CAN CSA M424.3-M90:2016 pdf download.Braking Performance - Rubber-Tired,Self-Propelled Underground Mining Machines
1.1 CAN CSA M424.3-M90 describes minimum performance criteria for the service braking system,secondary braking system, and parking system for rubber-tired, self-propelled underground mining machines with maximum rated speeds of 32 kph or less and having a rated gross mass of 45 000 kg or less.
1.2 In this Standard,“shall" indicates a mandatory requirement;“should" indicates a recommendation, or that which is advised but not mandatory. Notes accompanying clauses do not include mandatory or alternative requirements. The purpose of a note accompanying a clause is to separate from the text explanatory or informative material that is not properly a part of the Standard. Notes to figures and tables are considered to be part of the figure or table and are written as mandatory requirements.
4.1.1 The maximum allowable force to actuate the braking systems shall be 700 N for a foot-operated system and 400 N for a hand-operated system.
Note: Some regulatory authorities may require the brake(s) to be automaticaily applied if the engine stops or upon the loss of hydrodynamic/transmission pressure, where applicable.
4.1.2 The braking systems may use common components. However, a failure of a common component shall not reduce the effectiveness of the machines stopping capability below the secondary braking performance.
4.2.2 System Recovery
With the machine Stationary, the primary power source of the service braking system shall have the capability of delivering at least 70% of maximum brake pressure measured at the brakes when the brakes are fully applied 20 times at the rate of six applications per minute with engine at high idle.
4.2.3 Warning Device
Service braking systems using stored energy shall be equipped with a warning device that actuates before system energy drops below 50% of the manufacturer's specified maximum energy level, or before the energy level required to meet the secondary braking system stopping distances specified in Table 1 is reached, whichever is greater. The device shall be readily visible and/or audible to the operator and provide a continuous warning. Gauges indicating pressure or vacuum shall not be acceptable to meet these requirements.
4.4.2 System Application
The parking system shall be capable of being applied by a person sitting in the operator's seat.The system shall be arranged so that it cannot be released from the operator's seat after any application unless immediate reapplication can be made from the operator's seat.
4.4.3 System While Applied
The parking system while applied shall maintain the parking performance in compliance with Clause 4.4.1 despite any contraction of the brake parts, exhaustion of the source of energy, or leakage of any kind.CAN CSA M424.3-M90 pdf download.