3-56 Troubleshooting, Testing, and Maintenance
Dual check valve assembly
Removing the pump head
The figure below is an exploded diagram of a pump head.
Pump head disassembly
To remove the pump head:
1. Shut down the controller, and disconnect the power cord. The
proportioning valve stops all solvent lines.
2. Disconnect the inlet line from the inlet check valve. If necessary, use a
5/16-inch wrench to loosen the inlet line. Let solvent drain onto an
absorbent wipe.
Ball
Seat
Seal guide
Seat
Seal guide
Outlet check
valve housing
Outlet check
valve housing
ALLEN SCREW
PUMP HEAD
PUMP SEAL
Plunger bearings
Pump seal
Pump head
Hex-head screws
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