32
PHW SERIES PRESSURE WASHER
OPERATOR’S MANUAL
LANDA PHW • 9/02
UNLOADER
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
SYSTEM WILL NOT
COME UP TO FULL
DESIGNATED
PRESSURE
Spray nozzle worn or nozzle
orifice is too large in relation to
pump flow rate
See serial plate for correct nozzle size.
Adjusted improperly Readjust unloader with pressure gauge.
Bypass valve (within unloader) is
obstructed or leaking
Remove and clean bypass cartridge or replace.
Flow rate of pump inadequate
Assure designated flow rate of pump is adequate
in relation to spray nozzle size.
PRESSURE SPIKES IN
DISCHARGE LINE
DURING BYPASS
MODE
Pressure adjustment too tight Call technical support.
Restricted bypass line
Bypass line should be 1/2" inside diameter (I.D.),
12" long and of low pressure flexible hose.
Flow rate higher than 8 gpm Unloader flow rate is 7.8 gpm maximum.
UNLOADER CYCLES
WHILE IN BYPASS
MODE
External leak on unloader or in
downstream fittings
Inspect all high pressure lines (including spray gun
and hose) for any signs of leakage and repair as
necessary.
Discharge valve (within the
unloader) damaged, obstructed
or worn
Inspect and replace as necessary.
Weep gun is being used The unloader is not designed for use with a weep
gun.
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