Doosan G33P-5 User Manual (English)

Questions and Answers:

A
allenhayleyAug 4, 2025
How to troubleshoot engine cranking but not starting in Doosan G33P-5 Lifting Systems (Gas)?
- C
  Christie WebsterAug 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).
T
Timothy MartinAug 8, 2025
Why is my Doosan G33P-5 Lifting Systems difficult to start (Gas)?
- M
  Marcus CantuAug 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.
B
brendan01Aug 17, 2025
Why does my Doosan G33P-5 Lifting Systems not accelerate or hesitate during acceleration (Gas)?
- T
  Tanya RuizAug 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).
H
Henry StewartAug 21, 2025
How to fix rough idle on Doosan Lifting Systems (Gas)?
- A
  aaronsmithAug 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).
R
Rachel KingAug 25, 2025
What causes poor high speed performance in Doosan Lifting Systems (Gas)?
- M
  Megan WilliamsAug 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.
J
Jay FernandezAug 29, 2025
How to decrease high idle speed on Doosan G33P-5 Lifting Systems (Gas)?
- M
  Mr. Paul SandersAug 30, 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 G33P-5 Specifications

General

Brand	Doosan
Model	G33P-5
Category	Lifting Systems
Language	English

Summary

Safety Section

Foreword and Literature Information

Manual storage, content, and notes on design changes.

Safety Section Overview

Basic safety precautions, warning signs, and operator restraint system.

Important Safety Information and Warnings

Accident prevention, hazard identification, and general warnings.

Warning Signs and Labels

Location and description of safety signs on the lift truck.

General Warnings to Operator

Key safety warnings for operating the lift truck.

Specific Hazard Warnings

Warnings for pressure, hand placement, forks, load backrest, etc.

Parking Brake Safety and Operation

Safe operation and adjustment of the parking brake.

General Hazard Information

Hazards related to operation, materials, and environment.

Operation Information: Pre-Operation Procedures

Mounting, dismounting, and pre-start checks.

Lift Truck Operation Guidelines

Safe operating procedures and techniques.

Loading, Unloading, and Parking Safety

Procedures for loading, unloading, and parking safely.

Burn Prevention and Fire/Explosion Safety

Precautions against burns and fire/explosion hazards.

Tire, Line, and Fire Extinguisher Safety

Hazards and precautions for tires, lines, and fire extinguishers.

Operator Restraint System and Warning Labels

Information on restraint systems and safety labels.

Seat Adjustment and Safety

Adjusting the seat and seat belt system safely.

Seat Belt System

Function, maintenance, and inspection of the seat belt.

Seat Belt Fastening and Release

Instructions for correctly fastening and releasing the seat belt.

Avoiding Lift Truck Tipover and Stability

Understanding lift truck stability and center of gravity.

Lift Truck Stability Base and Capacity Load

Stability base definition and capacity load factors.

General Safety Rules

Essential safety rules for operating forklift trucks.

Operational Safety Rules

Rules for load handling, driving surfaces, and clearances.

Load Handling and Stability Rules

Practices for lifting loads, tipover avoidance, and ramp operations.

Operational Safety Guidelines

Rules for ramps, rough terrain, railroad crossings, and edges.

General Operation and Parking Safety

Safety for truck proximity, towing, parking, and exhaust hazards.

Hazard Awareness and Stability Precautions

Precautions for flammable materials, truck characteristics, and stability.

How to Survive in a Tipover

Operator actions and procedures during a tipover incident.

General Section

Declaration of Conformity

Manufacturer's declaration of compliance with EU directives.

Lift Truck Specifications Overview

Detailed technical specifications for various lift truck models.

Noise and Vibration Specifications

Sound pressure and vibration levels for different models.

Load Capacity Charts

Load capacity charts for various models and configurations.

Attachment Abbreviations

List of abbreviations for special forks and attachments.

Operator Warning Plates and Mast Abbreviations

Location of plates and abbreviations for mast types.

Operation Section

Operator’s Station and Instrument Panel

Overview of operator station, instrument panel, and controls.

Instrument Panel Indicators and Gauges

Detailed descriptions of indicator lights and gauges.

Audio System Controls and Operation

Location and function of audio system controls, modes, and playback.

Electrical Disconnect Switch and Engine Compartment

Operation of disconnect switch and engine compartment access.

Audio System: Getting Started and Settings

Powering on/off, volume control, and sound parameter adjustments.

USB Player Operation

Selecting preset stations and USB playback requirements.

USB Device Handling Precautions

Safe practices for connecting, disconnecting, and using USB devices.

Seat Switch System Operation

Function and operation of the seat switch system.

Key Operator Controls and Switches

Operation of circuit breaker, seat, steering, and fuel selector.

Lift Truck Controls: Pedals and Levers

Operation of control pedals and levers.

Refueling Procedures (Gasoline/Diesel)

Safety and procedures for refueling gasoline or diesel engines.

Changing LP Tanks Safely

Safety and procedures for exchanging LP fuel tanks.

Before Starting: Walk-Around Inspection

Comprehensive pre-start inspection checklist.

