Doosan D20S-5 User 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:

J
Jennifer MarshallJul 30, 2025
How to troubleshoot engine cranking but not starting in Doosan D20S-5 (Gas)?
- O
  Omar MoonJul 30, 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).
A
anne72Aug 3, 2025
Why is my Doosan D20S-5 difficult to start (Gas)?
- W
  wattsmichaelAug 3, 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.
A
andrewhornAug 11, 2025
Why does my Doosan Lifting Systems not accelerate or hesitate during acceleration (Gas)?
- M
  michael57Aug 11, 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
julie39Aug 16, 2025
How to fix rough idle on Doosan D20S-5 Lifting Systems (Gas)?
- M
  mdominguezAug 16, 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).
K
Karen RobinsonAug 20, 2025
What causes poor high speed performance in Doosan D20S-5 (Gas)?
- L
  Lee Smith MDAug 20, 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.
C
cervantesdavidAug 25, 2025
How to decrease high idle speed on Doosan D20S-5 Lifting Systems (Gas)?
- J
  Jacob LyonsAug 26, 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 D20S-5 Specifications

General

Brand	Doosan
Model	D20S-5
Category	Lifting Systems
Language	English

Summary

Safety Section

Important Safety Information

General precautions to avoid accidents and injury during operation and maintenance.

Parking brake

Operating the Lift Truck

Rules for safe control, traffic, and movement of the lift truck.

How to Survive in a Tipover

Instructions for operator survival in case of a lift truck tipover.

Operation Section

Lift Truck Controls

Refueling

Safety precautions and procedures for refueling gasoline or diesel engines.

Starting the Engine

Procedures for starting gasoline and diesel engines safely.

Lift Truck Operation

Detailed steps for operating the lift truck with power shift transmission.

Basic Troubleshooting(LP)

Advanced Diagnostics

Maintenance Section

Inspection, Maintenance and Repair of Lift Truck Forks

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