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Views: 0 Author: Site Editor Publish Time: 01-28-2026 Origin: Site
Under long-haul, heavy-load, frequent stop-and-go, and grade conditions, a HINO truck’s rear axle is continuously subjected to combined loads from drive torque, brake reaction torque, and road impacts. The torque rod (reaction rod / thrust rod) and its torque rod bushings deliver a simple but critical function: securely locate the axle while converting shock and torsional loads into controlled elastic deflection.
During acceleration the axle tends to move rearward; during braking it tends to surge forward. The torque rod bushing uses rubber elasticity and the constraint of the metal sleeves to limit longitudinal axle shift, helping prevent that “rear-end lurch” sensation.
The torque rod/reaction rod stabilizes the torque path; the bushing filters high-frequency torsional vibration, reducing shock transfer into the frame and preventing resonance.
Once torque rod bushings wear and develop looseness, the axle can “float,” leading to instability, wandering, and axle steer. Over time, this accelerates fatigue in tires, leaf springs/air suspension components, and mounting brackets.
The rubber layer’s damping significantly attenuates impact noise and structure-borne vibration, improving cab comfort and reducing “thumping/knocking” from the chassis.
The harsher the duty cycle (heavier, faster, longer), the more likely the bushing is to degrade via shear fatigue, rubber aging, and bond-interface separation. Choosing a high-damping, heavy-duty durability compound and a robust bonding process is a practical way to reduce total maintenance cost.
55541-00Z00 (common variants: 5554100Z00 / 55541 00Z00)
Commonly searched with “torque rod bushing / torque rod rubber / suspension bushing”
In the aftermarket, 49305-1110 is frequently supplied as a corresponding replacement for 55541-00Z00 (the high-frequency query scenario “49305-1110 replacement”).
Because different model years, chassis variants, and suspension configurations may have dimensional differences, B2B procurement is best confirmed by the OEM number + dimensions + installation position combination.
HINO heavy-duty torque rod bushings typically must handle:
High torque input and large shear deflection (heavy-load launch and braking)
Long-duration high-frequency vibration (high-speed trunk routes)
Wet, salty, and oily environments (road de-icing salts and workshop contaminants)
Most applications are at both ends of the rear axle torque rod , where the bushing helps locate the axle and transmit torque.
A typical torque rod bushing consists of an outer metal sleeve, an inner metal sleeve, and a rubber element (often press-fit into the rod eye). It relies on rubber deformation under load to absorb shock and control movement—making it a key NVH component in the suspension system and a core part of “HINO truck torque rod bushing” searches.
NR (Natural Rubber): high elasticity and strong fatigue performance; ideal for heavy-load impact and high-cycle shear deflection
NBR: better oil resistance; suitable for oil-contaminated maintenance and jobsite conditions
EPDM: excellent ozone/weather resistance; suitable for large temperature swings and long-term outdoor exposure
Selection should match the operating environment (oil, salt, temperature), target life, and torsional stiffness requirements.
A common design range is Shore A 60–80, balancing axle locating stiffness and isolation:
Higher hardness: more precise locating and direct handling feel, but less isolation
Lower hardness: better isolation, but insufficient design margin may lead to deformation accumulation and earlier fatigue
Most failures originate from shear fatigue and bond-interface degradation. The compound must deliver not only durability but also stable damping over time to avoid heat build-up and performance drop.
Inner/outer sleeves should use reliable anti-corrosion systems (e.g., phosphating, e-coat, zinc-based coatings) to reduce corrosion in salt-spray and humid environments and protect the bond interface from corrosion propagation.
Even with the same compound, inconsistent bonding systems or poorly controlled cure windows can cause debonding, voids, and interface separation, leading to “looks fine, but already loose” hidden failures.
