Hydraulic control valve for Hitachi EX70 mini excavator
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Product Overview
Some of the hardest parts to buy are the ones with no part number attached. An EX70 is an older 7‑ton Hitachi, sold in numbers across many markets, built over a long period with internal changes that the model badge does not show. Owners searching for a main control valve often find listings without any reference at all, and the practical question becomes identification: which of the variants is on this machine. That is answered by the valve itself — the tag on the existing block, the number of sections, the port layout and the mounting pattern.
This hydraulic main valve divides pump flow among boom, arm, bucket, swing, travel and auxiliary on the EX70 platform. Where the block has worn, the symptoms are the familiar ones: the boom sags on a held bucket, the arm loses force in clay, swing lands short, travel hesitates under load. This aftermarket assembly replaces the block complete with fresh internals set to working values, so the worn unit comes off and the replacement fits the original port positions.
Core Advantages
1. Identified from the machine, not from a missing number
No reference on the listing is not a dead end. Photos of the existing valve and its tag let us match section count, porting and mounting before shipping.
2. Restores force at the cutting edge
Renewed spools put pressure back into the arm and bucket, so a 7‑ton machine digs like one rather than labouring.
3. Loads hold while grade is checked
Drift on a held bucket forces constant lever pressure. Fresh pairs keep the load steady.
4. Swing placement becomes predictable
Restored circuit isolation ends the overshoot habit that costs time on every placement.
5. Complete assembly avoids guessing at individual sections
Where several circuits have drifted, one tested block settles them together instead of one repair visit after another.
Manufacturing & Quality Control
Spool and bore pairs are machined to print tolerance, matched by size, and hand‑run‑in until full‑stroke movement is free of binding. Assembled blocks are flow‑tested circuit by circuit with relief values logged against platform figures; out‑of‑window units are stripped and corrected. Blocks ship internally oil‑fogged, ports capped, and packed in compact foam‑lined crates.
Frequently Asked Questions
Q1: My machine has no part number on the listing — how do I order?
A: Send clear photos of the existing valve from several angles, its tag if present, and the machine serial plate. Section count, porting and mounting pattern identify the variant.
Q2: What symptoms indicate valve wear?
A: Boom drift on held loads, lost arm force, inconsistent swing placement, and travel that hesitates under load.
Q3: Can my existing block be rebuilt?
A: If the casting is sound and has never been rebuilt, a kit may restore it. Where several circuits leak, a complete assembly is usually better value. Photos help us judge.
Q4: What hydraulic servicing accompanies installation?
A: Flush the system, renew the return filter, clean the suction strainer, and refill with specified oil. Compact circuits are sensitive to debris.
Q5: Can this ship by express?
A: Yes. A block for a 7‑ton machine travels well by air or express and usually arrives faster than sea freight for a single unit.
Q6: What is excluded from warranty?
A: Material and assembly faults are covered. Damage from dirty oil, water ingress, a spool forced against a bind, or reliefs altered outside specification is not. Photograph the packaging before opening if it arrives damaged.