Bennett T-75, Инструкция по эксплуатации, обслуживанию и ремонту

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Bennett T75 Operation, Service, & Parts Manual Troubleshooting
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SECTION 4: TROUBLESHOOTING
TROUBLESHOOTING
This section provides basic troubleshooting. It is not a substitute for technical training. Improper handling of equipment and/or improperly
performing the included procedures could damage your DISPENSER! Use the table in each section to determine the cause and solution. For any
additional questions, please contact Bennett Technical Support at 1-800-423-6638.
PROBLEM 1: THE MOTOR STARTS BUT THE PUMP DOES NOT DELIVER FUEL.
Refer to the table below for a description of various causes of the problem and the solution.
Cause Solution
The fuel supply is below the suction stub in the storage
tank. Fill the storage tank.
The vent pipe is plugged in the storage tank. Clean the vent pipe.
The strainer screen or filter assembly has an obstruction. Remove obstructions from the screen or filter assembly.
The bypass valve is not seating properly due to the wear
or obstruction. Check the valve for an obstruction causing the valve to stay open, and/or replace
the bypass valve.
The v-belt is loose or broken. Adjust or replace the v-belt.
There is an obstruction in the atmospheric float valve. Clean the float and valve area. Check for swelling and binding in the linkage.
The pump is out of prime. All fuel drained out of suction
line due to fault line check or foot valve. Check for a faulty foot valve in the storage tank or a faulty check valve in the
suction line.
The suction line is leaking. Start the pump and open the nozzle. If bursts of air are felt while holding a finger
on the vent tube, the suction line is damaged. Repair or replace.
The intake line, foot valve, angle check valve, or vertical
check valve has an obstruction. Connect a vacuum gauge to the ¼” plug on the filter cover. Turn the pump on and
open the nozzle. A reading of 15 or more inches of mercury with no flow indicates
a complete blockage in the suction line. Clean the line or replace.
The suction stub in the storage tank is on the bottom of
the tank. Make sure there is a three-inch clearance.
The control valve has an obstruction. Clean the control valve. It must slide freely in the valve cavity.
The nozzle is not working. Replace the nozzle.
*Two pumps are connected to one storage tank with one
suction line. There is a faulty check vale in one of the
supply lines.
* Not recommended Disconnect the vent tube on the idle pump. Install a short copper tube. Place the
end of the copper tube in a container of liquid. If the liquid is drawn out of the
container when the opposite pump is operated with an open nozzle, the line
check valve is faulty. Replace the check valve.
PROBLEM 2: THE PUMP RUNS BUT DELIVERY IS SLOW.
Refer to the table below for a description of various causes of the problem and the solution.
Cause Solution
The fuel supply level is low. Fill the storage tank.
The storage tank vent pipe is partially obstructed. Clean the vent pipe.
The strainer screen is partially plugged. Remove obstructions from the screen or filter assembly
The pump bypass valve is not seated properly. Remove and clean the strainer screen.
The V-Belt is loose. Adjust the V-Belt
The motor voltage is too low. Check the power supply voltage. Check for too many pieces of equipment on one
electrical line.
A blade or blades in the pump are worn or broken. Check the blades and replace if necessary.
An automatic nozzle has been installed. Delivery speed will be reduced by 10-25%. If maximum speed is desired, replace
with a manual nozzle.
The motor is defective. Inspect the motor for loose connections. If no loose connections are found, the
motor is defective. Repair or replace.
There is a slow leak in the suction line. Start the pump and open the nozzle. If bursts of air are felt while holding a finger
on the vent tube, the suction line is damaged. Repair or replace.
The suction line is obstructed or the foot valve, angle, or
vertical check valve is partially stuck and will not open
fully. Connect a vacuum gauge to the ¼’plug on the filter cover. Turn the pump on and
open the nozzle. A reading of 11 to 14 inches of mercury indicates a partial
obstruction in the suction line. Clean or replace the suction line components.
The pump control valve is partially stuck and will not
open fully. Remove the valve and clean thoroughly.
The nozzle check valve is sticking. Clean or replace the nozzle check valve.
The hose is defective (Flattened) Replace the hose.