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