Landa ZG3-20321, Operator'S Manual

Page: 11 / 22

ZG SERIES PRESSURE WASHER
OPERATOR’S MANUAL
11
LANDA ZG • REV. 5/02
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
LOW OPERATING
PRESSURE
Faulty pressure gauge Install new gauge.
Insufficient water supply Use larger supply hose; clean filter at water
inlet.
Old, worn or incorrect spray
nozzle
Match nozzle number to machine and/or replace
with new nozzle.
Plumbing or hose leak Check plumbing system for leaks. Retape leaks
with teflon tape.
Faulty or misadjusted unloader
valve (where applicable)
Adjust unloader for proper pressure. Install
repair kit when needed.
Worn packing in pump Install new packing kit.
Fouled or dirty inlet or
discharge valves in pump
Clean inlet and discharge valves.
Worn inlet or discharge valves Replace with valve kit.
Leaking pressure control valve
(where applicable) Rebuild or replace as needed.
Slow engine RPM Set engine speed at proper specifications
(approx. 2800 RPM - 3400 RPM).
FLUCTUATING
PRESSURE
Valves worn Check and replace if necessary.
Blockage in valve Check and clean out if necessary.
Pump sucking air Check water supply and suction line for air
seepage at joints.
Worn piston packing Check and replace if necessary.
PRESSURE LOW
AFTER PERIOD OF
NORMAL USE
Nozzle worn Check and replace if necessary.
Inlet or discharge valves
blocked or worn Check and clean or replace if necessary.
Unloader valve seat worn Check and replace if necessary.
PUMP NOISY Air in suction line Check water supply and connections on suction
line.
Broken or weak inlet or
discharge valve springs
Check and replace if necessary.
Foreign matter in valves Check and clean if necessary.
Worn bearings Check and replace if necessary.
Excessive temperature of liquid Reduce to below 75 o C (180 o F).