JCB 8026 CTS Final Drive Travel Motor With Gearbox 333/S0071 Nachi Original PHV-390-53B-1-8940A For Mini Excavator Parts

• Product: Original Nachi Final Drive Travel Motor with Gearbox
• OEM Numbers: PHV‑390‑53B‑1‑8940A, 333/S0071
• Compatible Models: JCB 8026 CTS Mini Excavator
• Application: Mini Excavator Crawler Travel System Parts
• Condition: Original New
• Note: Complete integrated assembly combining travel motor and planetary reduction gearbox

• Genuine Nachi OEM unit, precisely matched to JCB original performance curve for crawler travel
• Compact integrated housing optimizes space usage inside narrow mini‑excavator track frame
• Wear‑resistant piston assembly and case‑hardened planetary gears withstand muddy site working conditions
• Factory pre‑tested assembly, no extra tuning required after mounting to chassis

• Assembly Type: Integrated final drive (axial piston travel motor + multi‑stage planetary reduction gearbox)
• Function: Output driving torque for crawler movement, pivot turn and slope climbing
• Internal Build: Piston motor group, planetary gear sets, spring‑applied wet multi‑disc parking brake
• Hydraulic Fluid: Anti‑wear hydraulic oil ISO VG46
• Gearbox Lubricant: Gear oil ISO VG150
• Rated Working Pressure: 25.0 MPa
• Max Instant Peak Pressure: 28.0 MPa
• Brake Mode: Spring‑engaged, hydraulic‑released parking brake for slope holding
• Mounting Interface: Exact match for original bolt circle, spigot dimension and oil port layout
• Sprocket Fitting: Compatible with original track sprocket for stable crawler transmission
• Bench Validation: Travel speed test, brake holding torque test, pressure retention, internal leakage and noise inspection
• Weight: 39kg approx

Q1: Does this assembly include the sprocket?

A1: Sprocket is not included in standard supply, can reuse original matched sprocket if wear condition is acceptable.

Q2: What maintenance should be performed after installing this final drive?

A2: Refill gear oil to specified level, replace hydraulic return filter, avoid high‑speed sharp turn during running‑in period.

Q3: Why does the excavator drift when travelling straight?

A3: Possible causes include internal motor wear, inconsistent system pressure between two travel circuits or brake dragging.