61 Series Pilot
Perform this procedure if changing the control spring
for one of a different range or if inspecting, cleaning or
replacing relief valve or any other pilot parts. Pilot part
key numbers are referenced in Figure 9.
1. Remove the pilot from the pipe nipple (key 24)
unless just the control spring is to be changed.
2. To gain access to the control spring or other
internal parts, remove the closing cap assembly
(key 5) and relieve control spring (key 7)
compression by turning the adjusting screw
(key 6) counter clockwise. Change the control
spring and install the adjusting screw and closing
cap assembly if no other maintenance will be
performed. Make sure of the proper control spring
setting according to the Installation and Startup
section and restamp the nameplate if necessary.
3. For any other internal maintenance, relieve control
spring compression according to step 2. Then
remove the cap screws (key 20) and separate the
pilot into three sections; spring case (key 1), body
(key 2) and bottom cover (key 3).
4. To inspect the two diaphragms (keys 14 and 15)
thoroughly, remove the diaphragm nut (key 11),
hex nut (key 19) and the upper and lower relay
heads (keys 16 and 17). The projecting prong in
the body may be used as the restraining member
to keep the yoke from turning while removing the
nuts. Also inspect the O-ring (key 12) and replace
any parts as necessary.
5. Take the yoke (key 4) and attached parts out of
the body to examine the disk holder assembly
(key 9). Remove the relay orifice (key 8) to check
for clogging and replace if necessary.
6. To replace the disk holder assembly, first
unscrew the bleed orifice (key 10). Remove it
and the associated parts. Then unscrew the disk
holder assembly from the bleed valve (key 26)
to gain access to the relay spring (key 13).
Clean or replace any parts as necessary
before reassembling.
7. Upon reassembly, pay particular attention to the
following assembly suggestions.
a. Before replacing the diaphragm case or spring
case, be sure the yoke assembly is positioned
so that it will not bind or rub on the prong in the
relay body.
Figure 6.
Travel Indicator Assembly Drawings
APPLY LUBRICANT (L) OR SEALANT (S)
(1)
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.
P1765
55
55
53
53
54
55
56
76
54
55
56
70
12A
L1
12B
L1
L1
70 L1
57 S1
57 S1
TOP VIEW
LEGACY TRAVEL INDICATOR DETAIL
IMPROVED TRAVEL INDICATOR DETAIL
TOP VIEW
12
Type EZL
