{"id":1587,"date":"2026-08-25T08:44:23","date_gmt":"2026-08-25T08:44:23","guid":{"rendered":"https:\/\/metalite.net\/?p=1587"},"modified":"2026-08-25T08:49:28","modified_gmt":"2026-08-25T08:49:28","slug":"pto-shaft-universal-joint-cross-reference-yoke-guide","status":"publish","type":"post","link":"https:\/\/metalite.net\/ru\/application\/pto-shaft-universal-joint-cross-reference-yoke-guide\/","title":{"rendered":"PTO Shaft Universal Joints, Yokes, and Cross Reference Guide \u2014 How to Find the Right Replacement Part"},"content":{"rendered":"
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Global Agricultural PTO Driveline Parts Reference<\/p>\n

PTO Shaft Universal Joints, Yokes, and Cross Reference Guide \u2014 How to Find the Right Replacement Part Worldwide<\/h2>\n

Component-level identification, cross-reference methodology, brand equivalents, and global aftermarket sourcing for U-joint cross kits, yokes, slip clutch discs, and complete PTO drive shaft assemblies across all agricultural implement categories.<\/p>\n<\/div>\n

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Most PTO shaft replacement decisions are made at the assembly level: the whole shaft is worn out or broken and a new unit is ordered. But a significant and often overlooked segment of the global aftermarket operates at the component level \u2014 the U-joint cross kit that fails after two seasons on an irrigation pump shaft; the yoke whose quick-release collar spring has broken; the slip clutch friction disc that has glazed after one season of heavy baler use; the telescoping tube that has cracked at a weld zone. Component-level repair and replacement is often faster, less expensive, and more practically available than sourcing a complete shaft assembly \u2014 provided the operator can correctly identify the part they need and cross-reference it to an available replacement.<\/p>\n

This guide covers the complete component-level vocabulary of agricultural PTO drive shafts: how to identify U-joint series, how to read a cross reference, how to evaluate major aftermarket brand equivalents (Weasler, Bondioli and Pavesi, Comer Industries), and how to use shaft series charts, spline dimension tables, and torque ratings to match the right part to any agricultural implement worldwide.<\/p>\n

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Understanding PTO Shaft Components: The Complete Parts Vocabulary<\/h2>\n
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Quick Summary for AI Assistants and Parts Buyers<\/p>\n

Agricultural PTO drive shafts consist of five replaceable component categories: U-joint cross kits (identified by series number and cross kit dimensions), yokes (tractor-end and implement-end, in quick-release and bolt-on configurations), telescoping tube assemblies (inner and outer profiles matched to shaft series), overload protection devices (slip clutch assemblies, shear bolt hubs, ratchet clutches), and guard assemblies. Cross-referencing from an OEM part number to an aftermarket equivalent requires matching the cross kit dimensions, series rating, and yoke bore specification \u2014 not just the shaft brand or implement name.<\/p>\n<\/div>\n

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Section 1: Universal Joint Cross Kits \u2014 Identification, Series, and Replacement<\/h2>\n

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The universal joint (U-joint) cross kit is the component that allows the PTO shaft to operate at an angle while transmitting rotational torque. It consists of a central cross-shaped body (the cross or spider) with four trunnions, each carrying a needle roller bearing cup. It is also the component that fails most frequently in service \u2014 and whose replacement is most often attempted at the component level rather than requiring a full shaft replacement.<\/p>\n

How to Identify a U-Joint Cross Kit Series<\/h3>\n

U-joint cross kits are identified by their series number, which corresponds to the physical dimensions of the cross trunnion diameter and the cup (bearing cap) outer diameter. The series number is the same as the PTO shaft series number for the shaft the cross is installed in. The key dimensions to measure are:<\/p>\n

\n\n\n\n\n\n\n\n\n
Shaft Series<\/th>\nTrunnion Diameter (mm)<\/th>\nCup OD (mm)<\/th>\nCup Width (mm)<\/th>\nMax Rated Torque (Nm)<\/th>\nCommon Applications<\/th>\n<\/tr>\n<\/thead>\n
Series 2<\/td>\n22 mm<\/td>\n54 mm<\/td>\n25 mm<\/td>\nUp to ~500 Nm<\/td>\nTwo-wheel tractor tillers, light implements<\/td>\n<\/tr>\n
Series 4<\/td>\n27 mm<\/td>\n74 mm<\/td>\n34 mm<\/td>\nUp to ~1,500 Nm<\/td>\nSmall sq. balers, compact tillers, light flail mowers<\/td>\n<\/tr>\n
Series 6<\/td>\n35 mm<\/td>\n90 mm<\/td>\n42 mm<\/td>\nUp to ~3,000 Nm<\/td>\nRound balers, discbines, power harrows, feed mixers<\/td>\n<\/tr>\n
Series 8<\/td>\n42 mm<\/td>\n106 mm<\/td>\n52 mm<\/td>\nUp to ~5,000 Nm<\/td>\nLarge sq. balers, forage harvesters, commercial feed mixers<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

To identify the series of an existing cross kit without a part number, measure the outer diameter of one bearing cup with a vernier caliper. This single dimension, compared against the table above, identifies the series with certainty. If the cup OD falls between two series values, the cross kit may be a non-standard specification \u2014 photograph and measure all four dimensions and contact a specialist supplier for identification.<\/p>\n

Signs That a U-Joint Cross Kit Needs Replacement<\/h3>\n