Corken Z2000 - Appendix G: Troubleshooting Guide (Continued); Advanced Troubleshooting Scenarios

Appendix G—Troubleshooting Guide (continued)
Problem Cause Solution
Low capacity
(continued)
Suction pipe too small or
restricted
Indicated by pump inlet pressure dropping several pounds
when pump is started. Remove restriction or modify piping.
Worn vanes Replace.
Pump without vapor return Without vapor equalization, a pump can remove only about 3%
of the truck tank capacity per minute without severe cavitation
and capacity loss.
Worn sideplates Reverse or replace sideplates. Check universal drive assembly
to make sure angularity is within limits, yokes are parallel and
slip-joint is greased. Check bearings. Check pulley alignment
on belt drive pumps.
Vanes sticking Remove vanes and clean out foreign matter (check strainer).
Replace vanes if swollen.
Pump runs but no
ow
Valve closed Check valves. Make sure internal tank excess ow valve is
open! Refer to manufacturer’s instructions.
Excess ow valve slugged Stop pump until valve opens. If problem continues, slow pump
down or install a new or larger excess ow valve.
Broken shaft Disassemble and inspect pump. Repair if necessary.
Defective meter Service meter.
Pump will not turn–
locked up
Foreign matter in pump Clean out the pump —check strainer in suction line.
Vanes broken Clean out pump carefully and replace vanes. Has pump been
operated dry? Then, check for damage to cam and rotor shaft
assembly.
Bearing seized Replace pump bearings. Grease monthly. Use ball bearing
grease manufactured for intended service.
Moisture frozen in pump Let thaw and break loose carefully. Add methanol to tank (on
LP-Gas). Check with product supplier about possibility of water
in gas.
Will not build
pressure
Poor suction conditions Clean inlet strainer. Increase pipe size.
External bypass valve set too
low
Set valve for higher pressure—see instructions. See IH102 and
IH106 IOM manuals for more information.
Worn vanes and/or sideplates Disassemble, inspect and repair as necessary. Do not run dry!
Pump is noisy Cavitation from poor suction
conditions
As above.
Vanes sticking As above.
Bearings worn Replace—grease monthly.
Meter screen clogged Clean
Very high differential pressure Check for restriction in discharge line. Delivery hose too small
and too long. Slow down pump!
Check vapor release oat assembly on meter and meter
differential valve.
PTO shaft vibration Inspect and repair driveline component.
Pump leaks
around shaft
Seal or O-rings failed Inspect seal assembly and replace if necessary. Keep new
seal very clean when replacing seal. Recommend a light oil
lm on O-rings. Do not run pump dry!
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