SANY 55 / SANY 60 Travel Motor Assembly – Genuine Nachi PHV-4B-70D-PST Final Drive (Factory Direct)

Description

Detail Information

1. Key Features & Benefits

• Factory‑new Nachi PHV-4B design – OEM specification PHV-4B-70D-PST travel motor, manufactured to Nachi‑Fujikoshi‘s original dimensions and performance standards. This is a brand‑new unit – not remanufactured, not rebuilt, not a “re‑sealed” core. Nachi is an original equipment supplier to leading excavator manufacturers worldwide.

• Direct fit for SANY 55/60 and many 5–6 ton mini excavators – Precision‑engineered for SANY SY55, SY55C, SY60, SY60C, as well as Komatsu PC45/50/55, Volvo EC55, Kobelco SK60, Takeuchi TB145, Yanmar B50/VIO50, Yuchai YC55, and other 5–6 ton class machines. Mounting flange bolt pattern (9 holes), sprocket interface, and hydraulic port configurations match factory originals – no drilling, no adapters.

• All‑in‑one integrated travel drive – Combines a high‑efficiency swashplate axial piston motor, multi‑stage planetary gearbox, and spring‑applied wet parking brake in a single compact housing. Factory‑integrated counterbalance valve, shockless relief valve, anti‑cavitation check valve, and speed control valve reduce external hoses and potential leak points.

• Two‑speed travel capability – Standard dual‑speed function allows operators to switch between high‑speed site repositioning and low‑speed, high‑torque crawling for trenching, heavy digging, or climbing slopes. Optional auto‑kickdown feature automatically shifts speeds based on load conditions.

• High torque for its class – Maximum gearbox output torque of 6,300 N·m (4,646 lbf·ft) provides the tractive force needed for soft ground, steep grades, and pushing through heavy material. Operating pressure of 24.5–27.5 MPa (3,550–4,000 psi) ensures consistent travel power without engine stall.

• Built‑in wet parking brake – Spring‑applied, hydraulically‑released multi‑disc brake engages automatically when travel controls return to neutral, holding the machine securely on slopes. Brake releases instantly when a travel command is given – no drift, no creep.

• Smooth, quiet operation – Shockless relief valves and anti‑cavitation check valves prevent hydraulic shocks and jerky movement, critical for work near finished surfaces or occupied buildings.

• Pre‑shipment visual verification – We send you detailed high‑resolution photographs of the actual unit (mounting flange, splines, port threads, castings) before packing. You approve shipment – we never ship blind.

• Fast delivery – 5–8 working days lead time from our Guangzhou warehouse. Monthly supply capacity of 300 units.

3. Applications

The Nachi PHV-4B-70D-PST travel motor is the standard final drive for 5–6 ton mini excavators across multiple industries:

• Urban construction & utilities – Sidewalk repairs, water/gas line trenching, fibre‑optic cable installation. The compact design and smooth start‑stop characteristics allow precise maneuvering in tight spaces without damaging finished surfaces. Two‑speed travel enables fast repositioning along long street job sites.

• Residential landscaping & pool excavation – Quiet hydraulic operation reduces noise complaints in neighbourhoods, while high low‑speed torque provides the traction needed for digging foundations, grading, and drainage work in compacted soil or clay.

• Agriculture & land management – Drainage ditch cleaning, irrigation trenching, pond maintenance, fence post holes. The enhanced sealing system keeps water, silt, and organic debris out of the gearbox, and the high torque output 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 floating seals and case‑hardened planetary gears – the PHV-4B delivers both.

• Rental fleet maintenance – Mini excavators are among the most frequently rented machines. A genuine new final drive 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, and low‑speed high‑torque mode provides the pulling power needed to climb out of ditches and push through heavy brush.

• Demolition & recycling – Intense vibration, sharp debris, repeated impacts. The cast iron housing and case‑hardened planetary gears absorb extreme shocks, while anti‑cavitation valves protect the motor during sudden direction changes.

4. Why Choose Hongtengda Parts – End the Cycle of Rebuilt Failures

If you have replaced your travel motor twice with “rebuilt” units, only to see leaks, noises, and power loss return within 800 hours – that is not bad luck. That is the hidden cost of buying someone else’s old wear.

Here is what a typical “rebuilt” final drive 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-PST is brand new – not “re‑sealed”. Every component meets Nachi’s factory tolerances. The cylinder barrel and valve plate are precision ground to 0.002mm, ensuring minimal internal leakage and cooler operation. The bearings are new with correct preload. The planetary gear teeth have a full case‑hardened layer, offering five times the life of pitted reclaimed gears. The floating seal seat surface is smooth and flat, so the seals last 5,000+ hours – not 500.

Total cost comparison over 5 years (assuming 1,500 hours/year):
A rebuilt route typically costs $3,100–$4,100 including the initial unit, two or three subsequent failures, towing, and repeated labour. A new genuine PHV-4B costs $2,300–$2,800 installed once – with zero unplanned downtime. Rebuilt is not cheaper; it is a subscription to repeated failures.

Hongtengda Parts – 25+ years in the excavator parts industry. We stock genuine Nachi PHV-4B final drives in our Guangzhou warehouse. 90% of our inventory is ready for immediate dispatch. We offer 24‑hour shipment, professional wooden case packaging, and pre‑shipment photo approval. You install once – then forget about it.

Send us your SANY 55/60 machine serial number or a photo of the old travel motor – we will confirm compatibility and provide a quote within 24 hours.

Critical installation tip:
– The case drain line must be clear and unrestricted. A blocked drain will blow the shaft seal instantly.
– Fill the planetary side with SAE 90 or 80W‑90 gear oil (API GL‑4 or GL‑5) – never use hydraulic oil in the gearbox.
– After installation, cycle travel controls at low idle several times to bleed air from the brake circuit. The machine may not move immediately – that is normal.

Warranty note: Warranty period is 3 to 6 months depending on product details. We do not provide warranty service for genuine original parts. Our value is delivered up front: new components, factory tolerances, and pre‑shipment visual verification. For warranty‑covered alternatives, ask our sales team.

The travel motor is the only link between hydraulic power and track movement. A genuine new PHV-4B-70D-PST from Hongtengda Parts ends the cycle of rebuilt failures – and gets your SANY 55/60 back to work for years, not months.