Graco FUSION 309550U Instructions-Parts List Manual page 22

Maintenance
5.
Push mix chamber forward until impingement ports
(IP) are visible. See T
drill to clean ports. Also see identification chart
under Drill Bit Kits, page 39. Some mix chambers
have counterbored holes (CB) and require two drill
sizes to clean impingement ports completely.
IP
CB
Mix Chambers AR and AF,
2020 and 2929
22
3 for appropriate size
ABLE
TI2420A
CB IP
TI3533a
Mix Chambers AR and AF,
4242 or larger
Table 3: Impingement Port Drill Bit Sizes
Mix Chamber Impingement Port (IP)
Part No. Drill Bit Size
in. (mm)
AR2020 #76, .020 (0.50)
AR2929 #69, .029 (0.70)
AR3737 #63, .037 (0.94)
AR4242 #58, .042 (1.00)
AR5252 #55, .052 (1.30)
AR6060 #53, .060 (1.50)
AR7070 #50, .070 (1.75)
AR8686 #44, .086 (2.15)
AF2020 #76, .020 (0.50)
AF2929 #69, .029 (0.70)
AF4242 #58, .042 (1.00)
AF5252 #55, .052 (1.30)
6.
Push mix chamber back in position.
7.
Attach Front End, page 28.
8.
Attach fluid manifold. Connect air. Return gun to
service.
Counterbore (CB)
Drill Bit Size
in. (mm)
#53, .060 (1.50)
#53, .060 (1.50)
N/A
N/A
N/A
N/A
N/A
N/A
#53, .060 (1.50)
#53, .060 (1.50)
N/A
N/A
309550U