8A31-54-1110 Komatsu Rubber Cushion Damper — Multi-Platform D-Series Mount
OEM-Equivalent • ISO 9001:2015 Certified • D31EX to D85EX • In Stock
Understanding the 8A31-54-1110 Cushion Damper
The 8A31-54-1110 is the most versatile cushion damper in Komatsu's 8A31-54 series, engineered to serve an exceptionally wide range of small-to-mid-size D-series crawler bulldozers. Where other part numbers in the family target a single machine platform, the 8A31-54-1110 spans the full lineup from the compact D31EX and D31PX through mid-range models like the D51EX/PX and D61EX, all the way up to the D65EX/PX and the D85EX. This breadth of compatibility makes it the highest-demand cushion part number in the entire 8A31-54 family, and one of the most frequently ordered rubber mount components for Komatsu equipment worldwide.
Functionally, the 8A31-54-1110 serves as a critical vibration isolation element between the engine-drivetrain assembly and the main dozer frame. During operation, the engine and hydraulic pumps generate continuous cyclic forces that, if transmitted directly to the chassis, would accelerate fatigue cracking in structural welds and frame members. The cushion damper absorbs and attenuates these forces, extending the service life of surrounding components while simultaneously reducing whole-body vibration exposure for the operator — a factor that directly impacts operator comfort, productivity, and long-term health in accordance with ISO 2631 vibration exposure guidelines.
For parts lookup purposes, the cross-reference number 707-99-54150 maps to the 8A31-54-1110 on select machine variants and may appear in certain Komatsu parts catalogs depending on the serial number range. The 8A31-54-1110 belongs to the same product family as the 8A31-54-1130 (designed for the larger D155AX-5 platform) and the 8A31-54-1140 (engineered for the broader D155 series). While all three share similar construction principles — bonded natural rubber with steel reinforcement — they are dimensionally distinct and must not be substituted across machine classes.
Technical Specifications
| Property | Specification |
|---|---|
| Part Number | 8A31-54-1110 |
| OEM Brand | Komatsu |
| Type | Rubber Cushion Damper (Anti-Vibration Mount) |
| Compatible Equipment | Komatsu D31EX, D31PX, D37EX, D37PX, D39EX, D39PX, D51EX, D51PX, D61EX, D61PX, D65EX, D65PX, D85EX |
| Cross-Reference | 707-99-54150 |
| Material | Natural Rubber (NR) Compound |
| Hardness | 55 ± 5 Shore A (ISO 48-4) |
| Tensile Strength | ≥ 12 MPa (ISO 37) |
| Temperature Range | −40°C to +90°C |
| Quality | ISO 9001:2015 Certified |
| Availability | In Stock — Ships Worldwide |
Full Machine Compatibility List
The 8A31-54-1110 cushion damper has been validated for use on the following Komatsu D-series crawler bulldozers. Each model listed below utilizes the same mounting geometry and load specification, ensuring direct bolt-on fitment without modification. If your machine model appears on this list, the 8A31-54-1110 is the correct cushion damper replacement part.
- Komatsu D31EX-21, D31PX-21 — compact crawler dozer
- Komatsu D37EX-21, D37PX-21 — small utility dozer
- Komatsu D39EX-21, D39PX-21 — small crawler dozer
- Komatsu D51EX-22, D51PX-22 — mid-size crawler dozer
- Komatsu D61EX-15, D61PX-15 — mid-size production dozer
- Komatsu D65EX-15, D65PX-15 — mid-size heavy dozer
- Komatsu D85EX-15 — large mid-range crawler dozer
Always verify compatibility with your machine serial number before ordering. Komatsu may have issued engineering changes within a production run that affect cushion mount specifications. Contact us with your serial number for confirmation.
