Graco EM 380 Instructions-Parts List Manual page 6

REMOVING and REPLACING CONNECTING ROD and BEARING
Shut off and unplug sprayer, trigger spray gun and
open filter drain valve to release pressure (provide a
container to catch drainage) and engage trigger safety.
Remove pump as described above.
Remove the 6 screws (19) and cover (35). Remove the 2
screws and lockwashers (20 and 18). Remove bearing
(53) and connecting rod (541, sliding connecting rod off
of crankshaft. See Fig 5.
Use a screwdriver to push retaining spring (33) aside
and remove pin (34) from coupling (36). Remove coupl-
ing from connecting rod.
Pull connecting rod out of bearing. Wipe clean (don't
use solvent) and inspect surfaces of bearing and con-
necting rod link for wear or damage. If either needs
replacing, you should replace both. When installing rod
and bearing, coat surfaces with SAE 10 non-detergent
motor oil.
Clean and inspect crankshaft. Wipe clean with a rag; do
not use solvent. If crankshaft is badly worn, replace
drive assembly.
Clean and inspect connecting rod needle bearing.
Repack bearing with industrial heavy duty extreme
pressure lithium soap grease.
NOTE:
After every 100 hours of operation, or
whenever servicing the pump (whichever
comes first), fill the cavity in connecting rod
(54) with SAE 10 non-detergent motor oil.
-35
REMOVING and REPLACING DRIVE ASSEMBLY
Shut off and unplug sprayer, trigger spray gun and
open filter drain valve to release pressure (provide a
container to catch drainage) and engage trigger safety.
Fig 6
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