Part number 8A31-54-1110 (also written 8A31541110) is the Komatsu OEM designation for this komatsu d85/d155 cabin mount.
8A31-54-1110All data is sourced from Komatsu technical documentation, produced under ISO 9001:2015.
| Part Number | 8A31-54-1110 / 8A31541110 |
|---|---|
| Brand | Komatsu |
| Part Type | Cabin Mount |
| Weight | 6.70 kg |
| Compatible Models | D85AX-15, D155AX-5 |
| Material | NR/SBR rubber compound + steel |
| Mounting | 4-bolt |
| Temperature Range | -40 deg C to +80 deg C |
| Tensile Strength | >= 14 MPa |
| Elongation at Break | >= 300% |
| Certification | ISO 9001:2015 |
A cabin mount (also called a cabin cushion or cab isolator) is a rubber-to-metal bonded vibration isolator placed between the cab structure and the machine's main frame. It prevents harmful whole-body vibration from reaching the operator while supporting the full cab weight under dynamic loads.
Common failure modes: Rubber oxidation and ozone cracking, metal-to-rubber bond failure from overloading, compression set causing permanent height loss, fatigue cracking at resonant frequency excitation.
This part is produced under an ISO 9001:2015 certified quality management system. Dimensional verification and functional testing are performed on every batch. Certificate of conformance available on request.
Contact Babacan Kaucuk with your machine serial number.
ISO 9001:2015 certified OEM-quality parts. Ships from Ankara. 24-hour quote worldwide.
OEM cabin mounts for Komatsu heavy equipment are formulated from natural rubber (NR) or styrene-butadiene rubber (SBR) compounds reinforced with carbon black for dynamic fatigue resistance. Hardness is specified at 40–55 Shore A (ASTM D2240) to deliver the correct balance between vibration isolation effectiveness and static load support under cab weight. Lower Shore A values (40–45) favour vibration attenuation in high-vibration applications such as dozer and grader cabs; higher values (50–60) suit machines where cab stability under slope operation is critical.
Compression set is a critical durability property. OEM specifications require compression set below 25% after 22 hours at 70°C, tested per ASTM D395 Method B. High compression set causes the cab to sit lower over time, losing the designed vibration isolation gap and creating metal-to-metal contact risk at maximum deflection. Tensile strength (ASTM D412 Die C) exceeds 12 MPa and elongation-at-break exceeds 350% in compliant OEM mounts, ensuring the rubber bond resists dynamic tensile loads during cab pitching and rolling on uneven terrain. Ozone resistance (ASTM D1149) prevents surface crazing in outdoor environments where UV and ozone levels are elevated.
Generic aftermarket cabin mounts routinely fail to meet these compound requirements. Deviations of even 5 Shore A points from the OEM specification measurably affect the vibration transmissibility curve, shifting the system resonance frequency and reducing isolation effectiveness at the machine dominant vibration frequency. For operator health (ISO 2631-1 WBV exposure limits), correct mount specification is not a comfort feature — it is a regulatory compliance and occupational health requirement.
This component is rated for continuous operation within the following environmental envelope: temperature range −40°C to +100°C ambient, ozone resistance per ASTM D1149, UV exposure resistance per ASTM D4329. For operation consistently above 40°C ambient — desert or tropical sites — confirm the specific high-temperature compound variant with the Komatsu parts department for your machine serial number range.
Chemical compatibility: rated for water, mineral oil splash, and light fuel contact. Not rated for continuous immersion in hydraulic fluids, aromatic solvents, or biodiesel above B20 concentration. Specify unusual chemical exposure conditions when ordering so the correct compound can be confirmed before dispatch.
All 8A31-54-1110 units are produced under ISO 9001:2015 quality management. Each production batch undergoes dimensional inspection, Shore A hardness verification (ASTM D2240), and adhesion testing (ASTM D429 for bonded parts). Certificate of conformance (CoC) is available on request, identifying production batch, test results, and applicable OEM standard. Traceability marking on each component allows full trace-back to production date, compound batch, and test records.
Request CoC documentation when ordering — provided at no additional cost and essential for fleet warranty management.