2969 Views Updated 27 September 2026

331.01.0012 Mercedes-Benz AXOR Compatible Fan Tensioner

331.01.0012

Summary

This fan belt tensioner is designed for Mercedes-Benz AXOR vehicles, specifically compatible with OM 457 LA engines. It ensures consistent tension in the cooling system fan drive to prevent belt slip and ensure optimal engine cooling performance in heavy commercial vehicle applications. Equivalent to OE Dayco APV2446 and Mercedes-Benz 4572002970.

Product identifiers
EAN Code	8699031092508

Ready to Order

Get Information

Compatible OEM Codes

MERCEDES BENZ
- 457 200 45 70
- 457 200 43 70
- 457 200 31 70
- 457 200 29 70
DAYCO
- APV2446

Description

This fan belt tensioner plays a critical role in the cooling system of heavy commercial vehicles by maintaining the correct tension on the belt driving the fan. By applying constant, balanced pressure, it prevents belt slippage and ensures the fan operates at its designed speed, which is vital for maintaining stable engine temperatures during heavy-duty operation.

This component is specifically compatible with Mercedes-Benz AXOR models and AXOR 2 variants, including those equipped with the OM 457 LA engine. It is designed to meet the rigorous requirements of heavy commercial vehicle cooling systems, ensuring reliable performance across various configurations like the 3335 B, 4143 K, and 2543 LS models.

For workshop technicians, it is recommended to verify the engine code and mounting type during installation. When replacing this unit, it is essential to check the condition of the belt and pulley to ensure the entire fan drive line remains in optimal condition. Maintaining proper tension prevents premature wear on other cooling system components.

Regular inspection of the tensioner can help prevent overheating issues caused by belt slack or bearing failure. Consult your authorized distributor for further assistance.

What is a Fan Belt Tensioner? A fan belt tensioner is a spring-loaded unit in the cooling system of heavy commercial vehicles that keeps the belt driving the fan at the correct tension.

OE cross-reference

331.01.0012 (Fan Belt Tensioner Fan) is the equivalent of the Dayco and Mercedes-Benz OE numbers. This part directly replaces Dayco OE number APV2446. It also replaces Mercedes-Benz OE numbers 4572002970, 4572003170, 4572004370, 4572004570.

Other OEMs

DAYCO

APV2446

MERCEDES BENZ

A4572004570
A4572004370
A4572003170
A4572002970
4572004570
4572004370
4572003170
4572002970
457.200.4570
457.200.45.70
457.200.4370
457.200.43.70
457.200.3170
457.200.31.70
457.200.2970
457.200.29.70
457 200 4570
457 200 4370
457 200 3170
457 200 2970
457 200 45 70
457 200 43 70
457 200 31 70
457 200 29 70

Compatible Vehicles

Compatible Vehicles
Brand	Model	Model Type	Engine
DAYCO
MERCEDES BENZ	AXOR	1835 LS	OM 457 LA
MERCEDES BENZ	AXOR	1840 LS	OM 457 LA
MERCEDES BENZ	AXOR	1843 LS	OM 457 LA
MERCEDES BENZ	AXOR	2535 LS	OM 457 LA
MERCEDES BENZ	AXOR	2540 LS	OM 457 LA
MERCEDES BENZ	AXOR	2543 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	1835 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	1836 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	1840 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	1843 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2435 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2436 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2440 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2443 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2535 L	OM 457 LA
MERCEDES BENZ	AXOR 2	2535 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2536 L	OM 457 LA
MERCEDES BENZ	AXOR 2	2536 LL	OM 457 LA
MERCEDES BENZ	AXOR 2	2536 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2540 L	OM 457 LA
MERCEDES BENZ	AXOR 2	2540 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2543 L	OM 457 LA
MERCEDES BENZ	AXOR 2	2543 LS	OM 457 LA
MERCEDES BENZ	AXOR 2	2543 S	OM 457 LA
MERCEDES BENZ	AXOR 2	2635 B	OM 457 LA
MERCEDES BENZ	AXOR 2	2635 K	OM 457 LA
MERCEDES BENZ	AXOR 2	2636 B	OM 457 LA
MERCEDES BENZ	AXOR 2	2636 K	OM 457 LA
MERCEDES BENZ	AXOR 2	2640 B	OM 457 LA
MERCEDES BENZ	AXOR 2	2640 K	OM 457 LA
MERCEDES BENZ	AXOR 2	2643 B	OM 457 LA
MERCEDES BENZ	AXOR 2	2643 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3235 B	OM 457 LA
MERCEDES BENZ	AXOR 2	3235 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3236 B	OM 457 LA
MERCEDES BENZ	AXOR 2	3236 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3240	OM 457 LA
MERCEDES BENZ	AXOR 2	3240 B	OM 457 LA
MERCEDES BENZ	AXOR 2	3240 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3243	OM 457 LA
MERCEDES BENZ	AXOR 2	3243 B	OM 457 LA
MERCEDES BENZ	AXOR 2	3243 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3335	OM 457 LA
MERCEDES BENZ	AXOR 2	3335 B	OM 457 LA
MERCEDES BENZ	AXOR 2	3335 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3336 B	OM 457 LA
MERCEDES BENZ	AXOR 2	3336 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3340	OM 457 LA
MERCEDES BENZ	AXOR 2	3340 B	OM 457 LA
MERCEDES BENZ	AXOR 2	3340 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3341	OM 457 LA
MERCEDES BENZ	AXOR 2	3341 K	OM 457 LA
MERCEDES BENZ	AXOR 2	3343	OM 457 LA
MERCEDES BENZ	AXOR 2	3343 B	OM 457 LA
MERCEDES BENZ	AXOR 2	3343 K	OM 457 LA
MERCEDES BENZ	AXOR 2	4135 B	OM 457 LA
MERCEDES BENZ	AXOR 2	4135 K	OM 457 LA
MERCEDES BENZ	AXOR 2	4136 B	OM 457 LA
MERCEDES BENZ	AXOR 2	4136 K	OM 457 LA
MERCEDES BENZ	AXOR 2	4140 B	OM 457 LA
MERCEDES BENZ	AXOR 2	4140 K	OM 457 LA
MERCEDES BENZ	AXOR 2	4143 B	OM 457 LA
MERCEDES BENZ	AXOR 2	4143 K	OM 457 LA
MERCEDES BENZ	AXOR 2	LL	OM 457 LA
MERCEDES BENZ	AXOR 2	LLS	OM 457 LA

FAQ

What is the function of this fan belt tensioner?

It maintains constant tension on the fan belt to prevent slipping and ensures the cooling fan rotates at the correct speed to manage engine temperature.

Which engines is this part compatible with?

This part is specifically designed for use with Mercedes-Benz OM 457 LA engines found in various AXOR series models.

How can I know if my tensioner needs replacement?

Signs of wear include unusual noise from the pulley, visible belt fraying, or inconsistent engine temperature readings due to belt slack.

Can I use this for any Mercedes-Benz truck?

This specific unit is tailored for the Mercedes-Benz AXOR and AXOR 2 series; always verify your specific model and engine code before installation.

What are the OE reference numbers of this part?

331.01.0012 directly replaces Dayco OE number APV2446. It also replaces Mercedes-Benz OE numbers 4572002970, 4572003170, 4572004370, 4572004570.