Fisher 3660 Instruction Manual page 18

3660 and 3661 Positioners
September 2015
Figure 11. Range Spring Installation
FEEDBACK
SHAFT
W7366
CAUTION
Installation of the feedback lever assembly (key 19) prior to installation of the range spring (key 30) may result in damage
to the lever assembly (key 17) flexures. The range spring must be in place before pushing the feedback lever assembly
bushing fully into the positioner housing.
10. Ensure the range spring (key 30) is properly aligned as shown in figure 12, then, as shown in figure 13, place hands
on both sides of the positioner and press firmly until the feedback lever assembly bushing shoulder is against the
positioner housing (figure 14).
11. While holding the feedback lever assembly bushing securely against the housing, tighten the retaining screw (key
19P). The feedback lever assembly bushing should be tight against the positioner housing as shown in figure 14.
Figure 13. Pressing the Feedback Lever Assembly
Bushing into the Positioner
W7365
18
Figure 12. Range Spring Alignment
SECTION A
LEVER
ASSEMBLY A5211
Figure 14. Feedback Lever Assembly in Operating
Position
ZERO ADJUST
(SELF‐LOCKING)
W7366
STRAIGHT PORTION
RANGE SPRING
OF SPRING
FEEDBACK
SHAFT
SLOT
BUSHING (AGAINST
POSITIONER
HOUSING)
Instruction Manual
D101402X012
LEVER
ASSEMBLY
BOSS