723-27-50900 hydraulic control valve for Komatsu PC60-8 PC70-8 PC78US-6 mini excavator
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Product Overview
The PC60‑8, PC70‑8 and PC78US‑6 are Komatsu's compact class — 6‑to‑8 ton machines that squeeze into backyards, utility easements and foundation trenches where a 20‑ton machine cannot go. On a machine this small, the distribution valve is what makes the difference between workable and clumsy: it takes the pump's modest flow and meters it precisely to boom, arm, bucket, swing and tracks, so the operator can feather a bucket between pipes or hold a grade beside a house foundation.
On a worked compact Komatsu, valve wear shows up as the machine losing its manners. The boom drifts down while holding a bucket, the blade or bucket settles during an idle, the swing becomes jerky and overshoots, and the tracks surge when an attachment is cycled. Inside the block, worn spools and scored bores are letting oil bleed across circuits. This aftermarket distribution valve assembly, covered by references 723‑27‑50900 and 700‑23‑46001, replaces the whole block with fresh internals, set to the correct pressures for each model, so the old valve comes off and the new one bolts straight back on.
Core Advantages
1. One range covers three compact models
The distribution valve family spans the PC60‑8, PC70‑8 and PC78US‑6, so workshops running a mixed compact Komatsu fleet can source from one range. Send the serial number and we supply the block for your specific machine.
2. Precision metering returns to the operator
Compact work is all about feathering. Lapped spools restore the smooth, controllable response that lets an operator hold a grade or position the bucket in a tight trench without the jumpy feel of a worn valve.
3. The boom holds position while the machine is parked
Drift under a held bucket is oil escaping past worn spool lands. Fresh spool‑and‑bore pairs restore the seal, so the bucket stays where the lever left it through an idle.
4. Swing stops disturbing the work edge
Scored bores make the house jerky — overshoot, then a hunt back. New internals restore clean rotation, so the swing does not knock the bucket against the trench wall.
5. A complete block for a fast compact turnaround
Re‑spooling a worn compact valve on the bench is fiddly work. Swapping in this tested assembly is one clean exchange with the same hose positions — a day's job on a machine that earns by the hour.
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 723‑27‑50900 or 700‑23‑46001 and send the machine serial number. The references span the three compact models, so we confirm the correct block before dispatch.
Q2: Does this valve fit all three models?
A: The platform is shared, but port fittings and relief tuning differ per model. Send the serial number and we supply the block matched to your specific machine.
Q3: What symptoms indicate a worn distribution valve?
A: Boom drift, bucket settle at idle, jerky or overshooting swing, and tracks that surge when attachments are cycled. A leak test will confirm before you buy.
Q4: Can my existing valve be repaired?
A: Often yes — if the block casting is sound, a re‑spool and seal kit can restore it. Send photos and we will advise honestly on repair versus replacement.
Q5: What else should be changed at the same time?
A: The hydraulic oil and filters. Flush the circuit, change the return filter and suction strainer, so the new spools run in clean oil from day one.
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.