Редуктор хода Komatsu HMV160 708-8H-31160 для среднего экскаватора Komatsu PC300-6

PC300‑6 Final Drive for Excavator spare parts 708‑8H‑31160 HMV160 Axial Piston Motor Aftermarket

Product Overview

The Komatsu PC300‑6 is a 30‑ton machine built for heavy earthmoving and bulk excavation, and when one of these stops moving, the lost production adds up fast. The axial piston motor and planetary reducer under each track — referenced by part number 708‑8H‑31160 — is the component that turns hydraulic flow into the low‑speed, high‑torque rotation pulling such a heavy frame across site. Hours of ramp climbs, soft‑ground pushes and breakout loads wear the drive down in stages: first the tracks stop quite matching, then the machine drifts on level ground, the drive housing warms faster than its opposite, and a deepening note comes from the track motor. Left alone, a track eventually slips rather than pulls — by then the piston group and reduction gears are already scoring. This aftermarket drive reproduces the original motor‑and‑reducer pairing as one sealed, tested unit, so the worn assembly can come off and the new one bolt straight back on.

Core Advantages

1. Torque output matched to a 30‑ton frame
A machine this size meets real resistance on grades and broken ground. The motor's piston group and reduction gears are built to hold their output under load, so both tracks push evenly rather than one lagging or slipping.

2. Hardened gears for heavy‑duty track push
The planetary gear set is case‑hardened and precision‑cut with controlled backlash. Smooth, even meshing spreads the drive torque across the teeth, which is what keeps the gears quiet and durable through years of heavy track push.

3. Sealed for quarry dust and standing water
Large excavators work through long shifts in the harshest conditions. Fitted output‑shaft and housing seals keep grit out of the motor and reducer — the single most important protection against early abrasive failure.

4. One matched, tested unit for fast turnaround
Motor and reducer arrive pre‑assembled and bench‑checked, so the whole drive swaps in one operation. No sourcing separate parts, no mid‑job mismatches — essential when a stationary 30‑ton machine is losing money by the hour.

5. Aftermarket value for a high‑hour heavy excavator
An original Komatsu final drive exchange carries a serious price. This aftermarket unit restores track mobility at a fraction of the cost, with sample and batch supply for workshops keeping several PC300‑6 machines on the books.

Manufacturing & Quality Control

Each drive is built under controlled conditions: incoming material inspection, precision machining of housings and gears, hardening of wear surfaces and clean assembly. Before packing, every unit runs on a test bench to confirm output torque, internal leakage and running noise, and only passing assemblies are released. Preservation coating, moisture sealing and shock‑absorbing crating protect the drive during long‑distance transport.

Frequently Asked Questions

Q1: How do I confirm 708‑8H‑31160 matches my PC300‑6?

A: Compare the references on your existing drive and share your machine serial number. Komatsu build variants can differ, so we verify before dispatch.

Q2: Is this the complete motor and reducer?

A: Yes — the listing covers the full axial piston motor and planetary reducer as one assembly, ready to bolt on. Separate components can be checked on request.

Q3: What faults point to drive wear?

A: Uneven track speed, drifting on flat ground, a hot or noisy track motor and tracks that slip rather than pull under load. Inspect early, before debris spreads through the travel circuit.

Q4: What is the warranty position?

A: Manufacturing and material defects are covered. Damage from contaminated oil, debris in the motor, track obstruction, overload or incorrect installation is excluded; follow the Komatsu service manual for fitting and bleeding.