7
Type FL
Check sleeve (key 16) seating surface for damage. Check
O-rings (keys 3 and 4) and anti-friction rings (key 2),
replace if necessary.
6. Reassemble in reverse order. Refer to Table 3 for torque
values. Tighten all bolts using a star pattern and repeat
2 to 3 times to ensure proper torque.
Type FL Travel Indicator Maintenance
A
new and improved version of the travel indicator has
been phased in during 2013. The new version improves the
O-ring stem seal to minimize leakage and extend service
life. The components of the legacy and new versions are
not interchangeable. If maintenance is performed on the
travel indicator, it is recommended to replace the entire travel
indicator assembly with the new version. Part numbers for
the assemblies are shown in the parts list. Figure 3 shows
the difference between the designs. The spare parts kits will
support either design. Take care to use the correct O-ring
(key 37A or 37B) when performing maintenance, see parts list
for the appropriate part number.
1. Remove plastic travel indicator cover (key 40).
2. Loosen travel indicator bushing (key 38) and remove it
by sliding it over the travel indicator stem (key 34).
3.
Remove indicator fitting (key 36) and inspect
O-ring
(key 35). Remove O-ring (key 37B) and back-up rings
(key 66). Replace and lubricate O-ring if damaged.
Pull up on the travel indicator stem (key 34) to force the
spring collet (key 33) out of the diaphragm head groove.
Examine these parts and the stem for wear and replace
if necessary.
4. Insert the travel indicator stem (key 34) and spring
collet (key 33) back into the diaphragm head groove.
Replace the indicator fitting (key 36) and O-ring
(key 35) and tighten with a reference torque of
3.7 foot-pounds / 5.0 N•m.
5. Lubricate the O-ring (key 37B) and back-up rings
(key 66, 2 required). Place one back-up ring on the
stem (key 34) followed by the O-ring and then the other
back-up ring. Push into groove of the indicator fitting
(key 36).
6. Slide the travel indicator bushing (key 38) over the
travel indicator stem (key 34) and tighten firmly
in place.
7. Replace the travel indicator cover (key 40) and tighten
firmly in place.
Type PRX/182 Pilot Maintenance (Figure 7)
CAUTION
Always remove spring (key 7) tension before
performing maintenance on this unit. To
remove spring tension, loosen locknut (key 2)
and back out adjusting screw (key 1) until
compression is removed from the spring.
Lower Diaphragm Maintenance
1. Disconnect pilot and remove it from the line.
2. Remove machine screws (key 10) from lower cover
(key 21) and the separate lower cover from the body
(key 16).
3.
Use a wrench to hold the stem (key 23) and break loose
the stem nut (key 20). Remove the stem nut and washer
(key 11).
4. Remove the diaphragm plate (key 13), diaphragm
(key 14), lower diaphragm plate (key 15), and O-ring
(key 18). Inspect parts for damage or wear, replace
if necessary.
5. Lightly lubricate the O-ring (key 25). Place O-ring
over the stem (key 23) and press it down into the body
(key16).
6. Lightly lubricate the rims of the diaphragm (key 14) and
place it on top of the lower diaphragm plate (key 15).
Set the diaphragm plate (key 13) on the diaphragm
(key 14).
7. Lightly lubricate the O-ring (key 18) and place it in the
lower cover (key 21).
8. Place the washer (key 11) and stem nut (key 20) on
the stem (key 23) and tighten.
If also performing Upper
Case Maintenance, skip to step 2 of the Upper Case
Maintenance section.
9. Insert washers (key 11) and machine screws (key 10) in
the lower cover (key 21) and tighten uniformly to ensure
proper seal.
Upper Diaphragm Maintenance
1. Disconnect pilot and remove it from the line.
2. Loosen locknut (key 2) and back out adjusting screw
(key 1) until compression is removed from the spring.
Remove cap (key 3).
3. Lift the upper spring seat (key 6), spring (key 7), and
O-ring (key 4) out of the spring case (key 8). Inspect
O-ring and replace if necessary.
4. Remove the machine screws (key 10) and the washers
(key 11), separate the spring case (key 8) from the body
(key 16), and lift the lower spring seat (key 9) away from
upper diaphragm nut (key 26). Use a wrench to hold
stem (key 23) securely while removing the upper
diaphragm nut.
5. Remove remaining loose components: washer
(key 11), upper diaphragm plate (key 13), diaphragm
(key 14), disk holder (key 22), and O-ring (key 18).
Inspect diaphragm and O-ring for damage or wear,
and replace if necessary.
