Emerson Fisher LR128 Instruction Manual page 13

FLANGED NUT
(KEY 13)
W7394
Travel Indicator Assembly Maintenance
Travel indicator assembly key numbers are referenced
in Figures 8, 11 and 15. The indicator assembly
can be removed and installed without removing the
bonnet (key 2) from the body (key 1). Travel indicator
maintenance is performed for two reasons:
a. When damaged or worn parts need replacing.
b. When travel indicator is removed and replaced
with a travel indicator plug assembly.
!
Avoid personal injury or damage
to property from sudden release of
pressure or uncontrolled process
fluid. Before starting to disassemble,
carefully release all pressures
according to the shutdown procedure.
Use gauges to monitor inlet, loading
and outlet pressures while releasing
these pressures.
1. Remove the indicator protector (key 22, Figure 7)
and indicator cover (key 21).
2. Remove the first hex nut (key 4) and the indicator
washer (key 20).
3. Unscrew but do not completely remove the second
hex nut (key 4) on the top of the indicator stem
(key 15).
4. Use a wrench to remove indicator fitting (key 19).
5. Lift out travel indicator assembly. If replacing travel
indicator with travel indicator plug, skip to step 9.
BOTTOM PLUG
(KEY 11)
O-RING
(KEY 10)
Figure 7. Diaphragm and Plug Assembly Components
WARNING
DIAPHRAGM
(KEY 9)
O-RING
(KEY 70)
6. Compress the main spring (key 12). Remove the
second hex nut (key 4). Parts will separate easily
when the hex nut is removed.
7. Slide the indicator stem (key 15) out of the
indicator fitting (key 19). The main spring (key 12)
and upper spring seat (key 17) will disengage.
8. If necessary, use the indicator stem (key 15) to pry
the back-up rings (key 16) and O-ring (key 18)
out of the indicator fitting (key 19).
9. Check the indicator fitting O-ring (key 6). Lubricate
and replace if necessary.
10. To replace travel indicator parts, lubricate
all O-rings, back-up rings and threads. To
reassemble, hold the indicator stem (key 15) and
place the parts on the stem in the following order
(see Figure 8).
• Main Spring (key 12), small end first
• Upper Spring Seat (key 17), make sure to place
the large end toward the spring
• First Back-up Ring (key 16)
• O-ring (key 18)
• Second Back-up Ring (key 16)
• Indicator Fitting (key 19), the back-up rings
(key 16) and O-ring (key 18) should slide into
the indicator fitting and the small end of the
upper spring seat (key 17) should slide into the
indicator fitting.
• First Hex Nut (key 4)
• Indicator Washer (key 20)
• Second Hex Nut (key 4)
Type LR128
TOP PLUG O-RING
(KEY 14)
TOP PLUG
(KEY 5)
13