Operation & Maintenance Manual | 04/22
02-9242ME
: AHL Series Pump
16
Section 4.0
Unpacking
Section 14.0
Troubleshooting - High Pressure, Liquid Section
Problem:
Pump does not produce liquid flow, operates
irregularly or does not maintain pressure.
Cause:
a) Air in the hydraulic system.
b) Suction line excessively long.
c) Suction tubing sized too small.
d) Failure of one of the check valves.
e) Liquid inlet filter is blocked.
f) High pressure seal excessively worn.
Solution:
a) Check inlet suction line and connections
for leaks and allow pump to flow freely
downstream so as to remove any air.
b) Shorten liquid supply line.
c) Increase tubing ID size between reservoir
and pump inlet.
d) Clean or replace both inlet and outlet
check valve assemblies.
e) Clean or replace liquid inlet filter.
f) Replace high pressure seal assembly.
Problem:
When air is applied to pump the spool will not
actuate.
Cause:
Unregulated air pilot feed line pressure was
shut off at the same time as regulated main
air drive pressure. This caused the Pilot
Control Valve to stop in an incorrect position
at shutdown.
Solution:
Assure unregulated pilot air, regulated air
drive and shutoff valve are arranged as
shown in the “Air Line Schematic” in
Section 7.0.
Turn off regulated air drive pressure.
Pressure should now only be supplied to the
unregulated pilot connection.
Press the manual push button switch on
either end of Pilot Control Valve (see image
below). This will shift the Pilot Control Valve
and then the spool to the position required for
restart. Now supply pump with main regulated
air pressure.
Pilot Control Valve
Use only originally specified parts when installing or
maintaining high-pressure equipment and follow all
Parker Autoclave Engineers maintenance and
assembly procedures. Do not use any parts from
other equipment to make repairs or modifications.
Contact Parker Autoclave Engineers with any
questions or if sufficient information to complete the
installation, maintenance and operation of the
equipment has not been included.
!
WARNING
Section 4.0
Unpacking
Section 15.0
Service
Parker Autoclave Engineers now require all pump repair
be sent to an authorized repair facility. Contact Parker
Autoclave Engineers for recommendations. Pumps
returned for service should be accompanied with the
model number, serial number, manufacture date and
problems you are experiencing.
