The 801737358 Disc Spring A140-1 is a genuine OEM Belleville spring washer manufactured by XCMG for motor graders and heavy construction equipment. This precision‑formed conical spring, also known as a disc spring or cone washer, provides high spring force in a compact axial space for preloading bearings, clutch packs, and hydraulic valves on XCMG GR series motor graders. Manufactured from chrome‑vanadium spring steel with precision‑ground edges and a corrosion‑resistant phosphate finish, the 801737358 disc spring is designed to withstand millions of load cycles without losing preload in demanding grading environments.
The disc spring A140-1 dimensions – 140 mm outer diameter, 72 mm inner diameter, and 8 mm thickness – are standard for many power shift clutch packs on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. This disc spring directly replaces worn, cracked, or fatigued springs in the transmission clutch pack, parking brake assembly, circle drive clutch, and hydraulic valve pilot sections. The spring features a precision‑ground outer edge and a slight conical angle (10° typical) that produces a progressive spring rate.
A weak or broken disc spring causes clutch slippage, improper bearing preload, or valve sticking. Replacing a damaged disc spring with the genuine XCMG 801737358 restores correct clamping force, ensures smooth power transmission, and extends the life of your grader’s drivetrain.
| Parameter | Specification |
|---|---|
| OEM Number | 801737358 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Disc Spring (Belleville Washer / Conical Spring) |
| Outer Diameter (De) | 140 mm ±0.5 mm |
| Inner Diameter (Di) | 72 mm ±0.5 mm |
| Thickness (t) | 8.0 mm ±0.1 mm |
| Cone Height (free) – h0 | 2.8 mm ±0.15 mm |
| Cone Angle | 10° ±1° |
| Material | Chrome‑vanadium spring steel (51CrV4 / DIN 1.8159) |
| Hardness | 44 – 52 HRC |
| Force at Flat (deflection = h0) | 22,000 N (± 10%) at 2.8 mm deflection |
| Spring Rate (progressive) | 7,850 N/mm (initial) to 12,400 N/mm (near flat) |
| Fatigue Life | ≥ 2 million cycles at 75% of flat load |
| Surface Finish | Manganese phosphate coating (20‑30 μm) + oil dip |
| Operating Temperature | -40°C to +150°C |
| Standards | DIN 2093, ISO 9001:2024 |
| Compatible Models | XCMG GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350 |
| Applications | Power shift clutch packs, parking brake spring preload, circle drive friction clutch, hydraulic relief valve springs |
The XCMG 801737358 Disc Spring A140-1 provides concentrated spring force in applications where conventional coil springs would be too large. In the power shift transmission, a stack of disc springs is used to preload the clutch pack. Correct preload ensures smooth engagement, prevents slippage, and distributes wear evenly across the friction plates. A fatigued disc spring reduces clamping force, leading to clutch slippage, shudder, and eventual transmission failure.
The disc spring also serves in the parking brake assembly, providing the spring force to hold the brake engaged when hydraulic pressure is released. A broken disc spring can cause loss of parking brake function, a serious safety hazard. In the circle drive clutch, the disc spring maintains friction plate engagement for smooth circle rotation under load.
In hydraulic systems, disc springs are used as pilot relief valve springs, maintaining precise pressure settings. A weakened disc spring causes the relief valve to open too early or too late, affecting the performance of hydraulic cylinders. The 801737358 disc spring is engineered for consistent load‑deflection characteristics over millions of cycles, ensuring long‑term system reliability.
Each 801737358 disc spring is stamped from precision‑rolled spring steel strip, then formed in a multi‑stage die to create the exact cone geometry. The inner and outer edges are ground to remove burrs and to ensure consistent contact with the mating surfaces. The springs are then heat‑treated (austenitized, quenched, tempered) to achieve the specified hardness of 44‑52 HRC.
After heat treatment, the springs are shot‑peened to induce compressive residual stresses, improving fatigue life. Each spring is then phosphate‑coated and oil‑impregnated for corrosion protection. 100% of springs are load‑tested on a servo‑hydraulic press to verify the force at flat deflection (±10% tolerance). Random samples are fatigue‑tested for 2 million cycles.
XCMG’s quality system ensures complete traceability. Each spring is marked with a batch code and the XCMG logo. The spring is packed in a sealed anti‑rust bag, accompanied by a certificate of conformance listing the measured load.
When replacing disc springs in a clutch pack, always replace all springs in the stack simultaneously. Disc springs can be stacked in parallel (increasing force), series (increasing deflection), or combined arrangements. The 801737358 spring is designed for series stacking in most XCMG applications – consult the workshop manual for the correct number of springs and orientation.
Before assembly, clean the spring pockets and mating surfaces. Inspect the spring for nicks or edge damage; discard any spring with a visible defect. Arrange the springs with alternating cone directions (() or ()) as specified. Use a press to compress the stack to the assembled height. Measure the spring force using a load cell, or verify the compressed length against specification.
Do not reuse old disc springs – they will have taken a permanent set and lost preload. Always use new genuine 801737358 springs. Over‑compression beyond flat reduces spring life; never compress a disc spring more than 75% of its flat deflection for normal operation.
Aftermarket disc springs are often made from lower‑grade steel that loses preload after a few hundred heat cycles. They may also have inconsistent geometry, causing unequal clamping force across the clutch pack. The genuine XCMG spring is manufactured to DIN 2093 with certified material, ensuring constant load‑deflection characteristics.
Counterfeit disc springs may have missing edge chamfers or improper heat treatment, leading to cracking at the inner diameter. The 801737358 spring is shot‑peened and edge‑ground, eliminating stress risers. Genuine springs are 100% load‑tested; counterfeit springs are not. Using genuine springs prevents clutch slippage, transmission damage, and safety brake failure.
XCMG provides a 12‑month warranty against manufacturing defects. Each spring pack includes the part number and XCMG logo. Choose genuine for reliable, predictable spring performance.
Common signs of disc spring failure include: clutch slippage under load (engine revs but speed does not increase), transmission shudder during shifting, parking brake unable to hold the grader on a slope, and hydraulic system pressure instability. Cracks on the spring surface (visible after cleaning) or a reduction in the uncompressed cone height indicates fatigue.
Preventive replacement is recommended during any transmission rebuild or clutch pack overhaul (every 6,000‑8,000 operating hours). The cost of a disc spring set is low compared to the cost of a failed transmission. Always replace all springs in a stack, not just the broken ones.
Keep a complete set of 801737358 disc springs in your parts inventory. A broken spring can cause sudden loss of drive or braking. Replace immediately if any spring shows cracking or permanent set.
The 801737358 Disc Spring A140-1 is stocked in XCMG regional warehouses in North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for urgent repairs. Bulk orders (50+ springs) receive volume discounts and can be shipped via sea freight.
Each spring is individually wrapped in anti‑corrosion paper or supplied in sealed bags. For large fleets, consignment stock programs are available to ensure immediate availability and reduced downtime. Don’t let a broken disc spring disable your grader’s transmission or brakes.
Order the genuine XCMG 801737358 Disc Spring A140-1 today and restore proper clutch preload and parking brake function. This disc spring is a critical component for power shift transmissions, parking brakes, and hydraulic valves. Keep a spare set in your service truck for every clutch overhaul, and always replace with genuine XCMG parts.
Upgrade your motor grader’s drivetrain reliability with XCMG genuine disc springs. Engineered for high force, long fatigue life, and precise load retention – order now and experience the quality that keeps your grader shifting smoothly and braking safely.
