KOMATSU 425-20-32610 OE Part

Name: KOMATSU 425-20-32610 OE Part
Brand: PTC Drivelines
SKU: KOMATSU 425-20-32610

Komatsu Replacement Part

KOMATSU 425-20-32610

OEM Test Certified Self-Lubricated 24h Quote Response ISO 9001:2015

On a Komatsu WA600-6R or WD600-6, the joint between the engine and transmission takes a different kind of beating than the rest of the driveline — it's dealing with engine torque directly, before anything downstream has a chance to smooth it out. The PTC 1030 Spider Assembly (OEM: KOMATSU 425-20-32610) is a direct drop-in replacement for this joint, matching all OEM dimensions with no modification needed to fit.

This spider sits inside the universal joint that connects the engine output to the transmission input, and it's built to handle the torsional shock that comes straight off the engine before the transmission has any chance to buffer it. It's a precision-machined alloy steel cross with four trunnion arms, each carrying a needle roller bearing cup that lets the joint articulate under load. Because this joint sees engine-side torque directly, wear here tends to present as a distinct knock or shudder right at startup or under sudden throttle, rather than a gradual vibration.

We forge the PTC 1030 from high-grade alloy steel for better fatigue strength than a cast equivalent, and every unit is dimensionally checked against OEM drawings before it ships. An inspection report is available on request.

Technical Specifications

Parameter	Specification
OEM Part Number	KOMATSU 425-20-32610
PTC Part Number	PTC 1030
Product Type	Spider Assembly (Universal Joint Assembly)
Position / Location	Engine to Transmission
Compatible Models	Komatsu WA600-6R, WD600-6 Wheel Loaders
Spider / Cross Material	High-Grade Alloy Steel Forging (Hardened & Ground)
Bearing Type	Needle Roller Bearing (4 cups per assembly)
Sealing System	Sealed Trunnion Bearings
Lubrication	Grease-Packed at Assembly
Dynamic Balancing	Applied to Complete Shaft Assembly
Surface Finish	Trunnion Journals Ground to OEM Tolerance
Heat Treatment	Case-Hardened Trunnion Journals
Application	Komatsu WA600-6R / WD600-6 — Engine-to-Transmission Universal Joint
Operating Environment	Construction, Quarry and General Earthmoving
Weight (Approx.)	Contact PTC for exact weight and dimensional drawing

Frequently Asked Questions

Frequently Asked Questions

Why does this joint wear differently from the spiders further down the driveline?

It sits directly between the engine and transmission, so it absorbs raw engine torque before anything downstream softens it. That means it's more prone to sudden shock wear from hard acceleration or gear changes, whereas spiders further along the driveline see more consistent, gradual loading.

What does a failing engine-to-trans spider usually sound or feel like?

Operators typically describe a sharp knock or clunk right at startup, under sudden throttle, or when shifting between forward and reverse — often more abrupt than the gradual vibration you'd feel from a worn driveshaft spider elsewhere in the system.

Is this the same spider used on the WA600-3 or is that a different part?

No — the WA600-3 uses a different OEM number for this position. This PTC 1030 / 425-20-32610 combination is specific to the WA600-6R and WD600-6. Always check your machine's exact model and serial number before ordering, since the two series aren't interchangeable at this joint.

How urgent is it to replace this if I'm already hearing a knock?

This joint sits close to the engine, so a failure here can cause more serious damage — including to the transmission input — if it's ignored. We'd recommend treating a knock at this position as a priority repair rather than something to monitor over time.

Does the PTC 1030 come with the trunnion bearings already fitted or are those separate?

The trunnion bearings and seals come fully fitted as part of the assembly — it's a complete, ready-to-install spider, not a kit you need to build up yourself.