20
Maintenance
Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW ON
INSTALLATION
Pump sucking air
Check water supply and possibility of air
seepage.
Valves sticking
Check and clean or replace if necessary.
Unloader valve seat faulty
Check and replace if necessary.
Nozzle incorrectly sized
Check and replace if necessary (See serial
plate for proper size).
Worn piston packing
Check and replace if necessary.
FLUCTUATING
PRESSURE
Valves worn
Check and replace if necessary.
Blockage in valve
Check and replace if necessary.
Pump sucking air
Check water supply and air see page at joints
in suction line.
Worn piston packing
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 clean if necessary.
Excessive matter in valves
Check and clean if necessary.
Worn bearings
Check and clean if necessary.
PRESENCES OF WATER
IN OIL
Oil seal worn
Check and replace if necessary.
High humidity in air
Check and change oil twice as often.
WATER DRIPPING FROM
UNDER PUMP
Piston packing worn
Check and replace if necessary.
O-Ring plunger retainer worn
Check and replace if necessary.
Pump protector
Reduce inlet water pressure. Do not close
trigger on spray gun for longer than 1-2
minutes.
OIL DRIPPINGS
Oil seal worn
Check and replace if necessary.
MACHINE SMOKES
Improper fuel or water in fuel
Drain tank and replace contaminated fuel.
Improper air adjustment
Readjust air bands on burner assembly.
Low fuel pressure
Adjust fuel pump pressure to specifications.
Weak fuel pump
Check fuel pump pressure. Replace pump if
needed.
Fuel filter partially cogged
Replace as needed.
Soot build up on coils
Clean coils with soot remover.
Lime build up in coils
Clean inside of coils using Landa's coil cleaner.
Improper burner nozzle
See combustion assembly breakdown
Landa HOT Series Operator’s Manual 8.917-208.0 - B
