Transmissão final 31E9-30030 para midi escavadora Hyundai R290LC-3 R290-3

R290LC‑3 R290‑3 Final Drive for Excavator spare parts 31E9‑30030 Aftermarket

Product Overview

The Hyundai R290LC‑3 and R290‑3 are the older ‑3 generation 29‑ton Robex machines — the predecessor to the ‑7 and ‑9 series, built for crews who valued brute simplicity over modern electronics. Under each track frame sits the travel motor and planetary reducer, reference 31E9‑30030, that takes high‑pressure oil from the main pump and trades speed for the low‑speed torque pulling the machine across rough cut slopes and quarry benches.

On a ‑3 series Hyundai this age, the drive rarely gives a dramatic warning. It wears down in quiet stages: the two tracks stop quite matching, the machine drifts on level ground, the track shell warms after a trundle, and a note builds through the floor. Most crews nurse it until a track hesitates on a grade — but by then the piston block and valve plate have already been shedding swarf into the oil. This aftermarket unit reproduces the original motor‑and‑reducer pairing as one sealed, bench‑run assembly, covering both the LC and standard undercarriage, so the worn drive lifts out whole and the new one bolts straight in.

Core Advantages

1. Keeps an older Robex earning
Original 31E9‑30030 drives for the ‑3 series grow scarcer as the fleet ages. This aftermarket 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. Torque to pull a 29‑ton frame up ramps
Hardened gear stages multiply motor output down to sprocket speed, so the track digs in rather than spinning on muddy climbs. No laboured, whirring travel under a full bucket.

4. Sealed for quarry dust and standing water
‑3 series machines work through long days in quarry dust, mud and water. Fresh shaft and housing seals keep 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

Components are machined to the original ‑3 drawing, heat‑treated where wear bites, and assembled in a clean area. Each finished drive runs on a hydraulic stand while torque, leakage and noise are checked; units outside tolerance are reworked before packing. The internals are fogged with preservation oil, ports are plugged, and the unit is crated on dunnage for freight.

Frequently Asked Questions

Q1: Is 31E9‑30030 the same as the later R290‑7 drive?
A: The ‑3 and ‑7 series use related but not always identical drives. Mounting and porting can differ between generations. Send the serial number and we will tell you honestly whether it crosses over.

Q2: How do I tell the LC and standard undercarriage apart?
A: The LC has a longer track frame and wider shoe spacing. If unsure, send a side photo and the serial number — we will confirm which you have.

Q3: 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.

Q4: What should I do with the old drive?
A: It is yours to keep. Many workshops send failed motors to a local rebuilder for cores; if you want, we can advise on what parts inside are usually salvageable.

Q5: What is the warranty position?
A: Materials and build 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.