20Y-01-11112 20Y0111112 Clutch Damper Disc for Komatsu SA6D102E

20Y-01-11112 Disk Damper for Komatsu Excavator

The 20Y-01-11112 / 20Y0111112 disk damper is used for Komatsu excavator flywheel coupling and hydraulic pump drive system applications. It is also searched as a clutch damper disc, clutch plate, disk coupling, pump coupling disc or flywheel damper disc for Komatsu excavator repair.

This page focuses on 20Y-01-11112 as the main part number. Before ordering, the removed disc should be checked by old part number, teeth count, outside diameter, inside diameter, thickness, bolt holes, center hole, mounting face and machine serial number.

Komatsu PC200 PC210 PC220 Application Reference

Common public application references for 20Y-01-11112 include Komatsu PC200-5, PC200-6, PC210-6, PC220-5, PC220-6, PC228US-1 and PC250-6 excavator groups. Some listings also mention SA6D102E-1C and SA6D102E-1C-Z engine references.

Extended references may include PC200LC-5, PC200LC-6, PC210LC-6, PC220LC-5, PC220LC-6, PC228US-2, PC230-6, PC240-6K, PC250LC-6 and PC270LC-6LE. These model names should be treated as checking references only.

Do not select this damper disc by machine model alone. The old disc number, teeth count, dimensions and physical layout are more reliable than the machine model when confirming fitment.

Part Number and 16T Checking Notes

The main part number for this page is 20Y-01-11112. The no-hyphen format 20Y0111112 is also used in supplier catalogs and buyer searches.

Komatsu public product information lists 20Y-01-11112 as a damper under the power train parts group. Some aftermarket listings describe this part as a 16T disk damper for Komatsu SA6D102E-1C and PC200 / PC220 / PC250 series applications.

The 16T detail should be checked against the removed disc before ordering. To keep this product page focused, 20Y-01-11112 should remain the primary search signal.

Clutch Damper Disc Function

The clutch damper disc is installed in the engine rear drive and hydraulic pump coupling area. It helps transmit torque while reducing torsional vibration and shock load between the engine flywheel side and the driven hydraulic pump system.

When the damper disc is worn, cracked or incorrectly matched, the machine may develop abnormal vibration, coupling noise, unstable hydraulic pump drive response or repeated coupling damage. Correct selection is important because teeth count, disc diameter, center hole and bolt hole layout must match the original system.

How to Identify the Correct 20Y-01-11112 Disc

• Check whether the old part number matches 20Y-01-11112 or 20Y0111112.

• Confirm teeth count before ordering, especially when the buyer only provides model information.

• Measure outside diameter, inside diameter and disc thickness.

• Compare bolt hole quantity, bolt circle and mounting face layout.

• Check the center hole, spline or coupling center structure according to the removed disc.

• Confirm machine model and serial number when the old number is missing or unreadable.

Common Failure Symptoms

• Abnormal vibration from the engine rear side or hydraulic pump coupling area.

• Knocking, rattling or impact noise during engine start, stop or load change.

• Visible cracks, damaged damping structure, worn teeth or damaged friction surface.

• Hydraulic pump drive interruption caused by disc or coupling failure.

• Repeated coupling failure caused by misalignment, loose bolts or incorrect replacement part.

• Excessive vibration after replacement caused by wrong teeth count, wrong thickness or incorrect mounting direction.

Troubleshooting Before Replacement

Before replacing the 20Y-01-11112 disk damper, inspect the complete flywheel coupling and hydraulic pump drive area. Damper disc failure may be caused by normal wear, but it can also be related to hydraulic pump misalignment, loose mounting bolts, engine vibration or previous incorrect installation.

• Check coupling hub, flywheel side and hydraulic pump input side for wear or damage.

• Inspect mounting bolts, washers and spacer parts before installing a new disc.

• Check engine mounts and hydraulic pump mounting bracket for looseness or misalignment.

• Inspect flywheel housing and pump drive housing if repeated damper failure occurs.

• Confirm whether the old disc failed from wear, misalignment, overload, loose bolts or wrong replacement part.

Installation and Maintenance Notes

• Compare the old and new disc before installation, including teeth count, OD, ID, thickness, center hole and bolt holes.

• Clean the mounting face and remove debris before assembly.

• Replace damaged bolts, washers or spacer parts when required.

• Tighten bolts evenly according to the service procedure to avoid uneven stress.

• Check alignment between engine flywheel side and hydraulic pump drive side before startup.

• After installation, check abnormal vibration, noise and pump drive response during low-load testing.

Information Needed Before Ordering

To reduce wrong orders, please send the old disc number, Komatsu machine model, machine serial number, front and rear photos of the old disc, teeth count, outside diameter, inside diameter, thickness, bolt hole photo and any visible marks before quotation.

FAQ

Q: What is 20Y-01-11112?

20Y-01-11112 is a Komatsu damper reference commonly used as a disk damper or clutch damper disc in excavator flywheel coupling and hydraulic pump drive applications.

Q: Is 20Y0111112 the same search format?

Yes. 20Y0111112 is the no-hyphen format of 20Y-01-11112 and is commonly used in supplier catalogs and buyer searches.

Q: Which Komatsu models are common references?

Common checking references include Komatsu PC200-5, PC200-6, PC210-6, PC220-5, PC220-6, PC228US-1 and PC250-6. Extended references should be verified by the old disc and machine serial number.

Q: Is this a 16T disk damper?

Some public supplier references describe this product as a 16T disk damper. The teeth count should still be checked against the removed disc before ordering.

Q: Can this part be selected only by machine model?

No. Similar Komatsu excavator models may use different damper discs. The old part number, teeth count, disc dimensions and physical layout should be checked before ordering.