NACHI Japan Genuine PHV-1B-12B-PT Final Drive Travel Motor – Precision Power for Your 1‑Ton Mini Excavator

Description

Detail Information

Note: The application information provided is for reference only. Please confirm the part number and compare it with the old component before purchasing. If you have any questions, please feel free to contact us.
It is worth choosing a product that features stable performance, high reliability, easy installation, and quick response.

This tiny powerhouse is an all‑in‑one final drive travel motor that pairs a high‑efficiency swash‑plate axial piston hydraulic motor with a planetary gearbox. Built by Japan’s NACHI‑FUJIKOSHI CORP, it is the original drive unit that powers CAT 301, Kobelco 27SR, Yanmar 20/25 and many other 1‑ton class mini excavators.

You are not buying a “replacement part” – you are buying the ability to keep your machine moving with factory‑spec speed, torque, and steering precision.

1. Key Features & Benefits

All‑in‑one mini excavator travel motor – This PHV‑1B‑12B‑PT unit integrates the hydraulic motor, multi‑stage planetary gearbox, and wet disc parking brake into a single housing. It fits directly in place of the original final drive on CAT 301, Yanmar Vio series, Kobelco SK27SR, and compatible 1‑ton mini excavators.
Factory two‑speed shift – Built‑in two‑speed capability lets the operator switch between high‑speed travel for moving around the site and low‑speed, high‑torque crawling for trenching, pushing or climbing. No modification – your machine’s standard two‑speed control works out of the box.
Precision NACHI Japanese engineering – Original Nachi PHV‑1B series technology, known for high volumetric efficiency, low internal leakage, and exceptional durability in tight undercarriage spaces. Every unit is produced to the same specifications as the original supplier for leading mini excavator brands.
Emergency stopping with zero creep – The integrated wet multi‑disc parking brake engages automatically when travel control returns to neutral. It holds the machine on slopes and releases instantly when you move the joystick – no drift, no surge.
Small footprint, big torque – The compact PHV‑1B housing is designed to fit into the tight track frame of sub‑2‑ton mini excavators while still delivering the torque needed for professional digging. This means you can replace a worn final drive without modifying your machine’s undercarriage.
Plug‑and‑play replacement – Mounting dimensions, flange bolt patterns, sprocket bolt circle, and hydraulic port locations match the original unit exactly. Your mechanic swaps the old drive and bolts on this replacement without drilling, welding, or fabricating adapters.
Built‑in overload protection – Includes internal shockless relief valves and anti‑cavitation check valves that protect the motor from pressure spikes when the tracks suddenly meet a hard obstacle. The valves absorb the shock so your drive train does not.
Runs cool and quiet – The oil‑filled gearbox case continuously lubricates internal gears and bearings, reducing operating noise and preventing overheating during long travel cycles. Even in hot ambient conditions, the drive maintains consistent performance.
Designed for 1‑ton mini excavator duty – Rated for 0.8 to 2 metric ton class machines. Ideal for the tight spaces, delicate grading, and frequent repositioning that define compact excavator work.
Fast delivery – 5–8 working days lead time from our Guangzhou warehouse. Monthly supply capacity of 300 units.

2. Applications

The NACHI PHV‑1B‑12B‑PT is the standard final drive used on many 1‑ton class mini excavators, including CAT 301 series (301.4C, 301.5, 301.6, 301.7 CR, 301.8), Yanmar Vio20 and Vio25 series, Kobelco SK27SR‑5, Komatsu PC18/PC15R‑8, Kubota KX41/U15, and compatible models from Takeuchi, Bobcat, Hitachi and IHI. Its daily work covers:

• Landscaping & residential construction – Daily work includes digging foundations, grading, trenching for irrigation, and moving soil. Two‑speed travel allows fast repositioning around tight yards, while low‑speed torque handles roots, compacted clay, and rock. The smooth start‑stop characteristics prevent damage to finished paving surfaces.

• Utility trenching – Laying fiber optic cable, water lines, or electrical conduits often requires the excavator to creep along narrow trenches for hours at a time. The PHV‑1B’s precise low‑speed control keeps the machine tracking straight without constant steering corrections. The quiet hydraulic design reduces disturbance in residential or commercial zones.

