Разпределител 723-18-13603 за мини багер Komatsu PC40MR PC40MR-2

PC40MR PC40MR‑2 Control Valve Assy for Excavator spare parts 723‑18‑13603 723‑18‑13602 723‑18‑13601 Hydraulic Main Valve OEM

Product Overview

On Komatsu part numbers, the final digits usually record a revision rather than a different machine — 723‑18‑13601, ‑13602 and ‑13603 represent the same valve family across successive updates. That matters practically: an owner with an early PC40MR may have a block built to the first revision, while a later machine carries the third. Ordering without checking the suffix is how a correct‑looking assembly arrives with a small but decisive difference in trim.

The PCs themselves — PC40MR and PC40MR‑2, the 4‑ton minimum‑radius machines — are small enough that hydraulic losses are felt immediately. The boom sags on a held bucket, the arm skips at stroke start, swing lands short, and the machine bogs when digging in clay. Those behaviours come from spools and bores worn enough to let oil cross between circuits inside the block. This OEM‑grade assembly replaces the whole valve with fresh internals matched to the correct revision, so the worn unit comes off and the replacement fits the original port positions.

Core Advantages

1. Revision suffixes resolved before shipping
We match the final digits against your existing tag so the assembly arrives at the correct revision, not the nearest one in the catalogue.

2. Tight‑footprint work regains its precision
MR machines rotate within their own width. Restored metering gives back the control that keeps trench walls clean and footings square.

3. Bucket stays where it was placed
Drift on a held load forces constant lever pressure. Fresh spool pairs keep the bucket steady while the operator checks the grade.

4. Travel stays even on soft ground
Restored circuit isolation stops track speed from reacting to what the bucket is doing, which matters on wet sites.

5. OEM‑grade build at practical cost
Dealer pricing is disproportionate on a 4‑ton machine. Equivalent clearances and tested settings at a fraction, with tiered pricing for yards running several minis.

Manufacturing & Quality Control

Spool and bore pairs are machined to print tolerance, matched by size, and hand‑run‑in until full‑stroke movement is smooth without binding. Assembled blocks are flow‑tested circuit by circuit with relief values logged against the matching revision; 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: Which of the three references do I need?
A: Send the tag on your existing valve and the machine serial plate. The final digits record the revision and we match against them before dispatch.

Q2: Can I fit the later revision in an earlier machine?
A: Sometimes, when the update is a supersession, but not always — porting can change. Send photos of the mounting face and port layout and we will confirm fitment.

Q3: What symptoms indicate valve wear?
A: Boom drift on held loads, slack at stroke start, inconsistent swing placement, and a machine that bogs when digging. 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. For a compact machine, a complete tested assembly avoids repeat visits. 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. Compact circuits are sensitive to debris.

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.