Volvo 55 / Volvo 60 Travel Motor Assembly – Genuine Nachi PHV-4B-70D-9657B (OEM 14694651)

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.

1. Overview – The Drive That Keeps Your Volvo Moving

The PHV-4B-70D-9657B is a factory‑spec travel motor built by Nachi‑Fujikoshi, a Japan‑based OEM supplier trusted by excavator manufacturers worldwide. It integrates a high‑efficiency axial piston hydraulic motor, a multi‑stage planetary gearbox, and a spring‑applied wet disc parking brake into a single compact housing. Designed for the 5–6 ton class, this travel motor powers your Volvo EC55, EC60 or compatible mini excavator through mud, slopes, and tight job sites – without aftermarket guessing or “rebuilt” uncertainty.

2. Key Features & Benefits

• Genuine Nachi PHV-4B engineering, made to OEM spec – Manufactured to Nachi‑Fujikoshi‘s original PHV-4B design, the same platform used by multiple excavator OEMs. This is a brand‑new unit – not remanufactured, not rebuilt, not a “re‑sealed” core. Your Volvo EC55 or EC60 receives the identical hydraulic architecture it left the factory with.

• Direct fit for Volvo EC55 / EC60 and compatible mini excavators – Precision‑engineered for Volvo EC55B / EC55C / EC55D / EC55E, EC60 / EC60C, as well as Sany SY55 / SY60, Komatsu PC45‑50, Kobelco SK60, Takeuchi TB145, Yanmar B50/VIO50, and other 5–6 ton class machines. Mounting flange bolt patterns, sprocket interface, and port configurations match factory originals – no drilling, no modifications, no adapters.

• Two‑speed travel for site‑to‑site productivity – Factory‑integrated two‑speed capability lets the operator switch between high‑speed repositioning (up to 4.3 km/h) and low‑speed, high‑torque crawling for trenching, climbing, and pushing through heavy material. An optional auto‑kickdown feature automatically shifts speeds based on load conditions for smoother operation.

• High output torque for demanding 5–6 ton applications – Maximum gearbox torque of 6,300 N·m (4,646 lbf·ft) provides the tractive force your Volvo needs for soft ground, steep grades, and heavy digging. Operating pressure of 24.5–27.5 MPa (3,550–4,000 psi) ensures consistent travel power without engine stall.

• Built‑in wet disc parking brake – Spring‑applied, hydraulically‑released multi‑disc brake with 3,200 N·m braking torque engages automatically when travel controls return to neutral, holding your 5–6 ton machine securely on slopes. Brake releases instantly when a travel command is given – no drift, no creep, no external brake hardware.

• All‑in‑one integrated construction – The PHV-4B combines the axial piston motor, planetary gearbox, counterbalance valve, shockless relief valve, and anti‑cavitation check valve in a single housing. Fewer external hoses and connections mean fewer leak points, lower maintenance, and greater reliability in the field.

• Smooth, quiet hydraulic operation – Built‑in shockless relief valves and anti‑cavitation check valves prevent hydraulic shocks and jerky movement – critical for work near finished surfaces, occupied buildings, and in residential neighbourhoods.

• Durable fluororubber shaft seal – The shaft seal is made of fluororubber (FKM), rated for -40°C to +150°C, ensuring reliable sealing in extreme cold or desert heat.

3. Applications

The Nachi PHV-4B-70D-9657B travel motor powers Volvo EC55 and EC60 series excavators across a wide range of industries:

• Urban construction & utilities – Sidewalk repairs, water and gas line trenching, fibre‑optic cable installation. The compact PHV-4B all‑in‑one design delivers precise travel control, while two‑speed shift allows fast repositioning on long street job sites. Smooth start‑stop characteristics prevent damage to finished surfaces.

• Residential landscaping & pool excavation – Pool digs, retaining walls, grading, and drainage work in residential neighbourhoods demand low noise and vibration. The PHV-4B‘s quiet hydraulic operation reduces neighbourhood complaints, and its high low‑speed torque provides the traction needed for compacted soil and clay.

• Agriculture & land management – Drainage ditch cleaning, irrigation trenching, pond maintenance, fence post holes, and light brush clearing. Enhanced sealing keeps water, silt, and organic debris out of the gearbox. High torque in low‑speed mode pulls the machine through soft, muddy fields.

• Mining support & quarry maintenance – Site cleanup, drainage maintenance, equipment pad grading. Abrasive dust and sharp rock fragments demand robust duo‑cone seals and case‑hardened planetary gears. The PHV-4B delivers both, with a full case‑hardened gear layer offering significantly longer life than reclaimed components.

• Equipment rental fleet maintenance – Mini excavators are among the most frequently rented machines. Multiple operators with varying driving habits accelerate wear on final drives. A genuine new travel motor provides predictable service life (5,000+ hours) and avoids costly mid‑rental failures, towing bills, and customer complaints.

