Gorman-Rupp Pumps 86A2-F3L 1257390 thru 1330588 - Manual (Page 19)

OM--00955 80 SERIES
TROUBLESHOOTING PAGE D -- 2
Table 1. Troubleshooting Chart (cont.)
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP STOPS OR FAILS
TO DELIVER RATED
FLOW OR PRESSURE
(cont.)
Leaking or worn seal or pump gas-
ket.
Suction intake not submerged at
proper level or sump too small.
Strainer clogged.
Impeller or other wearing parts worn
or damaged.
Impeller clogged.
Suction lift or discharge head too
high.
Pump speed too slow.
Check pump vacuum. Replace leak-
ing or worn seal or gasket.
Check installation and correct sub-
mergence as needed.
Check strainer and clean if neces-
sary.
Replace worn or damaged parts.
Check that impeller is properly cen-
tered and rotates freely.
Free impeller of debris.
Check piping installation and install
bypass line if needed. See INSTAL-
LATION.
Check engine output; consult engine
operation manual.
PUMP REQUIRES TOO
MUCH POWER
Pump speed too high.
Discharge head too low.
Liquid solution too thick.
Bearing(s) frozen.
Check engine output.
Adjust discharge valve.
Dilute if possible.
Disassemble pump and check bear-
ing(s).
PUMP CLOGS
FREQUENTLY
Liquid solution too thick.
Discharge flow too slow.
Suction check valve or foot valve
clogged or binding.
Discharge line clogged or restricted;
hose kinked.
Dilute if possible.
Open discharge valve fully to in-
crease flow rate, and run engine at
maximum governed speed.
Clean valve.
Check discharge lines; straighten
hose.
EXCESSIVE NOISE Cavitation in pump.
Pumping entrained air.
Pump or drive not securely mounted.
Impeller clogged or damaged.
Reduce suction lift and/or friction
losses in suction line. Record vacu-
um and pressure gauge readings
and consult local representative or
factory.
Locate and eliminate source of air
bubble.
Secure mounting hardware.
Clean out debris; replace damaged
parts.