Husqvarna 531RB Workshop Manual page 56

8. Install the snap ring (O) for the bearing on the output
shaft. Install the snap ring (P) for the bearings on the
input shaft.
O
9. Fill the gear with grease.
10. Assemble the remaining parts in the opposite
sequence to how they were disassembled.
56 - Repair instructions
P
935 - 001 -