Disassembly of the piston rod, CATERPILLAR 931/941/951/955 . Sostituzione O-RING Cat .

Complete guide to Replacing Seals On Hydraulic Cylinder . Procedure valid for Caterpillar 931/941/951/955 and other model like d3/d4
Disassembly procedure for caterpillar hydraulic piston rod and replacement of hydraulic seals.
Note that the locking head was particularly stuck, it was necessary to use a chisel to unlock it.
(revision of the hydraulic piston)
Enjoy...
Procedura di smontaggio stelo pistone idraulico caterpillar (revisione pistone oleodinamico) e sostituzione guarnizioni idrauliche.
Da notare che la testa di chiusura era particolarmente incastrata è stato necessario utilizzare uno scalpello per sbloccarlo .
Buona visione .....

In this video we will:
0:00 - Remove bolts
0:26 - Piston head removal
3:26 - Removal rod
6:53 - Piston detail
7:11 - I try to unscrew the big bolt in the head of the stem
13:02 - Bolt detail
13:33 - Piston head cleaning
20:49 - Seals Installation