• Rental fleet maintenance – Rental machines get heavy use from multiple operators. Final drives wear faster than privately owned equipment because renters often drive hard and ignore early warning signs. Having a genuine NACHI final drive on the shelf means a failed unit is swapped within an hour, not ordered and waited for days. Your machine stays on rent, earning revenue instead of sitting in the yard.

• Demolition & interior work – Small excavators working inside buildings for floor removal, wall demolition, or debris removal need precise travel control to avoid hitting structural elements. The wet disc brake holds the machine steady on any slope or uneven surface when the operator stops. The compact housing fits into doorways and narrow hallways.

• Agricultural & hobby farming – Mini excavators on farms are used for digging post holes, clearing brush, cleaning drainage ditches, and moving hay bales or manure. A reliable final drive means the machine stays in the field, not waiting for parts to ship from the city. The Japanese oil‑filled gearbox construction withstands dust, mud, and occasional submersion in wet field conditions.

• Municipal & roadside maintenance – Cities use mini excavators for sidewalk repair, sign installation, guardrail replacement, and storm drain cleaning. These jobs involve short travel distances and constant repositioning. The two‑speed shift allows quick moves between work zones and torque for breaking asphalt or concrete. Quiet operation avoids complaints from nearby businesses and homes.

3. FAQ – Frequently Asked Questions

Q1: Is this the correct replacement for my CAT 301 mini excavator?
A: The PHV‑1B‑12B‑PT is the genuine NACHI final drive used as original equipment on CAT 301.4C, 301.5, 301.6, 301.7 CR, and 301.8 mini excavators. We strongly recommend verifying fitment by sending your machine serial number and a photo of the old final drive – we confirm compatibility within 2 hours. Different undercarriage configurations (steel vs rubber tracks, fixed vs retractable) sometimes use different bolt patterns, and we match them.

Q2: What is the difference between PHV‑1B‑12B and the “‑PT” version?
A: The “‑PT” suffix generally denotes a specific port configuration or a particular OEM specification (such as Caterpillar’s 508‑1316). The core mechanical specifications (displacement, torque, mounting dimensions) are the same. For absolute certainty, send us your original unit’s photos and we match exactly.

Q3: Does this unit include a warranty?
A: The warranty period is 3 to 6 months depending on product details. As a genuine original Japanese part, we do not provide a separate manufacturer’s warranty, but we inspect every unit before shipping and send detailed photos for your approval. Defective components are excluded before they reach you, not after. For customers who require a longer warranty period, we can quote aftermarket alternatives – please ask our sales team.

Q4: How long does delivery take?
A: Delivery is 5–8 working days after order confirmation from our Guangzhou warehouse. Express shipping (DHL/FedEx/UPS) is available for urgent orders.

Q5: Do I need special tools to install this final drive?
A: Standard metric tools are sufficient. The final drive mounts with eight M10 bolts (frame flange) and nine M10 bolts (sprocket flange). Torque specifications are standard for M10 grade 10.9 fasteners. No special programming or calibration is required – it is a purely mechanical/hydraulic replacement.

Q6: What payment methods do you accept?
A: We accept T/T (wire transfer), XTransfer, PayPal, and Western Union. Payment terms are flexible based on order value and customer history.

Q7: Can you supply other NACHI final drive models?
A: Yes. We also stock PHV‑2B, PHV‑3B, PHV‑4B, and PHV‑5B series final drives for larger mini excavators. Contact us with your machine details and we will quote the correct model.

Q8: How do I know if my old final drive needs replacement?
A: Common signs include: oil leaking from the track motor area (failed floating seal), grinding or clicking noises when turning (worn planetary bearings or gears), the machine struggling to turn on level ground (internal hydraulic leakage), and the track creeping when the joystick is in neutral (failed brake). Any of these symptoms indicate final drive failure. Continuing to operate risks seizing the unit and damaging the track frame or sprocket.

Still have questions? Contact Hongtengda Parts – we reply within 24 hours.

4. Why Choose Hongtengda Parts?

Why does your 1‑ton mini excavator matter to a company that also supplies final drives for large mining machines? Because we have seen contractors shut down entire residential jobs over a $100 part that could have been on a shelf. The PHV‑1B‑12B‑PT is a small, lightweight final drive, but its failure paralyzes your machine just as completely as a failed swing motor on a 30‑ton excavator. The same day your machine is dead, you lose production, customer trust, and rental income. We keep these Japanese final drives in stock so you never wait weeks for a part that fits in a shoebox.

