Pinion Seals for Light Vehicles
The pinion seal closes the nose of the differential where the propshaft flange enters. It runs at propshaft speed, sees hot hypoid oil, and is the most commonly leaking seal on the whole rear axle. SES holds the range as an authorised SKF distributor, covering position Pinion shaft exit at the differential nose; lip Spring-loaded primary lip plus dust lip; materials NBR, HNBR, FKM, PTFE lip options; media Hypoid and synthetic gear oil. Executions include standard spring-loaded pinion seals, high-temperature FKM executions, PTFE-lipped seals for high speed, seal and flange repair kits. It is specified most often into light commercial vehicle rear axles and pickups and utility vehicles in plant service. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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From integrated steel plants to power utilities and EPC majors — the works that cannot afford a counterfeit part specify through SES.
Position
Differential pinion nose
Speed
Propshaft speed, higher than the wheels
Media
Hot hypoid gear oil
Risk
Bearing preload is disturbed at replacement
Where it runs.
You will find Pinion Seals for Light Vehicles in the parts of a plant where this particular duty actually occurs. In practice that means light commercial vehicle rear axles, pickups and utility vehicles in plant service, passenger vehicle differentials in workshops, and equally light 4x4 transfer case output flanges, small trailer drive axles, utility vehicle front differentials. What links them is the duty rather than the machine name — position: Differential pinion nose. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. The pinion nut has to come off to fit the seal — Mark the nut and shaft positions and record the turning torque first. Guessing the preload afterwards ruins a pinion bearing in a few thousand kilometres. The flange sealing surface is grooved or corroded — A new flange or a repair sleeve. A pinion seal cannot bridge a groove because it runs too fast to let the oil settle. The axle uses a crush sleeve for preload — A new crush sleeve if the nut is loosened at all. Re-crushing the old one gives a preload that is never repeatable. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Seat the seal to the housing shoulder using a driver of the right diameter, then check the lip is square before refitting the flange. Driven in a few tenths too deep, it sits against the bearing and the oil path back to the sump is blocked.