عجلة مشط التبن 723-48-26202 لـ حفارة Komatsu PC300HE-7E0

PC300HE‑7E0 Control Valve Assy for Komatsu Excavator spare parts 723‑48‑26202 Distributor Aftermarket

Product Overview

Komatsu part numbers for the PC300 family sit close together — 723‑47‑26103 for one configuration, 723‑48‑26202 for another — and at a parts counter that difference is easy to miss. Order the familiar number, receive a block that does not port or trim correctly, and the machine waits another month for freight. On the PC300HE‑7E0, the 48‑series reference in this listing is the one that matches, and the block is configured for boom, arm, bucket, swing and travel flow division on the 30‑ton platform.

Wear inside a block this size is felt as lost output rather than as a fault. The boom sags on a held bucket so loads get re‑spotted. The arm loses authority at the bottom of a pass. Swing lands short of the operator's stop. Tracks bog on the ramp when the bucket is full. Those behaviours come from spools and bores worn enough to let oil cross between circuits. This aftermarket distributor replaces the assembly complete with fresh internals set to the correct values, so the worn unit comes off in one piece and the replacement fits the original hose positions.

Core Advantages

1. The 48‑series block, not the near‑look‑alike
Similar numbers do not mean the same block. We confirm against your tag and serial so the assembly that arrives ports and trims correctly the first time.

2. Authority returns at the cutting edge
Leakage drains pressure before it reaches the cylinder. Renewed clearances put force back into the arm and bucket where production is decided.

3. Full buckets stay over the body
A sagging boom forces a re‑spot on every cycle. Restored retention keeps the load where the operator set it.

4. Swing placement stops needing a second input
Restored circuit isolation ends the overshoot‑and‑correct habit that repeats hundreds of times per shift.

5. Complete assembly rather than an open‑ended repair
One tested block resolves every drifted circuit, instead of returning to the machine for one failure after another.

Manufacturing & Quality Control

Spool and bore pairs are machined to print, 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 the matching configuration; out‑of‑window units are stripped and corrected. Blocks ship internally oil‑fogged, ports capped, and crated on foam.

Frequently Asked Questions

Q1: Is this the same block as the 723‑47‑26103 listing?
A: No. The two references serve different configurations within the PC300 family. Send a photo of the existing valve tag with the serial number and we confirm which one your machine carries.

Q2: What happens if I install the wrong configuration?
A: Porting or relief mismatch shows up immediately as sluggish or unstable functions, and forcing it can damage seals. Correct reference matching avoids the freight cycle entirely.

Q3: What symptoms indicate valve wear?
A: Boom drift on held loads, lost authority at the bottom of a cut, inconsistent swing placement, 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 service per dollar. 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 will damage 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.