Craftsman 919.670280, D20590 owner manual Troubleshooting, Symptom Cause Solution

TROUBLESHOOTING

SYMPTOM	CAUSE		SOLUTION
Engine won’t	1.	Engine throttle is in "OFF" Position.	1.	Slide throttle to "Run" position.
start	2.	Choke lever has not been placed to	2.	Slide choke lever to choke position.
		choke.	3.	Depress trigger gun.
	3.	Pressure buildup after initial use.
Won’t Draw	1.	Adjustment knob on soap nozzle is	1.	Turn knob counterclockwise for more soap (+).
Chemical		turned fully clockwise for less soap (-).	2.	Check chemical screen; clean if obstructed.
	2.	Chemical screen is obstructed.
	3.	Chemical screen not working.	3.	Make sure chemical screen is submerged in
				chemical/water.
	4.	Chemical injector orifice obstructed	4.	Check and clean.
		or stuck.
Pump running	1.	Water supply restricted.	1.	Check water supply and filter screen for
normally but				blockage. Check hoses for blockage, kinks,
pressure does				leaks, etc.
not achieve rated	2.	Adjustment knob on soap nozzle is	2.	Turn knob counterclockwise for more soap (+).
values		turned fully clockwise for less soap (-).	3.	Check and replace.
	3.	Nozzle incorrect or worn.
	4.	Pump sucking air.	4.	Check that hoses and fittings are airtight.
	5.	Nozzle blocked.	5.	Clean nozzle.
Fluctuating	1.	Pump sucking air.	1.	Check that hoses and fittings are airtight. Purge air
Pressure				from garden hose.
	2.	Garden hose inlet strainer clogged.	2.	Clean. Check filter frequently.
	3.	Worn Seals or Packing.	3.	Check and replace.
	4.	Inadequate water supply.	4.	Check hose for kinks.
	5.	Fouled or dirty inlet or discharge	5.	Check flow available to pump. Check for
		valves.		excessive heat, 145O F or above.
	6.	Leaky discharge hose.	6.	Clean inlet and discharge valve assemblies.
				Replace if damaged.
Pressure drops	1.	Nozzle clogged, partially obstructed.	1.	Check connection. Replace if cracked or
after period of				punctured.
normal use	2.	Nozzle worn.	2.	Clean or replace.
	3.	Valves worn, dirty or stuck.	3.	Check and replace.
	4.	Worn piston packing.	4.	Check and replace.
Pump noisy	1.	Water too hot.	1.	Reduce temperature below 63O C or 145O F.
	2.	Pump sucking air.	2.	Check that hoses and fittings are airtight.
	3.	Valves dirty or worn.	3.	Check, clean or replace.
	4.	Worn bearings.	4.	Check and replace if necessary.
Presence of	1.	High humidity.	1.	Change Oil.
water in oil (oil	2.	Piston packing and oil seal worn.	2.	Check and replace oil seals.
milky);
Water dripping	1.	Fittings Loose.	1.	Tighten.
from pump	2.	O-rings of piston guide or retainer	2.	Check and replace.
		worn.	3.	Check and replace.
	3.	Piston packing worn.
Oil Dripping	1.	Oil seal worn	1.	Check and replace
	2.	Loose drain plug or worn drain plug	2.	Tighten drain plug or replace o-ring. Do not over
		o-ring.		torque.

D20590 16-ENG