Removing the Pump Head

Tools required

Qty.		p/n	Description
1			A 1/4” open-end wrench
1			A 9/16” open-end wrench
1			A 3/16” hex-drive wrench
1			seal insertion/removal tool
1			Ultrasonic bath
1			Isopropanol
1			Deionized water

Parts required

Qty.		p/n	Description
1		G4301-20200	Seal SFC Booster

NOTE

Each time the booster pump head is removed, the piston seal should be exchanged, since the seal surface may be easily scratched or distorted during removal. For this reason, the procedures are bundled. Cleaning the pump head is optional after visual inspection. Sealing surfaces of the pump head are critical to successful operation. Never use metal tools or paper toweling to wipe, probe or contact these surfaces.

Set the SFC control module mode to OFF.
Wait for the pump head to reach room temperature.
Power off the SFC control module.
Remove the vapor shield
Using the 9/16” and 1/4” wrenches, remove the inlet line from the inlet check valve holder and the outlet line from the outlet check valve holder.
CAUTION
Danger of piston breakage
- Be careful not to break the piston when removing the pump head. Twisting the pump head can cause the piston to break.
Using the 3/16” hex-drive, carefully remove the two knurled nuts at the front of the pump head.
Carefully separate the pump head from the pump. Move the pump head straight out from the pump and remove it from the piston. Be careful not to break or damage the piston. Also remove the seal from the piston if it did not stay in the pump head.
If the seal remains with the pump head, insert the flanged end of the seal insertion/removal tool into the seal cavity. Tilt it slightly so that flange is under the seal and pull out the seal.

21-Jun-2025