Graco EM 380 Instructions-Parts List Manual page 4

REMOVING and
REPLACING
PUMP
Flush if possible. Shut
off
sprayer and unplug power
cord, trigger spray gun and open filter drain valve to
release pressure (provide a container to catch drainage)
and engage trigger safety.
Loosen hose clamp
(17)
and remove suction hose (42).
Unscrew sealing nut (21) from pump. See Fig 1.
Disconnect tube fitting 18) from male connector (10).
See Fig
1.
Use a screwdriver to push retaining spring
133)
aside
and push out pin (34).
Loosen locknut (74) and unscrew pump from drive
assembly
(55).
When installing a new or repaired pump,
fint
rotate
tion. Push pump piston rod (79) all the way down into
crankshaft so connecting rod ( 5 4 ) is in its lowest posi-
pump cylinder
(78).
Screw pump into drive assembly
(55) until you feel. piston rod pressing against connec-
ting rod. Unscrew pump until outlet lines up with outlet
tube
(52).
then unscrew another complete turn.
Tighten locknut
(741.
Locknut must be very tight to
avoid loosening from vibration.
Align holes in piston rod (791 and coupling 1361 and in-
stall pin (34) and retaining spring
133).
Reassemble remaining parts, reverse from disassembly.
Fig
1
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SERVICING
PUMP
(Repair
kit
215902 availablel.
Shut off and unplug sprayer, open filter drain valve to
release pressure (provide a container to catch drainage)
and engage the trigger safety.
Use
repair
k i t
no.
215902
to repair pump.
Use all
parts
in kt, even if old ones look good.
Remove pump from sprayer as described above.
Unscrew intake valve
(80)
from cylinder
(78).
If valve is
Disassembling Pump
seized in housing, squirt penetrating oil around threads
and gently tap around housing
with a light hammer to
loosen. See Fig
2 and 4. Remove ball guide
(721,
stop
pin (71) and ball
(601.
Clean and inspect parts for wear
or damage.
NOTE: Test intake valve by filling it with solvent and
seeing if any leaks past ball.
I t
shouldn't
leak. Valve must be clean for this test; any
dirt
will hold ball off seat and let solvent leak
past.
4
307-371
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