User's Manual

14 307707
Service
(Models 218509 and 220157)
Installing Diaphragm and Seal Repair Kit
Diaphragm and Seal Repair Kits are available and can
be ordered separately as follows:
 Kit 218799, for Model 218509 surge tank
 Kit 234118, for Model 220157 surge tank
WARNING
Follow the Pressure Relief Procedure on page 9
before you check or service the surge tank or
remove the surge tank from the system. All fluid
and gas charge pressure must be relieved com-
pletely before you attempt any service.
See the Parts Drawings on pages 17 and 18.
Disassembly
1. To manually relieve gas pressure in the tank,
remove the relief valve cap (27) and the cap from
the charge valve (6). Press down the valve stem
until all gas pressure is relieved.
NOTE: Relieving all gas pressure takes several
minutes.
2. Disassemble the surge tank by removing the M12
cap screws (2), lock washers (3), and hex nuts (4).
NOTE: Model 220157 does not contain
lockwashers (3) or hex nuts (4).
3. Separate the air section (7) from the fluid section
(8). Be careful that you do not damage the
machined flange surfaces or components attached
to either housing.
4. Remove and discard the diaphragm (1a) and the
two o-rings (1b).
Reassembly
1. Carefully and thoroughly clean all housing flange
and o-ring sealing surfaces. Clean and dry an area
at least 12 mm (0.5 in.) inside the o-ring diameter
on the upper air housing (7) for application of the
special gasket joint sealant (38).
2. Install the new o-rings (1b), and lay the diaphragm
(1a) in place on the lower fluid housing (8).
3. Remove the printed release paper from the gasket
joint sealant (38) adhesive strip.
NOTE: Be careful not to remove the adhesive with
the release paper. Check to be sure that the
adhesive stays on the joint sealant. If the adhesive
sticks to the release paper and begins to lift off the
joint sealant, stop and trim to a new length, or start
from the opposite end and try again.
4. Place the gasket joint sealant (38) on the upper air
housing (7) within 3 mm (1/8 in.) of the internal
diameter of the o-ring groove as follows. Be careful
that you do not twist or damage the joint sealant
during installation.
a. Begin and finish the sealant ends directly
inward from a bolt hole. See Detail in Parts
Drawings.
b. Overlap the ends of the sealant by at least
10 mm (3/8 in.) as shown. Point the ends
inward.
c. Trim off excess length of joint sealant as
necessary.
5. Reassemble the housings carefully, making sure
the joint sealant remains in place.
6. Torque the M12 cap screws (2) using a star
pattern sequence, in three successive steps, to a
final torque of 63 to 73 N-m (46 to 54 ft-lb).
7. Follow the instructions for Charging the Tank on
page 10, and see Operation on page 9 to return
the surge tank to service.