18 308441
Service
Ball Check Valve Repair
Tools Required
Torque wrench
13 mm socket wrench
O-ring pick
Disassembly
NOTE: A Fluid Section Repair Kit is available. Refer to
page 25 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).
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 10.
1. Relieve the pressure. Disconnect all hoses.
2. Remove the pump from its mounting.
3. Using a 13 mm socket wrench, remove the four
bolts (106) holding the outlet manifold (103) to the
fluid covers (101). See Fig. 10.
4. Remove the o-rings (202, not used on some
models), seats (201), and balls (301) from the
manifold.
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. 10. Be sure the ball checks are
assembled exactly as shown. The arrows (A) on
the fluid covers (101) must point toward the outlet
manifold (103).
03272B
Fig. 10
1
2
Apply medium-strength (blue) Loctite or equivalent to the
threads. Torque to 120–150 in-lb (14–17 Nm). See Torque
Sequence, page 30.
Arrow (A) must point toward
outlet manifold (103).
106
103
101
A
201*
301*
106
102
201*
301*
2
1
1
202*
202*
3
Not used on some models.
3
3
4
Beveled seating surface
must face ball (301).
4
4
3
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