Rancilio EGRO 55 Series Technical Manual page 103

6.7 BREW GROUP REBUILD GUIDE
4. DISASSEMBLE AND CLEAN THE UPA --- Continued
4.7
4.7 Remove the upper piston scrapper ring and the orange O-ring from the piston head
4.8 Wipe all upper piston components clean with water solution and towel
4.9 Wipe entire upper assembly clean with a damp towel
4.10
4.10 Clean all lube from auger shaft using a piece of plastic wrap or a towel.
! !
CAUTION: do not use paper towels as pieces of them may get into threads of auger and cause damage
TIP: Use a short piece of plastic wrap to clean auger shaft. Wrap plastic around auger and move it up
the auger by inserting a 3mm Allen wrench into the gear box of the UPA.
TOOL: 3mm Allen Wrench
4.9
- Section 6: Page 30 -
EGRO 55 SERIES TECHNICAL MANUAL