OEM-specification CAT 4D4325. CTP aftermarket replacement. Part number 4D4324. Compatible with 631e, 631g, 633e, 633e ii, 637e, 637g, 641b, 650b, 651, 651b, 651e, 657, 657b, 657e, 657g, 666, 772, 772b, 773, 773b, 773D, 773e, 773F, 773g, 773g LrC, 775b, 775D, 775e, 775F, 775g, 775g LrC.
Always verify with serial number before ordering.
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Never strike bearings directly — use a bearing press or driver set. Heat housing (not bearing) to ease installation. Replace bearings in sets where applicable. Check housing bore diameter before fitting — out-of-round bores destroy new bearings.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.