KOMATSU 428-20-12620 / 569-20-79210 OE Part

Technical Specifications

PTC-1011 — SPIDER ASSY - FRONT (KOMATSU 421-20-32621 / 569-20-79110)

Specification	Detail
OEM Part Number	KOMATSU 421-20-32621 / 569-20-79110
PTC Part Number	PTC-1011
Product Type	Spider Assembly (Universal Joint Assembly)
Position / Location	Front Axle
Machine Compatibility	Dump Trucks / Haul Trucks
Application No.	HD465-7
Application	Komatsu HD465-7 Dump Truck — Front Propeller Shaft Universal Joint
Joint Series Classification	5C Series
Spider / Cross Material	High-Grade Alloy Steel Forging (Hardened & Ground)
Bearing Type	Sealed Needle Roller Bearing (4 cups per assembly)
Sealing System	Three-Stage Self-Lubricated Sealed
Lubrication	Self-Lubricated — Factory Charged, Lifetime Sealed (no re-greasing required)
Maximum Articulation Angle	Up to 12° (operating) · 32° (static)
Dynamic Balancing	Applied to complete shaft assembly — G16 ISO 1940
Surface Finish	Trunnion journals: Ground to OEM tolerance class
Heat Treatment	Case hardened trunnion journals to required case depth and hardness
Operating Environment	Heavy Mining — Coal, Iron Ore, Copper, Gold — Open-pit & Underground
Temperature Range	−40°C to +120°C (bearing and grease rated)
Grease Type	High-Temperature Lithium Complex Grease (Factory Charged)
Fitment	Direct OEM Replacement — No Equipment Modification Required
Weight (Approx.)	Contact PTC for exact weight with dimensional drawing

Frequently Asked Questions

Why does the rear spider on my HD465-7R seem to wear more gradually than a front joint issue would?

The rear joint typically carries a steady, consistent load rather than the sharper shock loading the front joint absorbs from terrain impact, so wear tends to build slowly here. A gradual increase in play or vibration is normal wear behavior for this position rather than a sign of sudden failure.

Are 428-20-12620 and 569-20-79210 two different parts or the same spider on my HD465-7R?

They're the same physical component—Komatsu has issued two reference numbers for this rear spider position over time. The PTC 1011 covers both, so you don't need to determine which one your truck originally carried.

How do I tell the difference between rear spider wear and rear driveshaft wear on my HD465-7R?

Spider wear at the joint usually shows up as a knock or play you can feel specifically at the universal joint when rocking the shaft by hand, while driveshaft wear tends to present as vibration that scales with road speed. If you're unsure, it is worth inspecting the joint directly rather than assuming.

Is the PTC 1011 the same part used at the front position on my HD465-7R, or is that a different spider?

No — the front position uses a different OEM/PTC reference (421-20-32621 / 569-20-79110, PTC 1010). Front and rear spiders on the HD465-7R are separate parts and aren't interchangeable.

Can I request a dimensional drawing for OEM 428-20-12620 before ordering the PTC 1011 for my HD465-7R?

Yes. Every PTC 1011 batch is checked against OEM drawings before shipping, and we can provide a certified dimensional drawing or full inspection report on request — just reference OEM number 428-20-12620 or PTC 1011 when you contact us.