S.N. Activities Clause No.
Obsertations
Bottom hub, pulling lug top & bottom,
top & bottom pin protectors.
45 Repair of cracks or sections broken out 5.2.2 (G80) No repair is done.
at any location is prohibited.
46 Restoration for wear of the lock is 5.3.1 (G80) Not done.
done only on the knuckle engagement 5.3.2(G80)
surface. Repair of cracks or sections
broken out at any location is prohibited.
47 The restoration by welding is done as 5.3.3(G80) -do-
specified.
48 The knuckle pivot pin is reconditioned as 5.4(G80) No recondition is done.
per the procedure specified.
49 Ensure that the coupler yoke are 5.5(G80) -do-
reconditioned only when within the
specified limits otherwise scrapped. The
repair is done as per the specified
procedure.
50 Ensure that the high capacity draft gear As per G-80 Being followed.
are maintained and reclaimed as per the &
instructions circulated by M/s Bhartia Chapter 9 of
for Cardwoll Mark 50 Design & by M/s Maintenance
Burns Standards for Miners RF-361 and Manual for Wagon.
as laid down in Chapter 9 of
Maintenance Manual for Wagons.
51 The standard draft gears are to be Para 919 of Maint. -do-
replaced by high capacity draft gears Manual for wagon
vide RB’s letter No.84/M(N)/
172/3 dtd.5-7-90 and new freight stocks
would be fitted with high capaciity draft
gear i.e. RF-361 & MK-50.
52 Maintenance of RF-361 Draft gear Para 920 of Maint.
Manual for wagon
53 All gauges for housing, gauges for shoes, -do- Yes available.
gasuges for wedge and final inspection
gauges as specified are available.
53.1 The RF361 draft gear will require -do- Rear wall plate is cut by gas
complete reconditioning i.e., removal cutting, no bend saw machine.
and replacement of the rear wall plate
only if the gear has loosed clutch
components (shoe & wedge), a broken
housing or cracked weld at the rear wall.
If loose clutch, broken housing or a
cracked weld are not present then only
removal and replacememnt of clutch
component is necessary. Normally,
clutch disassembly and replacement is
the only reconditioning needed in the RF
361 draft gear.
S.N. Activities Clause No. Obsertations
53.2 If either the shoes or wedge are broken Para 920 of Maint. Followed 100% reconditioning is
and the and the clutch is not loose, Manual for wagon done.
RF361 draft gear is dismantled as per
laid down procedure in para 920C(b)
and necessary equipments are available
for this purpose.
53.3 Shoes are inspected for these defects – -do- Check by visual & gauges
No concave wear or any Being followed
friction surface Being followed
No cracks or spalls
No wear more than
0.8mm on any friction
surface
53.4 Wedge is inspected for these defects – -do- Inspected
No crack or spall of the
carborized case on the friction
face or the top of the wedge
No wear more than 0.8mm or
1/32” on the friction surface.
No indication of broken or any
cracks on any of the locking lugs.
53.5 Housing or cylinders are examined as -do- Examined and scrapped if found
per laid down procedure and scrapped if unsuitable.
found unsuitable.
53.6 For proper function, every part of the -do- Followed.
assembly must be free of oil, grease and
moisture. The part should be kept
properly during storage, handling and
reassembling.
53.7 Wedge and shoes asre to be shot -do- No shot peened is done, cleaning
peenerd to remove rust and dirt before is done by wire brush.
assembly.
53.8 Re-assembly of draft gear is being done -do- Followed
as per laid down procedure.
53.9 If complete reconditioning of the gear is -do- Followed by no static test is
required either because of a loose clutch done.
or a broken weld, then procedure as laid
down in para 290(D) are followed.
Rubber pads are inspected as per laid
down procedure and static test is
performed.
53.10 All components such as internal -do- Followed.
followers, forged items, housing
(cylinders )are inspected as per laid
down procedure.
53.11 Re-assembly of reconditioned RF-361 -do- Tools and fixtures are available.
draft gear is done as specified and tools
such as 50 tons vertical press and draft
gear assembly ring support fixture are
available for assembly purpose
S.N. Activities Clause No. Obsertations
53.12 Reconditioned draft gear RF361 is -do- Being followed.
inspected as specified
53.13 Welding of rare plate after assembly is -do- Followed by only CO2 welding.
done as specified in the manual. MIG
welding (with 100% CO2 shielding gas) is
use for piller pass welding and MIG
welding (with 75% urban and 25% CO2)
is use for root run welding.
53.14 The assembled RF361 draft gear must be -do- Followed
preshortened facilitate installations into
the yoke and draft pocket. After pre-
shortening the external surface of the
draft gear is to be painted with balck or
blue paints.
54 Maintenance of Mark – 50 Draft Gear Para 91 of
Maintenance
Manual for Wagon
54.1 Inspection of MK-50 Draft gear is done -do- Followed.
for reconditioning through a built in
wear life gauge as per laid down
procedure.
54.2 While removing the draft gear from the -do- Suitable lifting/lowering jack is
wagon pocket, it is necessary to available and shortened by cross
compress the draft gear approximately key.
(1/4”). Suitable lifting/lowering jack is
available for removal of draft gear from
wagon pocket.
54.3 For removal of stuck or damaged draft -do- Followed.
gear, laid down procedures and
precautions are followed.
54.4 For dismantling of MK-50 draft gear, -do- Followed.
tools and gadgets are available and
procedures as specified as follows.
54.5 All gauges as per annexure are available -do- Yes, available.
for maintenance/ reconditioning of MK-
50 draft gear.
