Pulsafeeder Pulsa Series 680 EN - Manual (Page 22)

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Difficulty Probable Cause Remedy
Delivery Erratic 1. Leak in suction line.
2. Product cavitating.
3. Entrained air or gas in product.
4. Motor speed erratic.
5. Fouled check valves. 1. Locate and correct.
2. Increase suction pressure.
3. Consult factory for suggested
venting.
4. Check voltage, hertz.
5. Clean, replace if necessary.
Delivery Higher Than
Rated 1. Suction pressure higher than
discharge pressure.
2. Discharge piping too small.
3. Back pressure valve set too low.
4. Back pressure valve leaks.
1. Install back pressure valve or
consult factory for piping
recommendations.
2. Increase pipe size-install
PULSAtrol pulsation dampener at
pump in discharge line.
3. Increase setting.
4. Repair, clean, or replace.
Pump Loses Oil 1. Diaphragm ruptured.
2. Leaky oil seal.
3. Cover gasket leaks.
4. Pump head gasket leaks.
5. Gear box overfilled.
1. Replace.
2. Replace.
3. Replace or tighten.
4. Replace. Tighten pump head bolts.
Seal with permatex.
5. Remove excess oil.
Air Continuously
Bleeds From
Automated Air Bleed
Valve 1. Oil in reservoir low.
2. Hydraulic bypass valve opening
continuously.
3. Suction pressure too low.
4. Breakdown of oil, temperature high.
1. Refill to correct level.
2. Refer to “Hydraulic Bypass Valve”.
3. Increase pressure.
4. Change oil type, consult factory.
Noisy Gearing,
Knocking 1. Discharge pressure too high.
2. Water hammer.
3. Worn bearings.
4. Worn gears.
5. End play in worm shaft.
6. Eccentric or worm gear.
7. Bypass valve set too high. 1. Reduce pressure or discharge piping
size.
2. Install PULSAtrol.
3. Replace.
4. Replace gears & check for improper
hydraulic bypass valve setting.
5. Consult factory.
6. Tighten or replace assembly.
7. Readjust (see “Hydraulic bypass
Valve”.