Doosan GC25E-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

Other manuals for Doosan GC25E-5

Service Manual4 pages

Questions and Answers

S
Sarah HillAug 4, 2025
How to troubleshoot engine cranking but not starting in Doosan Lifting Systems (Gas)?
- E
  Elizabeth MaldonadoAug 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
Rebecca MunozAug 8, 2025
Why is my Doosan Lifting Systems difficult to start (Gas)?
- J
  Jaclyn CharlesAug 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.
V
vkaiserAug 17, 2025
Why does my Doosan Lifting Systems not accelerate or hesitate during acceleration (Gas)?
- R
  Robert BeardAug 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).
C
Calvin PenaAug 21, 2025
How to fix rough idle on Doosan Lifting Systems (Gas)?
- A
  Alyssa BakerAug 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).
K
kbennettAug 25, 2025
What causes poor high speed performance in Doosan Lifting Systems (Gas)?
- M
  Matthew PenaAug 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.
A
Amy HowellAug 29, 2025
How to decrease high idle speed on Doosan Lifting Systems (Gas)?
- D
  Douglas HarringtonAug 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.
J
John LambertNov 11, 2025
What to do if Doosan Lifting Systems will not run continuously (Gas)?
- S
  Sheila WilcoxNov 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 GC25E-5 Specifications

General

Model	GC25E-5
Load Capacity	2500 kg
Lift Height	3000 mm
Overall Length	3600 mm
Overall Width	1200 mm
Weight	4100 kg
Engine Type	Diesel
Transmission Type	Automatic
Power Source	Diesel
Turning Radius	2200 mm
Category	Forklift
Travel Speed (loaded/unloaded)	18 km/h (unloaded)
Lowering Speed (loaded/unloaded)	500 mm/s (unloaded)
Wheelbase	1500 mm
Overall Height	2100 mm
Mast Height (lowered)	2100 mm

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