Landa PHW3-11024 Operator's Manual page 25

PROBLEM
SYSTEM WILL NOT
COME UP TO FULL
DESIGNATED
PRESSURE
PRESSURE SPIKES IN
DISCHARGE LINE
DURING BYPASS MODE
UNLOADER CYCLES
WHILE IN BYPASS
MODE
POSSIBLE CAUSE
Spray nozzle worn or nozzle orifice
is too large in relation to pump flow
rate
Adjusted improperly
Bypass valve (within unloader) is
obstructed or leaking
Flow rate of pump inadequate
Pressure adjustment too tight
Restricted bypass line
Flow rate higher than 8 gpm
External leak on unloader or in
downstream fittings
Discharge valve (within the
unloader) damaged, obstructed or
worn
Weep gun is being used
Landa PHW Operator's Manual 8.917-417.0 - D
SOLUTION
See serial plate for correct nozzle size.
Readjust unloader with pressure gauge.
Remove and clean bypass cartridge or replace.
Assure designated flow rate of pump is
adequate in relation to spray nozzle size.
Call your local dealer.
Bypass line should be 1/2" inside diameter
(I.D.), 12" long and of low pressure flexible
hose.
Unloader flow rate is 7.8 gpm maximum.
Inspect all high pressure lines (including spray
gun and hose) for any signs of leakage and
repair as necessary.
Inspect and replace as necessary.
The unloader is not designed for use with a
weep gun.
Maintenance
25