Gorman-Rupp Pumps VG5C3-B 1188885 and up - Manual (Page 19)

VG‐SERIES OM-02816
TROUBLESHOOTING PAGE D - 2
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE (cont.)
PUMP REQUIRES
TOO MUCH
POWER
PUMP CLOGS
FREQUENTLY
Pump speed too slow. Check driver output; check belts
or couplings for slippage.
Suction lift too high. Measure lift w/vacuum gauge. Re­
duce lift and/or friction losses in
suction line.
Pump speed too high. Check driver output; check that
sheaves or couplings are cor­
rectly sized.
Discharge head too low. Adjust discharge valve.
Liquid solution too thick. Dilute if possible.
Bearing(s) frozen. Disassemble pump and check
bearing(s).
Discharge flow too slow. Open discharge valve fully to in­
crease flow rate, and run power
source at maximum governed
speed.
Suction check valve or foot valve
clogged or binding. Clean valve.
EXCESSIVE NOISE Cavitation in pump.
Impeller clogged or damaged.
Pump or drive not securely mounted.
Pumping entrained air.
Reduce suction lift and/or friction
losses in suction line. Record vac­
uum and pressure gauge readings
and consult local representative or
factory.
Locate and eliminate source of air
bubble.
Secure mounting hardware.
Clean out debris; replace dam­
aged parts.
Leaking or worn seal or pump gasket. Check pump vacuum. Replace
leaking or worn seal or gasket.
Discharge throttling valve partially
closed; check that valve is installed im­
properly. Open discharge valve fully; check
piping installation.
Liquid solution too thick. Dilute if possible.
Power source too small. Check power requirement for ap­
plication. Install larger power
source.
Impeller jammed due to debris or in­
sufficient clearance. Disassemble pump and check im­
peller.
Suction and discharge lines not prop­
erly supported. Check piping installation for proper
support.