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18 John Deere Operator's Manual
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE REMEDY
Engine will not start. Various engine problems. Refer to the Engine Manual
accompanying your unit.
Unit components are frozen. Allow to thaw. If any part of the unit
becomes frozen; excessive
pressure may build up in the unit
which could cause the unit to burst
resulting in possible serious injury to
the operator or bystanders.
No discharge at nozzle when Inadequate water supply. Ensure hose is 3/4" diameter and
trigger mechanism is squeezed. incoming water supply is turned on.
Low or uctuating pressure. Kink in water inlet hose. Remove kink.
Kink in high pressure discharge hose. Replace kinked high pressure hose.
Water inlet screen obstructed. Remove screen, clean or replace.
Pump sucking air. (Prime eliminated) Tighten all water intake connections
Eliminate leaks in intake line.
Adjustable Grip on Dual Lance Turn grip counterclockwise to
is not in high pressure mode. to high pressure.
Obstructed or worn spray nozzle. Remove, clean or replace.
Damaged or obstructed valve assy. Remove, inspect, clean or replace.
on pump.
Pump packings worn. Replace packings.
Unloader/Bypass valve not operating Repair or replace.
correctly.
Water is leaking from Heat DumpValve. Water temperature is too high. Do not allow unit to operate in
bypass mode (with the trigger gun
closed) for more than three minutes.
Defective valve. Replace.
Oil appears milky or foamy. Water in oil. Change pump oil. Fill to proper
level.
Oil leaking from unit. Worn seals or o-rings. Contact Service.
Detergent will not siphon into Detergent strainer is not completely Check, submerge if necessary.
Low Pressure Detergent mode. submerged in detergent solution.
Detergent strainer obstructed. Inspect, clean or replace.
Detergent hose cut, obstructed or Inspect, clean or replace.
kinked.
Detergent adjusting knob turned to Open adjusting knob. Refer to
closed position. "Cleaning with Detergents" pg. 17.
Adjustable grip on dual lance is Turn grip clockwise to move to low
not in low pressure mode. pressure.
Nozzle assembly is plugged. Clean or replace.
Too many high pressure hose Use one extension maximum.
extensions attached to the water outlet.
Ball & Spring in Venturi stuck. Remove, clean or replace.
Water ows back into detergent Ball & Spring in Venturi reversed, Remove, clean or replace.
container. missing or corroded.
Water ows from the nozzle when the Trigger gun is malfunctioning. Repair or replace.
trigger gun is locked in the "OFF"
position.