• 25+ years of industry experience – Founded in 2001, we have supplied final drives and hydraulic components for Caterpillar, Komatsu, Hitachi, Kobelco, Yanmar, Kubota, Bobcat, Takeuchi, IHI and over twenty other brands. We know which mini excavators use which NACHI series – and we verify fitment before shipping.

• 90% stock availability – CAT 301 / PHV‑1B‑12B‑PT final drives are in stock in our Guangzhou warehouse. We are not a drop‑shipper or a broker. The unit you order is physically on our shelf, inspected, photographed, and ready to go. No backorders. No chasing suppliers.

• 24‑hour shipment – From our Guangzhou hub to your forwarder in 1 day. International orders are shipped within 24 hours via sea, air, or express courier (DHL, FedEx, UPS, TNT). Most customers receive their final drive within one week.

• Pre‑shipment visual verification – We never ship a final drive blind. Before packing, we take clear, high‑resolution photographs of your unit, including the mounting flange, sprocket splines, port threads, and overall condition. You approve shipment – we do not ship without your confirmation.

• Professional export packaging – Each final drive is packed in a heavy‑duty, fumigation‑free wooden case with internal foam padding and corner bracing. This is not a cardboard box – your unit arrives undamaged whether shipped by air freight or lower deck of a container ship.

• One‑stop sourcing for mini excavator parts – Beyond final drives, we supply hydraulic pumps, swing motors, control valves, undercarriage components (track rollers, idlers, sprockets), engine parts, and full rebuild kits for CAT, Yanmar, Kobelco, Kubota, Takeuchi, Bobcat and all major mini excavator brands.

• Technical support before you buy – Not sure if the PHV‑1B‑12B‑PT fits your machine? Send us your serial number and a photo of the old final drive. Our workshop team will confirm compatibility, check bolt patterns, and verify port configurations within 2 hours. No guesswork.

• After‑sales technical assistance – After you receive your final drive, our support continues. If you have questions about installation, torque specifications, or brake testing, our engineers are available via email, WhatsApp, or video call.

Send us your CAT 301 (or Yanmar 20, Kobelco 27SR) machine serial number and a photo of the old final drive – we will confirm fitment and provide a quote within 24 hours.

Warranty note: The warranty period is 3 to 6 months depending on the product details. We do not provide warranty service for genuine original parts. Our inspection and pre‑shipment approval process is our commitment to quality. For customers who require a traditional warranty, we can quote aftermarket alternatives – please ask our sales team.

Installation tips for PHV‑1B‑12B‑PT:

1. Clean, clean, clean – Before removing the old final drive, pressure‑wash the track frame area to prevent dirt from entering the hydraulic system when you disconnect the hoses.

2. Cap all ports immediately – When disconnecting the hydraulic lines, use clean plastic caps or tape to seal the ports on both the new final drive and the machine hoses. A single grain of sand in the hydraulic circuit will cause valve and pump damage.

3. Replace the bolts – Always use new grade 10.9 or higher M10 bolts for both the frame flange and sprocket flange. Old bolts have been stretched and may lose clamping force. Overtightening or under‑tightening both cause failures.

4. Verify the sprocket bolt circle – The standard PHV‑1B uses a 9‑bolt sprocket pattern. However, some CAT 301 series machines use an 8‑bolt pattern. Measure your old sprocket flange before installation. If the pattern does not match, we can supply the correct sprocket or an adapter – contact us before you start the job.

5. Fill with correct gear oil – The planetary gearbox side of the final drive is shipped dry or with minimal preservative oil. Fill with SAE 90 or 80W‑90 gear oil (API GL‑4 or GL‑5) to the level specified in your machine manual (typically around 0.5 litres). Do not overfill – overfilling causes internal pressure buildup and seal failure.

6. Bleed the brake circuit – After installation and before full operation, cycle the travel controls several times with the engine at low idle to clear air from the brake release circuit. The machine may not move initially – that is normal until air is purged.

7. Track tension check – After installing the new final drive, verify track tension. A track that is too tight places excessive side load on the final drive output shaft bearing and can lead to premature failure.

Your mini excavator stops moving without a final drive. A genuine NACHI PHV‑1B‑12B‑PT from Hongtengda Parts gets your CAT 301, Yanmar 20, Kobelco 27SR, or compatible 1‑ton machine back on the job – not next month, but this week.