FAQ: How to Maintain the Air Filter for 4-Ton and 5-Ton Rough Terrain Forklifts (KDJY50, KDJY40, CPCY40, CPCY50)

Q1: Why is air filter maintenance important for off-road forklifts?

Air filters play a crucial role in protecting diesel engines by preventing dust, dirt, and debris from entering the combustion chamber. In rough terrain environments—such as construction sites, farms, and mining operations—forklifts are exposed to heavy dust and particles. A clogged or damaged air filter can significantly reduce engine efficiency, increase fuel consumption, and cause premature engine wear.

K1634 air filter for 5 ton off-road forklift

Q2: Which air filter fits KDJY50, KDJY40, CPCY40, and CPCY50 forklifts?

The recommended air filter model for these forklifts is the K1634.

Outer diameter: 160 mm
Height: 340 mm
Filter type: Heavy-duty dry-type cylindrical air filter
Application: Diesel-powered 4x4 rough terrain forklifts (4T–5T)

Q3: How often should I replace the K1634 air filter?

Maintenance intervals can vary based on your working environment:

Normal conditions: Check every 100 hours, replace every 300–500 hours.
Dusty or off-road conditions: Check every 50 hours, replace every 150–250 hours.

Always inspect the filter for visible signs of clogging, tearing, or excessive dust accumulation. Never clean the filter with water or high-pressure air if it's not designed for reuse.

Q4: What are signs of a dirty or failing air filter?

Engine losing power under load
Black smoke from exhaust
Unusual fuel consumption
Difficulty starting in the morning
Warning lights on the dashboard (if equipped)

Q5: How do I replace the K1634 air filter?

Shut down the forklift and let the engine cool.
Open the air filter housing.
Remove the old K1634 filter element.
Clean the housing with a dry cloth—avoid using compressed air.
Insert the new K1634 filter, ensuring a proper seal.
Close the housing securely.

Tip: Avoid touching the inner surface of the new filter to prevent contamination.

Q6: Where can I buy the K1634 air filter?

We supply original K1634 air filters directly from the factory. Compatible with:

Kaida（Kaystar） KDJY50 (5-ton rough terrain forklift)
Kaida（Kaystar） KDJY40 (4-ton rough terrain forklift)
Kaystar（Kaida）CPCY40 / CPCY50 series forklifts

Feel free to contact us for 4x4 forklifts spare parts, or technical support.