The 860517018 Spring is a genuine XCMG compression (return) spring used in motor grader brake calipers, hydraulic valve assemblies, parking brake mechanisms, and control linkages. This precision‑wound spring provides the necessary force to return components to their neutral or engaged position after actuation on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. Manufactured from high‑grade spring steel with a corrosion‑resistant zinc‑phosphate coating, the 860517018 spring withstands millions of compression cycles, vibration, and exposure to oil, grease, and moisture. A weakened, broken, or missing spring can cause brake drag, valve malfunction, or incomplete component return, leading to safety hazards and equipment damage. Replacing a failed spring with the genuine XCMG 860517018 restores proper force, travel, and system function.
The 860517018 spring is designed with specific wire diameter, outer diameter, free length, and spring rate (k‑value) to match XCMG’s original engineering specifications. It is commonly used in the parking brake linkage to hold the brake disengaged when released, or as a poppet return spring in hydraulic control valves. Using genuine XCMG guarantees correct material, heat treatment, and load characteristics for long‑term reliability.
A sagging or cracked spring leads to inconsistent machine response. Always replace suspect springs with genuine XCMG 860517018 to ensure safety and performance.
| Parameter | Specification |
|---|---|
| OEM Number | 860517018 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Compression Spring (Helical, Round Wire) |
| Material | Spring steel (DIN 17223 / Oil tempered chrome‑silicon) |
| Wire Diameter | 3.0 mm (±0.03 mm) |
| Outer Diameter | 18.0 mm (±0.3 mm) |
| Free Length (uncompressed) | 65 mm (±0.8 mm) |
| Number of Active Coils | 8.5 |
| Total Coils | 10.5 (closed & ground ends) |
| Spring Rate (k) | 12.5 N/mm ±5% (71.4 lbs/in) |
| Solid Length (fully compressed) | 32 mm (approx.) |
| Maximum Recommended Compression | 30 mm (from free length) |
| Force at 30 mm Compression | 375 N ±5% (84.3 lbf) |
| Surface Finish | Zinc‑phosphate + oil dip (240h salt spray) |
| Operating Temperature Range | -40°C to +150°C (-40°F to +302°F) |
| Standards | DIN 2095, ISO 10243, XCMG Q/XCMG 182-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 860516988, 860517005, 860517028 |
The XCMG 860517018 Spring is essential for the correct return and positioning of brake calipers, control valves, and linkage mechanisms on motor graders.
In the parking brake system, this spring releases the brake when the operator disengages the lever. A broken spring can leave the brake partially applied, causing drag, overheating, and accelerated lining wear.
Inside hydraulic control valves, the 860517018 acts as a poppet return spring, ensuring the valve spool returns to center after actuation. A weak spring causes slow or incomplete spool return, leading to delayed implement response.
On throttle linkages and transmission shift cables, this spring provides the necessary force for pedal or lever return. A sagging spring can cause a stuck throttle or erratic shifting.
The spring’s rate and free length are matched to the system’s requirements; a generic spring with different characteristics will not provide proper force or travel.
Replacing a worn or broken spring with genuine XCMG 860517018 restores correct force, travel, and safety margins.
Each 860517018 spring is cold‑wound from oil‑tempered chrome‑silicon steel wire (DIN 17223) on CNC spring coiling machines.
After winding, the spring is stress‑relieved in a furnace to remove residual stresses from the coiling process.
The ends are ground flat to ensure proper seating against flat surfaces. Grinding is performed to within 0.5 mm of wire diameter tolerance.
Each spring is then shot‑peened to induce compressive residual stresses, dramatically improving fatigue life under cyclic loading.
XCMG’s quality control includes 100% load testing at defined compression heights, with automatic rejection of springs outside the ±5% tolerance.
Sample springs are also cycle‑tested to 1,000,000 compressions at full travel to verify no permanent set.
Genuine springs are stamped with an identification code; counterfeit springs often lack heat treatment and fail after a few thousand cycles.
Only genuine XCMG guarantees the correct spring rate, free length, and fatigue life for grader applications.
Before removing a spring, note its orientation and which components it contacts. Relieve any system pressure if the spring is inside a hydraulic valve.
Use spring compressors or pliers suitable for the spring diameter. Never stretch a compression spring beyond its solid length.
Inspect the spring seats and guide rods for wear or burrs. Clean the area thoroughly.
Install the new 860517018 spring by compressing it slowly and guiding it into place. Ensure it sits squarely in its seats.
Never cut or grind a spring to alter its length – this changes the spring rate and can cause sudden failure.
After installation, manually cycle the component (brake lever, valve spool) to verify smooth return and full travel.
XCMG recommends replacing springs every 5,000 hours or whenever the associated valve or linkage is disassembled.
Keep a few spare springs in your parts inventory – they are inexpensive insurance against sudden failure.
Aftermarket springs are often made from lower‑grade steel that sags or takes a permanent set after a few months of use.
Many generic springs have incorrect wire diameter or coil count, resulting in spring rates that are too high (causing hard operation) or too low (causing incomplete return).
Counterfeit springs may lack shot‑peening and stress relief, leading to premature fatigue failure.
The genuine XCMG 860517018 is heat‑treated and shot‑peened for maximum fatigue life, validated by millions of test cycles.
Genuine springs also feature the exact free length and solid height for proper fitment in tight cavities.
Using genuine XCMG protects your equipment warranty and ensures the spring will perform as designed.
For fleet operators, genuine springs reduce safety risks (brake drag) and downtime from valve or linkage malfunctions.
Insist on XCMG genuine 860517018 for reliable spring force and long service life.
Indicators that the 860517018 spring needs replacement include: visible corrosion or pitting, a cracked or broken coil, a reduction in free length compared to specification, and sluggish component return.
If a brake lever does not fully return to the released position, the spring has likely weakened.
During routine inspections (every 1,000 hours), check springs for signs of sagging or rust. Replace any spring that shows pitting – it will act as a stress concentrator.
Preventive replacement is recommended every 5,000 hours or whenever the related component is overhauled.
The cost of a genuine 860517018 spring is minimal compared to the cost of a brake caliper seized by an unbalanced spring or a hydraulic valve that fails to return.
Keep spare springs in your service truck – they are often needed in the field after a linkage repair.
When replacing, clean the spring seats and apply a light coat of corrosion inhibitor if the environment is wet.
A properly tensioned spring ensures crisp, reliable component actuation.
The 860517018 Spring is stocked in XCMG’s regional warehouses: North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai).
Standard air freight delivers within 2‑5 business days worldwide; express courier (DHL/FedEx) is available for 1‑2 day emergency shipments.
Bulk orders (100+ springs) can be shipped via sea freight with volume discounts. Each spring is individually sealed in a plastic bag to protect the finish.
For large fleets, XCMG offers consignment stock programs – springs are stored on‑site and billed as used, eliminating order lead times.
Don’t let a broken or weak spring compromise your grader’s braking or control precision. The genuine XCMG 860517018 delivers consistent force, exact dimensions, and long fatigue life.
Order today and keep your motor grader’s mechanical and hydraulic systems responding reliably.
Upgrade your motor grader’s return action with the XCMG 860517018 Spring – engineered for precise rate, full travel, and extreme durability.
Choose genuine XCMG for the confidence that every spring will provide the right force for thousands of operating cycles.
Order the 860517018 now and experience the quality that keeps XCMG graders responsive and safe.
