Hendrickson RT/RTE Mechanical Suspension

Quick Facts

Manufacturer: Hendrickson
Product Type: Heavy-duty rear mechanical suspension
Suspension Design: Steel leaf springs with equalizing beams
Suspension Position: Tandem rear axles
Primary Models: RT and RTE Series
Published Capacity Range: 34,000 to 65,000 pounds across listed RT configurations
Common Vocational Capacities: 40,000 and 46,000 pounds
Primary Applications: Dump, refuse, mixer, mining, military, crane, platform, and other vocational trucks
Operating Environment: On-highway and off-highway vocational service
Common Axle Spacings: 52, 54, 56, 60, and 72.5 inches in listed configurations
Optional Equipment: Shock absorbers and application-specific transverse torque rods
Page Slug: hendrickson-rt-rte-mechanical-suspension

Overview

The Hendrickson RT and RTE are heavy-duty tandem rear mechanical suspensions built around steel leaf springs and equalizing beams. The design distributes load between the forward and rear axles while providing the strength, stability, and articulation required by vocational trucks.

The RT has a long history in dump, mixer, refuse, mining, military, and other demanding applications. Hendrickson-designed steel springs provide a consistent spring rate, while the walking-beam arrangement helps maintain load distribution and tire contact over uneven terrain.

The RTE uses an extended-leaf spring arrangement designed to improve lightly loaded ride quality. As payload increases, additional portions of the spring engage, shortening the effective spring length and increasing support for the loaded vehicle.

These suspensions are mechanically operated and do not require air springs, suspension air lines, or height-control valves.

Key Characteristics

Heavy-duty tandem rear steel-spring suspension
Equalizing-beam design distributes weight between both axles
Designed for demanding vocational operation
Available in multiple capacities and axle spacings
Consistent steel spring rate for durability
RT design prioritizes simplicity, stability, and load support
RTE design provides a more progressive response between unloaded and loaded operation
Rubber or bronze center-bushing options depend on capacity and configuration
Transverse torque rods are available or required for certain severe-service arrangements
Optional shock absorbers can improve ride control
Suitable for on-highway and off-highway work
Can serve as the foundation for an approved Hendrickson AR2 air-suspension conversion

Major Components

Steel leaf-spring assemblies
Extended spring leaves on RTE configurations
Equalizing beams
Spring saddle assemblies
Front spring hangers
Intermediate and rear spring hangers
Center bushings
Beam-end bushings
Axle brackets
Longitudinal torque rods
Transverse torque rods where specified
Spring seats and wear plates
Center-bushing cross tube where applicable
Optional shock absorbers
Rebound-control components
Alignment shims
U-bolts, mounting bolts, washers, and locknuts
Tandem drive axles, brakes, and wheel ends supplied with the complete chassis

How the Suspension System Works

The RT/RTE system uses steel leaf springs to carry the weight of the frame, body, equipment, and payload. The spring assemblies are mounted above saddle assemblies connected to the equalizing beams.

As the truck crosses uneven ground, the equalizing beams pivot around their center connections. This allows one axle to rise while the other moves downward and helps distribute weight between the tandem axles.

The steel leaf springs flex as the vehicle encounters bumps or carries additional weight. Their movement absorbs part of the road shock before it reaches the chassis.

On RTE configurations, extended upper spring leaves increase the effective spring length when the truck is unloaded or lightly loaded. This produces a softer response. As payload is added, the extended leaves deflect and contact an additional hanger, shortening the working spring length and increasing the effective spring rate.

Torque rods control braking, acceleration, lateral, and rotational axle forces. Optional shock absorbers help damp repeated spring and axle movement.

Suspension Position and Function

RT and RTE suspensions are installed beneath the rear of a vocational truck. They connect the tandem rear axles to the chassis and support the vehicle body, equipment, and payload.

The suspension performs several functions:

Supports the rear chassis and payload
Distributes weight across the tandem axle group
Allows controlled axle articulation
Helps maintain tire contact on uneven terrain
Controls axle movement during braking and acceleration
Provides loaded roll stability
Absorbs road shock through steel spring deflection
Maintains axle position beneath the frame
Transfers propulsion and braking forces into the chassis

