- Preparation
- Park the machine on level ground with all hydraulic cylinders in the closed position to prevent movement or accidental extension during maintenance.
- ⏹ Stop the engine and 🔐 remove the starter key.
- Release Hydraulic Tank Pressure
- 💢 Press the breather (Ⓑ point) on the top of the hydraulic tank to release the pressure.
- Drain Hydraulic Oil
- Drain the hydraulic oil from the hydraulic tank.
- Remove and clean the suction strainer from the hydraulic tank.
- Note: ⚡️ The hydraulic oil temperature will be high soon after stopping the engine. Wait until it cools to below 40°C before starting maintenance.
- Hydraulic System Draining
- Drain hydraulic oil from:
- Both sides of the travel motor hoses.
- Swing motor hoses.
- Hydraulic pump delivery hoses and suction hose.
- Hydraulic cooler and associated hoses.
- Breaker circuit hoses, including the breaker filter housing.
- Hydraulic cylinders (boom, bucket, and arm cylinders).
- ⛓ Metal tubes of all functions.
- Control valve block hoses for all functions.
- Drain hydraulic oil from:
Restoration After Flushing
a.♻️ Ensure all hoses and components are clean before reassembly. Inspect hoses for visible debris or residue, and wipe components with lint-free cloths to ensure they are free from contaminants.
b. Replace all hydraulic filters, including breaker filters.
c. 🔒 Tighten the hydraulic tank drain plug securely.
d. Refill the hydraulic tank with the specified oil to the recommended level.
e. Loosen the air bleed (C) plug. If hydraulic oil does not flow from the plug, fill the hydraulic pump case with oil through the bleed plug. Retighten the bleed plug.
f. Run the machine at idle (low RPM) for 5-10 minutes.
- Air Bleeding Procedure for Hydraulic Rams
- Idle the engine at low speed. Air bleeding is necessary to remove trapped air from the hydraulic system, ensuring smooth and consistent operation of the hydraulic rams.
- ➕ Extend and ➖ retract each ram 4-5 times, stopping ➡ 100 mm before the end of each stroke.
Key Specifications
- Model: JS205 JCB , 20 ton ranger Excavator
- Hydraulic Tank Capacity: ⛽ 120 liters
- Hydraulic System Capacity: ⛽ 220 liters
- Pressure Ratings:
- Boom/🚜/Arm/Bucket: ⚙️ 343 bar
- Swing Circuit: ⚙️ 289 bar
- Travel Circuit: ⚙️ 353 bar
- Pilot Circuit: ⚙️ 40 bar
- Power Boost: ⚡️ 373 bar
Points to Remember During Restoration
- ♻️ Confirm that all drained components are clean and free of debris.
- Replace all necessary filters to prevent contamination.
- ⛽ Verify that the hydraulic oil level is at the recommended level before starting the machine.
- 🔒 Check all hose connections for tightness and leaks.
- ⏰ Perform a test run at low RPM to ensure proper system function.
Additional Notes
- ⚡️ Always use the manufacturer-recommended hydraulic oil. Using the correct oil ensures optimal system performance, reduces wear and tear on components, and extends the overall lifespan of the hydraulic system.
- Ensure all safety precautions are followed during the procedure.
- 📖 Consult the operator’s manual for any machine-specific instructions.
Frequently ask questions
How to flush an excavator hydraulic system?
When should you flush the hydraulic system?
How to flush water out of a hydraulic system?
How to flush hydraulic hoses?
https://equipmentguider.com/how-to-maintain-your-equipment-a-complete-guide/
Follow us on Facebook page.
