18
Maintenance
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.
Belt slippage Tighten or replace; use correct belt.
Plumbing or hose leak
Check plumbing system for leaks. Re-tape leaks with
teflon tape.
Faulty or mis-adjusted unloader
valve
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.
Obstruction in spray nozzle Remove obstruction.
Leaking pressure control valve Rebuild or replace as needed.
Slow engine RPM Set engine speed at proper specifications.
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.
BURNER
WILL NOT
LIGHT
Little or no fuel Fill tank with fuel.
Improper fuel or water in fuel Drain fuel tank and fill with proper fuel.
Clogged fuel line Clean or replace.
Plugged fuel filter Replace as needed.
Mis-adjusted burner air bands Readjust air bands for clean burn.
Little or no fuel pressure from fuel
pump
Increase fuel pressure to specification and/or replace
fuel pump. Test with pressure gauge.
Faulty burner transformer
Test transformer for proper arc between contacts.
Replace as needed.
30 amp circuit breaker tripped Push reset button
Bridge rectifier defective Test and replace
12 VDC relay defective Test and replace
(continued on next
page)
Disconnected or short in electrical
wiring
All wire contacts should be clean and tight. No
breaks in wire
Landa PGDC Operator’s Manual 8.916-596.0 - P
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