TTPS Operation Circle MPM I Unit I Overhauling of Mill gear box under bowl Separator top assembly etc of Mills 1A and 1F during the forthcoming overhaul

Draining of Mill gearbox oil completely, cleaning the gearbox internals like worm shaft and worms wheel. After inspection, filling the gearbox with old/new oil including devolution of old oil from site to stores etc.

Charges for dismantling of lube oil cooler, from lube oil system, cleaning, flushing the cooler, oil pipe lines,water pipe lines, oil separator tank, checking of water lines, valves and nipples, replacement of worn out parts, reassembling the same as per the direction of engineer-in-charge.

Charges for providing wedges between lower skirt and Mill insulation cover plate firmly, removal of gearbox bottom cover flange bolts, lowering the thrust bearing and pump housing after supporting lower radial bearing housing. Lowering the thrust bearings and reassembling of all the above parts, providing SS shims at the bottom cover flange. Blue matching the worm shaft and worm wheel engagement till we get 20 to 50% pattern by trial method releasing/ providing thin SS shim sheet at the bottom cover flange and to get proper running clearance and centering of engagement.

Charges for dismantling and removing worn out thrust bearing of Mill vertical shaft by gas heating the racer, cleaning the bearing seating area in the vertical shaft and assembling back new thrust bearing after heating the racer in oil bath.

Charges for Renewal of thrust bearing adopter by oil heating and using necessary fixture for assembling the adopter in correct position after positioning the shims below the worm gear hub lock nut. Removing the thrust bearing adopter (worn out) and assembling the new adopter by heating.

Charges for Dismantling of upper skirt assembly, lower skirt assembly, Mechanical face seal assembly, dust guard and blue matching of seal runner, renewal of seal( bronze), air seal, dismantling of Mill bottom cover, upper bearing housing cover, oil seals etc., Complete overhauling, assembling back the lower skirt assembly, scrapper assembly and arresting the oil leakages in the return line and also spillage’s at the rear side of gearbox to prevent Mill fire including cleaning and tapping the threaded holes.

Charges for dismantling the gear coupling bolts, gear coupling (worm shaft only), distance piece, unscrewing the worm shaft extension cover bolts and bearing housing cover bolts, removing the worm shaft extension cover, lowering to ground floor, releasing the worm shaft assembly from its position and assemblies providing back the overhauled worm shaft assembly in the gear box and fitting back the worm shaft extension cover, bolting and tightening the bolts to the required torque level and assembling back the gear coupling bolts, distance piece etc.

Charges for checking the bearing clearance after dismantling the thrust bearing and radial bearing housing covers, removing the bushes, springs etc. thoroughly cleaning the bearing housings and other components inspecting the thrust bearings, resetting the axial clearance by reducing the thickness of shims in the thrust bearing housing cover, providing of new shims and by trial method adjusting the clearance to 0.10 mm to 0.15 mm. Assembling back the thrust and radial bearing housing properly and renewing the gland studs and gland packing in the worm shaft assembly.

Charges for changing the worm shaft thrust bearing after gas heating and releasing the old bearings from the worm shaft, heating the new bearing in oil bath and providing the new bearing in the worm shaft in proper position.

Charges for renewing radial bearing in the worm shaft after gas heating and releasing the old bearing and providing new bearing in the worm shaft after heating the bearing in oil bath.