Komatsu control valve assembly

Quick Answer An excavator's hydraulic system turns the engine's rotating power into force and motion using pressurised oil. The main pump pushes oil; the control valve directs it to the right function; cylinders create straight-line force (boom, arm, bucket) and motors create rotation (swing and travel). Oil then returns to the tank and through the filters. Understanding this loop explains why the...

Quick Answer To match the right hydraulic pump to your Komatsu or Hitachi excavator, you need five things: the machine model and serial number, the pump displacement, the control type (load-sensing / negative control), the mounting and spline, and the port layout. The fastest way to get all five is to read the two plates — the machine plate (model + serial) and the pump nameplate — and...

Quick Answer The control valve assembly is the "brain" of an excavator: it directs the pump's oil to every function. You must replace it when the body or bore is damaged, when a spool sticks or leaks internally beyond repair, when metal contamination has scored the valve, or when the valve has been rebuilt once already and failed again. You choose the right model by matching six points: machine mo...

Quick Answer The Kobelco SK200 / SK210 / SK220 / SK250 / SK260 excavators — the whole -8 generation plus the SK210-9 — share one family of main control valve assemblies, commonly ordered under two numbers: YN30V00101F5 and YN30V00126F1. They are the same family, but "same family" does not mean freely interchangeable: the suffix and build level decide which machine each number belongs t...

Quick Answer The Komatsu PC300-7 is a 30-tonne class machine, and its main pump is the HPV140 — a variable-displacement piston pump. "HPV140" identifies the pump model and size class, but like every hydraulic pump it is built in several variants, so two pumps can both say HPV140 and still not match your machine. To select the right one, work through four matching points: machine model and se...

Quick Answer 1. What is it? The PC300-8 control valve assembly — also called the main control valve or distribution valve — is the large, multi-section block that routes the main pump's oil to every function, sets priorities, limits system pressure and feeds the pump's control signal. On this machine it is a heavy casting: about 300 kg, packed 65 × 45 × 75 cm.2. What does i...

Quick Answer 456-0167 is a Caterpillar joystick base assembly — officially listed as "Base Assembly-Joystick". It is the lower body of the joystick: the part that carries the pivot, the sensors and the 6-pin DT electrical connector, turning the operator's hand movement into control signals for the machine.It is fitted across Caterpillar's D-series compact track loaders and skid steer loaders...

Quick Answer Reviving an older Komatsu like the PC128UU-1 is usually the right economic decision — the machine is paid for, and it still does the work. The hard part is not the machine; it is finding the right pump without being sold the wrong one.On old machines, three things make selection harder than on a new one: part numbers get superseded, listings cross-reference numbers loosely, and ...