DBH 9634 radial shaft seal — 40 x 78 x 8

DBH 9634 belongs to radial shaft seal, part of our Seals range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for 9634 and any equivalents.

The DBH 9634 is a radial shaft seal built for rotating shaft positions, where its job is to hold lubricant in the housing and keep dust, water and other particles out. It presses into a housing bore or cover, so it counts as a wear item that gets swapped out on a preventive maintenance schedule. The code breaks down as shaft 40 mm, housing bore 78 mm and height 8.00 mm, with the Lx designation pointing to a lip-and-spring design. MR Industrial Accessories supplies this brand and can help you confirm the right seal for the job.

On this seal the sealing lip is backed by a spring, which keeps contact pressure on the shaft even when alignment is not perfect. The outer case is metal, giving a firm grip once the seal is pressed into place. Together these features protect the bearings and internal parts behind the seal from lubricant loss and contamination. Reading the number is straightforward: 40 mm is the shaft, 78 mm is the housing bore, and 8.00 mm is the height.

You will find this size in gearboxes, centrifugal pumps, electric motors, compressors and transmission equipment. Plants in food processing, chemical, cement and other process industries use it, as do agricultural and road machinery operations. The 40 x 78 x 8 mm envelope shows up often on medium-power equipment, and because the seal keeps lubricant where it belongs, it plays a direct role in how long bearings and gears last.

Installation is where most seal problems start. Clean the shaft and housing and remove any burrs before you begin. Coat the lip with the same oil or grease the equipment runs, then press the seal in squarely, without hammering on the lip. A chamfer on the housing makes insertion easier. Speed, temperature and the fluid being sealed all affect selection, so check the manufacturer's data sheet for the specific operating conditions. A careful install is what keeps a leak from showing up early.

If you need an equivalent, MR Industrial Accessories can look for alternatives in other brands or series. Send the full part number, the dimensions or a photo of the original part and we will match it. We can also advise you when the mounting space is tight. Reach the team on WhatsApp or by email and you will get a prompt reply.