Sun Pumps SPB 10-16C-1.0 - Manual (Page 3)

retainer.
3. Inspect the Valves for wear, ridges or pitting and replace as needed.
Note: Seating side of Flat Valves may be lapped on flat surface using 240 grit paper.
Quiet Valves due to their shape must be replaced. Insert valve over spring with
dimpled side up.
Note: Do not mix Quiet Valve and Flat Valve Assemblies.
4. Examine Valve Seats for wear, pitting or grooves. Lap the Flat Valve Seats with 240
grit paper or replace if evidence of excessive wear. Quiet Valve Seats must be
replaced if worn. Install seats with dishside down.
5. Examine o-rings and back-up rings on the Valve Seat if used and replace if worn.
Always lubricate o-rings for ease of installation and to avoid damage.
Note: First install o-ring in groove on seat towards seating surface, then back-up ring.
Note: Models without outer groove on seat require the o-ring to be placed on lip of
retainer.
6. Lubricate o-rings on exposed cylinder. Exercise caution when slipping manifold over
Cylinders to avoid damaging cylinder o-rings. Completely press manifold over
cylinders.
7. Replace fasteners and torque per chart.
Note: Replace all original shims if used. When new manifold is used reshim pump.
When starting the pump, check to see that there is no cylinder motion, as this will
cause premature failure of the cylinder o-rings. Center cylinder motion indicates
improper shimming.
SERVICING THE PUMPING SECTION
STANDARD PISTON PUMP
DISASSEMBLY:
1. Remove the discharge manifold as described above.
2. Grasp cylinders by hand and with an up and down motion, pull cylinders from inlet
manifold.
3. Remove cotterpin, nut and washer from piston rod.
4. Next remove retainer, spacer, piston-cup assembly and inlet valve.
REASSEMBLY:
1. Examine inlet valve surface for pitting, scale or grooves. Reverse valves and sand
inlet side of valve using 240 grit paper for clean surface or replace if evidence of
excessive wear. Slip onto rod.
2. Examine Piston seating surface and lightly sand on flat surface using 240 grit paper.