Komatsu PC200-7 PC200-8 PC200LC-7 PC200LC-8 中型バックホーのための723-46-20403 油圧ディストリビュータ

PC200‑7 PC200‑8 PC200LC‑7 PC200LC‑8 Control Valve Assy for Komatsu Excavator spare parts 723‑46‑20403 723‑46‑23103 Distributor Aftermarket

Product Overview

The PC200 is the most common excavator class in the world, and across its ‑7 and ‑8 generations — standard and long‑undercarriage alike — the distributor is the component every operator relies on without thinking about it. The control valve assembly, referenced as 723‑46‑20403 and 723‑46‑23103, takes full pump flow and meters it to boom, arm, bucket, swing and tracks. On a well‑tuned PC200, the machine digs, swings and tracks in one continuous motion; the valve's flow sharing is what makes that possible.

On a worked Komatsu, valve wear shows up as a slow loss of composure. The boom drifts down while holding a loaded bucket, the arm creeps when parked on a slope, the swing overshoots and hunts, and the tracks surge when an attachment is cycled. Internally, worn spools and scored bores are letting oil bleed across the lands, robbing each circuit of pressure. This aftermarket distributor replaces the whole assembly with fresh internals, pre‑set to the correct Komatsu pressures, so the old block comes off and the new one bolts straight back on with the same hoses.

Core Advantages

1. Two references cover four PC200 builds
The part numbers span the ‑7 and ‑8 generations and the LC undercarriage variants. Send the machine serial number and we supply the correct block — no guessing across the most common excavator on earth.

2. The boom stops giving away its load
Drift under a loaded bucket is oil escaping past worn spool lands. New spool‑and‑bore pairs hold pressure where the lever leaves it, cutting the constant re‑spotting that slows production.

3. Swing metering comes back to the operator
Scored bores make the house unpredictable — overshoot, then a hunt back to the mark. Lapped spools restore clean rotation, so the operator can swing and spot the bucket without fighting the machine.

4. Track and work circuits stop robbing each other
The distributor decides flow priority between travel and attachments. New internals put that order back to Komatsu's design, ending the surge when the bucket is dumped and the tracks grab.

5. A complete block for the world's most‑serviced machine
Workshops everywhere know the PC200 undercarriage and plumbing. Swapping in this tested assembly is one clean exchange with the same hose positions — a day's job on a machine built to be serviced.

Manufacturing & Quality Control

Spool and bore pairs are finished to close clearance and run‑in on the bench to confirm free movement without stick‑slip. Each completed valve is flow‑tested across its circuits, with relief and compensator settings logged before acceptance; anything off spec is stripped and reworked. The finished block is oil‑fogged, port‑plugged and crated on shock‑absorbing dunnage.

Frequently Asked Questions

Q1: Which part number suits my machine?
A: Read the tag on your existing valve against 723‑46‑20403 or 723‑46‑23103 and send the machine serial number. The references span ‑7 and ‑8 builds, so we confirm the exact block before dispatch.

Q2: Can a worn distributor be repaired?
A: If the block casting is sound, a re‑spool and seal kit often restores it. But on a machine this common, replacement with a tested assembly is usually the faster, safer cost.

Q3: What should be changed alongside the valve?
A: The hydraulic oil and filters. Flush the circuit, change the return filter and suction strainer, so the new spools start life in clean oil rather than the swarf that killed the old block.

Q4: How long does the exchange take?
A: A competent mechanic swaps the block in a working day once the side cover is open, then bleeds and pressure‑verifies before the machine returns to loading.

Q5: Does this fit the PC200LC‑8 as well as the standard?
A: The LC and standard builds share the same distributor platform. Send the serial number and we confirm the correct variant for your track length.

Q6: What voids the warranty?
A: Materials and build defects are covered. Damage from contaminated oil, water ingress, a seized spool forced into movement or incorrect pressure adjustment is excluded. Photograph any arrival damage before uncrating.