Landa MHP4 30324E Operator's Manual page 22

Maintenance
PROBLEM
Incoming water to machine warm or hot
Fuel pump pressure too high
Fuel pump defective
WATER
Detergent line sucking air
TEMPERATURE
Defective high limit switch
TOO HOT
Incorrect fuel nozzle size
Insufficient water supplied
Restrict water flow
Air leak
Valve in the injector head may be blocked,
dirty or damaged
DETERGENT NOT
Filter screen on detergent suction hose
plugged.
DRAWING
Dried up detergent plugging metering valve Disassemble and clean thoroughly.
High viscosity of detergent
Hole in detergent line(s)
Low detergent level
Pump sucking air
PUMP RUNNING
NORMALLY
Valves sticking
BUT PRESSURE
Unloader valve seat faulty
LOW ON
Nozzle incorrectly sized
INSTALLATION
Worn piston packing
Valves worn
Blockage in valve
Pump sucking air
Worn piston packing
FLUCTUATING
PRESSURE
Gasoline Engine Altitude
22
POSSIBLE CAUSE
Landa MHP Operator's Manual 8.913-925.0 - T
SOLUTION
Lower incoming water temperature.
Call local Landa Dealer for proper fuel pressure.
Replace fuel pump.
Tighten all clamps.
Check detergent lines for holes.
Replace.
See breakdown for model.
Check water GPM to machine.
Check nozzle for obstruction and proper size.
Tighten all clamps. Check detergent lines for
holes.
Clean or replace valve in injector.
Clean or replace.
Dilute detergent to specifications.
Repair hole.
Add detergent, if needed.
Check water supply and possibility of air
seepage.
Check and clean or replace if necessary.
Check and replace if necessary.
Check and clean or replace if necessary.
(See serial plate for proper size.)
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check water supply and
air seepage at joints in suction line.
Check and clean or replace if necessary.
The gasoline engine is preset for operation at
altitudes below 1000 feet above sea level. If
operated at higher altitudes, it may be necessary
to install a high altitude main jet in the carburetor.
Contact your local authorized engine sales and
service center for details.