Common Specifications

RT 343 Capacity: 34,000 pounds
RT 343 Installed Weight: Approximately 1,199 pounds
RT 343 Site-Travel Rating: 46,000 pounds
RT 343 Approved GVW: Up to 60,000 pounds
RT 343 Approved GCW: Up to 125,000 pounds
RT 403 Capacity: 40,000 pounds
RT 403 Installed Weight: Approximately 1,207 pounds
RT 403 Site-Travel Rating: 55,000 pounds
RT 403 Approved GVW: Up to 73,000 pounds
RT 403 Approved GCW: Up to 160,000 pounds
RT 463 Capacity: 46,000 pounds
RT 463 Installed Weight: Approximately 1,301 pounds
RT 463 Site-Travel Rating: 60,000 pounds
RT 463 Approved GVW: Up to 80,000 pounds
RT 463 Approved GCW: Up to 190,000 pounds
RT 503 Capacity: 50,000 pounds
RT 503 Installed Weight: Approximately 1,418 pounds
RT 503 Site-Travel Rating: 65,000 pounds
RT 503 Approved GVW: Up to 80,000 pounds
RT 503 Approved GCW: Up to 225,000 pounds
RT 523 Capacity: 52,000 pounds
RT 523 Installed Weight: Approximately 1,443 pounds
RT 523 Site-Travel Rating: 65,000 pounds
RT 523 Approved GVW: Up to 80,000 pounds
RT 523 Approved GCW: Up to 245,000 pounds
RT 650 Capacity: 65,000 pounds, with application details requiring Hendrickson engineering review
RTE 343 Capacity: 34,000 pounds
RTE 343 Installed Weight: Approximately 1,253 pounds
RTE 403 Capacity: 40,000 pounds
RTE 403 Installed Weight: Approximately 1,242 pounds
RTE 463 Capacity: 46,000 pounds
RTE 463 Installed Weight: Approximately 1,338 pounds
RTE 503 Capacity: 50,000 pounds
RTE 503 Installed Weight: Approximately 1,465 pounds
Listed Axle Spacings: 52, 54, 56, 60, and 72.5 inches

Published installed weights are based on 54-inch axle spacing and include the suspension, torque rods, axle brackets, and frame brackets. Actual specifications depend on the vehicle configuration.

Capacity, Ride Height, and Axle Travel

RT and RTE models cover a broad capacity range, but the 40,000- and 46,000-pound versions are among the most common vocational configurations. Higher-rated systems are available for heavier specialty applications.

As mechanical steel-spring suspensions, RT and RTE do not maintain a constant chassis height. The springs flatten and the frame settles as payload is added. Available upward and downward axle travel therefore changes with vehicle loading.

Axle travel and articulation depend on the spring package, equalizing-beam length, hanger arrangement, center connection, tires, frame clearances, brake components, and axle spacing.

The suspension rating cannot be used by itself to establish legal or safe vehicle capacity. Axles, brakes, tires, wheels, frame, body, and applicable regulations may impose lower limits.

Ride Quality and Load Distribution

The equalizing beams help distribute load between the forward and rear axles. When one axle rises over an obstacle, the beam pivots and transfers part of the movement and weight to the other axle.

The RT uses a conventional steel-spring arrangement with a relatively consistent spring response. It is designed around durability and vocational performance rather than premium unloaded ride quality.

The RTE’s extended leaves create a longer effective spring when the vehicle is lightly loaded. As the load increases, the extended leaves contact an additional hanger, shortening the effective spring length and providing the firmer response needed for loaded stability.

Optional shock absorbers can reduce continued bouncing and axle hop, but the suspension will generally provide a firmer ride than a comparable rear air suspension.

Suspension Controls and Adjustment Options

RT and RTE suspensions do not use driver-operated controls, air springs, suspension dump valves, or height-control valves. Their response is determined mechanically by the steel springs, equalizing beams, bushings, torque rods, and optional shock absorbers.

Service-related adjustments may include:

Tandem axle alignment through approved beam-end connections or alignment components

Transverse torque-rod adjustment where an adjustable rod is installed

Spring and hanger positioning during component replacement

Driveline-angle correction according to vehicle-manufacturer procedures

Brake and wheel-end adjustments according to axle-manufacturer specifications

Mechanical ride height is not normally adjusted in the same manner as an air suspension. A truck that sits too low may have overloaded, worn, damaged, or incorrect springs.

Alignment and Suspension Geometry

Correct axle alignment limits tire scrub, poor tracking, steering correction, and unnecessary rolling resistance. Both tandem axles must be properly positioned relative to the frame and each other.

Alignment should be checked after replacing equalizing beams, beam-end bushings, axle brackets, torque rods, springs, or related mounting components.

Important inspection points include:

Tandem axle thrust angle
Axle spacing
Beam-end connections
Center bushings
Equalizing-beam condition
Axle brackets
Longitudinal and transverse torque rods
Spring saddles
Frame brackets
Alignment shims
Driveline angles

Rear suspension misalignment can cause drive-tire wear, vehicle dog tracking, and even unusual front tire wear.

