4346770 A/C Pulley for Hitachi EX120-5 ZX200

4346770 Idler Pulley for Hitachi and John Deere Excavator

The 4346770 idler pulley is supplied for excavator air conditioning belt drive and accessory drive repair. It is commonly searched as 4346770, Hitachi idler pulley, John Deere idler pulley, A/C pulley, air conditioner compressor pulley, excavator pulley or belt drive pulley for heavy equipment repair.

This page focuses on 4346770 as the main part number. Ref cross numbers include 8-94399957-0, 8943999570 and AT213915. Final fitment should be confirmed by the old pulley number, pulley outside diameter, belt width, bearing size, mounting position and machine information before ordering.

Machine and System Reference

Common machine references for this pulley include Hitachi EX100-5, EX120-5, EX200-5, ZX200 and related Hitachi excavator models. It is also commonly listed for John Deere excavator applications using the same pulley reference.

This part should be understood as an idler pulley or air conditioning pulley, not a complete belt tensioner assembly. It works in the belt drive system to guide or support belt operation around the air conditioning compressor or related accessory drive position.

Machine model alone is not enough for final confirmation. Similar pulleys may differ by outside diameter, belt contact width, bearing type, center hole, offset and mounting position. The removed pulley and old part number are more reliable than the machine model alone.

Part Number and Ref Cross Notes

4346770 is the main identifying number of this product page. It should stay visible in the SEO Title, H1, top parameters, first paragraph, product body and image ALT text.

Ref cross numbers include 8-94399957-0, 8943999570 and AT213915. These numbers are listed together in common Hitachi and John Deere idler pulley references, but final replacement should still be checked by the old pulley and physical structure.

Do not mix this page with unrelated belt tensioner assemblies unless the supplied part is confirmed to be the same pulley. A pulley-only part and a complete belt tensioner assembly are different repair items.

How to Confirm the Correct Idler Pulley

Before ordering 4346770, compare the removed pulley carefully. Small differences in pulley diameter, belt width, bearing size, center hole and offset may affect belt alignment and installation.

• Confirm whether the old part number is 4346770, 8-94399957-0 or AT213915.

• Check whether the pulley is used in the air conditioning belt drive or accessory drive position.

• Compare the pulley outside diameter, pulley width and belt contact surface.

• Check the bearing size, center hole and mounting position.

• Confirm whether the pulley matches the belt path and accessory drive layout.

• Send photos of the old pulley number, front side, rear side, bearing area and machine nameplate before quotation if you are not sure.

Common Idler Pulley Failure Symptoms

An idler pulley may need replacement when the belt drive has abnormal noise, pulley wobble, bearing roughness, belt slipping, belt edge wear, unstable belt tracking or repeated belt damage.

Before replacing the pulley, check the belt condition, compressor pulley, tensioner, bracket, bearing condition and belt alignment. Some belt problems may be caused by misalignment, worn bearings or damaged related drive parts rather than the idler pulley alone.

If the old pulley failed because of belt misalignment, bearing seizure or incorrect belt installation, the root cause should be corrected before installing the replacement pulley. Otherwise, the new pulley may fail early.

Installation and Testing Notes

Before installation, turn off the machine and inspect the belt drive system. Make sure the pulley mounting surface is clean and the belt path is correctly routed.

After installation, rotate the pulley and check whether it runs smoothly. Confirm belt alignment, pulley rotation and belt tracking before returning the machine to work.

After the first running test, inspect the pulley and belt again. If the belt moves out of line or the pulley makes abnormal noise, stop the machine and recheck pulley fitment, belt alignment and related accessory drive components.

Buying Notes for Repair Shops and Parts Distributors

For repair shops, this 4346770 idler pulley is suitable for excavator air conditioning belt drive repair when the old pulley is noisy, worn, seized, misaligned or unable to support stable belt operation.

For parts distributors, it can be supplied as a Hitachi and John Deere excavator pulley reference for heavy equipment repair demand. Topvelsun supports small repair orders and bulk inquiries. Please send the required quantity, old pulley number, machine model and photos of the old pulley from multiple angles.

FAQ

What is the main product on this page?

This page is for the 4346770 idler pulley used for excavator air conditioning belt drive or accessory drive repair.

Is 4346770 a complete belt tensioner assembly?

No. 4346770 is better described as an idler pulley, A/C pulley or air conditioner compressor pulley. Please do not treat it as a complete belt tensioner assembly unless your old part confirms the same structure.

What are the ref cross numbers for 4346770?

Ref cross numbers include 8-94399957-0, 8943999570 and AT213915. Please confirm the old pulley number and physical dimensions before ordering.

Which machines are common references?

Common references include Hitachi EX100-5, EX120-5, EX200-5, ZX200 and John Deere excavator applications. Final confirmation should still be based on the old pulley number and dimensions.

Can I confirm this pulley by machine model only?

No. Machine model is only a reference. Please check the old part number, pulley diameter, belt width, bearing size, center hole and mounting position before ordering.

What photos should I send before ordering?

Please send photos of the old pulley number, front side, rear side, bearing area, belt contact surface and machine nameplate. These photos help confirm whether 4346770 is the correct pulley.