The Komatsu PC200-6 swing gearbox is one of the most sourced excavator swing drive components in the aftermarket — partly because the PC200-6 is one of the best-selling 20-tonne excavators ever built, and partly because its swing gearbox has a finite service life under continuous commercial use. This guide covers everything a repair shop, fleet manager, or OEM parts importer needs to know before placing an order: part numbers, serial range verification, OEM vs aftermarket comparison, compatible machine list, and what to expect on lead time and documentation.
What Is the PC200-6 Swing Gearbox and What Does It Do?
The Komatsu PC200-6 swing gearbox is a multi-stage planetary reducer that drives the full 360° rotation of the excavator’s upper structure. It sits between the hydraulic swing motor and the machine’s ring gear, converting high-speed motor output into the slow, high-torque rotation needed to swing the cab, boom, arm, and bucket assembly through each dig-and-swing cycle.
On the PC200-6, this is a 2-stage planetary gearbox. The first stage handles the highest rotational speed from the hydraulic motor; the second stage multiplies torque to the output that engages the ring gear. Output torque on a standard PC200-6 swing gearbox is approximately 29,000–35,000 Nm depending on configuration.
When this unit fails, the machine’s upper structure cannot rotate. That stops all productive work — trenching, loading, grading — until replacement is complete. Average replacement time with a correct-fit unit is 4–6 hours. Using a unit that requires shimming or adaptor work adds 2–4 hours to that estimate and introduces additional failure risk at the adaptor interface.
Part Numbers: 20Y-26-00150 and 20Y-26-00151 — What’s the Difference?
The two OEM part numbers you’ll encounter for the PC200-6 swing gearbox are 20Y-26-00150 and 20Y-26-00151. Both are genuine Komatsu OEM part numbers for the PC200-6 swing reducer, but they apply to different serial number ranges and machine variants.
| Part Number | Equipment | Series / Stock Code | Application |
|---|---|---|---|
| 20Y-26-00150 | Komatsu PC200-6 | #96514- / 9202983 | Direct OEM-spec replacement |
| 20Y-26-00151 | Komatsu PC200-6 (variant) | #96514- / 9202983 | Cross-reference for specific serial ranges |
⚠️ Critical: Always cross-reference your machine’s serial number prefix before specifying which part number to order. Komatsu PC200-6 machines built across different production years may use different internal configurations even under the same model designation. If you are unsure, send the serial prefix to your supplier for confirmation before payment — this takes minutes and prevents a costly incorrect shipment.
Serial Range Verification: How to Confirm Your Machine Needs This Part
The PC200-6 was produced across multiple years with incremental engineering changes. The serial number prefix on your machine (located on the frame plate, typically near the cab mounting area) tells you which production batch your machine belongs to — and therefore which gearbox specification applies.
The three-step confirmation process before ordering:
- Locate the machine’s serial number plate (frame or cab area)
- Note the full serial number — specifically the first 5–6 digits (the prefix)
- Send the prefix to your supplier with the part number query — confirmation within 4 hours
If the failed gearbox is already removed from the machine, photograph the OEM part number stamped or labelled on the gearbox housing itself. This is the most direct reference and eliminates serial range ambiguity entirely.
Compatible Machine Models Beyond the PC200-6
The 20Y-26-00150 swing gearbox is not exclusive to the PC200-6. The same unit — or a dimensionally equivalent variant — fits a wide range of excavators across multiple brands and weight classes. The table below shows confirmed and commonly referenced compatible models:
| Below 10t | 10–20t | 20–30t | 30–40t | 40t+ |
|---|---|---|---|---|
| PC40-7 | PC120-6 | PC200-6 ✦ | PC300-7 | PC400-6 |
| PC56 | PC160-7 | PC200-7 | PC360-7 | PC400-7 |
| PC60-6 | SK135 | PC200-8 | PC300-8 | PC450-7 |
| PC60-7 | R130 | PC220-7 | SK330-8 | — |
| SK55 / SK60 | SH120 / SH280 | EC210 / EC240 | EC350 / EC360B | — |
✦ Primary fit. For models other than PC200-6, verify serial prefix with your supplier before ordering. Cross-compatibility exists on many of these models but dimensional confirmation is required.
OEM vs Aftermarket: What the Price Difference Reflects
A genuine Komatsu PC200-6 swing gearbox sourced through an authorised dealer typically costs 40–60% more than a quality OEM-spec aftermarket unit. For buyers in Canada, Australia, and Europe, the aftermarket option is often also faster to source — particularly for machines outside the current dealer support window.
- Factory warranty (varies by dealer)
- Guaranteed fit from Komatsu parts database
- Brand accountability
- Price: 40–60% higher than quality aftermarket
- Availability: may be limited for older serial ranges
- Same dimensional tolerances as Komatsu factory unit
- 100% load-tested — signed test report shipped with unit
- 3-month warranty from arrival date
- No MOQ — single-unit orders accepted
- In-stock: ships in 4–7 business days
The critical question when evaluating any aftermarket unit is: “Is every unit individually load-tested before shipment?” A unit that has not been bench-tested carries unknown risk. A unit that has been tested to rated torque and ships with a signed report gives you the same performance assurance — without the OEM price premium.
Key Specifications at a Glance
| Parameter | Details |
|---|---|
| Part Number | 20Y-26-00150 / 20Y-26-00151 |
| Primary Equipment | Komatsu PC200-6 Excavator |
| Category | Construction Machinery Parts — Swing Gearbox |
| Item Condition | New |
| Application | Direct OEM replacement — no shimming or adaptor plates |
| Warranty | 3 months from date of arrival |
| MOQ | No minimum — 1 unit orders accepted |
| In-Stock Lead Time | 4–7 business days processing |
| Shipping | Sea (18–35 days) / Air (5–8 days) / Express DHL/FedEx |
| Documentation | Load test report + video inspection + commercial invoice + packing list |
| Trade Terms | EXW, FOB, CFR, CIF — Jiangmen Port, China |
What to Order at the Same Time
Two components are frequently contaminated or worn when a PC200-6 swing gearbox fails. Replacing them in the same service visit prevents a second breakdown within 12 months and eliminates repeat removal labour costs:
When gearbox fails with internal gear damage, metal debris enters the swing motor case drain within 1–2 operating hours. Flush and inspect; if contamination is confirmed, replace the swing motor at the same time. Both units available from the same supplier — ask for a combined quote.
Output shaft seal, input seal, internal O-ring set, and swing post output bearing. Inexpensive to source and labour-intensive to access once the gearbox is installed — replace all four items every time a new swing gearbox goes in.
Order the PC200-6 Swing Gearbox 20Y-26-00150 — Quote in 24 Hours
Send your machine serial prefix, part number, quantity, and shipping port. We confirm availability and pricing within 24 business hours. In-stock units ship in 4–7 days. Air freight available for machine-down emergencies. Every unit 100% load-tested with signed test report included.
✓ 130+ Compatible Models
✓ No MOQ · Sea / Air / DHL
✓ 3-Month Warranty from Arrival
📧 [email protected] | ISO 9001:2015 · CE · RoHS | Port: Jiangmen, China
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