4410248 hydraulic control valve for Hitachi ZX120-6 EX120-6 midi excavator
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Product Overview
The ZX120‑6 and EX120‑6 carry two names for one working reality: a 12‑ton Hitachi built for utility trenching, roadwork prep and small‑site excavation, where the operator is judged on how clean the edge of the trench comes out. The hydraulic main valve, OEM reference 4410248, is the component that decides that. It takes pump flow and divides it among boom, arm, bucket, swing and tracks, and the quality of that division is felt directly in the bucket's edge.
A valve on this machine does not fail with a bang. It degrades, and the operator compensates without realising. The boom creeps down while a bucket is held above a trench, so the pass is re‑cut. The arm settles at idle, so the first movement of each cycle is wasted taking up slack. The tracks pull unevenly when the bucket is loaded. Worn spools and scored bores inside the block are allowing oil to cross between circuits. This OEM‑grade assembly replaces the block in one piece with fresh internals trimmed to Hitachi specification, so the old unit comes off and the replacement goes on in the original hose positions.
Core Advantages
1. Clean trench edges come back
Utility work is judged on finish. Restored metering means the bucket stops where the operator stops it, so walls come out straight instead of needing a trim pass.
2. No wasted movement at the start of each cycle
An arm that settles at idle costs the first inch of every stroke. Fresh clearances keep the cylinder loaded, so the operator's lever input translates straight into bucket movement.
3. Boom holds while the operator checks grade
A drifting boom forces the operator to hold pressure on the lever instead of looking at the work. New spool pairs keep the load where it was placed.
4. Tracks stay even under load
When the block leaks across circuits, travel speed becomes inconsistent with bucket load. Restored separation keeps both tracks pulling together on soft ground and grades.
5. OEM‑grade build at aftermarket economics
Original 4410248 units carry dealer pricing. This assembly delivers equivalent clearances and tested pressure settings at a fraction, with tiered pricing for workshops holding several Hitachi 120s.
Manufacturing & Quality Control
Spool‑and‑bore pairs are finished to print, then individually run‑in by hand until movement is free of stick‑slip. Each assembled block is flow‑tested circuit by circuit with relief values logged against the Hitachi specification; out‑of‑window units are disassembled and corrected. Blocks are internally oil‑fogged, all ports capped, and shipped in foam‑lined crates sized for the assembly.
Frequently Asked Questions
Q1: Is 4410248 used on both the ZX120‑6 and EX120‑6?
A: The two designations cover the same 12‑ton platform, and the reference is shared. Send the serial number and a photo of the old valve tag so we confirm the exact build before dispatch.
Q2: How can I tell valve wear from cylinder wear?
A: A leaking cylinder drifts slowly and steadily on one function only. Valve wear shows across several circuits and gets worse as oil warms. A circuit leak test confirms which.
Q3: What is the realistic swap time?
A: With the side panel open and the machine cool, removal and refit run most of a working day, plus bleed and pressure check. Plan the machine out of the schedule for one day.
Q4: Do the hoses need to be replaced at the same time?
A: Only if they are cracked, swollen or have been over‑tightened at the fittings. Otherwise reuse them and inspect the ends for crushed flares while the block is off.
Q5: Can this block be used on the ZX120‑5 or EX120‑5?
A: The previous generation uses different porting and relief settings. It is not a straight swap. Give us the model and serial and we will identify the correct reference.
Q6: Which failures are excluded from cover?
A: Material and workmanship faults are covered. Damage from contaminated oil, water ingress, a spool forced against a mechanical bind, or reliefs altered outside spec is not. Photograph the packaging before unwrapping if it arrives damaged.