| Also known as | T4548 |
| Diagram | Fig. 10 — GEARS — SHAFTS — SELECTORS — STARTING MECHANISM · ref 55 |
| Subsystem | gearbox |
| Listed in parts books | 1973 |
LAYSHAFT
Gearbox layshaft (PN 57-4548, formerly T4548) from the GEARBOX SHAFTS AND GEARS section.
This is the layshaft out of the gearbox, listed in the parts books under GEARS - SHAFTS - SELECTORS - STARTING MECHANISM and GEARBOX SHAFTS AND GEARS. In the older parts-book system it's numbered T4548, same physical piece as 57-4548 in the current numbering.
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The layshaft is one of the two main shafts inside the gearbox, riding parallel to the mainshaft and carrying its own set of gears that mesh with the mainshaft gears to give you your ratios. If you're in there for a rebuild or chasing a gear-selection problem, this is a part worth inspecting closely for wear on the bearing journals and gear splines.
Our catalog record ties this one to 1973 appearances and doesn't spell out which specific model it belongs to beyond that, so check it against what's actually in your gearbox before you order.
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