20/901800 20/905600 Final Drive for JCB 802.7 803 804 PLUS | Nachi PHV-3B Travel Motor

High-Torque 4114 N·m Tractive Power for 2.7–4.0T JCB Earthmovers. Direct OEM replacement Nachi PHV-3B hydraulic travel motor and planetary reduction gearbox assembly, engineered specifically for JCB 802.7, 802.7 PLUS, 803, 804, and 804 PLUS mini excavators.

1. Technical Operating Specifications

(Authority verified via JCB EPC catalogs & Nachi hydraulic engineering databases)

2. Complete Component & Modular Breakdown Matrix

(Cross-reference complete final drive assemblies, gearbox hubs, and motor cores)

3. Resolving JCB 803/804 Drive Spline Stripping & Pressure Bleed

Hearing harsh rattling under heavy dozer-blade leveling, or losing track drive traction on asphalt cuts? JCB compact excavators are workhorses in urban roadworks and deep foundation digging. Operating at high system pressures (26.0 MPa) generates punishing peak torque shock. Over high service hours, internal connection splines between the hydraulic motor and gearbox hub suffer fretting corrosion, causing power slip. Concurrently, worn distributor valve plates bleed high-pressure fluid directly into the return line, sapping your low-speed 4114 N·m pushing power. Installing our precision-balanced 20/901800 complete assembly reinstates full tooth-contact rigidity, stops fluid bypass, and delivers continuous, straight-line tracking.

4. Frequently Asked Questions (Technical & Commercial)

For Machine Owners & Operators (C-End Insights)

Q: Will this complete final drive bolt straight onto my JCB 803 without changing the drive sprocket? A: Yes. It matches OEM assembly part numbers 20/901800 and 20/905600 directly. The chassis frame mounting pattern, sprocket pitch diameter, and main hydraulic feed port threads conform strictly to factory JCB specifications.

Q: Can I purchase just the planetary gearbox (20/901810) or just the hydraulic motor (20/905617)? A: Yes. We supply individual modular sections. However, if internal bearing failure has contaminated your existing unit with metal shavings, installing a complete pre-calibrated assembly (20/901800) eliminates cross-contamination risks and provides full 12-month warranty protection.

For Equipment Dealers & Repair Facilities (B-End Insights)

Q: How do part numbers 20/901800 and 20/905600 relate across JCB model ranges? A: 20/901800 and 20/905600 are direct factory interchangeable assembly part numbers across the entire JCB 802.7, 803, and 804 lineup, allowing you to service all five machine variants with a single inventory SKU.

Q: What is the overseas export crating and transit preservation standard? A: Each drive unit is internally coated with corrosion-inhibiting oil, vacuum-sealed in a heavy-gauge vapor corrosion inhibitor (VCI) poly barrier bag, and bolted securely inside an ISPM-15 certified fumigated wooden crate built for container and air freight handling.