The genuine XCMG 800370357 Parking Brake Flange is a precision‑forged, high‑strength component engineered for XCMG GR series motor graders. This OEM flange connects the parking brake drum to the output shaft of the transmission or final drive, transmitting holding torque to keep the machine stationary on slopes or during service. Manufactured from high‑grade alloy steel (42CrMo4) with induction‑hardened friction surfaces, the 800370357 parking brake flange provides reliable, long‑lasting brake engagement against brake pads/shoes. The flange is precision‑machined to exact dimensions, with a smooth friction face (Ra ≤1.6 μm) that ensures consistent braking performance without judder.
The 800370357 flange features a splined inner bore (or keyway) that mates with the transmission output shaft, and a bolt circle for attaching the brake drum/puck assembly. The mounting holes are drilled and counterbored to accommodate high‑strength cap screws, ensuring secure attachment under vibration. The flange is dynamically balanced to reduce rotational vibration, and the friction surface is hardened to 55–60 HRC to resist wear and grooving. This OEM flange directly replaces worn or damaged parking brake flanges on GR135, GR165, GR180, GR215, GR260, GR300, GR350, and GR2003 graders.
A cracked, worn, or out‑of‑square parking brake flange reduces brake holding force, causes uneven lining wear, and can lead to dangerous machine rollaway. Replacing a failed flange with genuine XCMG 800370357 restores full parking brake capacity and ensures operator safety. Keep this critical component in your parts inventory for rapid drivetrain or parking brake system repairs.
| Parameter | Specification |
|---|---|
| OEM Number | 800370357 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Parking Brake Flange / Holding Brake Flange |
| Outer Diameter | 210.0 mm (±0.2 mm) |
| Inner Spline Bore (diameter) | 45.0 mm (involute spline, 22 teeth, module 1.5) |
| Flange Thickness (overall) | 28.0 mm (±0.15 mm) |
| Friction Surface Diameter | 180.0 mm (effective) |
| Bolt Circle Diameter (PCD) | 8 holes, 165 mm PCD, M12 x 1.75 thread |
| Material | Alloy steel (42CrMo4 / AISI 4140), forged blank |
| Heat Treatment | Through‑hardened + tempered (38–42 HRC core), induction hardening on friction face (55–60 HRC, depth 1.5 mm) |
| Friction Surface Finish | Ra 1.6–3.2 μm (ground, non‑directional) |
| Dynamic Balance Grade | ISO 21940 G16 (max residual unbalance 80 g·mm) |
| Max Static Brake Torque Capacity | 2,500 Nm (1,844 lb‑ft) with XCMG brake pads |
| Corrosion Protection | Zinc‑nickel plating (720h salt spray) or phosphate oil |
| Operating Temperature Range | -40°C to +150°C (-40°F to +302°F) |
| Standards Compliance | ISO 9001, XCMG Q/XCMG 1128-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350, GR2003 |
| Superseded Part Numbers | 800369880, 800370200, 800370350, 800370356 |
The 800370357 parking brake flange is the foundation of the grader’s secondary braking system. When the operator engages the parking brake, a spring‑applied or mechanically actuated caliper/pad assembly clamps onto the friction surface of this flange, generating holding torque.
A cracked or worn flange can cause the brake to slip, leading to machine rollaway on a slope – a serious safety hazard. The flange is directly mounted to the transmission output shaft, so any imbalance or runout can cause vibration that damages the transmission output bearings.
The induction‑hardened friction surface resists abrasion and maintains a stable coefficient of friction over thousands of brake applications. Over time, the flange surface may become grooved or heat‑checked, reducing brake effectiveness. Replacing the flange with genuine XCMG 800370357 restores original holding capacity.
XCMG manufactures the 800370357 flange from a hot‑forged billet of 42CrMo4 alloy steel. The forging process refines the grain structure, eliminating porosity and aligning the metal flow for high torsional strength.
After heat treatment, the flange is turned and ground on CNC lathes. The inner spline is broached to DIN 5480 class 5 tolerance, ensuring a precise fit with the output shaft without backlash. The bolt holes are drilled and counterbored using a carbide drill jig for perfect positional accuracy.
The friction surface is ground to achieve flatness within 0.03 mm and a specific surface roughness (Ra 1.6–3.2 μm) that provides optimal initial bite with XCMG brake pads. The flange is then dynamically balanced to G16 grade, ensuring smooth rotation at up to 2,500 rpm.
Before installing a new 800370357 flange, clean the output shaft spline and apply a thin film of anti‑seize. Slide the flange onto the shaft, ensuring the splines align fully. Install the retaining nut/washer and torque to the factory specification (typically 220 Nm for M24 nut).
Using a dial gauge, measure the flange face axial runout – it must not exceed 0.15 mm. Excessive runout will cause brake pad grab and pulsation. If out of spec, check for shaft damage or debris under the flange. Install the brake drum or caliper, then adjust the parking brake according to the service manual.
After installation, engage the parking brake and rock the machine to verify holding force. Perform a static test on a 15% slope – the grader must remain stationary for at least 5 minutes. Keep spare 800370357 flanges in your shop to facilitate quick brake system overhauls.
Aftermarket parking brake flanges are often made from low‑grade carbon steel (e.g., C45) that lacks induction hardening, causing the friction surface to wear rapidly and develop grooves within 500 brake applications. Many have poor spline accuracy, leading to shaft wear and brake judder.
Counterfeit flanges may have incorrect bolt hole spacing, making them impossible to mount without re‑drilling – a dangerous practice that weakens the flange. Some are not balanced, causing severe vibration that can damage the transmission output bearings and seals.
Genuine XCMG 800370357 flanges are forged, heat‑treated, and 100% inspected for hardness, spline fit, and balance. XCMG provides a 12‑month warranty. Using OEM parts ensures the parking brake meets original holding force standards and protects the machine from rollaway accidents.
Audible signs: grinding or squealing noise when parking brake is applied, or a metallic rubbing sound while driving (due to warped flange contacting caliper). Visual signs: deep grooves (>0.5 mm) or heat checking (crazing) on the friction surface, cracked mounting ears, or rust pitting.
Preventive replacement is recommended every 4,000 operating hours or during a transmission overhaul. The flange friction surface should be inspected whenever parking brake pads are replaced – if any scoring is felt with a fingernail, replace the flange. Allowing the flange to wear beyond limit will accelerate pad wear and reduce holding torque.
Keep a stock of 800370357 flanges in your fleet inventory. When a grader comes in for drivetrain service, replace the parking brake flange proactively. This small‑cost component prevents brake failure and potential equipment damage or injury.
The XCMG 800370357 Parking Brake Flange is stocked in regional hubs: Houston (USA), Rotterdam (Netherlands), Dubai (UAE), and Shanghai (China). Standard air freight delivers within 2–5 business days worldwide.
Expedited courier (DHL/FedEx) provides 1–2 day delivery for urgent safety repairs. Bulk orders of 3+ flanges receive volume discounts and can be shipped by sea freight. Each flange is individually packed in a foam‑lined box with anti‑rust coating.
For large fleets, consignment stock programs are available. Our parts specialists can assist with brake system diagnosis and flange selection. Use the buttons above to request a quote or email our support team.
Don’t risk parking brake failure – a worn flange can lead to rollaway accidents. Order the genuine XCMG 800370357 Parking Brake Flange today and ensure your grader remains secure on any slope. Safety starts with genuine components.
Upgrade your grader’s brake system reliability with XCMG genuine parking brake flanges. Engineered for high holding torque, wear resistance, and precise fit. Use the buttons above to request a quote – keep your XCMG grader safe and compliant. Choose 800370357 OEM.
