Troubleshooting
Ampco Pumps Company
Page 35
Ampco Pumps Company ZP3 Manual M-004 Rev A 10.15
Troubleshooting
Symptom
Cause
Solution
Noisy Operation
(cavitation)
Product’s viscosity, vapor
pressure and temperature are too
high
Check system setup. Change speeds and
temperatures, accordingly
The inlet pressure available is less
then required
Check inlet pressure requirements and adjust
accordingly
Noisy Operation
(air or gas in fluid)
Air leaks in the system
Check for leaks and correct, if needed
Product emits gases
Install pressure relief valves
Noisy Operation
(rotor to body contact)
Assembly without checking fluid
end clearances
Check pump clearances and adjust, if
necessary (page 22)
Internal stresses in pump caused
by improper piping support
Adjust system to eliminate stresses (page 8)
Pressures are higher then what
the pump is rated for
Reduce pressures
Bearings are worn
Check for bearing movement (page 14) and
replace, if necessary
Noisy Operation
(rotor to rotor contact)
Gears are loose or incorrectly
timed (damage to rotor may be
severe )
Rebuild pump with new parts
Keys are sheared
Inspect and rebuild, if necessary
Gears are worn
Inspect and replace gears, if needed. Inspect
damage to rotors and rebuild, if necessary
Noisy Operation
(external mechanical
problems)
Gear drive, drive belts, coupling or
bearings are worn or not correctly
adjusted
Check and replace. Adjust, if needed
Product is abrasive
Check system, and possibly implement a
larger pump at lower speeds
Pump speeds and pressures are
higher than pump rating
Check system and change, if necessary.
Reduce speeds and pressure of pump
Improper gear case lubrication
Check and replace worn out gears and
bearings; follow procedures on page 12 for
proper lubrication
Water build up in Gear case
Check that all gear case plugs are in place
Misalignment in system (piping or
pump drive)
Check and modify system to eliminate
alignment issues
Short Pump Life