Brake bench

4.4 Operating and Maintenance Requirements

4.4.1 Preparation for operation

Connect the 3-phase supply voltage to the input switch.

Before work to replace in the motor - reducers deaf jellied traffic jams with traffic jams with openings (sapun). Check presence of oil in motor-reducers and presence of lubricant in roller bearings housings. Fill with appropriate lubricant if necessary.

Set the general circuit breaker to the ON position. Turn on the stand. Then turn on your computer. The main menu of the program that controls the operation of the stand appears on the monitor screen. Select "Auxiliary programs" item from the main menu and "equipment check" submode. Check the equipment.

To perform a comprehensive check, prepare a serviceable car with a serviceable braking system, with an axle load of not more than 3500 kg. Perform a full diagnosis of the braking system of the car. The correct functioning of all sensors and programs is indicated by the absence of error messages displayed on the monitor screen.

4.4.2 Bench operation procedure

Operation on the stand is performed by commands on the monitor, traffic light or information board screen.

The procedure for working with the bench is as follows:

- switch on the control rack;

- Turn on your personal computer. Load brake bench control program;

- select the required mode of operation in the main menu;

- select the vehicle to be diagnosed from the database or enter a new one;

- select automatic or manual diagnostic mode;

- attach force sensor on TS brake pedal;

- dry brake shoes and drums in "Dry" submode. To do this, on command on the screen of the monitor, traffic light or information board "Enter" stop at the roller installation. Then press the brake pedal by command "Smooth brakes." The drying process lasts about 20 s or until slipping by one of the wheels;

- measure maximum braking forces, coefficient of non-uniformity of wheel braking forces and force on the control in "Full load" submode. On command "Brake smoothly," press the brake pedal;

- measure the resistance to rotation of non-braking wheels and determine the ovality coefficient in the "Partial load" submode. After rotation of rollers starts for 4 sec, resistance to rotation of non-braking wheels is measured. The brake pedal must remain released. Then press the brake pedal on "Smooth brakes" command until "Hold" command appears. On this command, hold the brake pedal in the unchanged position until the "Release" command is issued, after which the pedal is smoothly released. After the "Hold" command is issued, within 8 s, a data set is performed to calculate the ovality coefficient at incomplete load of the braking system;

- measure maximum braking forces generated by parking system and forces on control unit in "Parking" submode. To do this, use the "Smooth brakes" command to actuate the parking braking system, acting on the control (lever or pedal) through the force sensor. If the vehicle has a manual control valve for the parking braking system drive, it is allowed to actuate the parking system without using a force sensor;

- on "Leave" command, check out the diagnosed axle from the roller unit.

On this, the diagnosis of the axis ends, the diagnosis of subsequent axes is carried out in the same way.

4.4.3 Maintenance Rules

Maintenance of the stand is divided into daily and periodic.

Daily maintenance of the bench shall be performed during its operation. It includes such works as keeping the bench clean and checking the fixtures of the controls, the reliability of connecting the connectors.

Periodic maintenance mainly consists in maintenance of the roller unit.

The main operations carried out during periodic maintenance are:

- lubrication of the chain of support rollers is performed 1 times a month;

- oil replacement in the motor - gearboxes shall be performed once a year or every 500750 hours of operation;

- once every six months replacement of lubricant in roller bearing supports;

- adjust the amount of drive run-out as required;

- adjust the axial clearance in the bearings of the intermediate drive shaft as necessary;

- check the oil level in the actuator once a month.

It is also necessary to carry out preventive work, which is carried out during the annual inspection of the technical condition. At the same time, the condition of paint and varnish, galvanic coatings, attachment of parts and assembly units, locking of fastening joints, reliability of packs and contact joints, absence of chips and cracks on parts made of insulating material are visually checked. Places subjected to corrosion should be cleaned and covered with enamel (lacquer) and grease (if necessary). During visual inspection, it is recommended to check the completeness of the bench and the condition of the accessories. Accumulation of dust inside the power cabinet and dirt on the surface of moving mechanical parts of the roller unit can cause overheating and damage to the elements. Dust removal shall be performed by dry air blowing. Outside, dust and dirt are removed with a soft rag and brush. The surfaces of the keyboard and monitor should be cleaned with a tampon wetted with 40% ethyl alcohol solution. The contaminated surface of the structural elements of the bench can be cleaned with a soft cloth moistened with water with synthetic washing powder dissolved in it.