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Symptom
Pump does not prime
Loss of pump pressure
Pump will not turn
Pump hydraulic system overheating
Parking brake will not hold
Erratic spray output—overapplying and
underapplying
WSC55 SERIES CHEMICAL SPRAY CART • OPERATION AND PARTS MANUAL — REV. #1 (08/30/19) — PAGE 45
TROUBLESHOOTING (SPRAY CART)
Troubleshooting (Spray Cart)
Possible Problem
Leak in suction line?
Obstruction in suction line?
Suction hose sucked to bottom or side of
tank?
Rollers stuck in pump?
Pump seals leaking air?
Pump turning in wrong direction?
Clogged suction strainer?
Kinked or blocked suction hose?
Air leak in inlet side plumbing?
Relief valve setting too low or weakened
spring?
Faulty gauge?
Pump seals leak air?
Nozzle orifi ces worn?
Pump worn?
Corrosion (rust), scale or residue?
Solid object lodged in pump?
Insuffi cient hydraulic hose size?
Brake linkage out of adjustment?
Worn or damaged spray tip?
Solution
Check hose and fi ttings for leaks and correct.
Inspect hose for obstructions such as debris
or loose inner liner and remove from the line.
Cut a notch or "V" in end of suction hose.
Disassemble pump and inspect rollers.
Replace seals.
Correct rotation of pump.
Check strainer and clean regularly.
Inspect suction hose and repair as necessary.
Check hose and connections for leaks. Use
pipe joint sealant and retighten connections.
Check relief valve and correct setting or
replace spring.
Replace gauge.
Replace seals.
Replace nozzles.
Repair pump.
Replace pump.
Disassemble pump and remove object.
Check hydraulic hose size. Hose should be
at least 1/2" (13 mm). For large open-center
systems, hose should be 3/4" (19 mm).
Inspect brake linkage. Adjust linkage
fasteners as necessary.
Replace spray tip.
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