How the 8A31-54-1110 Differs from 8A31-54-1130 and 8A31-54-1140
Komatsu's 8A31-54 cushion damper series includes three primary part numbers, each purpose-built for a different class of crawler dozer. Understanding the differences is essential to avoid ordering the wrong component, as these parts are not interchangeable between machine classes due to significant differences in dimensions, load ratings, and rubber compound durometers.
- 8A31-54-1110 (this page) — Designed for small-to-mid-size dozers from the D31EX through the D85EX. This is the most widely used variant in the series and covers the broadest range of machine platforms.
- 8A31-54-1130 — Engineered specifically for the Komatsu D155AX-5, a significantly larger and heavier platform that demands a cushion damper with greater static load capacity and different physical dimensions.
- 8A31-54-1140 — An alternate cushion damper for the broader Komatsu D155 series, covering additional D155 variants beyond the AX-5 designation.
Installing a cushion damper from the wrong machine class will result in improper vibration isolation, accelerated wear, and potential damage to engine mounting brackets and frame attachment points. When in doubt, confirm the correct part number against your machine's serial number plate and Komatsu parts manual.
Material Quality and Testing
Every 8A31-54-1110 cushion damper we manufacture is produced from a premium natural rubber (NR) compound reinforced with high-abrasion furnace (HAF) grade carbon black. This formulation delivers an optimal balance between elasticity, tear resistance, and long-term fatigue life — the three properties most critical for an engine mount operating under continuous dynamic loading.
The rubber compound includes anti-ozonant waxes and chemical antioxidant additives (IPPD/TMQ system) that protect against surface cracking caused by ozone exposure, UV radiation, and thermal oxidation. These stabilizers are particularly important for machines operating in extreme environments, from sub-zero conditions in northern Canada and Scandinavia to high-heat sites in the Middle East and equatorial regions.
Each production batch undergoes rigorous quality control testing in accordance with international standards: hardness verification per ISO 48-4, tensile strength and elongation-at-break testing per ISO 37, and accelerated heat aging per ISO 188 to simulate years of service life in a controlled laboratory environment. Only batches that pass all criteria receive a Certificate of Conformance and are released for shipment.
Key Features & Benefits
Multi-Platform Versatility
The 8A31-54-1110 covers the widest machine range in the 8A31-54 family — from the compact D31EX through the D85EX. A single part number simplifies inventory management for dealers and fleet operators maintaining mixed D-series fleets. This versatility makes the 8A31-54-1110 the most frequently ordered cushion damper in the series.
Whole-Body Vibration Reduction
Designed to attenuate engine and drivetrain vibrations across the critical 10–400 Hz frequency band, the 8A31-54-1110 helps machine operators stay within the daily vibration exposure limits defined by ISO 2631. Reduced cab vibration improves operator alertness, reduces fatigue, and supports compliance with occupational health regulations in the US and EU.
Extreme Environment Durability
Operates reliably from −40°C winter conditions in Alaska, Canada, and Scandinavia to +90°C engine compartment peaks in Middle Eastern and equatorial jobsites. Dual anti-ozonant protection system (wax migration + chemical stabilizers) prevents surface cracking in ozone-rich environments near electric motors and welding operations.
Long Service Intervals
Engineered for 3,000–6,000 operating hours on small-to-mid-size dozers. HAF carbon black reinforcement delivers exceptional fatigue crack growth resistance, maintaining damping performance through millions of compression cycles. Fewer replacements mean lower total cost of ownership and reduced machine downtime.
