234-3930 pin and 228-5615 sleeve show a real linkage purchase

The 234-3930 headed linkage pin has a chrome surface and a puller hole. Its nominal pin diameter is 3.54 inches and its pin length is 20.12 inches. The 228-5615 sleeve-bearing entry has a 106.2 mm outside diameter and 90 mm length.

Cat linkage examples
ComponentTechnical identityPurchase detail
234-3930 headed pinNominalØ3.54 in ×20.12 in; overall20.472 in; effective18.169 inChrome; puller hole; no internal grease passage
228-5615 straight sleeveOD106.2 mm; length90 mm; sleeve ID3.552 inCross holes for lubrication
166-1495 pin sealID89.85 mmDust-seal line
166-1487 shim2 mm thick plasticShim line

Pin working length differs from overall length

The pin body passes through the pivot ears and bearing sleeves. The head and retaining features add to the outside envelope. Record the working length between retaining features separately from the overall length, especially when comparing a headed pin with a plain shaft.

A bushing has an inside diameter, outside diameter and length

Inside diameter belongs with the pin; outside diameter belongs with the housing bore. The bushing length, cross holes and grease grooves control where it sits and how the joint is lubricated. A worn outer bore creates a different repair from replacing only the pin.

Linkage measurement drawing fields
ComponentDimensions / features
PinDiameter, body length, effective length, head and retaining hole
BushingID, OD, length, flange and grease holes
JointEar spacing, shim gap and housing bore
SealsSeal number and fitted position

List each pivot as a counted repair set

Label the bucket pivot, bucket-cylinder link and H-link pivots separately. For each location, write pin quantity, sleeve quantity, seals, shims and retaining hardware. A grease-fed bushing and a pin without an internal grease passage can belong to the same installed joint because the lubrication path is in the surrounding bearing arrangement.

Buying questions

Can two pins with the same diameter be substituted?

They can have different body lengths, retaining heads, holes and lubrication passages. Keep those features with the pivot position on the order.

Why does a bushing order need the outside diameter?

The ID fits around the pin, while the OD fits the pressed housing bore. They are separate interfaces.

What does effective length describe?

It describes the usable pin span in the connection, while overall length includes the outer head and retaining envelope.

Can seals and shims be ordered with the pin?

Yes. Count the bearing sleeves, dust seals, shims and retaining hardware for each pivot as separate lines.