something other than the fuel system. Other potential causes include a fuel tank that's nearly empty (ensure it's at least ¼ full), a clogged fuel filter (repair or replace), a pressure regulator malfunction (test its operation), or a fuel injector malfunction (test its operation).
J
Jesse PowellAug 21, 2025
How to fix rough idle on Doosan G30P-5 Lifting Systems (Gas)?
- W
  williamstheresaAug 21, 2025
  If your Doosan Lifting Systems has a rough idle, isolate the gasoline system by running the lift truck on LPG. Verify the LPG cylinder is full and the valve is open. If the problem does not exist in LPG mode, proceed with the corrective action steps below; if the problem also exists in LPG mode, the root cause is most likely something other than the fuel system. Other potential causes include a pressure regulator malfunction (test its operation), a clogged fuel filter (repair or replace), or a vacuum leak (check between mixer and throttle body, throttle body and intake manifold, and intake manifold and cylinder head).
B
Brandon RamosAug 26, 2025
What causes poor high speed performance in Doosan G30P-5 Lifting Systems (Gas)?
- C
  christophersimmonsAug 26, 2025
  To address poor high-speed performance in your Doosan Lifting Systems, start by isolating the gasoline system by running the lift truck on LPG. Verify the LPG cylinder is full and the valve is open. If the problem does not exist in LPG mode, proceed with the corrective action steps below; if the problem also exists in LPG mode, the root cause is most likely something other than the fuel system. Also check for a clogged fuel filter (repair or replace), a plugged fuel line (remove obstruction), a clogged air filter (clean or replace), a faulty vapor connection (check for holes, tight clamps, and kinks), a pressure regulator malfunction (test its operation). For incorrect ignition control, see Advanced Diagnostics & Engine Service Manual.
H
harrismeganAug 29, 2025
How to decrease high idle speed on Doosan G30P-5 (Gas)?
- F
  fmcclainAug 29, 2025
  To troubleshoot high idle speed in your Doosan Lifting Systems, check the pedal return spring travel for binding. For incorrect idle speed control, see Advanced Diagnostics & Engine Service Manual.

Doosan G30P-5 Specifications

General

Brand	Doosan
Model	G30P-5
Category	Lifting Systems
Language	English

Summary

Foreword and Manual Overview

Literature Information

Details on manual content, storage, and design changes.

Safety Overview

Introduction to safety precautions, warning signs, and restraint systems.

Operation Overview

Guide to lift truck operation, controls, and techniques.

Safety Section and Precautions

Important Safety Information

Crucial safety rules and precautions to prevent accidents and injuries.

General Hazard Information

Identifies common hazards and precautions for safe operation.

Avoiding Lift Truck Tipover

Explains factors affecting stability and how to prevent tipover incidents.

How to Survive in a Tipover

Instructions for operator safety in the event of a tipover.

General Section and Specifications

Declaration of Conformity

Statement of compliance with relevant EU directives and standards.

Specifications

Detailed technical specifications for various lift truck models.

Capacity Charts

Load capacity charts for various models and tire types.

Operator's Warning and Identification Plate

Explains warning plates, identification plates, and mast abbreviations.

Operation Section

Operator’s Station and Monitoring Systems

Details about the instrument panel, indicators, and gauges.

Lift Truck Controls

Detailed explanation of direction controls, pedals, and levers.

Before Starting the Engine

Walk-around inspection and initial checks before starting the engine.

Starting the Engine

Procedures for starting gasoline, LP, and diesel engines.

Lift Truck Operation

How to operate the lift truck, including transmission and movement.

Basic Troubleshooting (LP)

Common troubleshooting steps for LP fuel system issues.

Advanced Diagnostics

Information on system diagnostics, MIL, DTCs, and blink codes.

Towing Information

Critical safety information and procedures for towing a disabled lift truck.

Maintenance Section

Inspection, Maintenance and Repair of Lift Truck Forks

Guidelines for inspecting, maintaining, and repairing lift truck forks.

Tire Inflation Information

Information on tire inflation pressures and safety precautions.

Torque Specifications

Torque values for metric and standard fasteners and hose clamps.

Maintenance Intervals

Schedule of maintenance tasks based on service hours or time intervals.

Forks – Inspect

Guidelines for inspecting forks for wear, damage, and alignment.

Every 8000 Service Hours or 48 Months

Major maintenance interval for timing belt replacement.

Environment Protection Section

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