819.4470
16
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. Refer to
page 23 to order the correct kit for your pump. Parts
included in the kit are marked with an asterisk, for
example (201*). Use all the parts in the kit for the
best results.
NOTE:
To ensure proper seating of the balls (301), always
replace the seats (201) when replacing the balls.
Also, on some models, replace the o-rings (202).
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the
Pressure
Relief Procedure
on page 10.
Warning
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) and nuts (114,
used on stainless steel pumps
only
) holding the outlet manifold (103) to the fluid cov-
ers (101). See Fig. 12.
4.
Remove the o-rings (202,
not used on some models
),
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,
not used on some models
),
seats (201), and balls (301) from the fluid covers (101).
Reassembly
1.
Clean all parts and inspect for wear or damage. Replace
parts as needed.
2.
Reassemble in the reverse order, following all notes in
Fig. 12. Be sure the ball checks and manifolds are as-
sembled
exactly
as shown. The arrows (A) on the fluid
covers (101)
must
point toward the outlet manifold (103).
Fig. 12
1
3
2
Apply medium-strength (blue) Loctite or equivalent to the threads.
Torque to 14–17 N
S
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
Aluminum Model Shown
02647B
