Doosan Forklift G20N-7

Safety Warning: Read and understand the warnings and instructions in the Safety section of the manual before performing any operation or maintenance procedures.

Engine Oil & Filter (G424P(E) Engine Only) - Change

Operate lift truck to warm oil. Park the lift truck with the forks lowered, parking brake applied, transmission in neutral and the engine stopped.

Raise rear of lift truck off ground and block securely.

Warning: Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

Remove the crankcase drain plug and allow oil to drain into a suitable container. Clean and install drain plug.

Raise the hood and seat assembly.

Remove and discard oil filter element.

Wipe sealing surface of oil filter element mounting base. Make sure the entire old gasket is removed.

Warning: This maintenance requires trained personnel with PPE!

Repair forks only in accordance with the manufacturer’s recommendations.

Forks may be sanded or lightly ground, to remove rust, corrosion or minor defects from the surfaces.

Heel sections may be ground with a carbon stone to remove minor surface cracks or defects.

Repair or replace the positioning locks on hook type forks.

Repair or replace most fork retention devices used with other fork types.

A fork should be load tested before being returned to service on completion of repairs authorized and done in accordance with the manufacturer’s recommendations.

Fuel Tank Filter Cap and Screen (If Equipped) - Clean

Seat, Hood Latch & Support Cylinder - Check, Lubricate

First 50 - 100 Service Hours or a Week

You must read and understand the warnings and instructions contained in the Safety section of this manual, before performing any operation or maintenance procedures.

1) Engine Oil & Filter (Diesel Engine Only) - Change

The engine oil in a new engine becomes contaminated from the initial break-in of internal parts. It is very important that the initial oil and filter change is performed as scheduled.

NOTE: The oil drain plug may be in another location if an optional oil pan is used.

Checking Engine Oil (D24A Diesel Engine Only)

1. Check that the engine is at level position.

2. Start and warm up the engine to operating temperature.

3. Stop the engine and wait for 5~10 minutes.

Steps to change engine oil and filter

Air Intake System - Check, Clean

Steps to check and clean air intake system

Cleaning Primary Filter Elements

Steps to clean primary filter elements

Steps to check and adjust belts

Every 1500 Service Hours or 9 Months

1) Inspect Ignition System (LP, Dual Fuel Engine Only)

2. Remove and inspect the spark plugs. Replace as required.

3. Test secondary cables with an Ohmmeter. If the maximum resistance is higher than 25 kOhms, repair and/or replace(G424F(E) engine only).

4. Inspect the ignition coil for cracks and heat deterioration. Visually inspect the coil heat sink fins. If any fins are broken replace as required.

2) Replace Spark Plugs (LP, Dual Fuel Engine Only)

2. Using a gentle twisting motion remove the high voltage cables from the spark plugs. Replace any damaged cables.