A 12-unit Volvo A30G fleet running haul routes at a copper mine in Arizona was averaging 43 rear-suspension bushing replacements per year — nearly 4 per machine. The haul road had a 14% grade with loaded trucks hitting a sharp transition at the bottom. The maintenance team traced the failures to a combination of heat (ambient 45°C plus exhaust proximity) and impact loading at the grade transition. Switching from standard NR compound bushings to HNBR compound with +120°C rating and 15% higher dynamic load capacity cut replacements to 11 per year — a 74% reduction.
The Volvo A30G and A35G are the most popular articulated dump trucks in US mining and heavy earthmoving operations. Their rubber components work harder than almost any other construction machine: constant articulation, severe haul-road impacts, high heat, and continuous vibration from 11-litre Volvo D11 engines.
Volvo A30G/A35G Rubber Mount Inventory
A single A30G contains over 40 individual rubber components across 7 systems. Here are the critical parts that require scheduled replacement:
Engine Mount System
| Part Number | Description | Position | Qty | Replace Interval |
|---|---|---|---|---|
| 11094408 | Engine mount — front | Front L/R | 2 | 4,000–6,000 hrs |
| 11094043 | Engine mount — rear | Rear L/R | 2 | 5,000–7,000 hrs |
| 11060256 | Transmission mount | Center | 1 | 6,000–8,000 hrs |
Engine mount specs:
– Shore A: 50 ±5
– Static load: 3,200 kg per mount
– Temperature: -40°C to +120°C
– Compound: HNBR (required — NR fails prematurely due to exhaust heat proximity)
The D11H engine in the A30G produces 14% more torque at lower RPM than the previous D11F. This increased low-speed torque loading makes mount compound selection critical — only HNBR rated to +120°C provides adequate service life.
Cab Isolation System
| Part Number | Description | Position | Qty | Replace Interval |
|---|---|---|---|---|
| 14639747 | Cab mount — front | Front L/R | 2 | 5,000–7,000 hrs |
| 14528381 | Cab mount — rear | Rear L/R | 2 | 5,000–7,000 hrs |
| 11197871 | Cab cushion — top | Upper 4 corners | 4 | 4,000–6,000 hrs |
Volvo’s ADT cab uses a 6-point isolation system (4 primary + 2 anti-roll). The front mounts carry 60% of cab weight; the rear mounts provide roll stability on side slopes up to 40%.
ADT-specific requirement: Cab mounts on articulated trucks experience higher lateral loads than excavator cab mounts due to articulation steering. The 14639747 front mount has a built-in snubber that limits lateral travel to ±18mm — generic excavator cab mounts will NOT provide adequate roll control.
Articulation Joint System
The articulation joint is the most stressed rubber application on any construction machine. The A30G’s articulation bearing transfers:
– Full machine load (52,000 kg gross) through a single oscillating joint
– Steering forces up to ±45° in horizontal plane
– Oscillation up to ±12° in vertical plane
| Part Number | Description | Position | Qty | Replace Interval |
|---|---|---|---|---|
| 11052112 | Articulation bushing — upper | Upper bearing | 2 | 3,000–5,000 hrs |
| 11052293 | Articulation bushing — lower | Lower bearing | 2 | 3,000–5,000 hrs |
| 11056565 | Oscillation damper | Center | 1 | 5,000–7,000 hrs |
Critical compound requirement: Articulation bushings must withstand continuous oscillation under extreme load. Shore A 55–65 with minimum 50% elongation at break. These bushings are NOT interchangeable with excavator boom bushings despite similar dimensions.
Suspension Rubber Components
The A30G uses a combination of rubber-metal suspension elements across front and rear axles:
| Part Number | Description | System | Qty | Replace Interval |
|---|---|---|---|---|
| 11056563 | Front suspension rubber | Front axle | 4 | 4,000–6,000 hrs |
| 11060946 | Rear bogie rubber | Rear bogie | 8 | 3,000–5,000 hrs |
| 11190316 | Trunnion bushing | Rear frame | 4 | 5,000–7,000 hrs |
| 16854341 | Steering damper | Steering cylinder | 2 | 6,000–8,000 hrs |
The rear bogie rubber elements absorb the highest impact loads of any component on the machine. Each of the 8 elements carries up to 8,000 kg dynamic load during loaded haul on rough terrain.
Failure Modes: ADT vs. Excavator
ADT rubber parts fail differently than excavator parts. Understanding these failure modes prevents misdiagnosis:
| Failure Mode | Excavator | ADT | Root Cause |
|---|---|---|---|
| Compression set | Gradual (years) | Accelerated (months) | Higher temperature + continuous load |
| Rubber tearing | Rare | Common at articulation | Oscillation under extreme load |
| Oil contamination | Hydraulic leaks | Axle oil + exhaust soot | Proximity to drivetrain |
| Fatigue cracking | Surface only | Through-compound | Impact cycling on haul roads |
| Heat degradation | Moderate | Severe | Exhaust proximity + braking heat |
Key takeaway: Do not use standard NR (natural rubber) compound for any A30G/A35G mount position near the exhaust or drivetrain. HNBR compound rated to +120°C is required for engine mounts, transmission mounts, and rear suspension rubbers.
Maintenance Schedule Summary
For a Volvo A30G running 2,000 hours/year in standard mining haul:
| Service Interval | Action |
|---|---|
| Every 500 hrs | Visual inspection — all mounts and bushings |
| Every 2,000 hrs | Durometer test — engine, cab, and articulation mounts |
| 3,000–5,000 hrs | Replace rear bogie rubbers and articulation bushings |
| 4,000–6,000 hrs | Replace engine mounts (front) and cab cushions |
| 5,000–7,000 hrs | Replace engine mounts (rear), cab mounts, trunnion bushings |
Fleet Kit: A30G Complete Rubber Set
For planned overhauls or new machine commissioning, Babacan Group offers a complete rubber kit for the Volvo A30G:
Kit Contents:
– 4x Engine/transmission mounts
– 6x Cab mounts and cushions
– 4x Articulation bushings + 1x oscillation damper
– 16x Suspension rubbers (front + rear bogie)
– 4x Trunnion bushings
– 2x Steering dampers
Total: 37 components — everything needed for a full rubber renewal.
This kit covers all rubber components that degrade within the first 6,000–8,000 operating hours, providing a single procurement event instead of multiple emergency orders.
Also Compatible: Volvo A25G, A35G, A40G, A45G, A60H
Many rubber components are shared across the Volvo ADT range:
- A25G shares cab mounts with A30G
- A35G shares engine mounts and articulation bushings with A30G
- A40G uses heavier-duty variants — contact us for specific part numbers
- A45G and A60H have unique mount specifications — request verification
Browse all Volvo rubber parts in our catalog.
Order Today
| Option | Details |
|---|---|
| Individual parts | Any part number listed above |
| Fleet kit (1 machine) | 37-piece complete rubber set |
| Bulk order (5+ machines) | Volume pricing + priority production |
| Express shipping | DHL/FedEx to USA — 3–5 business days |
All parts manufactured to ISO 9001:2015 with batch-level testing. HNBR compound standard on all high-temperature positions.
Request a quote — include your machine serial number for exact fitment.
Contact our ADT parts specialists — we support Volvo A-series fleets worldwide.