Why Solenoid Valves Are Central to Your Excavator's Hydraulic Performance
Your excavator's hydraulic system does not move fluid based on mechanical input alone. Every controlled hydraulic function is directed by solenoid valves receiving electrical commands from the machine's control unit and responding by routing pressurised fluid to the correct actuator at the correct flow rate and pressure. Without precise solenoid valve operation, your hydraulic system cannot execute the controlled movements your machine is built to perform.
Here is what happens when solenoid valves fail on excavators and hydraulic equipment:
- Individual hydraulic functions become unresponsive, with boom, arm, bucket, or travel circuits failing to respond to operator inputs when the solenoid valve controlling that circuit is no longer opening and closing correctly
- Hydraulic drift develops in circuits where a failing solenoid valve is no longer holding the valve seat position that prevents unintended fluid movement under load
- Intermittent hydraulic function occurs when a solenoid coil is developing a fault and energising inconsistently, producing an unpredictable hydraulic response that is difficult to diagnose without specific fault code data
- Full circuit loss occurs when the valve coil fails, and the valve body defaults to its closed or open position, removing the hydraulic function from that circuit entirely
- Control system fault codes are generated when the machine's ECU detects an open circuit, short circuit, or abnormal resistance reading from a solenoid coil that is failing or has already failed
Each of these conditions points to the same resolution: replacing the faulty solenoid valve or solenoid coil with a quality-matched, OEM-specified part that restores correct hydraulic control to the affected circuit.
Our Solenoid Valve Range at Imara Engineering
Imara Engineering stocks solenoid valves and solenoid coils across every valve type, voltage specification, and brand platform that excavators and hydraulic systems in service today require. Our range is organised by valve type and brand platform, so you can confirm fitment and source the correct part without delay.
Hydraulic Solenoid Valves: 12V and 24V
Voltage specification is one of the most critical selection criteria when sourcing a hydraulic solenoid valve replacement. Using an incorrect voltage coil on a solenoid valve causes immediate coil failure: an under-voltage coil does not generate sufficient magnetic force to move the valve plunger, while an over-voltage coil overheats and burns out rapidly.
Our hydraulic solenoid valve 12V range covers the standard 12-volt electrical system applications found across a wide range of excavators, compact construction equipment, and auxiliary hydraulic systems. Our hydraulic solenoid valve 24V and 24V hydraulic solenoid valve range covers the heavy-duty 24-volt electrical systems used across the majority of full-size excavators, mining equipment, and industrial hydraulic machinery. Every valve in both voltage ranges is cross-referenced to OEM specifications for confirmed fitment before listing.
Proportional Solenoid Valves
The proportional solenoid valve provides variable flow control rather than simple on-off switching, allowing the machine's control system to modulate hydraulic flow rate and pressure proportionally to the electrical input signal it delivers to the valve coil. Proportional solenoid valves are used in applications where precise, graduated hydraulic control is required, including pilot pressure control, implement speed management, and advanced machine control functions on modern excavators.
A failed proportional solenoid valve produces loss of fine hydraulic control in the affected circuit, causing the machine to operate with coarse, unmodulated hydraulic response rather than the smooth, graduated movement the operator and control system expect. Our proportional solenoid valve range covers the major excavator and hydraulic system platforms in service today, with each part verified against OEM specifications before listing.
Directional Solenoid Valves
The directional solenoid valve controls the direction of hydraulic flow within a circuit, routing pressurised fluid to the correct port in response to an electrical command from the machine's control system. Directional solenoid valves are the most common valve type across excavator hydraulic systems, governing boom, arm, bucket, and travel circuit direction in response to operator joystick and control inputs.
Our directional solenoid valve range includes the double-acting hydraulic solenoid valve for circuits requiring bidirectional flow control, and the bi-directional solenoid valve for applications where flow must be managed in both directions from a single valve body. We also stock the NG6 solenoid valve, the industry-standard D03 or NG6 cetop mounting pattern valve used extensively across hydraulic manifold assemblies and mobile equipment hydraulic systems.
Hydraulic Solenoid Coils
In many solenoid valve failures, the valve body itself remains serviceable, and only the hydraulic solenoid coil requires replacement. The coil is the electromagnetic component that generates the magnetic field required to actuate the valve plunger, and it is the coil that most commonly fails due to voltage irregularities, heat exposure, moisture ingress, and normal service life fatigue.
