Types 1098-EGR and 1098H-EGR
17
P590 Series Filter
Perform this procedure to clean or replace filter parts in a
standard Type P593-1 or P594-1 filter assembly. Remove
the following (as shown in Figure 14): filter body (key 1),
machine screw (key 4), gasket (key 7), two flat washers
(key 5) and filter element (key 2).
Upon reassembly, one of the flat washers must go
between the filter element and filter head (key 3) and
the other must go between the filter element and
gasket. Use a good grade of pipe thread sealant on
the filter head pipe threads.
Type 6351 Pilot
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 key numbers are
referenced in Figure 15 and mounting key numbers in
Figure 23, 24, 25 or 27.
Note
The body assembly (key 1) may remain
on the pipe nipple (key 23, Figure 23
or key 39, Figure 27) unless the entire
pilot is replaced. The optional bonnet
(key 2) for a Type 662 electric remote
control drive unit may remain installed
during maintenance.
1.
To gain access to the diaphragm assembly (key 7),
control spring (key 9) or spring seat (key 8),
loosen the locknut (key 11, not used with Type 662
mounting) and turn the adjusting screw (key 10)
counterclockwise until compression is removed
from the spring. Remove the machine screws
(key 12) and separate the body assembly (key 1)
from the bonnet (key 2).
2. Inspect the removed parts and replace as
necessary. Ensure the registration and bleed
holes in the pilot body are free of debris. After
assembly, make sure of the proper control spring
setting according to the Startup section and
remark the spring case if necessary.
3.
To replace the valve plug (key 4), remove the body
plug (key 3) to let the valve spring (key 6) and
inner valve assembly (key 4) drop freely from the
body (key 1). Inspect the removed parts, replace
if necessary. Make sure the plug seating surfaces
are free from debris. Inspect body plug O-ring
(key 3), replace if necessary. Type 6351 pilots
manufactured before May 1999 need to have the
body plug gasket and the body plug replaced with
a new body plug assembly (key 3), which includes
the body plug and the body plug O-ring. Install the
body plug O-ring over the body plug. Stack the
valve spring and the inner valve assembly on the
body plug assembly (key 3) and install the body
plug assembly with stacked parts into the body.
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 16. Mounting
key numbers are referenced in Figure 23 for
single- pilot constructions and in Figures 25 and 27 for
dual- pilot constructions.
Note
The body (key 1) may remain on the
pipe nipple (key 23, Figure 23 or key 39,
Figure 27) unless the entire pilot
is replaced.
1.
To gain access to the diaphragm assembly (key 5),
diaphragm limiter (key 23) if used, control spring
(key 6), restriction (key 22), stem guide (key 8)
or spring seat (key 7), remove the closing cap
(key 11), loosen the locknut (key 10) and turn the
adjusting screw (key 9) counterclockwise until
compression is removed from the spring. Remove
the machine screws (key 14) and separate the
body from the spring case (key 2).
2. Inspect the removed parts and replace as
necessary. Make sure the restriction and the
registration hole in the body are free from debris.
After assembly, make sure of the proper control
spring setting according to the Startup section and
remark the spring case if necessary.
3. To replace the valve plug (key 4) or bellows
O-ring (key 17), remove the body plug (key 3)
and body plug gasket (key 12). Be careful to
keep the bellows assembly (key 16) from falling
out and possibly getting lost while removing the
valve plug. Inspect the removed parts and replace
as necessary. Make sure the valve plug seating
surfaces are free from debris.
