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Read articles →An owner walking through his own 100-hour service on a 2025 Mahindra 1635 HST cab model after completing it. Covers which bolts to loosen and their sizes (19mm, 14mm, 3/4-inch), two hydraulic/transmission filters with part numbers, fluid choices (Mahindra Universal 3 synthetic, Shell Rotella 15W40), and the roughly 9-gallon capacity. A practical quick-reference for 1635 HST owners facing their first fluid service.
An owner-operator sharing post-job impressions from his own property, with follow-up videos on fuel filters and front axle fluid planned.
You need a 19 millimeter for the middle bolt, 14 millimeter for the side bolts near the tires, and a 3/4 inch for the one underneath the rail.
Mahindra Universal 3 synthetic tractor hydraulic fluid for the transmission and hydraulic system, and Shell Rotella 15W40 full synthetic for the oil.
It takes about 9 gallons, according to the owner performing the service.
The owner put a clamp on the bigger filter and tapped it sideways, which got it off when it was tough to remove by hand.