Performance Specifications
| Property | Specification | Test Method |
|---|---|---|
| Hardness | 55 ± 5 Shore A | ISO 48-4 |
| Tensile Strength | ≥ 12 MPa | ISO 37 |
| Elongation at Break | ≥ 350% | ISO 37 |
| Compression Set (24h @ 70°C) | ≤ 25% | ISO 815-1 |
| Tear Strength | ≥ 22 kN/m | ISO 34-1 |
| Accelerated Aging (72h @ 100°C) | Hardness change ≤ 8 IRHD | ISO 188 |
| Ozone Resistance (200 pphm, 48h) | No cracks at 20% strain | ISO 1431-1 |
| Operating Temperature | −40°C to +90°C | Continuous |
| Low-Temperature Flexibility | No brittleness at −40°C | ISO 812 |
Maintenance, Inspection & Expected Lifespan
Proactive cushion damper maintenance is essential for preserving the structural integrity and operator comfort of Komatsu D-series bulldozers. A degraded or failed 8A31-54-1110 cushion allows engine vibrations to pass directly into the chassis, accelerating fatigue in structural welds, loosening hydraulic fittings, and increasing cab vibration to levels that exceed ISO 2631 daily exposure guidelines.
Inspection Schedule: Komatsu recommends visual inspection of all anti-vibration mounts every 500 operating hours on D31EX through D65EX models, and every 1,000 hours on the heavier D85EX. During each inspection, examine the rubber surface for cracking (especially ozone-induced surface crazing), measure free height to detect compression set, check for oil or fuel contamination on the rubber surfaces, and verify that mounting bolts remain at correct torque. Document all findings in the machine maintenance log.
Replacement Criteria: Replace the 8A31-54-1110 when: (1) surface cracks exceed 2 mm in depth, (2) permanent compression set exceeds 25% of the original free height, (3) the rubber shows visible swelling from oil or fuel contamination, (4) the operator reports a noticeable increase in cab vibration, or (5) any mounting bolt holes show signs of elongation or wallowing. Under standard duty cycles (8–12 hours per day, moderate temperatures), expect a service life of 3,000 to 6,000 operating hours.
Storage and Handling: Store spare 8A31-54-1110 cushions in a cool, dry, dark location (15–25°C) away from ozone-generating equipment such as electric motors and transformers. Avoid contact with petroleum-based solvents, hydraulic fluids, and direct sunlight. Properly stored natural rubber components retain their properties for up to 5 years from the date of manufacture.
Related Komatsu Cushion Dampers
Frequently Asked Questions
Which Komatsu machines use the 8A31-54-1110?
The 8A31-54-1110 cushion damper fits Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21, D51EX-22, D51PX-22, D61EX-15, D61PX-15, D65EX-15, D65PX-15, and D85EX-15 crawler bulldozers. It is the most widely compatible cushion in the 8A31-54 series. Always verify with your machine serial number before ordering.
Is the 8A31-54-1110 the same as the 8A31-54-1130?
No. The 8A31-54-1110 is designed for small-to-mid-size D-series dozers (D31EX through D85EX), while the 8A31-54-1130 is engineered for the much larger Komatsu D155AX-5. They differ in physical dimensions, load ratings, and rubber compound formulation. The two parts are not interchangeable and must not be substituted for each other.
What does cross-reference 707-99-54150 mean?
The number 707-99-54150 is an alternate Komatsu catalog reference that maps to the 8A31-54-1110 on select machine variants. Both part numbers identify the same cushion damper component, but 707-99-54150 may appear in certain Komatsu parts manuals depending on the machine serial number range. If your parts book lists 707-99-54150, the 8A31-54-1110 is the correct replacement.
How do I know if my D-series dozer needs a new cushion damper?
Common symptoms of a worn 8A31-54-1110 cushion include excessive vibration felt in the operator cab, visible cracking or rubber deterioration on the mount surface, oil contamination around the mounting area, unusual engine movement during startup or shutdown, and misalignment of drivetrain components. We recommend inspecting all cushion mounts during every 500-hour scheduled service interval.
Do you ship the 8A31-54-1110 to the USA and Canada?
Yes. We ship the 8A31-54-1110 to the United States, Canada, Europe, Australia, and over 60 countries worldwide. Standard delivery to the USA and Canada takes 5 to 7 business days via express freight. Every shipment includes a Certificate of Conformance, batch traceability documentation, and full customs paperwork for hassle-free import clearance.