The document provides the procedure for performing a Routine Over-Haul (ROH) of an air brake wagon with a Casnub bogie. The summary is: 1) The wagon body is lifted and bogies are run out for examination and repair of components like springs, frames, and pivots. 2) Brake gear levers and rods are stripped for examination of worn parts. 3) A thorough examination and maintenance of the air brake system is conducted according to manufacturer manuals, including cleaning, lubrication, leakage checks, and single car testing. 4) Additional tasks include cleaning and lubricating hand brakes, examining head stocks, refitting brake gear, replacing worn brake

1. Wagon ROH
procedure

2. ROH OF AIR BRAKE WAGON WITH CASNUB BOGIE
Wagon stock should be given Routine Over-Haul (ROH) at the nominated sick
line/wagon depots, where proper facilities are provided. The ROH schedule is as follows:
a) Lift the body, keep it on trestles and run out bogies.
b) Strip bogie component for examination and repair as below:
• Strip spring & spring suspension arrangement including snubbing device. Check
springs for free height and other defects. Replace where required.
• Examine Bogie frame. Check frame alignment as per instructions contained in RDSO
Technical Pamphlet No. G-95.
• Examine pivot for welding defects/cracks/abnormal depth due to wear. Replace where
necessary and lubricate with graphite flakes to IS:495 in dry condition.

3. c) Strip brake gear levers and rods for examination of worn out/damaged parts.
d) The equipment shall be given attention in accordance with the maintenance
manual issued by respective air brake equipment manufacturer and RDSO technical
pamphlet no. G-97.
i. Cleaning of strainer discs (Reference 6 & 218 of the pamphlet SBA 795/258 of P4aG
type Distributor Valve)
ii. Lubrication of brake cylinder/cleaning of its strainer
iii. Check for easy operation of isolating cock & anti-pilferage device of distributor valve
cut-off angle cock, manual quick release valve & isolating cock.
iv. Draining of Auxiliary Reservoir
v. Checking of hose coupling for serviceability

4. vi. Cleaning of strainer
vii. Dirt collector to be cleaned
viii. Leakage in pipes and joints to be checked
ix. After carrying out above items of work the wagon shall be tested
for proper function of air brake system with single car test device in
accordance with the procedure indicated below:

5. • Connect the BP coupling of single car test rig to the corresponding coupling of the
wagon to be tested. The couplings of the other end of the wagon to be closed with
dummy coupling heads. Fix pressure gauge on the brake cylinder.
• The single car test device should now be coupled to the main line of a compressor
through a pipe.
• Carry out the preparation and testing in accordance with the procedure given in the
manufacturers Maintenance Manual and record the reading in the test proforma.
• For passing the wagon, all the parameters shall be within specified limits.

6. e. Clean horizontal lever, hand brake & gears and lubricate.
f. Examine head stock for damage, bent/cracks.
g. Refit brake gear levers and rods, lubricate pins and other equipment and apply
graphite to horizontal levers of empty load box
h. Replace worn out brake blocks.
i. Check wheel profile, turn the wheels. UST of Axle to be carried out & turning of
wheel to worn wheel profile during ROH be done.
j. All the wheels are to be checked ultrasonically & ensure stamping as per
Annexure IV and End Axle cap bolts are to be tightened up by torque wrench with
proper torque (40 kg-m) and in no case old locking plates are to be reused.

7. k. CBC Knuckles and coupler body are to be checked by contour gauge as per
Technical Pamphlet no. G-76. Anti creep/ articulated rotary operation of locking
arrangement to be checked.
l. Manual adjustment of brake gear to be done in accordance with wheel
diameter. Setting of Empty load device and A & E dimension of SAB shall also be
done before SWTR test.
m. Modification work are to be attended as issued by RDSO from time to time.
n. CTRB of wheel should not be overdue POH schedule.

8. THANK
YOU