SAE J1026-2000 pdf download Brake Pertormance—Crawler Tractors and Crawler Loaders
Scope-This SAE Standard applies to crawler tractors and crawler loaders as identified in SAE J1057 andSAE J1116 and having a manufacturer’s maximum specified speed of 16 km/h.
Purpose–To provide performance criteria for service brake systems, secondary brake systems, and parkingbrake systems for crawler tractors and crawler loaders.
References
Applicable Publications–The following publications form a part of the specification to the extent specifiedherein. Unless otherwise indicated, the latest revision of SAE publications shall apply.
SAE PUBLICATIONS-Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.2.1.1
SAEJ727-Nomenclature-Crawler TractorSAEJ732-Specification Definitions-LoadersSAEJ742-Capacity Rating-Loader BucketSAE J818-Rated Operating Load for LoadersSAE J1057-dentification Terminology of Earthmoving MachinesSAE J1116-Categories of Off-Road Self-Propelled Work Machines
Definitions
Crawler Tractor–Crawler tractor is defined in SAE J1057 and is illustrated with parts nomenclature in SAEJ727. The tractor may, in addition, have any combination of attachments mounted on it that are formallyapproved by the machine manufacturer.
Crawler Loader–Crawler loader is defined in SAE J1057 and SAE J732. The loader may have any type ofbucket or other tool, and any other combination of mounted attachments that are formally approved by themachine manufacturer.
3.3Brake Systems-All the components which participate in stopping and holding the machine. Such systemsconsist of a control, means of power transmission, and the brake itself.
3.3.1SERVICE BRAKE SYSTEM–The primary system used for stopping and holding the machine.
3,3.2SECONDARY BRAKE SYSEM–The system used for stopping the machine in the event of any single failure inthe service brake system.
3.3.3PARKING BRAKE SYSTEM–The system used to hold a stopped machine in a stationary position.
COMMON COMPONENT–A component that performs a function in two or more brake systems.3.3.4
3.4Brake(s)-The component which directly applies a force to oppose movement of the machine. Brakes may, forexample, be friction, electrical, or fluid types.
Slide–Slide, as used in this criterion, is defined as no track rotation during machine movement.35
3.6 Machine Mass-Crawler Tractor–Operating mass of the machine up to the mass of the heaviestcombination of equipment approved by the manufacturer of the machine, an operator of 75 kg, and with themachine fully fueled and serviced.
3.7Machine Mass–Crawler Loader-Operating mass of the machine up to the mass of the heaviestcombination of equipment approved by the manufacturer of the machine, a loaded bucket per SAE J742 not toexceed rated load as defined in SAE J818, an operator of 75 kg, and with the machine fully fueled andserviced.
3.8Brake Force–Decelerating force due to the brake system, plus rolling resistance, but it does not includeengine torque.
Brake System Performance
Common Component–The brake system may use common components. However, a failure of any singlecomponent, or a failure of any single common component, shall not reduce the effectiveness of the machine’sstopping capability to less than the secondary stopping performance, as defined in 4.3.1
Service Brake System–The machine shall have a service brake system.
4.2.1 BRAKE PERFORMANCE-The service brake system is tested by towing. The service brake system when fullyapplied on a machine moving in ither forward or reverse shall cause the tracks to slide or develop a brakeforce in Newtons equal to 9.8 times the operating mass in kilograms.
Secondary Brake System-The machine shall have a secondary brake system capable of being applied by aperson seated in the operator’s seat, It also may be applied automatically.