Manual

17
Service
Ball Check Valve Repair
Tools Required
D Torque wrench
D 10 mm socket wrench
D O-ring pick
Disassembly
NOTE: A Fluid Section Repair Kit is available. Use
784–90617 for Hytrel Diaphragm pumps and 784–90618
for Teflon Diaphragm pumps.
NOTE: To ensure proper seating of the balls (301), always
replace the seats (201) when replacing the balls. Also
replace the o-rings (202).
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
1. Relieve the pressure. Disconnect all hoses.
2. Remove the pump from its mounting.
3. Using a 10 mm socket wrench, remove the four bolts
(106) holding the outlet manifold (103) to the fluid
covers (101). See Fig. 11.
4. Remove the o-rings (202), seats (201), and balls (301)
from the manifold (103).
5. Turn the pump over and remove the inlet manifold
(102). Remove the o-rings (202), seats (201), and balls
(301) from the fluid covers (101).
Reassembly
1. Clean all parts and inspect for wear or damage. Re-
place parts as needed.
2. Reassemble in the reverse order, following all notes in
Fig. 11. Be sure the ball checks and manifolds are
assembled exactly as shown. The arrows (A) on the
fluid covers (101) must point toward the outlet man-
ifold (103).
02647A
Figure 11
1
3
2
Apply medium-strength (blue) LoctiteR or equivalent to the
threads, and torque to 120–150 in-lb (14–17 N.m).
Beveled seating surface must face the ball (301).
Arrow (A) must point toward outlet manifold (103).
4
Not used on some models.
106
103
101
A
201*
301*
106
102
201*
301*
2
1
1
202*
202*
4
4
3
3
202*
4
202*
4