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Troubleshooting
8 311628C
Troubleshooting
Problem Cause Solution
Motor runs but pump will not prime. Motor rotation wrong. (12 VDC units
only.)
Check wiring instructions for possible
problems.
Missing relief valve o-ring seal (4c). Remove gear cover (1b) inspect seal
(4c), replace if missing or damaged.
Sheared drive key (1g). Remove cover (1b) and inspect key
(1g/10b), replace if worn or sheared.
Dirt under relief poppet (4a) or seal
(4c).
Remove cover (1b) and inspect,
clean or replace if damaged.
Strainer seal (3d) leaking. Inspect and replace if damaged.
Suction height too high to prime. See Priming Pump, page 5.
Worn or damaged gears. Remove cover (1b) and inspect
gears. Replace if worn or damaged.
Fluid level low. Refill tank.
Cover seal (1f/10c) damaged. Replace if worn or damaged.
Inlet strainer (3b) clogged. Remove and clean or replace.
Air leak in suction tube. Inspect all joints in suction tube,
make sure all joints have sealant
applied.
Air lock in system. This may occur if filter or meter or
automatic shut-off nozzle is used. If
this occurs, fill pump and meter with
herbicide through top of pump.
Motor does not run at proper speed. Check electric connections. Check
supply voltage for proper voltage
level.
Unit pumps but output flow is low. Clogged inlet strainer (3b). Clean or replace.
Air leak in suction tube. Check to make sure all joints in suc-
tion tube are sealed.
Suction tube too close to tank
bottom.
Suction tube must have a 2 in.
(51 mm) minimum clearance.
Tank empty. Refill tank.
Tank not vented. Tank must be vented to atmosphere.
Worn or damaged gears. Remove cover (1b) and inspect
gears. Replace if worn or damaged.
Damaged motor. Replace motor.
Clogged suction tube, hose, or
nozzle.
Inspect and clean.
Motor stalls when nozzle is closed. Bypass relief valve (4a) stuck. Inspect relief valve, making sure
poppet is free. Replace if damaged.
Low supply voltage. Check supply voltage.
Gears (1c/10a) damaged and
binding.
Inspect gears. Gears should turn
freely. Replace if damaged.
Faulty motor. Replace motor.