4WEH16 electro-hydraulic reversing valve disassembly and assembly steps

The disassembly and assembly steps of the 4WEH16 electro-hydraulic directional valve are as follows:

1. Disassembly steps

Preparation

Ensure that the equipment is shut down, release system pressure, and prevent hydraulic oil from splashing.

Prepare tools: Allen wrench, screw driver, kerosene or diesel, clean container, copper rod (steel/iron rod is prohibited), recording tools (such as notebook, camera).

Disassemble the electromagnet part

Remove the solenoid coil: Use an Allen wrench to loosen the locking nuts at both ends of the solenoid coil and gently remove the coil.

Take out the spring and push rod: Use a screwdriver to gently pry the joint surface, take out the spring, push rod and other small parts, and note their position and direction.

Separate the pilot solenoid valve: loosen the four screws fixing the pilot solenoid valve and remove it from the hydraulic directional valve to become two parts.

Disassemble the main valve part

Take out the main valve core: Remove the main valve core from the valve body, pay attention to the assembly direction of the valve core (cannot be installed upside down, it is directional).

Disassemble other parts: take out the positioning sleeve, seals (such as O-rings), springs, etc. in sequence, and place them in categories.

Observation and recording: Carefully observe the structural characteristics of each component, record the number of shoulders and undercut grooves, and determine the median functional form.

Clean parts

Clean all disassembled parts with kerosene or diesel, dry them and put them into a clean container.

It is prohibited to use cotton yarn to wipe parts to prevent fiber residue from affecting the sealing.

2. Assembly steps

Inspection before assembly

Check whether the cleaned parts are intact and replace damaged or worn seals (such as O-rings).

Ensure that the surfaces of all parts are free of impurities and burrs.

Assembling the main valve part

Install the main valve core: Gently push the main valve core into the valve body, and use your fingers to hold both ends of the valve core to ensure that it slides freely.

Install the positioning sleeve and spring: According to the records during disassembly, install the positioning sleeve and return spring correctly to ensure that the spring cavity is connected to the fuel tank through the pilot solenoid valve.

Install seals: Install new O-rings and other seals on the valve body to ensure reliable sealing.

Assembling pilot solenoid valve

Fix the pilot solenoid valve: Align the pilot solenoid valve with the mounting surface of the hydraulic directional valve and tighten the four fixing screws with a wrench.

Connect the control oil channel: Make sure the control oil inlet channel (such as pipe 7) is correctly connected to the pilot solenoid valve.

Install the electromagnet part

Put on the solenoid coil: Put the cleaned solenoid coil on the pilot solenoid valve.

Locking nuts: Use an Allen wrench to lock the nuts at both ends of the solenoid coil to ensure a secure connection.

Final inspection and debugging

Check the assembly quality: Ensure that all parts are installed in place and there are no missing or incorrect installations.

Manual operation test: In the absence of hydraulic oil, manually operate the solenoid valve to check whether the valve core moves flexibly.

Connect the hydraulic system: Connect the electro-hydraulic reversing valve to the hydraulic system, conduct an oil passage test, and check for leaks.

Function debugging: power on to test the reversing function of the solenoid valve to ensure accurate action and no impact.

3. Precautions

Disassembly and assembly sequence: Strictly follow the order of first outside then inside, first loosen then tighten, avoid using violent disassembly.

Directionality of parts: Parts such as the main valve core have directionality and cannot be installed upside down during assembly.

Seal replacement: New seals must be replaced during assembly to ensure reliable sealing.

Cleanliness control: Keep parts clean during the entire disassembly and assembly process to prevent impurities from entering the hydraulic system.

Safe operation: During disassembly and assembly, pay attention to prevent hydraulic oil from splashing and avoid burns or slipping.