PrimeLine™ HPLC Pumps
Easy Maintenance and Repair
Replacing the Check Valve Cartridges
The pump inlet and outlet check valve cartridges are contained in hex nut housings located on the top (outlet) and bottom (inlet) of the pump head assembly.
Outlet Check Valve Cartridge
Using the 1/4” open end wrench (provided) loosen the 1/16” cross over tube nuts and remove the 1/16” cross over tube. Remove the outlet housing with a 1/2” open end wrench and replace the outlet cartridge making sure the ASI arrow on the cartridge is aligned with the flow direction. Replace the housing and cross over tube and tighten all fittings until they are leak free.
Inlet Check Valve Cartridge
Remove the fingertight fitting on the inlet line and follow the same general directions for replacing the outlet cartridge. Be sure the ASI arrow on the cartridge is aligned with the flow direction.
Replacing the Piston Seal Assemblies
Using the 9/64” Allen wrench with a T bar handle loosen and remove the screws which connect the pump head to the manifold and spring housing. Remove and pull the pump head away from the pump. This step will expose the two piston seal assemblies. The seals may be grasped with the finger tips and gently pulled forward and free of the piston.
Push the new piston seal assembly over the end of the exposed piston with a finger tip or thumb. This procedure aligns the piston seal assembly on the piston. When the pump head is pressed firmly against the manifold, the seals will be pressed over the pistons.
Replacing the Pistons
Using the 9/64” T Bar allen wrench, remove the pump head, piston seal assemblies, manifold, and wash seal assemblies, if installed. Using the same tool, remove the screws which attach the spring housing to the frame drive casting. Pull the spring housing free from the pump. The piston shafts are now visibly protruding from the rear of the assembly. Gently remove the pistons from the spring housing assembly. To re-install pistons, push the pistons back into the spring housing through the rear bushings.
