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20
TROUBLESHOOTING PRESSURE ISSUES
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 LP
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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