To dismantle and assemble the steering gear box.
Given gear box assembly, jack, set of spanners, hammer, slims, pliers, screw drivers, tool kit, gear oil, kerosene, cotton waste etc.
Dismantling
Assembling
Working of master cylinder
By pressing the pedal the push rod pushes the piston. When the piston moves forward it closes the by-pass port 'C'.Now the brake fluid in the cylinder is pushed forward and it moves with pressure with pressure valve “B”and reaches all the wheel cylinders through pipes. The wheel cylinder receives the brake oil with pressure and expands the brake shoes against brake drums.
When the pressure on the pedal is removed, the spring in the cylinder pushes back the piston and by suction the brake oil in the line is pushed back in the cylinder. The oil come back through the bypass port “c” when gets opened with the backward stroke of the piston. This way the oil which was forced to wheel cylinders returns back in the reservoir of the master cylinder and again it is ready for braking operation. The push rod which pushes the piston the piston can be adjusted. There must be some play or clearance between bush rod and piston. It keeps in operation the by pass by the primary washer and thrust releasing the pressure. The secondary washer checks the leakage of oil from the piston grooves and the cylinder At the top of the supply tank a filler cap is provided with a vent hole in it. It is vented to the atmosphere because atmospheric causes the flow through the filter part.
Brake Pipes and Hoses
Brake pipes are made of special material which can stand the high pressure that exists when the brakes are applied. Generally steel pipes are used between master cylinder and the frame connection and the rear axle T fitting and rear wheel cylinders. Flexible hose connect the brake pipe to the front wheel cylinder and to the rear axle fitting.
Wheel Cylinder
Hydraulic pressure from master cylinder forces the piston apart. Then the brake shoe actuating pins force the brake-shoes into contact with the brake drum. A bleeder valve is also provided in wheel cylinder to allow the air and liquid to be forced out of the system during the bleeding operation. The piston cups are so formed that the hydraulic pressure forced them tightly against cylinder wall of the wheel cylinder.
Brake Drum
There are generally made of cast iron pressed steel or cast iron and steel. The brake drums are cylindrical members closed from one side and open on the other to house the brake shoe. The drum and wheel rotate together. Cooling ribs or fins are provided around the brake drum rabidly.
Brake Shoes
Generally there are two shoes a primary and secondary. Shoe is made of cast steel or forged steel. The cross section is generally T. Brake lining is fixed on the shoes with the help of rivets. One end of the shoe is fixed in the wheel cylinder and other end is coupled with adjuster Return spring are also fitted on the end.
Brake Lining
Brake lining is of two types, molded or woven Is made o specially treated asbestos or other heat and wear of the brake shoes. This lining comes directly in contact with the brake drum to provide braking action. Bonded lining are fixed on the shoe with an adhesive and then backed.
Thus the dismantling and assembling of steering gear box and brake system have been performed.
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