SK135 Main Control Valve for Kobelco SK135 13‑ton Medium Excavator spare parts

Short Description:

The Kobelco SK135 main control valve is an original negative‑flow multi‑way control valve matched for Kobelco SK135 13‑ton medium excavator. As the core hydraulic distribution hub of the whole machine, it is precisely calibrated for the negative‑flow hydraulic system of SK135, perfectly matching the power output characteristics of the main hydraulic pump and engine. It distributes hydraulic flow for boom, arm, bucket, traveling and slewing actuators, realizing oil circuit reversing, stepless flow adjustment and multi‑action compound coordination. Optimized for municipal construction, foundation excavation, earthwork backfilling and material loading scenarios, this valve delivers stable flow output, sensitive operation response and reliable negative‑flow signal feedback, suitable for long‑term continuous medium‑load construction operations.

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Product Detail

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description

Genuine Kobelco SK135 multi‑way valve adopts integral modular valve block structure for medium‑tonnage excavators, equipped with high‑precision hardened spool‑sleeve pairs, built‑in negative‑flow feedback valve assembly, independent pressure compensation unit, main overflow valve and multi‑stage overload buffer valve. Under hydraulic pilot control, it receives negative‑flow feedback signals from the main pump to realize adaptive flow distribution. Core spool‑sleeve components go through ultra‑precision grinding and surface quenching hardening treatment, effectively reducing internal leakage and friction loss under cyclic load impact. High‑rigidity cast valve block resists site vibration and pressure shock. Each finished valve passes factory full‑pressure impulse test, full‑range flow calibration and long‑cycle durability test. It effectively improves common faults of medium excavators such as jittery compound actions, weak digging performance, slow response and excessive system temperature rise.

product parameters

Brand: KOBELCO Genuine Original

Model: SK135

Product Name: Negative‑Flow Multi‑way Main Control Valve Assembly

Applicable Equipment: Kobelco SK135 13‑ton Medium Excavator

Structural Type: Integral modular multi‑spool valve, negative‑flow control system, hydraulic pilot control

Core Structure: High‑rigidity cast valve block, hardened spool‑sleeve assembly, negative‑flow feedback valve group, independent pressure compensation unit, main relief valve, overload buffer valve, high‑pressure aging‑resistant sealing assembly

Main Material: High‑strength alloy cast valve body, carburized hardened alloy spool, high‑precision valve sleeve, composite high‑pressure sealing parts

Core Function: Whole‑machine hydraulic flow distribution, oil circuit direction switching, negative‑flow adaptive compensation, multi‑actuator compound action coordination, system overload pressure‑limiting protection

Working Characteristics: Sensitive negative‑flow feedback, stable flow output, smooth compound linkage, good anti‑pollution performance, convenient on‑site adjustment

Working Condition Adaptation: Municipal engineering, foundation excavation, earthwork backfilling, material loading, long‑duration medium‑load cyclic operation

Matching Parts: SK135 negative‑flow hydraulic main pump, hydraulic cylinder group, travel & swing motor, PPC pilot valve, high‑pressure hydraulic pipeline and filter elements

advantages

Specially calibrated for SK135 negative‑flow hydraulic system, perfectly matching original main pump and engine power, delivering stable hydraulic output in municipal and earth‑moving working conditions.
Reliable negative‑flow signal feedback cooperates with pressure compensation mechanism to realize adaptive flow distribution, ensuring smooth multi‑mechanism compound operation without obvious speed difference or jitter.
Hardened precision spool‑sleeve pairs suppress internal leakage, maintaining stable control accuracy after long‑time medium‑load continuous operation on construction sites.
Multi‑stage overload buffer structure absorbs instantaneous pressure impact, protecting hydraulic cylinders and swing & travel motors and extending service life of hydraulic components.
High‑rigidity integral cast valve block resists construction vibration and oil pollution, adapting to complex municipal and earth‑work job‑site environments.
Modular valve group design supports single‑spool maintenance and replacement, reducing spare‑parts cost and equipment downtime for 13‑ton medium excavators.
Original standard mounting dimensions support 1:1 direct replacement without modification, lowering overhaul difficulty and improving maintenance efficiency.

maintenance & replacement tips

Inspect valve‑block fixing bolts, pilot oil ports and sealing end faces regularly to eliminate oil‑leak risks caused by long‑term site vibration and mechanical impact.
Replace hydraulic oil and filter elements strictly following Kobelco official maintenance cycles, to prevent hard impurity particles from scratching precision spool‑sleeve pairs and degrading valve‑group performance.
Use qualified high‑cleanliness hydraulic oil, to avoid spool sticking, flow disorder and negative‑flow signal failure caused by oil contamination and deterioration.
Periodically test main‑system working pressure, relief‑valve setting pressure and negative‑flow feedback sensitivity, ensuring the valve group operates within SK135 rated pressure range.
Avoid long‑term full‑load overpressure operation and frequent violent impact, to reduce fatigue wear of internal precision hydraulic components.
Timely install genuine SK135 main control valve when faults such as weak digging force, unsmooth compound actions, obvious internal leakage and persistent system high‑temperature occur, to restore full‑machine hydraulic control performance.

warehouse

We have built four spare parts warehouses in Xuzhou, Jining, Kunshan and Changsha to provide customers from all over the world with a variety of high-quality spare parts. We can basically ship self-provided spare parts within three days after confirming the order. If the spare parts need to be adjusted or processed, they will be shipped within 7-30 days.