Side frames are non-destructively tested (NDT) – magnetic particle inspection (MPI) at truss junctions.
All rubber bushes (which have a finite life of 12-18 months) are replaced.
Axle boxes are opened, old grease cleaned, and fresh grease packed (approx. 1.2 kg per box).
Complete dismantling of the bogie into individual components.
Ultrasonic testing (UT) of axles and dynamic wheelset balancing.
Replacement of all coil springs (they work-harden and lose free height).
Re-profiling of center pivot and bolster bowl using a jig.
Full Title (likely):Technical Pamphlet for Overhauling / Maintenance of Air Brake System Equipment on Indian Railways (or similar – exact title may vary by revision).
Purpose: Specifies procedures, schedules, tolerances, and tests for the periodic overhaul (POH) or workshop-level maintenance of air brake components (e.g., DV-10/DV-14 distributors, brake cylinders, auxiliary reservoirs, control valves).
Applicability: All Indian Railways workshops, POH depots, and freight/maintenance depots handling air-braked rolling stock (wagons, coaches, locomotives).
Required forms/checklists for each inspection and repair stage.
Traceability: component history, serial numbers, repairs performed, personnel initials.