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Instruction Manual
D200158X012
1. Remove the two screws (key 6), and lift off the proportional band indicator cover (key 36).
2. Disconnect link 4 (key 65) from the bellows bracket (key 31).
3. Remove the screw (key 34), spring (key 33) and bellows adjustment bracket (key 32) from the bellows bracket
(key 31).
4. Refer to figure 4-11 for locations. Remove two screws (key 35) from the bellows assembly.
Figure 4-11. Cutaway View of Bellows Assembly
W3448
5. Remove the four screws (key 6) from the bellows beam (key 49), and remove the bellows bracket.
6. Remove the positive feedback tubing assembly (key 45) from the positive feedback bellows.
CAUTION
When removing and replacing positive feedback bellows, keep in mind that the bellows has left‐hand threads.
Overtightening could damage the threads.
7. Unscrew the bellows.
8. Before installing the replacement bellows, coat the threads with a suitable lubricant. Screw in the replacement
bellows until it is finger tight against the frame (key 3).
9. Install the four screws (key 6) through the bellows bracket (key 31) into the bellows beam (key 49).
10. Install the two screws (key 35) through the bellows bracket (key 31) into the bellows. Install the bellows adjustment
bracket (key 32), spring (key 33) and tighten the screw (key 34) until the spring is compressed completely. Tighten
the two screws (key 35). Ensure the bellows bracket (key 31) is installed correctly so it does not rub against the
frame.
11. Replace the positive feedback tubing assembly on the bellows base.
RESET BELLOWS
TWO SCREWS (KEY 35)
PROPORTIONAL
BELLOWS
BELLOWS BRACKET
LINK 4
FOUR SCREWS (KEY 6)
4194S Controllers
July 2018
35
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