Hydronic Air Driven Pumps & Intensifiers
820 Installation, Use and Maintenance Booklet
1-4-2021
Page 8
Fault Finding Chart
Fault
Cause
Remedy
1] Pump does not
1.1] Low pressure in
1.1] Clear any blockage or
cycle or runs slowly.
compressed air line.
restriction on the air line.
1.2] Formation of ice
1.2] Shut off pump for a
on the exhaust side.
short time and drain off
water from the filter.
1.3] Accumulation
1.3] Remove silencer, clean
of waste in the silencer. and replace.
1.4] Blocked element in 1.4]Close down air-supply,
air filter/regulator.
dismantle and clean filter.
2] Pump loses air from
2.1] Worn valve or seal 2.1] Replace seal or valve.
silencer when stalled.
3] Excess oil leakage
3.1] Worn hydraulic seal 3.1] Replace seal.
from air silencer.
4] Pump cycles without 4.1] Blocked oil-intake
4.1] Clean out filter.
pumping oil.
4.2] Bad connection
4.2] Check for bad connections
on suction line.
or air leaks on suction line.
5] Pump functions but
5.1] Internal leakage
5.1] Find leak source and
only generates low
in the circuit.
change valve.
pressure and does not
5.2] Suction valve seats 5.2] Replace suction valve
stall at max. pressure.
damaged and leaking. parts.
5.3] Output valve seats 5.3] Replace output valve
damaged and leaking. parts.
5.4] Worn oil seal.
4.4] Replace seal.