Axle, Brake, and Wheel-End Options

RT and RTE suspensions are used with compatible heavy-duty tandem drive axles. Drive-axle model, gear ratio, differential type, interaxle differential, brake package, and wheel ends are selected as part of the complete chassis.

Depending on the truck and axle generation, configurations may use drum brakes or air disc brakes. Hub, bearing, seal, tire, and wheel choices vary by axle manufacturer and vehicle application.

Wide-base or dual-tire installations require sufficient clearance around springs, beams, brakes, frame brackets, and torque rods.

The lowest-rated component determines the usable vehicle capacity. A suspension rated above the axle or tire capacity does not increase the legal axle-group rating.

Common Applications

Dump trucks
Concrete mixer trucks
Refuse trucks
Mining vehicles
Military trucks
Crane and boom trucks
Platform trucks
Construction vehicles
Oilfield equipment
Municipal service trucks
Water trucks
Snowplows
Heavy equipment transport support vehicles
Other severe vocational trucks

Vehicle, Axle, and Frame Compatibility

Compatibility depends on the vehicle manufacturer, frame width, axle spacing, equalizing-beam length, suspension capacity, saddle height, axle brackets, torque rods, driveline geometry, brake package, tires, and intended application.

Listed equalizing-beam lengths support axle spacings of approximately 52, 54, 56, 60, and 72.5 inches. A transverse torque-rod arrangement is recommended for refuse or severe-service operation and is standard on listed systems with axle spacing of 60 inches or more.

The RT/RTE architecture has been widely used on vocational truck chassis, but individual models and parts have changed over its long production history. The vehicle identification number and suspension production details should be checked before ordering components.

Advantages

Long history of vocational service
Simple mechanical load-support system
No suspension air springs or height-control valves
Equalizing beams distribute weight between the tandem axles
Good traction on uneven surfaces
Strong loaded roll stability
Wide range of capacity ratings
Multiple axle-spacing configurations
Consistent steel spring characteristics
RTE design improves lightly loaded ride compared with a basic fixed-rate arrangement
Heavy-duty center-bushing options
Optional shocks for improved ride control
Broad parts and service familiarity within the heavy-truck industry
Can be converted to an approved Hendrickson AR2 air-over-walking-beam system in compatible applications

Limitations or Considerations

Heavier than many newer rubber or air suspension systems
Firmer unloaded ride than most rear air suspensions
Steel springs and wear components require regular inspection
Does not automatically maintain chassis ride height
Center bushings require inspection and eventual replacement
Bronze center bushings may require lubrication and additional maintenance
Worn spring leaves can alter chassis height and load distribution
Loose U-bolts or axle brackets can permit component movement
High-capacity applications may require Hendrickson engineering approval
Replacement components vary by model, axle spacing, capacity, and production period
Suspension capacity does not establish legal vehicle payload
Steel suspension components can corrode in harsh operating environments

Driver and Operator Experience

RT and RTE suspensions provide a direct, stable feel when the truck is loaded. This is useful during dumping, mixer operation, refuse collection, and travel over uneven work sites.

The RT can feel firm when the truck is empty because its steel springs must also support the vehicle at full payload. The RTE’s extended-leaf arrangement is designed to improve lightly loaded ride without giving up the support required under heavier loads.

Operators should report excessive bouncing, leaning, clunking, axle hop, poor tracking, or sudden changes in chassis height. These symptoms may indicate spring damage, worn bushings, loose brackets, failed shocks, or axle misalignment.

Maintenance and Ownership Notes

Inspect steel spring leaves for cracks, breaks, corrosion, shifting, or abnormal wear.
Check spring eyes, extended leaves, and contact areas on RTE configurations.
Inspect equalizing beams for cracks, damage, or unauthorized repairs.
Check center bushings for wear, deterioration, movement, and lubrication requirements.
Inspect beam-end bushings and axle brackets.
Check spring saddles, wear plates, and hanger contact areas.
Inspect longitudinal and transverse torque rods and their bushings.
Check U-bolts and structural fasteners using approved torque procedures.
Inspect optional shock absorbers for leakage, damage, and worn mounting bushings.
Check tandem axle alignment and drive-tire wear.
Inspect frame brackets and crossmembers for cracking or looseness.
Verify that spring and suspension components match on both sides.
Follow Hendrickson and vehicle-manufacturer lubrication schedules.
Never weld, heat, bend, drill, or straighten structural suspension components unless an approved procedure specifically permits the work.

