Гидрораспределитель 4625137 для экскаватора Hitachi ZX350LC-3 ZX350-3

ZX350LC‑3 ZX350‑3 Control Valve Assy for Hitachi Excavator spare parts 4625137 Hydraulic Main Valve Aftermarket

Product Overview

A 35‑ton excavator on a hauling job is only as productive as the balance it keeps with the trucks it loads. The cycle is a rhythm: dig, swing, dump, swing back. Four or five passes fill a body, the truck leaves, the next one positions. That rhythm holds only while each pass takes the time it should. When the hydraulic block starts leaking internally, the cycle stretches — a slower dig, a swing that lands short, a bucket that sags and gets re‑spotted — and the trucks begin to queue. Queuing is the expensive part: haul units cost money whether they are moving or waiting.

The ZX350LC‑3 and ZX350‑3 use this hydraulic main valve, reference 4625137, to divide pump flow among boom, arm, bucket, swing, travel and auxiliary. Worn spools and bores let oil cross between circuits, so the machine loses time in every part of the cycle at once. This aftermarket assembly replaces the block complete with fresh internals set to Hitachi ‑3 values, so the worn unit comes off and the replacement fits the original port positions.

Core Advantages

1. Restores the rhythm the truck fleet expects
Each second added to the cycle shows up as waiting haul units. Restored metering returns the pass time the fleet was planned around.

2. Fewer re‑spots per body
A sagging boom forces a correction over the body. Renewed retention keeps the load where it was placed while the truck fills.

3. Swing lands first time
Restored circuit isolation removes the double‑input habit that breaks cycle rhythm on every swing.

4. Combined functions stop stealing from each other
Worn circuits pass oil when boom, arm and swing work together. Fresh spools hold pressure through combined operation.

5. Complete assembly keeps the whole chain working
A tested block arrives ready to fit, so the machine is out for a day rather than weeks of sequential repairs.

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 and compensator values logged against ‑3 figures; out‑of‑window units are stripped and corrected. Blocks ship internally oil‑fogged, ports capped, and crated on foam.

Frequently Asked Questions

Q1: How do I confirm 4625137 suits my ZX350‑3?
A: Send a photo of the tag from the existing valve and the machine serial number. This reference also appears on other ZX sizes, so we verify the configuration before dispatch.

Q2: What is the quickest way to prove the valve is costing cycle time?
A: Time ten loading cycles and count corrections — re‑spots, second swing inputs, throttle increases. Compare with the machine's normal rate.

Q3: What symptoms indicate valve wear?
A: Boom drift on held loads, lost arm force, inconsistent swing, and travel that reacts to bucket load. A circuit leak test confirms.

Q4: 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 usually gives better value. Photos help us judge.

Q5: What hydraulic servicing accompanies installation?
A: Flush the system, renew the return filter, clean the suction strainer, and refill with specified oil. Contaminated oil damages new clearances quickly.

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 crate before opening if damage is visible.