Question about Karcher 2500 PSI Pressure Washer

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Engine runs fine but unit won't pump water.

Devilbiss Excell EXH 2425 - unit is 6 yrs old with about 12 to 16 hours of run time. Pump oil level is normal, never had to add. The few times used just prior to failure, the unit seemed to take much longer to initiate the pressure spray ( kind of like a self priming pump with loose seals on the suction side). I have always made certain that water was flowing through the unit and out the spray nozzle prior to starting the engine.

I have since carefully removed the brass end plate and have confirmed that all three pistons move in and out when I pull the recoil rope, so it seems apparent that all is well on the front end. All ''O'' rings appear to be in good condition. What's up with this thing. I know these things don't have the best reputation for long life but 16 hours ? really.

Can anyone offer some advice on what else I might look for?

Steve


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Hi and welcome to FixYa. I am Kelly

I am not sure which pump you have but there was one that was a real piece of **** and has since been discontinued due to a VERY SHORT service life.

This is going to sound odd... but tap with some conviction on the power head using a hammer and a "hard block" of wood with the unit static and then again with the engine at low speed. Your attemting to losen the check valve balls in the pressure head that sometimes get corrosion in the ball seat. Then test the output pressure. If your pump has a pressure output adjustment (black knob 3.5 inches long / high with a brass knurled lock nut under it) then losen the lock nut and back the adjustment off substantially and re-test pressure. Once you have output pressure return it to the previous position.

You have a 50 - 50 chance of getting your pressure back by doing the above steps.

Kelly

Posted on May 03, 2010

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6ya6ya
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Posted on Jan 02, 2017

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2006 vw passat


First check the oil level, this engine has a low oil shut down feature. Also the oil pressure sending unit (signal for the oil light) Is electrically Interlocked (signal, Fuel pump relay) for fuel pump run.

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What is your model #
http://www.ppe-pressure-washer-parts.com/excell-devilbiss-pressure-washer-replacement-pump-parts

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How to replace the water pump on a 1992 geo tracker 1.6 liter engine


Water Pump - REMOVAL & INSTALLATION
During these procedures, identify all components removed from the engine so that they may be reinstalled in their original positions. If discarding the old components so that new components can be installed, identifying the old items is not necessary.


1.3L and 1.6L Engines

  1. Remove the timing belt cover, timing belt, tensioner, plate and spring.
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  3. Remove the one (1.6L MFI engines) or two (1.3L and 1.6L TFI engines) small rubber seals from between the water pump and the oil pump, and the water pump and the cylinder head.
  4. If necessary for clearance, remove the oil level dipstick tube retaining bolt from the engine block and the alternator adjusting brace.
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Fig. 1: Exploded view of the water pump mounting

WARNING Do NOT use a prybar between the water pump housing and the engine block to separate the two components; this can cause scratches and/or gouges, which can prevent proper sealing.
  1. Pull the water pump off of the engine block. If the water pump is difficult to remove from the engine block, use a soft-faced mallet to tap the water pump housing until it loosens.
Do not disassemble the water pump; if the water pump is damaged or defective, the entire unit is replaced.
  1. Thoroughly clean the water pump gasket mating surfaces of old gasket material and corrosion.
To install:
  1. Along with a new gasket, install the water pump on the engine block. Tighten the water pump mounting bolts to 88-115 inch lbs. (10-13 Nm).
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Hope helps (remember comment and rated this).

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1 Answer

1975, 7.5 Kohler marine genset, runs only with the reset depresed


Can't search for a manual without model, type, serial, etc numbers...

A few things to take a look at:

1) Oil level / pressure sending unit. This is normally bypassed as long as the start switch is pressed. When engine starts, and switch is released, engine will die if sending unit is defective, or you are low on oil.

2) Exhaust temperature sensors. Older units were notorious for burning these up.

3) Cooling Water Temperature sensor. These cause trouble often, but mostly due to water pump impeller being eaten away by galvanic action and not able to pump water as effecively. End result is water temp higher than normal, which trips the switch, which kills the engine.