Common Suspension Problems

Cracked or broken spring leaves
Sagging or permanently deformed spring packs
Shifted spring leaves
Worn spring contact surfaces
Worn rubber center bushings
Worn or improperly lubricated bronze center bushings
Worn beam-end bushings
Loose U-bolts or axle brackets
Damaged equalizing beams
Worn saddle or hanger components
Loose frame brackets
Worn torque-rod bushings
Bent or damaged torque rods
Leaking or ineffective shock absorbers
Axle hop during acceleration or braking
Vehicle dog tracking
Tandem axle misalignment
Irregular drive-tire wear
Excessive empty-ride harshness
Suspension clunking or metal-to-metal noise
Uneven chassis height

Identification Information

Begin identification with the vehicle identification number, manufacturer build sheet, suspension model, axle spacing, capacity, and production date.

Important identification information includes:

Vehicle identification number
Truck manufacturer and model
Vehicle model year
RT or RTE designation
Complete model number
Suspension capacity
Axle spacing
Equalizing-beam length
Saddle height
Center-bushing type
Spring assembly number
Equalizing-beam part number
Axle-bracket configuration
Torque-rod arrangement
Shock-absorber configuration
Existing component numbers

The final number in older designations such as RT 403 or RT 463 helps distinguish the model series, but the complete suspension and vehicle information should always be used when ordering parts.

Buying Considerations

Confirm whether the suspension is RT or RTE.
Identify the complete model and rated capacity.
Measure or verify the axle spacing.
Determine whether the center bushings are rubber or bronze.
Inspect every spring leaf for cracking, shifting, or corrosion.
Check spring height and compare both sides of the truck.
Inspect center and beam-end bushings for movement.
Examine the equalizing beams for damage or unauthorized welding.
Check axle brackets, saddles, hangers, and frame mounts.
Inspect torque rods and optional shock absorbers.
Examine drive tires for evidence of tandem misalignment.
Road-test the vehicle for axle hop, clunking, harshness, and poor tracking.
Review lubrication and bushing-replacement records.
Confirm parts availability using the VIN and suspension identification.
Determine whether an AR2 conversion is practical if improved ride quality is needed.

Variants and Configurations

RT 343: 34,000-pound tandem steel-spring suspension.
RT 403: 40,000-pound tandem steel-spring suspension.
RT 463: 46,000-pound tandem steel-spring suspension.
RT 503: 50,000-pound tandem steel-spring suspension.
RT 523: 52,000-pound tandem steel-spring suspension.
RT 650: 65,000-pound specialized configuration requiring application-specific engineering information.
RTE 343: 34,000-pound extended-leaf tandem suspension.
RTE 403: 40,000-pound extended-leaf tandem suspension.
RTE 463: 46,000-pound extended-leaf tandem suspension.
RTE 503: 50,000-pound extended-leaf tandem suspension.
Rubber Center-Bushing Configuration: Commonly associated with 40,000-pound systems and designed to reduce maintenance.
Bronze Center-Bushing Configuration: Used on many 46,000- to 52,000-pound systems for heavy-duty service.
Shock-Equipped Configuration: Uses optional dampers to improve ride control and reduce repeated suspension movement.
Transverse Torque-Rod Configuration: Recommended for refuse and severe-service operation and standard on certain long axle-spacing systems.

Comparison to Similar Equipment

Compared with the Hendrickson HN Vocational Suspension, RT/RTE uses steel leaf springs and center-pivot equalizing beams. HN uses rubber VariRate bolster and auxiliary springs and eliminates the traditional center-bushing arrangement.

The Hendrickson HAULMAAX EX is a newer rubber suspension designed to reduce weight and maintenance while providing a better balance of unloaded ride and loaded stability.

Compared with the Hendrickson PRIMAAX EX, RT/RTE is a mechanical steel-spring suspension rather than an air suspension. RT/RTE offers mechanical simplicity, while PRIMAAX EX provides improved ride isolation and automatic height control.

The Hendrickson AR2 is an air-over-walking-beam suspension available as a conversion for many compatible RT/RTE systems. It replaces steel spring load support with air springs while retaining portions of the walking-beam arrangement.

