عجلة مشط التبن لـ حفارة متوسطة الحجم Kobelco SK130 SK135 SK140-8

SK130 SK135 SK140‑8 Control Valve Assy for Kobelco Excavator spare parts Hydraulic Main Valve OEM

Product Overview

There is a cost to a worn hydraulic block that never appears on a parts invoice: heat. On the SK130, SK135 and SK140‑8, the hydraulic main valve divides pump flow between boom, arm, bucket, swing and travel, and when its spools no longer seal properly, oil slips past them instead of doing work. That slip turns engine power into warmth in the tank — the oil runs hotter, the machine feels weaker for the same throttle, and the operator ends up working the levers harder to compensate.

The behavioural signs arrive alongside the heat. The boom sinks while holding a loaded bucket. The arm takes up slack at stroke start. Swing placement lands short and hunts. Tracks slow when the bucket is worked. On a 13‑to‑14 ton machine doing roadwork or quarry support, that combination eats into the day quietly. This OEM‑grade assembly replaces the block complete with fresh internals set to Kobelco values, so the worn unit comes off and the replacement goes into the original hose positions.

Core Advantages

1. Ends the power that was going into heat
Leakage across worn spools converts engine output into oil temperature. Restored clearances put that power back into the cylinders, so the machine does the same work at the same throttle without running hot.

2. Three models, one confirmed fit
The SK130, SK135 and SK140‑8 sit in the same working band but differ in trim. Send the serial and tag photo and we supply the block matched to your specific machine.

3. Boom holds while grade is checked
Drift on a held bucket forces the operator to keep pressure on the lever. New spool pairs keep the load where it was placed.

4. Swing placement stops needing correction
Restored circuit isolation puts the house where the operator stopped it, ending the overshoot‑and‑correct habit that costs seconds on every placement.

5. OEM build quality at aftermarket economics
Dealer assemblies on this class of machine carry pricing that is hard to justify. Equivalent clearances and tested pressure settings at a fraction, with tiered pricing for workshops.

Manufacturing & Quality Control

Spool and bore pairs are machined to drawing tolerance, matched by size, and hand‑run‑in until movement is smooth across the full stroke. Assembled blocks are flow‑tested circuit by circuit on the bench, with relief and compensator values recorded against model figures; units outside window are stripped and corrected. Blocks ship internally fogged, ports capped, and packed in foam‑lined crates.

Frequently Asked Questions

Q1: Does one assembly cover all three models?
A: The models share a platform but differ in pressure trim and some port fittings. Give us the model and serial number and we configure the block for your machine before dispatch.

Q2: Why is the hydraulic oil running hotter than it used to?
A: Internal leakage converts pump output into heat instead of work. Before replacing coolers or pumps, check the valve with a circuit leak test — worn spools are a common cause.

Q3: Can the existing block be re‑spooled?
A: If the casting is sound and has not been rebuilt, a kit may work. Where wear spans several circuits, a complete assembly is usually the better long‑term cost. Photos help us advise.

Q4: How much downtime should be planned?
A: Most of a working day for removal and refit with the cover open, plus bleeding and pressure verification. Schedule it as a planned stop.

Q5: What hydraulic servicing goes with the swap?
A: Flush the system, renew the return filter, clean the suction strainer, and refill with specified oil. Old 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 packaging before opening if it arrives damaged.