Rozvodovka 31EM-40011 na midi bagra Hyundai R210-3

R210‑3 Final Drive for Hyundai Excavator spare parts 31EM‑40011 Travel Motor with Reduction OEM

Product Overview

The Hyundai R210‑3 is an older 21‑ton Robex — the ‑3 generation that predated the ‑7 and ‑9 series, built for crews who valued simplicity and low running costs. Under each track frame sits the travel motor with reduction, reference 31EM‑40011, that takes high‑pressure oil from the main pump and turns it into the slow, steady pull moving the machine across subdivisions, pipeline trenches and roadwork sites.

On a ‑3 series Hyundai this age, the drive wears down in quiet stages that are easy to dismiss. The operator notices the two tracks no longer quite match on a long straight, that the track shell warms after a shorter trundle than it should, and that a low whine creeps into the circuit under load. Most crews nurse it another week — but by then the piston group and reduction gears are already shedding swarf into the travel oil. This OEM‑grade unit reproduces the original motor‑and‑reducer pairing as one sealed, bench‑tested assembly, so the worn drive lifts out whole and the new one bolts straight in.

Core Advantages

1. Keeps an older Robex earning
Original 31EM‑40011 drives for the ‑3 series grow scarcer as the fleet ages. This OEM‑grade unit gives owners a path to keep a still‑useful machine on the job rather than writing it off over a dead track.

2. Simple, tough gearing that wears slowly
The ‑3 drive has none of the complexity of later Robex machines — just hardened planetary teeth meshing cleanly. No electronics to fail, just gears that last when kept sealed.

3. Even pull between the two tracks
A lapped piston block and valve plate hold pressure internally, so neither track lags. The machine tracks straight across a yard without the operator fighting a sideways tug.

4. Sealed for mud and dust of old‑site work
‑3 series machines work through long days in clay, dust and standing water. Fresh shaft and housing seals keep that grit out of the lube — the protection that decides whether the drive reaches its next overhaul.

5. A direct, no‑nonsense fit
Flange, studs and ports reproduce the original, so removal and refitting follow the old Hyundai manual. No adapters, no fabrication, no guessing.

Manufacturing & Quality Control

The OEM‑grade route follows controlled specifications: material certification, precision machining of housings and gears, case hardening of wear surfaces and clean assembly. Each completed drive runs on a test rig to verify output torque, internal leakage and running noise before release, and only passing units are packed. Full preservation coating, moisture sealing and shock‑absorbing export casing protect the assembly during transport.

Frequently Asked Questions

Q1: Is 31EM‑40011 the same as the R210‑7 drive?
A: The part number crosses across Robex generations, but internal specifications can differ between the ‑3 and ‑7 series. Send the machine serial number and we confirm before dispatch rather than assuming.

Q2: Is this the complete motor and reducer?
A: Yes — the listing covers the full travel motor with planetary reduction as one assembly, ready to bolt on. If you need only internal parts, ask and we will check availability.

Q3: What symptoms mean the drive is tired?
A: Mismatched track speeds, pulling to one side, a warm or noisy track motor, and hesitation under load. Catch it before swarf spreads through the travel circuit.

Q4: Can a home workshop fit this?
A: The swap needs a track‑frame lift and basic hydraulic tools. If you already service undercarriages, it is a straightforward day job; otherwise use a mobile fitter.

Q5: What is the warranty position?
A: Manufacturing and material defects are covered. Damage from dirty oil, debris in the motor, track obstruction, overload or incorrect fitting is excluded. Photograph any arrival damage before uncrating.