20
and tighten the packing nut. Replace
fence.
CAUTION: The packing nut should be
tightened just enough to stop leakage
only, but not any tighter. Overtightening
will damage the packings and reduce
packing life.
3. Clean the intake check ball and seat.
To clean:
a. Using the supplied dual purpose
wrench, loosen the gland nut
to remove the suction tube (or
hopper).
b. Remove the check ball and ball
guide and clean all related parts.
c. Replace in the reverse of assembly
and tighten.
PUMP PACKINGS
The packings are a wearing part. If the
pump can no longer maintain pressure,
has diffculty priming and paint seeps into
the throat of the pump, and tightening
the packing nut no longer helps, then the
packings will require replacement. This is best
entrusted to a qualied repair technician.
To remove the pump and replace the
packings, follow the instructions below:
PUMP REMOVAL
1. Use the special spline wrench to loosen
the gland nut (2) and remove the
pickup tube (3) from the bottom of the
pump. At the same time remove the
inlet ball seat disc (5), o-ring (6), check
ball (7) and ball guide (8)
2. Lay the machine on its back and
remove the heat sink electronics unit
(67). This will allow access to unplug the
pressure sensor (12) from the electronics
unit.
3. Disconnect the junction (42) and three
screws (40) on the pump filter bracket
and remove the pump lter.
4. Turn the pump until the piston is at its
lowest point. This will allow the retaining
ring (33) to be removed. This in turn will
allow you to push out the pump wrist
pin (35).
5. Remove the four bolts (9) to take off the
pump unit.
6. Replacement is the reverse of removal.
Grease the exposed portion of the
piston and wrist pin when assembling.
PACKINGS REPLACEMENT:
1. Loosen screws (46) , remove the gear
cover (47).
2. Loosen T-wrench clamp (28) and open
the cover of Pump Carrier Clamp.
3. Loosen screws (26) , remove the Pump
Carrier Clamp (25).
4. Release Retaining Ring (40) , remove
the Pump Wrist Pin (42).
5. Separate the Pump Housing (19) from
the Drive piston (41).
6. Release the gland nut (2) from the
Pump Housing (19).
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