Best Fit For

Dump, mixer, refuse, and construction fleets
Vocational vehicles requiring strong loaded stability
Operations favoring proven mechanical suspension technology
Trucks working in mining, oilfield, military, or municipal service
Applications requiring 34,000- to 52,000-pound tandem capacities
Specialized vehicles requiring higher application-approved ratings
Fleets with established maintenance experience supporting steel-spring walking-beam suspensions
Operators who prioritize durability and load support over premium unloaded ride quality

Related Vehicle and Trailer Types

Complete Guide to Semi Truck Types
Dump trucks
Concrete mixer trucks
Refuse trucks
Mining trucks
Military vehicles
Crane and boom trucks
Platform trucks
Oilfield vehicles
Municipal service trucks
Heavy vocational trucks

Related Truck and Trailer Models

Related Suspension Types

Mechanical & Leaf Spring Suspensions
Vocational & Severe-Duty Suspensions
Hendrickson HN Vocational Suspension
Hendrickson HAULMAAX EX
Hendrickson PRIMAAX EX
Steel leaf-spring suspensions
Walking-beam suspensions
Rubber bolster-spring suspensions
Vocational rear air suspensions
Air-over-walking-beam suspensions

Related Equipment Systems

Related Guides

Regulatory and Compliance Notes

An RT/RTE-equipped truck must remain within all applicable gross vehicle, axle-group, bridge-formula, tire, wheel, brake, frame, and roadway limits. Suspension capacity does not establish legal payload by itself.

Published job-site travel ratings are limited to no more than 5 percent of vehicle operation at speeds not exceeding 5 mph. The axle manufacturer’s limitations and suspension site-travel rating must not be exceeded.

The vehicle manufacturer determines the final vehicle capacity. High-capacity and unusual applications may require Hendrickson engineering approval.

Structural suspension components should not be welded, heated, bent, drilled, or modified without specific manufacturer authorization.

Real World Operating Notes

RT/RTE suspensions are best known for durability and loaded vocational performance. They are not designed to feel like a highway air suspension when the truck is empty.

The RTE can offer a noticeable ride advantage over a basic steel-spring arrangement because its extended leaves provide a longer effective spring when lightly loaded. The suspension becomes firmer as load causes those leaves to engage the additional hanger.

Center-bushing maintenance is important. Excessive wear can create noise, poor axle control, uneven tire wear, and damage to surrounding components.

Frequently Asked Questions

Is the Hendrickson RT/RTE an air suspension?

No. RT and RTE are mechanical tandem suspensions using steel leaf springs and equalizing beams.

What is the difference between RT and RTE?

The RTE uses extended upper spring leaves to provide a longer effective spring when lightly loaded. As payload increases, the extended leaves contact an additional hanger and increase loaded support.

What capacities are available?

Published RT/RTE configurations range from 34,000 to 65,000 pounds. The 40,000- and 46,000-pound versions are common in vocational applications.

What do the equalizing beams do?

They help distribute weight between the tandem axles and allow the axles to move relative to each other over uneven ground.

Does RT/RTE require suspension air pressure?

No. The steel springs mechanically support the vehicle.

Does RT/RTE use center bushings?

Yes. Depending on the model, the suspension can use high-confinement rubber or heavy-duty bronze center bushings.

Are shock absorbers available?

Yes. An optional shock-absorber package is available for applicable configurations to improve ride control.

Can RT/RTE be converted to air suspension?

Many compatible RT/RTE installations can be converted using the Hendrickson AR2 air-over-walking-beam system. Compatibility must be verified before ordering a conversion.

What causes an RT/RTE truck to sit low?

Common causes include worn, cracked, overloaded, permanently deformed, or incorrect steel spring assemblies.

Why does an RT/RTE truck dog track?

Possible causes include worn beam-end bushings, damaged torque rods, shifted axle brackets, improper alignment, or structural suspension damage.

Can an equalizing beam be welded?

Structural beams should not be welded, heated, bent, or repaired without a manufacturer-approved procedure. Damaged components generally require professional evaluation and replacement.

Is RT/RTE still suitable for vocational trucks?

Yes. Existing RT/RTE systems remain capable vocational suspensions when correctly specified and maintained, although newer rubber and air suspensions may provide lower weight or better ride quality.

Availability and Where to Find

RT and RTE suspensions are commonly found on existing vocational trucks, including dump trucks, mixers, refuse trucks, mining vehicles, crane trucks, and municipal equipment. Current factory availability varies because portions of the RT/RTE family are treated as past-generation products in some markets.

Replacement springs, bushings, equalizing beams, torque rods, brackets, hangers, shocks, and mounting hardware are available through Hendrickson distributors, commercial truck dealers, spring shops, suspension specialists, and heavy-duty parts suppliers.

Specifications and service information can be checked through Hendrickson’s official RT product page, RT/RTE specifications page, and RT/RTE steel leaf-spring maintenance manual.

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