Pulsafeeder PulsaPro 900 EN - Manual (Page 54)

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Difficulty Probable Cause Remedy
Pump loses
hydraulic oil 1. Diaphragm ruptured
2. Leaky seal
3. Cover gasket leaks
4. Eccentric box overfilled Replace
Replace
Replace or retighten
Remove excess oil
Air bleeds
continuously from
PTP (automatic
bleed valve) 1. Hydraulic oil level low
2. Hydraulic bypass valve operating
each stroke
3. Suction pressure too low
4. Oil breakdown. Temperature
high
5. Plugged hydraulic refill inlet
check
6. Air entrained in Oil (foaming
from PTP diagnostic tube)
Refill to correct level
Refer to Hydraulic Bypass Valve
Increase pressure
Change oil type, consult factory
Clean contamination screen
Refer to Re-priming the Pump
Noisy gearing,
knocking 1. Discharge pressure too high
2. Water hammer
3. Hydraulic bypass valve set too
high
4. Stroke length at partial setting
Reduce pressure
Install pulsation dampener
Readjust (refer to Hydraulic Bypass Valve)
Nondestructive knocking sometimes occurs at reduced
stroke lengths.
Piping noisy 1. Pipe size too small
2. Pipe runs too long
3. Surge chamber flooded
4. No Pulsation Dampener used Increase size of piping – install pulsation dampener
Install pulsation dampener in line
Replace with air or inert gas. If a pulsation dampener is
installed, replace diaphragm and recharge
Install pulsation dampener
Motor overheats 1. Pump overloaded
2. High or low voltage
3. Loose wire Check operating conditions against pump design
requirements
Check power source
Trace and correct
Diaphragm
Damage 1. Diaphragm extruded into pump
head holes
Reduce discharge pressure to pump design limits.
Relieve discharge pressure before stopping pump.
Verify PTP bleeder is bypassing oil. Increase dynamic
suction pressure to at least 5 psia. Replace or clean
hydraulic performance valve. Replace worn piston
seals.