User's Manual

15307707
Service
(Models 238983, 238984, 238985, 238986, 238987, 238988)
Installing Diaphragm Repair Kit
Diaphragm and Seal Repair Kit 248079 is available
and can be ordered separately.
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 Drawing on page 19.
Disassembly
1. To manually relieve gas pressure in the tank,
remove the relief valve cap (17) and the cap from
the charge valve (15). 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 (8), plain washers (11), lock washers
(10), and hex nuts (9).
3. Separate the air housing (2) from the fluid housing
(1). Be careful that you do not damage the
machined flange surfaces or components attached
to either housing.
4. Remove and discard the diaphragms (6 and 7).
Reassembly
1. Carefully and thoroughly clean all housing flange
and diaphragm bead sealing surfaces.
2. Lay the diaphragm (7a,b) in place on the lower
fluid housing (1) with the center contour (the
convex side) facing upward.
3. Lay the cream-colored TPE backing diaphragm (6)
over the diaphragm (7a, b). The diaphragms
should fit closely together.
4. Reassemble the air housing (2) and the fluid
housing (1) carefully. Make sure the diaphragms
remain in the grooves and are not pinched.
5. Replace the flange hardware with the capscrews,
nuts, and washers that are provided with the
Diaphragm Repair Kit.
6. Torque the M12 cap screws (8) using a
star-pattern sequence in two successive steps to a
final torque of 68 to 81 N-m (50 to 60 ft-lb).
7. Follow the Charging the Tank instructions on
page 10. See the rest of the Operation section on
page 10 to return the surge tank to service.