520-356-000
2/02 Revision A
Page 20
Check Valve Drawing
CHECK VALVE SERVICING
Before servicing the check valve
components, first shut off the suction line
and then the discharge line to the pump.
Next, shut off the compressed air supply,
bleed air pressure from the pump, and
disconnect the air supply line from the
pump. Drain any remaining fluid from the
pump. The pump can now be removed
for service.
To access the check valve
components, remove the manifold/
manifold assembly. Use a
1
/
2
" wrench or
socket to remove the fasteners. Once
the manifold is removed, the check valve
components can be seen.
Inspect the check balls (items 2) for
wear, abrasion, or cuts on the spherical
surface. The check valve seats (item 34)
should be inspected for cuts, abrasive
wear, or embedded material on the
surfaces of both the external and internal
chambers. The spherical surface of the
check balls must seat flush to the
surface of the check valve seats for the
pump to operate to peak efficiency.
Replace any worn or damaged parts as
necessary.
Re-assemble the check valve
components. The seat should fit into the
counter bore of the outer chamber.
The pump can now be reassembled,
reconnected and returned to operation.
24
34
2
11
10
To order call 1-800-548-1191 or visit www.partdeal.com - [email protected]
