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Blockages
Clearing a blockage requires a higher than normal
pumping pressure. Depending upon the application or
system design, a blockage usually results in a complete
loss of lubricant flow to the total system and no bearing
receives lubrication.
The loss of flow due to a blockage is first indicated with
the higher than normal system pressure that develops
by the pump as it attempts to overcome the blockage.
Higher pressure is limited, isolated, and signaled
through the use of various performance indicators,
reset and relief, incorporated into the system design.
Contact your Graco distributor for available parts.
Cleaning Valves
NOTICE
• Dirt and foreign material damage lubricating
equipment. Perform all service and disassembly
under the cleanest possible conditions.
• Hard or sharp metal objects, such as punches,
screwdrivers, and picks can scratch and dam-
age the piston bore. When cleaning these sur-
faces use a brass rod and hand pressure only.
1. Follow Pressure Relief Procedure, page 9.
2. Remove end plugs only and try to move each pis-
ton back and forth without removing the piston
from the valve section.
3. If all pistons move freely and there is no indication
of a more serious problem: reinstall the end plugs.
4. If all pistons do not move freely: replace the entire
valve.
Contamination Blockage
If dirt, foreign material or any other form of contamina-
tion is found in a valve, cleaning that valve will only tem-
porarily solve contamination blockage problems. The
source of the contamination must be eliminated for sat-
isfactory service.
The system filtering method must be investigated.
Inspect the filter elements and clean, if necessary.
The reservoir filling method should be reviewed to elim-
inate any chance of foreign material entering the reser-
voir during filling.
3A3995L
Separation Blockage
If a hard wax or soap-like material is found in the valve
section, grease separation is occurring, and the oil is
being squeezed from the grease at normal system
operating pressure, and grease thickener is being
deposited in the divider valve.
Cleaning the divider valve will only temporarily solve the
problem. Consult your lubricant supplier for recommen-
dations on alternate lubricants and your local Graco
distributor to verify compatibility with centralized lubri-
cating systems.
Operation
13
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