POLYURETHANE
MACHINERY
CORPORATION
PH-2 SERVICE MANUAL
13. MAINTENANCE
13.4 METERING PUMP-LINE
WARNING! Before performing any maintenance, make sure the
Main Power Switch is OFF and incoming power is locked OFF. Al-
low material temperature to cool below 80
◦
F and bleed all material
pressure to zero.
Weekly:
When the Proportioning Pumps are functioning properly it is not unusual for
a small amount of Poly (R) material to appear on the Pump Shaft. This material should be
wiped away so dirt does not accumulate on the Pump Shaft and the Pump Shaft Packings
are not damaged.
Yearly or as required: It is not unusual for those who use the PH Series Proportioner
on a regular basis to rebuild the Proportioning Pumps on a yearly basis and service the
Hydraulic Drive System (See page 49) at the same time, while the Proportioner is out of
service.
13.5 PUMP SEAL REPLACEMENT
The pump rebuild kit part number for low pressure pumps is KT-PA and for high pressure
pumps is KT-PAX.
NOTE!
• When Iso (A) Proportioning Pump Cylinder is disassembled for service, all
parts included in the Seal Kit (KT-PA) should be replaced.
• When the Poly (R) Proportioning Pump Cylinder is disassembled for ser-
vice, all parts included in the Seal Kit (KT-PA) should be replaced.
• When assembling Proportioning Pump, lubricate all Seals, Piston Rod, and
Pump Cylinder with # 1 Lithium Grease to assist in assembly and minimize
Seal damage during re-assembly.
CAUTION! Use wooden or plastic tools or a brass brush for clean-
ing. Do not use metal or abrasive tools that can scratch the contact
surfaces.
REVISION 1.2 50
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