User's Manual

16 307707
Service
(Model 233736)
Diaphragm Repair
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 20.
Disassembly
1. To manually relieve air pressure in the tank, back
out the plug (11).
2. Disassemble the surge tank by removing the cap
screws (8).
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 the screw (10) and diaphragm plates (5,
6). Discard the diaphragm (7).
Reassembly
1. Carefully and thoroughly clean all housing flange
and diaphragm sealing surfaces.
2. Apply thread sealant to the screw (10). Assemble
the air side plate (6), diaphragm (7), fluid side plate
(5), and screw (10) as shown in the parts drawing.
Torque the screw to 2 to 3 N-m (1.5 to 2.2 ft-lb).
Lay the diaphragm (7) in the lower fluid housing (1)
with the smaller air side plate facing upward.
3. Reassemble the air housing (2) and the fluid
housing (1) carefully. Make sure the diaphragm is
not pinched.
4. Replace the capscrews (8) loosely, then torque the
screws (8) to 18 to 22 N-m (13 to 16 ft-lb), using a
star-pattern sequence.
5. Follow the Charging the Tank with Air
instructions on page 12. See the rest of the
Operation section on page 12 to return the surge
tank to service.