Troubleshooting; Mechanical/Fluid Flow - Graco ToughTek S340e Operation, Repair, And Parts

Troubleshooting

Troubleshooting Troubleshooting Troubleshooting
1. Perform Pressure Relief Procedure, page
Mechanical/Fluid

Mechanical/Fluid Flow

Mechanical/Fluid Flow Flow
Problem Problem Problem
Displacement pump operates,
but output is low on upstroke
Displacement pump operates,
but output is low on down
stroke and/or on both strokes
Material leaks and runs over
the side of the wet cup
Fluid delivery is low
Electric motor does not operate
Sprayer does not operate
Erratic accelerated speed
Cycles or fails to hold pressure
at stall
Poor finish or irregular spray
pattern
Motor powered but nothing
comes out of hose
24
All manuals and user guides at all-guides.com
21.
Cause Cause Cause
Piston ball check not seating
properly
Piston worn or damaged
Piston packings worn or damaged
Outlet check valve not seating
properly
Intake valve ball check not seating
properly
Rubber elbow air leak
Fluid hose on the applicator is
obstructed
Loose wet cup
Throat seal worn or damaged
Applicator tip/gun is dirty or clogged Clean or replace tip/gun.
Clamps on hopper elbow are loose Tighten clamps on the hopper elbow.
Large pressure drop in fluid hose
Power switch is not ON
Tripped circuit breaker
Fluid hose or applicator obstructed Clean the hose or application.
Dried fluid on displacement rod or
inlet ball
Material supply exhausted, clogged
suction
Open or worn piston ball
Open or worn intake valve
Worn check balls, seats, or piston
packing
Inadequate atomizing air pressure
Dirty, worn, or damaged spray
applicator
Pump is packed out with dry or
cured material
Hose is packed out with dry or
cured material
2. Check all possible problems, causes, and
solutions listed below before disassembling
pump.
For troubleshooting and repair questions, please
contact your distributor.
Solution Solution Solution
Service the piston ball check.
Replace the piston.
Replace piston.
Clean the check valve.
Service the intake valve ball check.
Tighten clamps on the rubber elbow.
Clean the fluid hose on the applicator.
Tighten the wet cup enough to stop leakage.
Replace the throat seal.
Reduce length or increase diameter.
Turn the power switch ON.
Check circuit breaker at power source. Reset motor
switch.
Clean rod. Always stop pump at bottom of stroke;
keep wet cup filled with TSL. Be sure the inlet ball
moves freely.
Refill the hopper and the prime pump.
Clear piston valve; service the piston ball check.
Clear or service intake valve.
Service the pump lower.
Adjust air needle valve on applicator (see applicator
manual).
Service spray applicator (see applicator manual).
Disassemble and Clean the pump.
Try to flush the hose using water hose and/or
polyurethane tube.
3A3437F