PRODUCT FAMILY
©2009 AxleTech International


HYDRAULIC WET DISC BRAKES


PRODUCT SUMMARY

AxleTech International.s wet disc brake designs offer durable, dependable braking under a variety of off-road conditions. These brakes are performance-proven under the most severe operating conditions and can be adapted to your specific requirements to help ensure minimum vehicle downtime and maximum productive operating time. Our Dura-Disc® wet disc brakes are developed withsealed-in components to provide long service life, reduced maintenance costs and improved vehicle safety in severe operating conditions. Sump or forced cooling options are available and, with hydraulic actuation, these brakes experience virtually no in-stop fade. In addition, an optional mechanical wear indicator feature is available for most applications. This offers vehicle operators a quick and easy method to audit wet disc brake friction plate wear without either expensive vehicle downtime or actual axle/brake disassembly that might cause expensive unnecessary costs. Another feature option on some wet disc brake models are the jack screw feature that permits wet disc brakes to use less actuation fluid volumes by presetting the wet disc brake piston position. Strong piston return spring assemblies are standard in each wheel speed wet disc brake assembly to assist in the service piston position return and minimize any possible piston .drag. which might cause extra heat/potential wear in the wet brake cavity. Temperature sensor port provides OEM the capability to monitor the oil temperature in the wet disc brake assembly to provide awareness of heat generated in vocational duty cycle to provide an early warning to end user should brake temperatures rise above approved levels.

Spring Applied/Hydraulic Release Brakes:

AxleTech International's Spring Applied/Hydraulic Release wet disc brakes provide the ultimate solution for service, parking, and emergency braking coupled with all the benefits of the Dura-Disc® brake. They eliminate the need for a driveline brake by combining service, parking, and emergency braking into a single, easily controlled wheel end system.

AxleTech International.s wet disc brakes have been in the most severe and diverse vocational usages ranging from; but not limited to: Lift Trucks, Container Handlers, Reach Stackers, both Rigid and Articulated Haulers, Log Loaders, Locomotive (Mining & Tunneling), Compactors, Rollers, Underground Mining and Exploration, Front End Loaders, Agricultural Spreaders, and Asphalt Pavers. Some of these wet disc brake applications are supported by unit mount brakes as well as integral to the current axle product range.

 

 

FEATURES
BENEFITS
Sealed brake components Longer life; safer operation; maximizes performance; minimizes maintenance; reduces vehicle downtime for brake
maintenance versus other brake options
Sealed oil bath Keeps lubricant in and contaminants out; Reduces parts wear; reduces maintenance
Sump cooling system Dissipates heat through fluid to brake housing
Optional forced cooling system ports Provides access to brake for supplemental cooling oil
externally from vehicle.s hydraulic system for more
severe vocational duty cycles
Hydraulic Actuation or Spring Applied/Hydraulic Release Provides immediate, uniform braking response
Multiple friction discs possible in each brake assembly Provides ability to optimize vehicle braking within each approved brake assembly
Multiple piston return springs standard Minimizes potential for piston .drag. against friction plate stack
Jack screws optional on some models Minimizes actuation fluid capacity/time to actuate brake in each cycle
Optional temperature sensor port on some models Provides ability to monitor oil temperature in brakes
Mechanical wear indicator optional on some models Provides ability to monitor any potential wear externally on brake assembly



SIZE
Inches (mm)
MODEL MAXIMUM
NUMBER OF
FRICTION
PLATES
MAXIMUM RATED
BRAKE TORQUE
Pounds-In
(N m)
(1)
NOMINAL
ACTUATION
PRESSURE
psi (BAR)
COOLING
SUMP
FORCED
(3)
MINIMUM
WHEEL
Inches
(mm)
(4)
BRAKE
FUNCTION(S)
BRAKE
TYPE
9" (229) W2H 10 120,000
(13,560)(1)
1,500 (103) S,F n/a serv / sec Shaft Speed
13" (330) W3H 6 175,000
(19,775)
1,500 (103) S,F 20 (508) serv / sec Wheel Speed
14.2" (360) W3H 6 375,000
(42,375)
1,800 (124) S,F 20 (508) serv / sec Wheel Speed
17" (432) W4H 10 598,000
(67,574)
1,500 (103) S,F 24 (610) serv / sec Wheel Speed
9" (229) W2M 6 59,000
(6,667)(1)
350 (24) (5) S n/a emer / park Shaft Speed, Spring Applied Hydraulic Release
17" (432) W4M 6 357,000
(40,341)
1,350 (93) (5) S,F 24 (610) serv / sec / park Wheel Speed, Spring Applied Hydraulic Release
13" (330) WDH330 6 175,000
(19,775) 
1,500 (103) S,F  20 (508)  serv / sec Wheel Speed 
17" (432 WDH432 10 598,000
(67,574) 
1,500 (103) S,F  24 (610)  serv / sec Wheel Speed 
17" (432 WDM432 6 357,000
(40,341) 
1,350 (93) (1) S,F  24 (610)  serv / sec / park  Wheel Speed, Spring Applied Hydraulic Release 
Note: Engineering approval required on each wet disc brake installation.
(1) Multiply by wheel end rationto get torque at wheel.
(2) Reference only; alternate pressures may be approved.
(3) Depends on specific wheel rim being used.
(4) Services / secondary; provides secondary function if vehicle system is set up.
(5) Hold off pressure for Spring Applied Hydraulic Release brakes.