Pilot Maintenance - Fisher EZL Instruction Manual

Type EZL
55
L1 12A
P1765 LEGACY TRAVEL INDICATOR DETAIL
APPLY LUBRICANT (L) OR SEALANT (S)
L1 = LITHIUM HYDROXYSTEGRATE NLGI 2 GRADE GREASE
S1 = ANAEROBIC METHACRYLATE SEALANT FOR NUTS AND BOLTS
1. Lubricant and sealant must be selected such that they meet the temperature requirements.
Type EZL 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 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 6 shows the difference
between the designs. The spare parts kits will support
either design. Take care to use the correct O-ring
(key 12A or 12B) when performing maintenance, see
parts list for the appropriate part number.
1. Remove plastic travel indicator cover (key 53).
2. Loosen travel indicator bushing (key 55) and remove
it by sliding it over the travel indicator stem (key 54).
3. Remove indicator fitting (key 56) and inspect O-ring
(key 70). Remove O-ring (key 12B) and back-
up rings (key 76). Replace and lubricate O-ring
if damaged. Pull up on the travel indicator stem
(key 54) to force the spring collet (key 57) out of the
diaphragm head groove. Examine these parts and
the stem for wear and replace if necessary.
12
TOP VIEW
53
54
55
56
L1
70
S1
57
(1)
Figure 6. Travel Indicator Assembly Drawings
55
TOP VIEW
L1
12B
IMPROVED TRAVEL INDICATOR DETAIL
4. Insert the travel indicator stem (key 54) and spring
collet (key 57) back into the diaphragm head
groove. Replace the indicator fitting (key 56) and
O-ring (key 70) and tighten with a referenced torque
of 3.7 foot-pounds / 5 N•m.
5. Lubricate the O-ring (key 12B) and backup rings
(key 76, 2 required). Place one back-up ring on
the stem (key 54) followed by the O-ring and then
the other back-up ring. Push into groove of the
indicator fitting (key 56).
6. Slide the travel indicator bushing (key 55) over
the travel indicator stem (key 54) and tighten
firmly in place.
7. Replace the travel indicator cover (key 53) and
tighten firmly in place.

Pilot Maintenance

Types 6352 through 6354M Pilots
Perform this procedure if changing the control spring
for one of a different range, or if inspecting, cleaning, or
replacing any other pilot parts. Pilot part key numbers
are referenced in Figure 8.
53
54
55
56
76
L1
70
57 S1