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22
PUMPING SYSTEM
Problem Probable Cause Remedy
Pump runs but has low
spray pressure
Nozzle not installed Install proper sized nozzle
Dual wand valve is open Dual wand valve must be
closed and high pressure
nozzle installed
Leaky discharge hose or
quick coupler
Replace hose, quick coupler,
or O-ring in the quick coupler
Inlet strainer clogged Clean and check more
frequently
Worn or wrong size nozzle Replace nozzle of proper
size
Belt slippage Tighten or replace with
correct belt
Unloader valve worn or
improperly adjusted
Install pressure gauge
on pump head to adjust
pressure. Check valve seat
on Unloader
Air leak in inlet plumbing Reseal fittings and inspect
inlet hoses for air leaks
Pump runs but there is
erratic, fluctuating pressure
Inadequate incoming water
supply
Increase water supply flow
Stuck inlet or discharge
valves
Clean out or replace worn
valves
Restricted inlet or air entering
the inlet plumbing on the
pump
Check fittings and hose
for air tight seal, clean inlet
strainer screen
Leaking H.P. seals Replace seals
Leaking L.P. seals Pressure feed the pump and
replace L.P. seals if water
leaks from the pump head
Excessive crankshaft play
or loud, knocking noise in
pump
Broken or worn bearing or
connecting rod in crankcase
Replace pump or bearing
Oil leaking from pump Loose drain plug or
damaged seal
Locate point of oil leakage
and replace damaged O-ring
or seal
Leaking crankshaft oil seal Replace seal
Leaking Oil Sight Glass seal Replace seal
Leaking Piston Oil Seal Replace seals. Install correct
amount of oil in pump
Inlet injection will not
siphon chemical
Check valve in strainer
clogged
Clean or replace. Rinse after
each use
Chemical valve not open or
clogged
Open chemical valve or clean
Strainer not submerged in
solution
Submerge strainer and
replenish chemical
Detergent hose cut or kinked Inspect hose, replace as
necessary
Water is emitted from the
chemical pickup tube
Check valve malfunctioning Repair or replace check
valve
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