SANDPIPER SSA2-A - Manual (Page 5)

ssa2dl4sm-REV0614 Model SSA2-A Page 3
valve body where the end caps mount. Material may remain from the old gasket. Old
material not cleaned from this area may cause air leakage after reassembly. Take care
that the bumper stays in place allowing the sleeve to press in all the way. Reinstall the
spool, opposite end cap, gasket and bumper on the valve body. After inspecting and
cleaning the gasket surfaces on the valve body and intermediate, reinstall the valve
body on the pump using new gaskets. Tighten the four hex head capscrews evenly
and in an alternating cross pattern.
AIR EXHAUST
If a diaphragm fails, the pumped liquid or fumes can enter the air end of the pump,
and be exhausted into the atmosphere. When pumping hazardous or toxic materials,
pipe the exhaust to an appropriate area for safe disposition.
This pump can be submerged if materials of construction are compatible with the
liquid. The air exhaust must be piped above the liquid level. Piping used for the air
exhaust must not be smaller than 1" (2.54 cm). Reducing the pipe size will restrict
air flow and reduce pump performance .When the product source is at a higher level
than the pump (flooded suction), pipe the exhaust higher than the product source to
prevent siphoning spills.
Freezing or icing-up of the air exhaust can occur under certain temperature and
humidity conditions. Use of an air dryer unit should eliminate most icing problems.
BETWEEN USES
When used for materials that tend to settle out or transform to solid form, the pump
should be completely flushed after each use, to prevent damage. Product remaining
in the pump between uses could dry out or settle out. This could cause problems with
valves and diaphragms at re-start. In freezing temperatures, the pump must be drained
between uses in all cases.
CHECK VALVE SERVICING
Valve inspection requires removal of the ten hand knobs around the outer chamber.
Once the knobs have been removed the outer chamber can be pulled away exposing
the flap valves and valve seats. Visual inspection and removal is possible. The flap
valve should be free to swing on the valve seat. Any obstrucion should be removed. The
opposite side check valves can be inspected by following same procedure.
The flap valve can be disassembled by removing the seal retainer. This makes it possible
to inspect the seal ring, retainer and flap valve. Upon reassembly, torque the retainer (item
28-3) into the flap valve (item 28-1) to a maximum of 43 ft/lbs. (58.30 Newton meters).
DIAPHRAGM SERVICING
To inspect or remove a diaphragm the ten hand knobs around the chamber flange
must be backed off. Pulling the outer chamber away exposes the diaphragm. Use
care to keep foreign matter from behind the diaphragm. The opposite diaphragm
may be inspected by the same procedure.
To remove diaphragms, hold the diaphragm plate opposite to the diaphragm
you wish to remove. Unthread the outer plate on the diaphragm being replaced.
Once plate is removed, the diaphragm assembly will pull out of the bracket. Now the
shaft, shaft seal, and pilot valve actuator bushings are easily inspected.
REASSEMBLY
All procedures for reassembling the pump are the reverse of the previous
instructions with further instructions as shown:
1. Attach an -030- diaphragm to one end of the pump's diaphragm rod (685-033-
120) utilizing the threads of the outer diaphragm plate (612-197-111). The natural
sequence of parts in the assembly is outer diaphragm plate, diaphragm and inner
diaphragm plate. Tighten the assembly by hand. Install the diaphragm bumper
(132-002-360) on the diaphragm rod and install the assembly into the pump.
Attach the pump's outer chamber to this side, securing it in place with the
fasteners. Install the second diaphragm and its components to the opposite side
of the pump in the same sequence. Tighten the assembly to a torque value of 40
ft. lbs. (54.23 Newton meters). You can finish the pump assembly at this point after
any additional maintenance is completed.