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Doosan D25S-5 - Service Manual

Doosan D25S-5
264 pages
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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

  • S
    Suzanne CooperAug 4, 2025
    How to troubleshoot engine cranking but not starting in Doosan Lifting Systems (Gas)?
    • L
      Lori GonzalezAug 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).
  • R
    raycolinAug 8, 2025
    Why is my Doosan Lifting Systems difficult to start (Gas)?
    • A
      annaleAug 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.
  • H
    harveymaryAug 16, 2025
    Why does my Doosan D25S-5 Lifting Systems not accelerate or hesitate during acceleration (Gas)?
    • N
      Nancy WebbAug 16, 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).
  • W
    williamsjudithAug 21, 2025
    How to fix rough idle on Doosan D25S-5 Lifting Systems (Gas)?
    • M
      Michael JenningsAug 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).
  • S
    Sara SanchezAug 26, 2025
    What causes poor high speed performance in Doosan D25S-5 (Gas)?
    • W
      William 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.
  • N
    nathanjohnsonAug 29, 2025
    How to decrease high idle speed on Doosan D25S-5 (Gas)?
    • A
      Anna BrownAug 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.
  • N
    Nina JohnsonNov 11, 2025
    What to do if Doosan D25S-5 will not run continuously (Gas)?
    • M
      Matthew JohnsonNov 11, 2025
      If your Doosan Lifting Systems will not run continuously, begin 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. Other potential causes include a nearly empty fuel tank (ensure it's at least ¼ full), a clogged fuel filter (repair or replace), an electric fuel pump malfunction (check connections, relay, and fuse), a pressure regulator malfunction (test its operation), or a fuel injector malfunction (test its operation). For incorrect idle speed or ignition problems, see Advanced Diagnostics. For engine mechanical issues, co...

Doosan D25S-5 Specifications

General IconGeneral
BrandDoosan
ModelD25S-5
CategoryLifting Systems
LanguageEnglish

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