Engine Oil and Coolant Level Checks

Procedures for checking engine oil and coolant levels.

Starting Procedures (Gasoline, LP, Diesel)

Steps for starting gasoline, LP, and diesel engines.

Dual Fuel System: Fuel Switching

Procedures for switching between gasoline and LP fuels.

Post-Start Engine and System Checks

Verifying indicator lights and gauges after engine start.

Engine Management Systems Overview

Overview of engine management systems for G424IE and G424I engines.

Basic Troubleshooting (LP Engine)

Troubleshooting common LP engine issues.

Basic Troubleshooting (LP/DF Engine)

Troubleshooting for LP/DF engines.

Troubleshooting: Difficult to Start

Diagnosing issues when the engine is difficult to start.

Troubleshooting: Rough Idle and High Idle

Diagnosing rough idle and high idle speed issues.

Basic Troubleshooting (Gasoline Engine)

Troubleshooting common gasoline engine issues.

Advanced Diagnostics Overview

Introduction to the diagnostic system and MIL operation.

Blink Code Function for DTC Retrieval

Retrieving DTCs using blink codes via DLC connector.

Malfunction Indicator Lamp (MIL) Operation

How the MIL works, persistence, and run cycle requirements.

Mono-Ped Control System Operation

Operation of the optional mono-ped control system.

Auto Shift Controller ASC-100 Operation Modes

Automatic and manual modes of the auto shift controller.

Finger Tip Controls: Knobs and Attachments

Operation of lift, tilt, and sideshift control knobs.

Operating Techniques: Load Handling

Procedures for inching into loads and lifting the load.

Traveling With Load and Unloading Procedures

Safe practices for traveling with loads and unloading.

Parking the Lift Truck Safely

Procedures for safely parking the lift truck.

Lift Fork Adjustment

Steps for adjusting the fork spread and securing them.

Transportation Hints and Machine Lifting

Checking travel routes and procedures for lifting/securing.

Towing Information and Procedures

Procedures and safety warnings for towing a disabled lift truck.

Maintenance Section

Fork Inspection, Maintenance, and Repair

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

Environment Protection Procedures

Proper handling of fluids and cleaning to protect the environment.

Causes of Fork Failure

Common reasons for fork failure like improper repair, fatigue, and overloading.

Fork Inspection Procedures

Daily and first installation inspection steps for forks.

12 Months Fork Inspection

Periodic inspection schedule for forks.

Fork Maintenance and Repair Guidelines

Recommendations for fork repairs and modifications.

Tire Inflation Information and Safety

Procedures and safety for tire inflation.

Torque Specifications for Fasteners

Torque values for various fasteners.

Cooling System Specifications and Coolant Handling

General cooling system info and coolant handling.

Fuel Specifications and Requirements

General fuel guidelines, diesel, bio-diesel, and technical requirements.

Lubricant Specifications

Specifications for engine, hydraulic, drive axle, and transmission oils.

Maintenance Intervals Overview

Summary of maintenance tasks by service interval.

When Required Maintenance Tasks

Maintenance tasks required as needed.

Fuses, Bulbs, Circuit Breaker & Relay Service

Replacing and resetting fuses, bulbs, and circuit breakers.

Fuel System Priming and Filtering (Diesel)

Priming diesel fuel system and changing fuel filter.

Fuel System Leak Testing (LP/Dual Fuel)

Procedures for testing fuel systems for leaks.

Tires and Wheels Inspection (D, G-Series)

Inspecting tires and wheels for wear, damage, and inflation.

Carriage Roller Extrusion Adjustment

Adjusting carriage roller extrusion for proper height.

Daily Maintenance Checks

Air cleaner, foot pedal, exhaust, walk-around inspections.

Transmission Oil and Parking Brake Service

Checking transmission oil and inspecting/adjusting parking brake.

Every 250, 500, 1000, 1500, 2000, 2500, 8000 Hour Services

Summary of maintenance tasks by service interval.

Engine Oil & Filter Change (Diesel Engine Only)

Procedure for changing engine oil and filter for diesel engines.

Fuel Filter Change (Diesel Engine Only)

Steps for replacing the fuel filter for diesel engines.

Fuel Filter Replacement Details (Diesel)

Completing the diesel fuel filter replacement.

PCV Valve System Inspection and Cleaning

Inspecting and cleaning the PCV valve system.

Engine Valve Lash Check and Adjustment (Diesel)

Procedures for checking and adjusting engine valve lash.

Every 1500 Service Hours or 9 Months

Maintenance tasks scheduled for 1500 hours or 9 months.

Inspect Ignition System (LP, Gasoline, Dual Fuel)

Inspecting ignition system components.

Replace Spark Plugs (G430FE/G424P(E) Engine Only)

Replacing spark plugs for specific engine models.

Spark Plug Replacement (G430FE/G424P(E))

Steps for replacing spark plugs, including gapping and torque.

Replace LP Fuel Filter Element (LP/Dual Fuel Engine Only)

Replacing the LP fuel filter element.

LP Fuel Filter Element Replacement Details

Completing the LP fuel filter replacement.

