Repair and Periodic Maintenance of Preet 1486B Tractor

Comprehensive structural overhaul, cutting edge replacement, and hydraulic cylinder refurbishment of the front-mounted snow clearing V-blade attachment fitted to Preet 1486B tractor. Inspection of the structural push frame, mounting subframe brackets, and central pivot hinge reveals substantial abrasive gouging, micro-cracking, and structural fatigue induced by heavy snow clearing and ice-breaking operations on high-altitude alpine highways in District Doda. The worn reversible cutting edges shall be unbolted, contact moldboard surfaces cleaned, and two sets of high-wear-resistant hardened carbon steel cutting edges conforming to IS 2062:2011 Clause 5.2 Grade E250 installed using heavy-duty Grade 8.8 countersunk plow bolts, hardened spring washers, and prevailing-torque lock nuts per IS 1367:2018 Clause 4.1. The twin double-acting hydraulic angling and lift rams shall be disassembled, cylinders internally honed, scored rods checked for run-out, and all degraded polyurethane rod seals, piston seals, double-lip wipers, and fluorocarbon O-rings renewed conforming to IS 12207:2019 Clause 5.1. Heavy-duty pivot pins and sintered phosphor-bronze bushings shall be fitted with fresh molybdenum disulphide grease lubrication per IS 11170:2018 Clause 6.2, followed by hydrostatic proof-testing of cylinders at 190 bar. Includes material supply, precision machine shop turning, coded weld repairs, workshop labor, and final alignment testing.

Complete flushing, fluid renewal, and circuit overhaul of the combined transmission and hydraulic lift system of Preet 1486B tractor. Continued high-load snow pushing operations have subjected the shared transmission and hydraulic oil to thermal breakdown, mechanical shearing, and moisture condensation, resulting in sluggish response of the three-point implement lift and auxiliary blade hydraulics. The tractor shall be operated to working temperature and the shared transmission and hydraulic casing drained completely into clean containers. The magnetic drain plugs shall be decontaminated of metallic swarf and refitted with new copper sealing washers. The system shall be charged with 50.00 litres of premium Universal Tractor Transmission Oil (UTTO) conforming to SAE 10W-30 API GL-4 and IS 10522:2019 Clause 6.1. The main hydraulic return filter and suction strainer elements conforming to IS 16889:2018 Clause 5.2 (10-micron absolute glass-fiber media, beta ratio exceeding 200) shall be renewed along with fresh Nitrile O-ring seals. Two deteriorated flexible high-pressure hydraulic hoses feeding the front lift circuit shall be replaced with two-wire steel braided rubber hoses conforming to SAE 100R2 and IS 4854:2018 Clause 4.1. Includes material supply, pressure testing to 205 bar, bleeding, and calibration.

Execution of scheduled periodic maintenance service, complete crankcase lubrication change, and dual-stage fuel and air filtration renewal on the 4-cylinder, 4087 cc direct-injection 60 HP diesel engine of Preet 1486B tractor. The engine oil shall be drained while hot, the crankcase inspected for sludge, and the sump refilled with 11.00 litres of heavy-duty multigrade diesel engine oil conforming to SAE 15W-40 API CI-4 Plus and IS 13656:2019 Clause 4.3. The full-flow spin-on oil filter element conforming to ISO 4548 shall be renewed with fresh synthetic elastomeric sealing ring. The fuel filtration circuit shall be overhauled by replacing both the primary water-separator pre-filter and the secondary fine diesel filter cartridge conforming to ISO 4020:2021 Clause 5.1, followed by fuel sediment bowl de-sludging and manual hand-primer system purging. The dual-element dry-type air cleaner assembly shall be serviced by replacing the primary outer pleated cellulose filter and inner safety poly-spun element conforming to ISO 5011:2020 Clause 6.1, including intake duct clamp tightening. The four inline fuel injector nozzles shall be bench-tested, pop-off pressures calibrated to 215 bar, and glow plugs tested for winter cold-start ignition. Includes lubricants, certified filters, workshop equipment, and diagnostic testing.

Overhaul, inspection, and component renewal of the dual-clutch drivetrain, oil-immersed multi-disc service brakes, and front steering axle hubs on Preet 1486B tractor. Extensive winter snow clearance with continuous shuttle reversing has caused severe clutch slippage, uneven pedal free-play, and friction degradation. The clutch housing shall be inspected, linkage adjusted, and the heavy-duty organic dual clutch plate lining, pressure plate diaphragm fingers, and heavy-duty throw-out thrust bearing overhauled to eliminate drive shudder. The rear oil-immersed wet multi-disc brake assemblies on both left and right planetary axle trumpets shall be dismantled and inspected conforming to IS 11852:2018 Clause 5.2; worn sintered bronze friction plates, counter reaction steel discs, return tension springs, and internal piston actuator seals shall be renewed to restore positive deceleration on icy gradients. The front 2WD steer axle kingpin spindles and wheel hubs shall be disassembled, washed in solvent, inspected for brinelling, and fitted with matched pairs of tapered roller bearings conforming to IS 7623:2019 Clause 4.2, packed with high-temperature extreme-pressure EP2 lithium grease per IS 11170:2018 Clause 6.2, and sealed with fresh triple-lip radial shaft seals. Includes precision adjustments, bearing preloading, and dynamic road braking trials.