18
Maintenance
PROBLEM
POSSIBLE CAUSE
SOLUTION
WATER ESCAPING
FROM FILL PIPE ON HEAT
EXCHANGER
Cold water added to heat exchanger
Will stop once at operating
temperature.
Ruptured coil or leaking
Check, repair or replace fittings.
UNLOADER DOES
NOT GO INTO
BYPASS OR
WILL CYCLE ITSELF
Spray gun or hose is leaking
to atmosphere
Check and repair all leaks.
Check plunger either did not move or
did not seal
Remove discharge port. Clean and
inspect the check plunger.
Replace the O-ring if needed.
Actuator O-ring failure
Remove actuator plunger assembly and
inspect O-ring and back-up rings. Replace
if necessary.
SPIKES
TOO HIGH
Slow moving actuator; this may be
caused by bad O-rings either on the
plunger or inside the actuator fitting
Remove the actuator assembly to inspect
the O-ring and back-up rings. The actuator
assembly will have to be disassembled to
inspect and/or replace the O-rings in the
actuator fitting.
Spring tension
Adjustment should stop when pressure is
no longer affected by further
compression of the spring.
Hose length
Hose length can affect the amount of
spike pressure. Long lengths of hose may
cause high spike pressures.
SYSTEM WON’T
COME UP
TO PRESSURE
Water is leaking between ball
and seat
Disassemble inlet fitting and check
for contaminates or worn parts.
Clean or replace as needed.
Cs on actuator plunger
are bad
Remove actuator assembly and
inspect O-ring and back-up rings.
Replace if necessary.
Locknut may be improperly set
Readjust locknut.
NOTE:
The locknut is inside the spring on
models that have the stem exposed above
the spring.
Tip/GPM combination is incorrect
Check actual GPM on unrestricted pump
and size tip accordingly.
Tip worn- the GPM may be greater than
expected with a worn tip
Replace tip.
Bad gauge - the pressure may
be higher than the gauge shows
Replace gauge.
Landa EHW Operator’s Manual 8.941-114.0 - M