Testing Fuel Lock-off Operation (LP Engine Only)

Testing the fuel lock-off operation for LP engines.

Engine Oil & Filter Change (Diesel Engine Only)

Procedure for changing engine oil and filter for diesel engines.

Fuel Filter Change (Diesel Engine Only)

Steps for replacing the fuel filter for diesel engines.

Fuel Filter Replacement Details (Diesel)

Completing the diesel fuel filter replacement.

PCV Valve System Inspection and Cleaning

Inspecting and cleaning the PCV valve system.

Checking TMAP Sensor (G424I(E)/G430FE/G424P(E) Engine Only)

Verifying TMAP sensor mounting and O-ring seal.

Inspecting for Intake Leaks (G424I(E)/G430FE/G424P(E) Engine Only)

Inspecting intake manifold and throttle assembly for leaks.

Replace PCV Valve and Breather Element (LP/Gasoline/Dual Fuel)

Replacing the PCV valve and breather element.

Governor Lever and Engine Speed Control (Diesel Engine Only)

Checking and adjusting governor lever and speed control.

Every 2000 Service Hours or Yearly

Yearly or 2000-hour maintenance tasks.

Engine Valve Lash Check and Adjustment (Diesel)

Procedures for checking and adjusting engine valve lash.

Steering System Service and Wheel Bearing Reassembly

Lubricating steering components and reassembling wheel bearings.

Forks Inspection Procedures

Detailed inspection steps for fork blades, shanks, and mountings.

Every 2500 Service Hours or 15 Months

Maintenance tasks scheduled for 2500 hours or 15 months.

Hydraulic Oil Service

Procedures for checking, cleaning, and changing hydraulic oil.

Inspect Battery System

Cleaning and inspecting the battery system.

Replace Oxygen Sensor (G424I(E)/G430FE/G424P(E) Engine Only)

Replacing oxygen sensors on exhaust manifold and muffler.

Replace Spark Plugs (G424I(E) Engine Only)

Steps for replacing spark plugs and their specifications.

Engine Component Checks and Replacements

Checking TMAP sensor, intake leaks, and replacing PCV valve.

Every 8000 Service Hours or 48 Months

48-month or 8000-hour service tasks, including timing belt replacement.

Environment Protection Section

Environment Protection Procedures

Guidelines for environmentally sound servicing and cleaning.

Related product manuals

Doosan G33P-5 User Manual

Table of Contents

Questions and Answers:

Doosan G33P-5 Specifications

Summary

Safety Section

Foreword and Literature Information

Safety Section Overview

Important Safety Information and Warnings

Warning Signs and Labels

General Warnings to Operator

Specific Hazard Warnings

Parking Brake Safety and Operation

General Hazard Information

Operation Information: Pre-Operation Procedures

Lift Truck Operation Guidelines

Loading, Unloading, and Parking Safety

Burn Prevention and Fire/Explosion Safety

Tire, Line, and Fire Extinguisher Safety

Operator Restraint System and Warning Labels

Seat Adjustment and Safety

Seat Belt System

Seat Belt Fastening and Release

Avoiding Lift Truck Tipover and Stability

Lift Truck Stability Base and Capacity Load

General Safety Rules

Operational Safety Rules

Load Handling and Stability Rules

Operational Safety Guidelines

General Operation and Parking Safety

Hazard Awareness and Stability Precautions

How to Survive in a Tipover

General Section

Declaration of Conformity

Lift Truck Specifications Overview

Noise and Vibration Specifications

Load Capacity Charts

Attachment Abbreviations

Operator Warning Plates and Mast Abbreviations

Operation Section

Operator’s Station and Instrument Panel

Instrument Panel Indicators and Gauges

Audio System Controls and Operation

Electrical Disconnect Switch and Engine Compartment

Audio System: Getting Started and Settings

USB Player Operation

USB Device Handling Precautions

Seat Switch System Operation

Key Operator Controls and Switches

Lift Truck Controls: Pedals and Levers

Refueling Procedures (Gasoline/Diesel)

Changing LP Tanks Safely

Before Starting: Walk-Around Inspection

Engine Oil and Coolant Level Checks

Starting Procedures (Gasoline, LP, Diesel)

Dual Fuel System: Fuel Switching

Post-Start Engine and System Checks

Engine Management Systems Overview

Basic Troubleshooting (LP Engine)

Basic Troubleshooting (LP/DF Engine)

Troubleshooting: Difficult to Start

Troubleshooting: Rough Idle and High Idle

Basic Troubleshooting (Gasoline Engine)

Advanced Diagnostics Overview

Blink Code Function for DTC Retrieval

Malfunction Indicator Lamp (MIL) Operation

Mono-Ped Control System Operation

Auto Shift Controller ASC-100 Operation Modes

Finger Tip Controls: Knobs and Attachments

Operating Techniques: Load Handling

Traveling With Load and Unloading Procedures

Parking the Lift Truck Safely

Lift Fork Adjustment

Transportation Hints and Machine Lifting

Towing Information and Procedures

Maintenance Section

Fork Inspection, Maintenance, and Repair

Environment Protection Procedures

Causes of Fork Failure

Fork Inspection Procedures