Timken53178-90074Two Row TDO Tapered Roller Bearing Assembly 1-3/4 in Bore x 3-3/4 in OD Double Cup Complete Set

Product Description

What this part is

A Timken 53178-90074 complete two-row tapered roller bearing assembly. Bore 1-3/4 in (44.45 mm), outside diameter 3-3/4 in (95.25 mm). The assembly comprises two 53178 cones and one 53376D double cup.

Decoding the designation

53178 — cone number, 1-3/4 in bore
-90074 — Timken assembly number, denoting a complete factory assembly rather than a component
53376D — cup number; the D suffix denotes a double cup

Assembly contents

2 x 53178 cone
1 x 53376D double cup

What these specs mean in practice

A double cup carries two raceways in one outer ring, so a single pressed-in cup serves both rows. The two cones face opposite directions, which lets the assembly take thrust in both directions and carry a moment load, and the TDO arrangement is the usual choice where a wide effective bearing spread is wanted inside one housing bore. Being a factory assembly, the setting is established by the supplied component stack rather than adjusted at fitting.

Published specifications

Bore: 1-3/4 in (44.45 mm)
Outside diameter: 3-3/4 in (95.25 mm)
Number of rows: 2
Rolling elements: tapered rollers
Configuration: TDO, tapered double outer
Cup: double cup, one outer ring with two raceways
Series: inch

Quantity and configuration

1 Set, complete assembly.

Fitting notes

The double cup presses into a single housing bore and the two cones press onto the shaft journal, one from each side. Both cones seat square against their shoulders, and the assembly runs at the setting built into the supplied stack.

Interchange guidance

A bare 53178 cone or a bare 53376D cup is a component and not an interchange for this assembly number. Other 53178-90xxx assemblies share the cone but differ in cup, spacer or setting and are related assemblies rather than interchanges.