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15
DAILY MAINTENANCE
1.
Keep the displacement pump
packing nut lubricated with Q-Lube
Piston Lubricant at all times.
Add
about five drops of oil to the top of the
pump at the beginning of each day.
Then two drops for every hour of
spraying. The lubricant helps protect
the piston, rod and packings.
2.
Inspect the packing nut daily.
If either
of the following conditions exists the
packing nut should be tightened:
a. Seepage of material past the
packing is found.
b. While the system is pressurized
during the intervals when the motor
is not running, the piston doesn't
hold its position. Rather, it tends to
slip upward.
To tighten the packing nut: Reach the
tommy bar through the opening and
tighten the packing nut.
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:
1. Remove the suction tube (73) by
releasing the hose clip (71) and pulling
the hose free. Use a wrench to loosen
the gland nut.
2. Remove the check ball and ball guide
and clean all related parts.
3. 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 qualified repair
technician.
To remove the pump and replace the
packings, follow the instructions below:
PUMP REMOVAL
1. Remove the suction tube by releasing
the hose clip and pulling the hose free.
2. Turn the pump until the piston is at its
lowest point. To do this, it is necessary
to remove the left side frame leg (77)
and then remove the 12 screws to
remove the left side motor housing
(38). Then the motor may be turned by
turning the fan from the rear.
3. Loosen and remove the 4 socket cap
screws (65)
4. Pull the pump forward to disengage
the displacement piston (53) from the
slot in the bottom of the drive piston
(45). (It must be at its lowest point in
order to disengage-see step 2 above)
5. The pump unit may now be lifted away.
6. Replacement is the reverse of removal.
Grease the junction slot of the drive
piston when assembling.
PACKINGS REPLACEMENT
1. Loosen the packing nut with the
tommy bar supplied and remove.
2. Pull out the piston.
3. Remove all parts and clean. Clamp the
displacement piston (53) in the soft
jaws of a vise and remove the ball seat
fastener (56) to allow removal of the
small ball seat (54) and the small check
ball.
4. Discard all old packings.
5. Soak the new leather packings in W30
oil for at least one hour before
assembling.
