31E6-42000 final drive for Hyundai R140LC-7 R140-7 midi excavator
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Product Overview
The Hyundai R140LC‑7 and R140‑7 are 14‑ton Robex machines that sit in the sweet spot for roadwork and utility crews — big enough to dig a serious trench, light enough to trailer between jobs without special permits. Under each track frame sits the axial piston motor and planetary reducer, covered by references 31E6‑42000 and 31N5‑40060, that takes high‑pressure oil from the main pump and turns it into the slow, torque‑rich pull moving the machine across uneven ground.
On a worked 14‑ton Hyundai, the drive wears down in small increments first. One track lags the other on a long straight, the track shell warms after a shorter trundle than it should, and a low note 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, covering both the LC and standard undercarriage, so the worn drive lifts out whole and the new one bolts straight in.
Core Advantages
1. One range covers both undercarriage lengths
The 31E6 and 31N5 references cover the LC long‑undercarriage and standard R140‑7 builds, so workshops running a mixed Hyundai fleet keep one range on the shelf rather than two.
2. Fine track control around trenches
Roadwork and utility sites demand feathered track modulation. A lapped piston block and valve plate hold pressure without internal slip, so the operator can position the machine precisely between pipe runs.
3. Hardened gears for repeated reversing
Utility work means backing up and repositioning all day. Case‑hardened planetary teeth absorb that cycle, and controlled backlash keeps the drive quiet on residential streets.
4. Sealed for dust, mud and pressure washing
Road sites throw up dust, slurry and washdown water. Fresh shaft and housing seals keep that grit out of the lube — the protection that decides whether the drive reaches its first overhaul.
5. OEM‑spec build without the dealer price
Renewing the drive to original tolerances restores the R140's mobility at a fraction of a Hyundai dealer exchange unit, with sample and bulk supply for workshops keeping compact Robex machines on the books.
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: 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.
Q2: Will this fit other Robex 14‑ton variants?
A: The R140 range shares the drive platform, but mounting and porting can differ by year. Send the machine serial number and we confirm before dispatch.
Q3: What break‑in should the operator follow?
A: Take the first shift easy on loaded grades. Light cycling seats the new gears and seals, then check oil level and fitting torque after the first day.
Q4: Can I ship this by sea to African ports?
A: Yes — drives this size ship well by sea. Tell us the destination port and we will quote door‑to‑port or door‑to‑door, including any inland trucking needed.
Q5: What if the part number on my machine is different?
A: Send a photo of the old drive's ID plate and the machine serial number. We cross‑reference against our catalogue and tell you honestly whether it matches, even if that means we cannot supply it.