Graco HYDRA-CLEAN C Series Instructions-Parts List Manual page 11

. . .
. .
. .
. .
PROBLEM
Oil leaking at the rear
portion
of
the crankcase
Oil leakage from drain
Plug
in pump
Loud knocking noise
Frequent or premature
failure of the inlet
manifold seals
Short cup life
Strong surging at the
nlet and
low
pressure
)n the discharge side
Jnloader cycling
Water leaking from
rake stem
DIAGNOSIS AND MAINTENANCE CONT.
I
PROBABLE CAUSE
Damaged or improperly installed oil
gauge or crankcase rear cover o-ting,
and drain plug O-ring.
Loose drain plug or worn drain plug
O-ring.
Pulley loose
on
crankshaft
Broken or worn bearing.
Scored rods or sleeves.
Overpressure to inlet manifold
of the cylinders.
Damaged or worn chrome plating
Abrasive material in the fluid
being pumped.
ture of fluid being pumped.
Excessive pressure and/or tempera-
Improper installation of cups,
Overpressure of pumps.
Running pump dry.
Front edge
of
piston sharp.
Chrome plating of cylinders damaged
causing excessive wear of cups. May
be caused by pumping acid solution.
Foreign particles in the inlet or
discharge valve or worn inlet and/or
discharge valves.
florn piston seal.
-eak in system.
-eak in discharge hose.
-oose stuffing box
Norn O-rings on valve stem.
plug O-ring.
Tighten drain plug or replace O-ring.
Check key and tighten'set screw.
Replace bearings.
Replace rods and sleeves.
Reduce inlet pressure per instructions.
Replace the cylinders.
Install proper filtration of pump inlet
plumbing.
Check pressures and fluid inlet temperature
be sure they are within specified range.
Properly install lip of new cup into groove
01
the piston. If not properly installed. the cup
will be extruded past the piston. Piston will
run eccentric; premature failure will result.
Check for foreign material in hose and tips.
Flush out system.
Do not run pump without water.
Replace with new piston.
Install new cups and cylinders. Pump only
fluid compatible with chrome.
discharge valve seats. Discharge valve seat:
Check for smooth lap surfaces
on
inlet and
and inlet valve seats. Discharge valve seats
and inlet valve seats may be lapped on a verl
fine oil stone; damaged cups and discharge
valves cannot be lapped but must be replaced
Replace seal assembly.
Find and repair.
Replace hose.
Tighten.
Replace O-rings.
i