The genuine XCMG 860512555 Upper Bronze Sleeve is a precision‑machined bushing designed for motor grader circle drive housings, steering knuckle upper pivots, and articulation joint bearings. This OEM 860512555 upper bronze sleeve provides low‑friction, high‑load support between moving shafts and stationary bores, absorbing radial and oscillating forces without seizing. Manufactured from centrifugally cast phosphor bronze (CuSn8P), the XCMG upper bronze sleeve offers excellent wear resistance, conformability, and embeddability for contaminants. The 860512555 sleeve is engineered for XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders.
The upper bronze sleeve is typically located in the circle drive top support and the front steering knuckle. A worn sleeve creates excessive play, misalignment, and accelerated pin wear. Replacing with genuine XCMG 860512555 restores original tolerances, eliminates knocking noises, and extends the service life of your grader’s critical pivot joints.
This component also appears in blade lift linkage and articulation joint upper mounts. XCMG 860512555 ensures consistent oil film retention through spiral lubrication grooves, reducing maintenance intervals and preventing premature component failure.
| Parameter | Specification |
|---|---|
| OEM Number | 860512555 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Upper Bronze Sleeve / Flanged or Straight Bronze Bushing |
| Material | Phosphor bronze (CuSn8P / SAE 660) centrifugally cast |
| Outer Diameter (OD) | 70.00 mm ±0.03 mm |
| Inner Diameter (ID – Finished) | 60.00 mm +0.05 / -0.00 mm |
| Overall Length | 65.0 mm ±0.2 mm |
| Flange Diameter (if present) | 82.0 mm ±0.2 mm |
| Flange Thickness | 5.0 mm ±0.1 mm |
| Wall Thickness | 5.0 mm |
| Lubrication Grooves | Spiral internal groove (2 start, 2 mm pitch) + cross‑hatch pattern |
| Hardness (Brinell) | 80‑110 HB |
| Tensile Strength | ≥ 240 MPa (35,000 psi) |
| Max Dynamic Load (PV) | 1.75 N/mm² · m/s |
| Operating Temperature Range | -40°C to +180°C (continuous) / +220°C peak |
| Coefficient of Friction (Lubricated) | 0.08 – 0.12 (with EP grease) |
| Surface Finish (ID) | Ra ≤ 0.8 µm (finish bored) |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 860512488, 860512500, 860512601 |
The 860512555 upper bronze sleeve supports the top end of the circle drive shaft or steering kingpin. It absorbs radial shocks and oscillating movements while allowing smooth rotation.
Without a properly lubricated bronze sleeve, metal‑to‑metal contact occurs, rapidly wearing the pin and housing bore. Replacing a worn sleeve with genuine XCMG 860512555 restores precise alignment and eliminates free play.
In grader circle drives, this sleeve prevents the blade from wobbling during angled grading. In steering knuckles, it maintains correct camber and prevents tire scuffing.
Each 860512555 sleeve is machined from centrifugally cast phosphor bronze, which has a dense, fine‑grained structure superior to sand‑cast alternatives. The material contains 8‑10% tin and 0.2% phosphorus for enhanced wear resistance.
The internal spiral oil grooves are precision cut to a depth of 0.5 mm and width of 2 mm. They promote even grease distribution along the entire pin length, preventing dry running at the ends.
The bore is finish‑bored to H7 tolerance and then roller‑burnished to work‑harden the surface, reducing initial wear. XCMG inspects each sleeve for porosity and dimensional accuracy using air gauges.
Remove the pin and clean the housing bore thoroughly. Use a sleeve puller or a press to extract the old sleeve. Do not damage the bore surface.
Lightly oil the outside of the new 860512555 sleeve. Press it into the housing using a mandrel that contacts only the sleeve’s end face. Ensure the oil groove aligns with the grease fitting hole.
After installation, check the inside diameter with a telescoping gauge. The pin should slide with slight hand pressure. Grease the assembly thoroughly before operation.
Excessive play in the circle drive (more than 5 mm measured at the blade tip), knocking noise when changing blade angle, steering wander, and uneven grease leakage.
Visible scoring or galling on the pin surface, bronze particles in the oil or grease, and a loose feeling in the articulation joint indicate the need for immediate replacement.
XCMG recommends greasing the upper bronze sleeve every 250 operating hours. Apply 10‑15 pumps of lithium EP grease. Replace the sleeve every 4,000‑6,000 hours for standard use.
In dusty or muddy conditions, shorten replacement to 2,500‑3,000 hours. Always replace both the pin and sleeve as a set to ensure correct clearance.
Using genuine XCMG 860512555 guarantees correct material hardness and groove geometry. Aftermarket sleeves often have rough bores, leading to rapid pin wear.
Genuine XCMG 860512555 sleeves come with a 12‑month warranty. Stocked in regional warehouses: Houston (USA), Rotterdam (EU), Dubai (UAE), and Shanghai (Asia).
Air freight delivery: 3‑7 business days worldwide. Emergency 24‑48 hour shipping available for urgent repairs. Bulk orders (25+ sleeves) receive volume discounts and sea freight options.
Aftermarket bronze sleeves often use low‑grade brass or aluminum bronze, which lacks fatigue strength. Genuine XCMG 860512555 uses premium CuSn8P bronze for maximum service life. Order genuine today and eliminate costly pivot point wear.
Keep spare 860512555 upper bronze sleeves in your parts inventory. A worn sleeve ruins expensive pins and bores. Replace proactively during scheduled maintenance and avoid unplanned downtime. Protect your grader’s circle drive and steering with XCMG original bronze sleeves.
Upgrade your motor grader’s reliability with XCMG genuine upper bronze bushes. Precision machined, oil groove optimized, and 100% inspected – order the 860512555 Upper Bronze Sleeve now and experience smooth, wear‑resistant operation for thousands of hours in the most demanding grading conditions.
