Devilbiss Excel ExPro2530 ProLine 2500 - 2500 psi -- 3gpm CAT pump Model 2SFX30GZ1, 6.5 hp Honda GX engine.
3 hours use each year, 8 years old. Normal maintenance. Engine seems fine. Pump oil level is OK.
Engine starts and pump works fine for 10-20 minutes, then the water pressures stops and starts. At some point, the engine cuts off. Starts again OK after waiting 60 seconds. Works OK for ten minutes, then stops again. Unit seems to vibrate more than normal.
Probably the pump, but what can I look for or do?
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.
Pump is probably shaking more than usual due to rock, pebble, or trash in the check valves. if a valve gets hung open far enough, will make it seem as though there is no pressure at all or pump quits pumping. Valves may also be damaged due to freezing in winter time. IF engine shakes violently enough, it can cause the low oil sensor to falsly indicate low oil condition in crankcase. This may be tested by temporarily over filling the crankcase. Recommended fix, solve vibration problem.
Wish I could answer your question....but mine is doing the same thing. Changed oil, in both engine and pump. Runs for about 10 minutes and shuts down, I can restart immediately and it will run for 5 to 8 minutes and for no reason shut down. Engine does not seem to be over heating....
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th440 model number , has a 20 h.p. honda eng on it that i cant find the year on. : type code : vab2 , model gx 620 , serial # gcad-2120316 . can anyone tell me what yr. it is ?
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