ناقل الحركة النهائي Hitachi 9244944 9256991 لـ حفارة متوسطة الحجم Hitachi ZX270-3

ZX270‑3 Final Drive for Hitachi Excavator spare parts 9244944 9256991 Travel Motor Assembly OEM

Product Overview

Inside every track of a Hitachi ZX270‑3 sits two components working as one: an axial piston motor that turns hydraulic pressure into rotation, and a planetary reduction that multiplies that rotation into the low‑speed, high‑torque force needed to pull a 27‑ton machine across site. The travel motor assembly carrying Hitachi references 9244944 and 9256991 is exactly this paired unit. Hours of rutted ground, steep slopes and constant forward‑reverse manoeuvring take their toll in stages — first a slight unevenness between the two tracks, then a rising pitch from one final drive, then heat, then a track that simply refuses to pull. By the time it stalls, the piston group and reduction gears are usually already scored, so waiting only deepens the repair. This OEM‑grade assembly reproduces the original motor‑and‑gearbox pairing as a sealed, tested unit, so the worn drive can be unbolted and the new one fitted without cross‑matching separate parts.

Core Advantages

1. A piston group built for the pressures a 27‑ton track demands
The motor's piston, cylinder block and valve plate are finished to OEM clearance levels. Tight internal sealing means the motor holds its pressure under load, so both tracks pull evenly and the machine does not fight itself by wandering on flat ground.

2. Hardened reduction gears that wear slowly and quietly
The internal planetary gear set is case‑hardened and precision‑cut, with backlash held to spec. That keeps meshing smooth and silent — a sign the load is spread across the teeth rather than concentrated on a few, which is how gears last.

3. Seal design that keeps site grit where it belongs
Tracks throw mud, sand and water at the final drive all day. Factory‑fitted seals at the output shaft and housing joints keep contaminants out of the motor and gear oil, protecting the internals from the abrasive wear that puts so many drives into early failure.

4. One matched unit, one clean installation
Because the motor and reduction are supplied as a pre‑assembled, tested pair, the fitter does not have to match components from different sources. The unit bolts onto the original mounting and reconnects to the existing hydraulic lines — the repair is done in a single swap.

5. OEM‑spec build at an aftermarket‑friendly price
An original Hitachi final drive exchange carries a premium price. This OEM‑grade unit is built to the same fit and performance standard, giving workshops and fleet owners a dependable option with sample and bulk supply available.

Manufacturing & Quality Control

Production is traceable from incoming steel through machining, hardening and assembly under clean conditions. Before packing, every travel motor assembly runs on a test bench to check output torque, internal leakage and operating noise; only units meeting the acceptance limits are released. Completed drives are preservation‑coated, sealed against moisture and crated to survive long‑distance sea and overland freight.

Frequently Asked Questions

Q1: How do I know whether I need 9244944 or 9256991?
A: The two references cover build variants of the ZX270‑3 travel motor. Send us the tag off your old unit, or the machine serial number, and we will confirm the correct match before dispatch.

Q2: Does this assembly come with seals already fitted?
A: Yes — the unit is factory‑fitted with output‑shaft and housing seals and ready to install. We recommend bleeding the travel circuit after fitting and checking the oil level before operation.

Q3: Can this be installed on either the left or right track?
A: The travel motor assembly is side‑specific in some configurations. Please tell us which track you are replacing, or match the old part number, and we will supply the correct unit.

Q4: What is not covered under warranty?
A: Defects in material and workmanship are covered. Damage caused by contaminated travel oil, debris entering the motor, track obstruction, running a failed drive until it seizes, or incorrect installation is excluded — follow the Hitachi service manual for the procedure.