4) Alternator (generator) output not as it should. If output doesn't rise to proper level within a few seconds of engine start, the engine will be shut down.

5) Choke not working as it should

6) Bad fuel, bad fuel pump, clogged fuel filter.

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1 Answer

Engine runs fine. no water pressure.


These pumps are notorious for seasonal problems.
Tip the unit to the point you can pour engine oil into the water inlet connection. What your attempting to do is free up the ball seats in the pump. They get corroded when they sit and lock in place. Adding the oil or a vast amount of WD 40 to the water inlet often does the trick for loosening up the seat balls and springs.
After you add the oil (3 - 4 ounces) or WD 40 to the water inlet line just slowly pull the engine through with the ignition switch off. As the water inlet cavitates add more oil.
Let it sit over night and then take a block of wood and a hammer and tap on the power head. Don't over do it and do it in such a manner your not going to shear off any bolts or break anything. But... be serious with the hammer and block of wood.
Then connect inlet water hose, the pressure hose and test the unit. You may want to purge the oil lubricant into a bucket before you start the engine.
Give it a try and see what happens.

Thanks for using FixYa,
Kelly

Apr 16, 2010 | Devilbliss DeVILBISS Devap DVH2600...

2 Answers

Motor seems to be locked up!!!!!!!!


It may be your engine, but it may also be the water pressure. Try this: Hold the trigger down while pulling the recoil starter. This acts as an unloader for the pressure washer, and may allow the engine to turn over. There is also an oil level in the pump as well as the engine. Check both levels.
Just a thought, but I've been there. Best regards, W/D

Aug 16, 2009 | Devilbliss DeVILBISS Devap DVH2600...

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Pressure Washer Pump and Engine Stops Suddenly


The pump might be binding against the motor, causing the pump to overheat and temporarilly "seize up" and shut the engine off.
After cooling down for a brief period (5~10 mins) the engine can usually be re-started, but the overheating problem will keep coming back.

This happens when the pump either wasn't seated against the engine properly during it's initial instalation, or the pump housing wasn't machined properly and the PTO shaft is trying to drive the pump at a slight angle = excessive friction = overheating.

Try this:
1) Loosen the bolts that mount the pump to the engine just enough so that the pump can be wiggled slightly.
2) With the engine power switch in the "OFF" position, slowly pull the recoil starter rope so that the engine / pump completes about two revolutions. This helps to align the pump surface with the engine.
3) Lightly snug the pump mounting bolts in a criss-cross pattern, then slowly pull the recoil starter rope again to ensure that the pump isn't binding.
4) Finish tightening the pump mounting bolts in the criss-cross pattern (approx. 21 foot pounds torque).

The entire process should take you roughly about 10 mins from start to finish.

If this doesn't remedy your problem, then try running the engine for 20 mins with the pump COMPLETELY removed so as to isolate the components.

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Fuel pump not staying on 1993 k1500 350


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Engine problem.


Hi Michael,

The motor shut off and the engine light came on, you won’t start right away and you wait a couple of days and start it again, sounds like your engine was over heated and because it is too hot and the engine frozen.

There are several kinds of engines, water cooling ,oil cooling and air cooling.

Over heated can cause many different problems for the cars, you should check step by step yourself.

Water cooling engine; if you know, you can help somebody.


1. Check the radiator see if you have enough coolant
2. Check the oil see if you have enough oil
3. check the water pump see if the water pump works fine
4. check the thermostat see it is function right.


Suppose your radiator has water or coolant, leave your radiator cap open, start your engine, let it is running 10 to 15 minutes and wait it is getting hot and see the water in your radiator, if the water moves, that means your cooling system works fine, otherwise either the thermostat frozen or the water pump was broken.

You mentioned when you re-start your car, sounds like a diesel engine, please check the where the noise from, if the noise from the water pump area, that means you need to change the water pump. When you change the water pump, change the thermostat at the same time, because when the engine over heated, the thermostat maybe damaged.

Oil cooling engine, check the oil pump. If the noise from the oil pump, you need change it.


Good luck,

Frank

Jun 05, 2008 | 1992 Volkswagen Jetta

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