6731-61-4510 3194086 Belt Tensioner for PC200-6 PC220-6

6731-61-4510 / 3194086 Belt Tensioner for Komatsu 6D102 Engine

The 6731-61-4510 / 3194086 belt tensioner is supplied for Komatsu excavator engine accessory drive system repair. It is commonly searched as 6731-61-4510 belt tensioner, 3194086 belt tensioner, Komatsu 6D102 belt tensioner, PC200-6 belt tensioner, PC200-7 belt tensioner, PC220-6 belt tensioner or engine tensioner pulley for Komatsu excavator repair.

This page focuses on 6731-61-4510 and 3194086 as the main part number signals. Final fitment should be confirmed by the old part number, engine model, pulley diameter, belt groove type, mounting holes, bracket shape, arm angle and machine information before ordering.

Engine and Machine Reference

Common engine reference for this belt tensioner is the Komatsu 6D102 engine. Common machine references include Komatsu PC200-6, PC200-7, PC220-6 and PC220-7 excavators.

The belt tensioner works in the engine accessory drive system to help maintain stable belt tension and correct belt alignment. Depending on the engine arrangement, it may work around the fan drive, alternator drive, water pump drive or other belt-driven engine accessories.

Machine model alone is not enough for final confirmation. Komatsu excavators may use different belt drive arrangements depending on engine version, production configuration and accessory layout. The removed tensioner and old part number are more reliable than the machine model alone.

Part Number and Reference Notes

6731-61-4510 and 3194086 are the main identifying numbers of this product page. They should stay visible in the SEO Title, H1, top parameters, first paragraph, product body and image ALT text.

Some market references may also mention 6736-61-4120 together with 6731-61-4510 and 3194086. This number can be used as a checking reference only when the old tensioner, package label or supplier data confirms the same structure.

Do not mix unrelated Komatsu or Cummins belt tensioner numbers into this page unless the physical structure is confirmed. Similar belt tensioners may differ by pulley diameter, belt groove, bracket shape, arm angle, spring tension, mounting hole position and belt alignment.

How to Confirm the Correct Belt Tensioner

Belt tensioners can look similar in product photos, but small differences in pulley size, groove type, arm angle, spring tension, mounting holes and bracket shape may affect installation and belt alignment. Please compare the removed part before ordering.

• Confirm whether the old part number is 6731-61-4510 or 3194086.

• Check whether the engine reference is Komatsu 6D102.

• Check whether the machine reference is PC200-6, PC200-7, PC220-6 or PC220-7.

• Compare the pulley diameter, pulley width and belt groove type.

• Check the mounting hole position, bracket shape and arm angle.

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

Common Belt Tensioner Failure Symptoms

A belt tensioner may need replacement when the engine has belt noise, belt slipping, unstable belt tension, worn pulley bearing, pulley wobble, belt edge wear, abnormal vibration, weak spring tension or repeated belt damage.

Before replacing the tensioner, check the belt condition, pulley alignment, idler pulley, fan drive, alternator pulley, water pump pulley and mounting bracket. Some belt problems may be caused by misalignment, worn pulleys or damaged accessories rather than the tensioner alone.

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

Installation and Testing Notes

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

After installation, check belt tension, pulley alignment and pulley rotation. The belt should run smoothly without jumping, abnormal noise or side wear.

After the first running test, inspect the belt and tensioner again. If the belt moves out of line or the tensioner vibrates abnormally, stop the engine and recheck pulley alignment, bracket position and accessory drive condition.

Buying Notes for Repair Shops and Parts Distributors

For repair shops, this 6731-61-4510 / 3194086 belt tensioner is suitable for Komatsu 6D102 engine accessory drive repair when the old tensioner is worn, noisy, weak, misaligned or unable to maintain stable belt tension.

For parts distributors, it can be supplied as a Komatsu PC200 and PC220 belt tensioner reference for heavy equipment repair demand. Topvelsun supports small repair orders and bulk inquiries. Please send the required quantity, old tensioner number, engine model, machine model and photos of the old tensioner from multiple angles.

FAQ

What is the main product on this page?

This page is for the 6731-61-4510 / 3194086 belt tensioner used for Komatsu excavator engine accessory drive system repair.

Are 6731-61-4510 and 3194086 the same product?

They are commonly listed together for the same Komatsu 6D102 belt tensioner direction. Final confirmation should still be based on the old part number, pulley structure and installation position.

Which engine is the main application reference?

The main engine reference is Komatsu 6D102. Please still confirm the old part number, pulley size, belt groove type and mounting structure before ordering.

Which Komatsu excavator models are common references?

Common machine references include Komatsu PC200-6, PC200-7, PC220-6 and PC220-7. Final confirmation should be based on the old tensioner number and physical structure.

Can I use 6736-61-4120 as a replacement number?

6736-61-4120 may appear as a market checking reference together with 6731-61-4510 and 3194086, but it should not be treated as an automatic replacement unless the old part number or physical structure confirms interchange.

What photos should I send before ordering?

Please send photos of the old tensioner number, front side, rear side, pulley side, mounting bracket, belt groove, engine nameplate and machine nameplate. These photos help confirm whether 6731-61-4510 / 3194086 is the correct belt tensioner.