Rancilio EGRO 55 Series Technical Manual page 87

6.6 PM GUIDE
A-3. REMOVE UPPER PISTON O-RINGS
A3.1 Place the BGA on the workbench and remove the Upper Piston Assembly (UPA) by loosening the two cotter pins,
and gently pulling the sides of the BGA housing apart and pulling upward on the UPA.
TOOL: 3mm Allen wrench
A3.2 Remove the grounds puck sweeper arm from the UPA by gently pulling on both sides, releasing it from the UPA.
A3.3 Remove upper piston from UPA by turning it up the auger shaft using a 3mm Allen wrench inserted into the gear box
(bottom mounting plate) of the UPA.
TOOL: 3mm Allen wrench
3.1
A
A3.4 Remove the shower screen and the stainless steel upper piston plate by unscrewing the screw on the end of the piston.
Clean parts using a clean towel and water solution and dry thoroughly when clean.
TOOL: Flat headed Screwdriver
PLEASE NOTE: If you are conducting a PM Type 2 please replace the shower screen with a new shower
screen --> PN: 060116
A3.5 Remove the upper piston scrapper ring and the orange O-ring from the piston head.
3.4
A
ALTERNATIVE STEPS FOR PM TYPE 1:
ON-SITE O-RING EXCHANGE
3.2
A
- Section 6: Page 14 -
EGRO 55 SERIES TECHNICAL MANUAL
3.3
A