Once a torque rod bushing wears or becomes loose, symptoms usually appear during load transitions—especially acceleration, braking, cornering, and road shocks:
Rear-end lurch during launch or braking: axle fore–aft movement creates harsh impacts
Rear axle sway and unstable driving: the truck feels “floaty” or wanders in a straight line or during lane changes
Abnormal noise (clunk/knock): “thump/clunk” sounds during decel, turns, or bumps
Rubber aging, cracks, debonding: visible cracks, edge tearing, rubber-metal separation
Abnormal tire wear and higher bracket fatigue risk: looseness increases structural stress and secondary damage
With the vehicle lifted, use a pry bar to check for excessive free play and looseness
Inspect end faces for rotational cracking or windup marks (often linked to incorrect alignment/clocking)
Road test: simulate launch/brake transitions and confirm whether harsh rear impacts and metallic knocks are present
Use proper press tools whenever possible to avoid sleeve deformation or rubber damage from hammering
After removal, check the rod eye and brackets for cracks, oval wear, and deformation
Torque rod bushings are load-direction-sensitive. Incorrect installation can create bushing windup (pre-twist), accelerating rotational cracks and premature failure.
Recommendation: follow service manual alignment requirements, and perform final tightening at normal ride height.
Avoid chronic overload and aggressive launch/harsh braking
Monitor bracket and fastener condition to prevent “looseness → knocking → secondary damage”
In salt-spray regions, strengthen cleaning and anti-corrosion routines
Hebei Huami New Material Technology Co., Ltd. focuses on rubber products and rubber-metal components for heavy-duty chassis NVH and durability requirements, providing torque rod bushing solutions suited to fleets and aftermarket distributors:
30 years of experience in rubber products and rubber-metal components, serving heavy-duty durability needs
Application know-how across HINO and other heavy-truck scenarios, built around “durability first” realities
Compliance & systems support: IATF16949, TÜV, and China Customs AEO Advanced Certification (documentation available for audits)
In-house rubber formulation R&D: high-damping and heavy-duty durable HINO torque rod rubber compound options
Precision tooling + automated production: stable press-fit dimensions and high batch consistency
Full-process quality inspection: hardness / tensile / tear / compression set / bond strength
Reliability validation: fatigue life, salt-spray, oil resistance, weathering, and high/low-temperature testing
OEM/ODM and small-batch customization: development by drawings, samples, or OE standards; stable lead time for stocking programs
Note: The table below is a common configuration template. Dimensions and hardness can be confirmed and customized by chassis/conditions.
| Item | Specification / Notes |
|---|---|
| Product Name | HINO Truck Torque Rod Bushing (Torque Rod Bushing / Torque Rod Rubber) |
| OEM | 55541-00Z00 |
| Replacement OEM | 49305-1110 replacement |
| Structure | Inner sleeve / outer sleeve / high-damping rubber layer |
| Rubber Material | NR / NBR / EPDM (selected by duty cycle) |
| Hardness (Shore A) | 60–80 (customizable) |
| Vehicle Fitment | HINO Trucks (model years/chassis to be confirmed) |
| Installation Position | Rear axle torque rod / reaction rod ends |
| Metal Corrosion Protection | Optional phosphating / e-coat / zinc-based coatings |
It is a rubber-metal torque rod bushing used in HINO truck suspension/rear axle locating systems to control axle position, transmit torque loads, and reduce NVH through damping.
In the aftermarket, 49305-1110 is commonly supplied as a corresponding replacement for 55541-00Z00. Final confirmation should be made by dimensions and installation position.
Typical symptoms include rear-end lurching during braking/acceleration, rear axle sway, clunk/knocking noises, unstable handling, visible cracks, and rubber-metal separation.
Combine three checks: visible cracking/debonding, pry-bar looseness test, and a road test focusing on launch/brake transitions and impact noises.
Incorrect alignment can cause bushing windup (pre-twist), leading to rotational cracking and significantly reduced service life.
NR focuses on elasticity and fatigue durability, NBR improves oil resistance, and EPDM improves weather/ozone resistance—choose based on duty cycle and environment.
A typical range is Shore A 60–80, balancing axle locating stiffness and isolation. Heavy-duty fleets often prioritize durability and thermal stability; hardness can be customized.
Service life depends strongly on load, road conditions, driving habits, installation quality, and fastener torque control. Regular inspection helps prevent secondary damage.
Provide OEM (55541-00Z00 / 49305-1110), vehicle model/chassis, installation position, and dimensions or a sample/drawing.
Yes. We support OEM/ODM, sampling, and small-batch customization with stable lead times and quality documentation.
