Graco EM 380 Instructions-Parts List Manual page 4

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 (8) from male connector (10).
See Fig 1.
Use a screwdriver to push retaining spring (33) aside
and push out pin (34).
Loosen locknut (74) and unscrew pump from drive
assembly (55).
When installing a new or repaired pump, first rotate
crankshaft so connecting rod (54) is in its lowest posi-
tion. Push pump piston rod (79) all the way down into
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 (74). Locknut must be very tight to
avoid loosening from vibration.
Align holes in piston rod (79). and coupling (36) and in-
stall pin (34) and retaining spring (33).
Reassemble remaining parts, reverse from disassembly.
(Repair kit 217-079 available).
Shut off and unplug sprayer, trigger the spray gun,
engage the trigger safety and open filter drain valve to
release pressure (provide a container to catch drainage).
Use repair kit no. 215-902 to repair pump. Use all parts
in kit, even if old ones look good.
Remove pump from sprayer as described above.
Disassembling Pump:
Unscrew intake valve (80) from cylinder (78). If valve is
seized in housing, squirt penetrating oil around threads
and genfly tap around housing with a light hammer to
loosen. See Fig 2 and 4. Remove ball guide (721, stop
pin (71) and ball (60). Clean and inspect parts for wear
r or damage.
NOTE:
Test intake valve by filling it with solvent and
seeing if any leaks past ball. It shouldn't
leak. Valve must be clean for this test; any
dirt will hold ball off seat and let solvent leak
past.
Fig 1
4 307464
Fig 2