Doosan G35C-5 User Manual

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SB2349E04

Operation &

Maintenance Manual

FORKLIFTS

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

G20E-5, G25E-5, G30E-5

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

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

G20P-5 Plus, G25P-5 Plus,

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

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

1105

Original Instruction

Table of Contents

Questions and Answers:

B
bernardsotoAug 4, 2025
How to troubleshoot engine cranking but not starting in Doosan G35C-5 (Gas)?
- S
  Sara SampsonAug 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).
C
Chad JonesAug 8, 2025
Why is my Doosan G35C-5 difficult to start (Gas)?
- F
  fbrownAug 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.
P
Peter AllisonAug 17, 2025
Why does my Doosan G35C-5 not accelerate or hesitate during acceleration (Gas)?
- M
  Matthew EvansAug 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).
S
Stephen MooreAug 21, 2025
How to fix rough idle on Doosan G35C-5 (Gas)?
- V
  veronica14Aug 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
Ryan GomezAug 25, 2025
What causes poor high speed performance in Doosan G35C-5 (Gas)?
- V
  Vincent TravisAug 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
hooverjoeAug 29, 2025
How to decrease high idle speed on Doosan G35C-5 Lifting Systems (Gas)?
- J
  Joann BradleyAug 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 G35C-5 Specifications

General

Brand	Doosan
Model	G35C-5
Category	Lifting Systems
Language	English

Summary

Information Section

Foreword

Introduction to the manual's purpose, storage, and content.

Safety Section

Covers essential safety precautions, warnings, and hazard information.

General Section

Provides technical specifications, conformity declarations, and capacity charts.

Operation Section

Details on operating the lift truck, controls, and systems.

Maintenance Section

Guidelines for inspection, maintenance, and repair of lift truck components.

Safety Section

Important Safety Information

Critical safety precautions for operation and maintenance.

Safety Rules

Essential guidelines for safe forklift operation.

How to Survive in a Tipover

Procedures to minimize injury during tipover incidents.

General Section

Declaration of Conformity

Legal compliance statement for equipment.

Specifications

Technical details and performance data of the lift trucks.

Capacity Chart (Without Sideshifter Pneumatic)

Load capacity data based on lifting height and load center.

Operation Section

Operator’s Station and Monitoring Systems

Description of controls, indicators, and gauges.

Lift Truck Controls

Detailed explanation of all lift truck operating controls.

Refueling

Safe procedures for refueling the lift truck.

Before Starting the Engine

Pre-operation checks and walk-around inspection procedures.

Starting the Engine

Procedures for safely starting the engine.

Advanced Diagnostics

Troubleshooting system for identifying and resolving faults.

Maintenance Section

Inspection, Maintenance and Repair of Lift Truck Forks

Guidelines for fork inspection, care, and repair.

Maintenance Intervals

Schedule for routine checks and servicing.

Engine Oil & Filter (Diesel Engine Only) - Change

Procedure for changing engine oil and filter.

Hydraulic Return Filter – Change

Steps for replacing the hydraulic return filter.

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