• Forestry & vegetation clearance – Steep slopes, fallen timber, hidden obstacles. The wet disc parking brake holds the machine securely on inclines even with a loaded bucket, while low‑speed torque provides the pulling power needed to climb out of ditches and push through heavy brush.

4. Stock Availability – Hongtengda Parts

Your Volvo 55/60 mini excavator can‘t wait weeks for a travel motor – and neither should your job site. At Hongtengda Parts, we keep the Nachi PHV-4B-70D-9657B in stock in our Guangzhou warehouse, not sitting in a supplier’s backlog.

Why availability matters: A travel motor failure on a 5–6 ton mini excavator stops production completely. No forward. No reverse. The machine becomes a stationary obstacle. The difference between a week‑long emergency repair and a 24‑hour pit stop is one phone call – when the part is on your shelf.

• 300 pieces monthly supply capacity – Stable production and deep stock levels for the Volvo‑spec Nachi PHV-4B travel motor

• 90% of products in stock – Ready for immediate dispatch from our Guangzhou warehouse

• 24‑hour shipment – From our Guangzhou hub to your forwarder in 1 day; international orders shipped within 24 hours

• Professional export packaging – Fumigation‑free heavy‑duty wooden cases with internal bracing and foam padding for sea or air freight

• No MOQ pressure – One piece is enough to place an order

• Real‑time stock check – Email or message us anytime to confirm availability before payment

Why wait weeks for parts? Hongtengda Parts – where inventory meets urgency.

5. Why Choose Hongtengda Parts

At Hongtengda Parts, we have been supplying genuine and remanufactured undercarriage components for excavators since 2001. We know that a travel motor failure on a Volvo EC55 is not just a parts problem – it stops your entire job site.

When you buy a rebuilt travel motor, you are buying someone else‘s old wear. Here is what a typical “rebuilt” unit does not tell you: The cylinder barrel and valve plate are already worn. The bearings have fatigue cracks. The planetary gear teeth have pitting. The floating seal seat is no longer flat. No amount of new paint or new O‑rings can fix these problems – because metal does not grow back.

Our PHV-4B-70D-9657B is brand new – not “re‑sealed”. Every component meets Nachi’s factory tolerances. The cylinder barrel and valve plate are precision ground, ensuring minimal internal leakage and cooler operation. The bearings are new with correct preload. The planetary gear teeth have a full case‑hardened layer. The floating seal seat surface is smooth and flat – so the seals last 5,000+ hours, not 500.

New genuine. No story. No compromise. You install it once – then forget about it.

• 25+ years of industry experience – Founded in 2001, we have sourced genuine travel motors for Volvo, Caterpillar, Komatsu, Hitachi, Kobelco, SANY, XCMG, and more than fifteen other brands

• 90% stock availability – Nachi PHV-4B‑series travel motors for Volvo EC55/60 are in stock and ready for immediate dispatch from our Guangzhou warehouse

• 24‑hour shipment – From our Guangzhou hub (Zhucun, one of Asia‘s largest construction machinery parts distribution centres) to your forwarder in 1 day

• Pre‑shipment visual verification – We never ship a travel motor blind. Before packing, we send you clear, high‑resolution photographs of your actual unit – mounting flange, splines, port threads, casting marks, and general condition. You approve shipment – we do not ship without your confirmation

• One‑stop sourcing for Volvo undercarriage parts – Beyond travel motors, we supply complete undercarriage components (track chains, sprockets, track rollers, idlers, track shoes), hydraulic pumps, swing motors, control valves, and full rebuild kits for Volvo EC series excavators

• Technical support before you buy – Send us your Volvo EC55/EC60 machine serial number and a photo of the old travel motor. Our workshop team will confirm compatibility, check bolt patterns, and verify port configurations within 2 hours

6. Critical Installation & Maintenance Tips

Before starting the engine, follow these steps to protect your new travel motor:

Case drain line is the single most common installation point of failure. If the case drain line is blocked, kinked, or connected incorrectly, pressure will build inside the motor housing and blow the shaft seal instantly on first operation. Verify that the case drain line is clear, unrestricted, and properly routed back to the tank.

Gear oil – not hydraulic oil – in the planetary side. The planetary gearbox section requires SAE 90 or 80W‑90 gear oil (API GL‑4 or GL‑5). Hydraulic oil lacks extreme‑pressure additives and will cause rapid gear and bearing wear. Do not overfill – excessive gear oil creates internal pressure that can force oil past the floating seals.

Bleed the brake circuit after installation. Cycle the travel controls at low idle several times to purge air from the brake release circuit. The machine may not move initially – that is normal until the system is bled.

Mounting bolt torque: Use new grade 10.9 bolts. Torque to specification (refer to your Volvo machine manual). Overtightening can crack the cast housing; undertightening can cause loosening under vibration.

Floating seals are pre‑installed. Do not pry or strike the seal seating surfaces when mounting the final drive to the track frame.