Graco C Series Instructions-Parts List Manual page 9

'ROBLEM
lisplacement pump output
I W
on upstroke
)isplaGmentpump output
3w on downstroke or both
itrokes
'aint leaks into wet-cup
Low fluid delivery
Spitting from gun
Pump is difficult to prime
:AUSE
Clean. ump inlet screen clogged
SOLUTION
Replace. See page 31. leeve gasket in displacement .
ump
wom or damaged
Replace packings.
See
page 31.
iston packings wom or damaged
Service piston ball check. See page 31.
iston bail check not seating
i m p Inlet screen clogged
~ ~~~ ~ ~
'iston packings wom or damaged
I
Replace packings. See page 31.
?take valve ball check not seating
Clean and service. See page 31.
lroperly
I
rngine RPM too low Increase throttle setting. See Startup,
:lutch wom or damaged Replace. See page 22.
aose wet-cup
Replace packings.
See
page 31.
mroat packings wom or damaged
Tighten
just
enough to stop leakage.
Step 1
I,
page 12.
)isplacement rod wbm or damaged Replace rod. See page 31.
>ump inlet screen clogged.
I
Clean.
~ ~ ~~
Vessure
setting too low Increase pressure. See Startup,
Step
11,
page 12.
I
Engine
RPM
too low
3irty outlet filter, tip filter or tip
,arge pressure drop in hose
4ir in fluid pump or hose
np partially clogged
Fluid supply is low or empty
Increase throttle setting. See Startup,
Step 11, page 12.
Clean.
Use
larger diameter hose.
Check for loose connections at pump in-
take and tighten. Then prime the pump.
See Startup, page 12.
Clear.
Refill and prime the pump. See Startup,
page 12. Check fluid supply often to pre-
vent running the pump dry.
Air leak
Check all hose connections and tighten as
needed.
Reduce
RPM
and cycle pump as slowly
as possible during priming.
Intake valve is leaking
semble and clean intake valve. Be sure
Shut off pump and relieve pressure. Disas-
ball seat is not nicked or wom and that the
ball seats well. Reassemble.
Nom packings
Thin fluid according to supplier's Fluid is too thick
Repack the pump. See page 31.
recommendations.