AIRLESSCO slow stroker II 3600SL Operation Manual - Fig. 8
23
LOWER CHECK VALVE (SEE FIG. 8 & 10)
1. Screw the lower check valve nut (187-018) out of the pump
housing (187-313) containing intake seat support (187-017).
2. Remove the intake seat (187-065), O-ring (187-034), intake
ball (187-020) and retainer (187-016).
3. Clean all parts and inspect them for wear or damage,
replacing parts as needed. Old "O" rings should be replaced
with new ones.
FLUID
OUTLET
DISTANCE
TUBE
UPPER
CHECK
VALVE
PACKING NUT/
WET CUP
PISTON ROD
UPPER PACKING
(FACE DOWN)
LOWER PACKING
(FACE UP)
WIPER PACKING
(FACE DOWN)
LOWER
CHECK VALVE
LOWER CHECK
VALVE NUT
FLUID INLET
SERVICING UPPER & LOWER CHECK VALVES
FIG. 8
Note: "O"ring PN 187-028 is available in the following materials:
Viton for waterbase paint - letter "V" after part no.
Teflon for other fluids - letter "T" after part no.
4. Clean inside of pump housing (187-313).
5. Reassemble the valve and screw it onto the pump housing if
no further pump service is needed.
PISTON-ROD, UPPER CHECK
VALVE (SEE FIG. 8 & 10)
1. Stop piston rod in middle of it's stroke. Remove retaining
rings (189-048).
2. Slip the sleeve (189-047) off the coupling halfs (189-046)
and remove both coupling halfs. This will disconnect piston
rod from pump drive.
3. Screw the lower check valve nut (187-018) off the pump and
remove lower check valve.
4. Loosen the packing nut and push the piston rod down and
out of the housing.
5. Place rod holder Part No. 187-248 in a vise. Slide the rod
into the holder and lock in place with a 1/4" pin. Push the pin
through the holder and the rod. Screw the seat support
(187-021) out of rod, remove "O"ring (187-033T), seat
(187-044) and ball (115-022) out of the piston rod (187-311).
NOTE: Retainer (187-032) with "O"ring (187-033V) and ball stop
(187-022) may remain in the piston rod. Clean and check visually
the ball stop (187-022) for excessive wear. If ball stop needs to be
replaced, install any screw with thread 1/2-13NC into the threaded
hole of retainer (187-032) and pull straight out.
6. Clean all parts and inspect them carefully for wear or
damage. Inspect the outside of the piston rod for scoring or
wear. Replace these parts if needed. A worn piston rod will
cause premature wear of packings.
7. Install parts back into piston rod as per Fig. 10, pg. 25 VIEW
A as shown.
Note: Before installing discharge seat support (187-021),
place two drops of loctite No. 242 (blue) on threads before
assembling.
8. After installation and tightening of discharge seat support,
check to ensure ball stop (PN 187-022) is properly installed
in piston rod and has not fallen into piston bore. Check by
pushing on the ball and feeling a positive stop against the
ball stop.