Replacing the coil alone, rather than the complete valve assembly, is a cost-effective resolution when the valve body and plunger are confirmed to be in serviceable condition. Our hydraulic solenoid coil range covers the coil replacements for the major valve platforms in our catalogue, and our Rexroth solenoid coil range covers coil replacements for Bosch Rexroth valve bodies specifically.
Hydraulic Solenoid Valve Manifolds
The hydraulic solenoid valve manifold is a multi-valve assembly that integrates multiple solenoid valve functions into a single manifold block, reducing the number of individual plumbing connections in the hydraulic circuit and centralising valve control in a single serviceable assembly. Manifold-mounted solenoid valves are common on modern excavators where multiple hydraulic functions are managed through a single valve block connected to the machine's control system.
Our hydraulic solenoid valve manifold range covers the major manifold configurations used across excavator and construction equipment hydraulic systems, with each assembly cross-referenced to OEM part numbers for confirmed fitment before listing.
CAT and Caterpillar Solenoid Valves
Our cat solenoid valve and caterpillar solenoid valve range covers the hydraulic solenoid valve applications across the CAT excavator, dozer, grader, and off-highway equipment platforms. CAT hydraulic systems use solenoid valves extensively across implement control, pilot pressure management, and transmission control circuits, and our range is cross-referenced against CAT OEM part numbers for confirmed fitment across the major machine and engine families.
Komatsu Solenoid Valves
Our Komatsu solenoid valve range covers hydraulic solenoid valve applications across the Komatsu PC-series excavator and WA-series wheel loader platforms, with each part cross-referenced against Komatsu OEM part numbers for confirmed fitment before listing.
Hitachi Solenoid Valves
Our Hitachi solenoid valve range covers hydraulic solenoid valve applications across the Hitachi ZX and EX series excavator platforms, with each part verified against Hitachi OEM specifications for confirmed fitment before listing.
Kobelco Solenoid Valves
Our Kobelco solenoid valve range covers hydraulic solenoid valve applications across the Kobelco SK-series excavator platforms, with each part cross-referenced against Kobelco OEM part numbers for confirmed fitment before listing.
Bosch Rexroth Solenoid Valves
Bosch Rexroth hydraulic components are used extensively across industrial and mobile hydraulic systems worldwide, and our bosch rexroth solenoid valve range covers the valve and coil replacements most commonly required across Rexroth hydraulic systems in service on excavators and construction equipment. Our Rexroth solenoid valve range includes the Rexroth 4we6 hydraulic solenoid valve, one of the most widely used directional control valves in mobile and industrial hydraulic applications globally, with each part cross-referenced to Rexroth specifications before listing.
Danfoss and Northman Solenoid Valves
Our Danfoss hydraulic solenoid valve range covers the solenoid valve applications for Danfoss hydraulic systems used across excavators and mobile equipment, with each part verified against Danfoss specifications for confirmed fitment. Our Northman solenoid valve range covers Northman hydraulic solenoid valve applications for the construction equipment platforms where Northman components are specified, with each part cross-referenced before listing.
Selecting the Correct Solenoid Valve for Your Hydraulic System
Sourcing the correct solenoid valve replacement requires confirmation of several key specifications before the order is placed. An incorrect valve type, voltage rating, or flow specification will not restore correct hydraulic function and, in some cases, will cause further damage to the hydraulic circuit. Here is what you need to confirm before sourcing:
- Your machine make, model, and serial number prefix, or your hydraulic system brand and model if sourcing for an industrial hydraulic application.
- The valve type required: proportional, directional, double-acting, or manifold-mounted.
- The voltage specification: hydraulic solenoid valve 12V or hydraulic solenoid valve 24V.
- The OEM part number from the existing valve or your machine's hydraulic schematic.
- Whether a complete valve assembly or a solenoid coil replacement alone is required, based on your diagnosis of the failed component.
If you have the OEM part number, search our catalogue directly for the fastest match. If you are unsure of the correct specification, contact the Imara Engineering parts team, and we will identify the correct solenoid valve excavator replacement for your machine and hydraulic system before the order is placed.
