Looking inside the Ryobi P737 18v Tire Inflator - Repairing and Designing a Replacement Cooling Fan 

I just opened mine today! All my fan blades blew off like yours but my piston actually cracked in half. Gonna JBWeld and send it.

I got one recently and it appears updated with a digital meter. Maybe they worked out the fan issue as well. Very good work you did there.

Excellent! Thank you for taking the time to disassemble this unit. My hose just blew out, and I'm sure it's due to the heat and me being impatient and ignoring the duty cycle. I was going to replace the hose but may just purchase the updated pump; these really come in handy in a pinch if your tire is low (even though it takes forever!). I'll be watching future videos-good luck!

Thanks for the teardown, though it confirmed what I suspected already, that it is more or less of a joke with single-digit CC's displacement, plastic parts, and open sintered bushings, no head heatsink, basically made as cheaply as possible besides the molded casing. There is a certain satisfaction in repairing things, especially if you can make them better than new, but in this case even if we assumed it was as good as new again, it simply was not worth the bother. It is strange to me that manufacturer aren't making larger inflators, thinking we'd all like to wait several minutes just to inflate a car tire, when a bigger motor and 5X larger cylinder would not have cost them much. I know Ryobi has the P731 but it is also an example of a ridiculously small compressor in a fancy plastic case. Nobody wants to pay for or drag around their tanked air compressor just to inflate things, instead they should make something similar to a Viair 88P but with an 18V motor and integral battery shoe. This is technically possible as the 88P is only 20A @ 12V so a similar HP motor at 18V would be well within the current capacity of the battery. They could even one-up it and use a brushless motor, probably get the current down to 10A which is sustainable.

The fan in my Ryobi P737 is intact but loose inside the housing as though it had never been installed on the shaft. The large gear is not straight so I think the center of the gear has been worn down. Maybe I'll keep this to use for another inflator if other parts need replacing.

Where can I buy the valve end pisto ring for mine it broke and won’t pump air anymore? Pls HELPPPPP

I have a new one it blows HOT AIR and the hose gets very hot to touch after 3-5 mins was yours the same?

The reason that the fan may have self destructed is because a piece of solid debris got into one of the side vents. It got caught between the fan blade and possibly the side wall, which cause the fan to fetch up. A nice hack for that might be to install a bit of filter material that you might see on a lawnmower air filter. Cut and glue it to the inside of the vent. Make sure it's clear of any moving parts, and keep in mind that it's something you'll have to clean. I don't know if it would work for certain, but it's an idea worth exploring.

Mine started making horrible grinding and cracking noises so I assume my fan is also shot. I am debating just tossing it as i have their 1 gallon compressor for inflating tires...

That rubbery ball is a check valve

😊great video.what size is that e-clip retainer?that holds down the piston in place?

hi pal i have the same one but the problem is my hose got damaged so needed advise as to what sort if clip i need ti attached as the metal clip i have had to be removed need yr advise thanks

Just opened mine up and it looks like the rubber pistol ring disintegrated. Have you happened to replace and know the size. I was trying to find an assortment but didn’t seem to. I’ve never changed one but it seems pretty straight forward. I definitely prefer to not just throw things away. You made mention that it is a valve as well. Maybe has to be purchased from ryobi. Anyways great video. Thanks!

I got a problem that can not hold on high pressure. I think it's cause of piston seal. don't know where can get replacement.

I burned up one, was going to try and fix it, but heck at $20 I just bought a new one. What I hate about these is they are "trigger happy". You just touch them and the trigger goes off, annoying and startling me. I want to add an 'enable' switch, and heck it also needs to keep the trigger on, I use a ziptie for that. I'd pay another $5 if they had these features. So basically it needs to add a off-on-trigger switch on it.

If I ignored the duty cycle and harmed the motor, is there a motor I can buy to replace a one abs maybe get better performance. I want to stay analog and not go digital. Thanks

I need a fan blade cannot 3D print no pattern is there anything that will substitue from another manufacture???????????????

Had mine apart today. Fan was intact but moved up the shaft and bound against the bottom of the motor- added a spacer to prevent this from happening again. The bigger problem is that the center of the large gear is worn, causing it to get out of sink with the motor drive gear. Almost like a bushing would keep it at 90 degrees-any suggestions?

My fan broke also and in the process of refurbishing it now, but I'm also wondering why it broke, other than it's about fi years old!

I was very curious 🧐

You mentioned that the gauge needed replaced. Did you ever do that? If so, what replacement gauge did you use for it?

I got a used one for cheap that seems to spin the motor and screach but not pump above a certain pressure

Mine has the same problem and the gears worn down a bit. I am going to try petroleum jelly instead.

Have the same issue,was wondering by any chance if you can replace the gears on it the smaller gear that's on the motor is showing excessive wear ?

Any thoughts on replacing the head of these to allow pumping for Presta valve bike tubes? I imagine the process would be simple, but am concerned about the insulation/wrapping on the hose.

Thanks for the informative video! Am looking to buy a battery-powered inflator, but this unit has too many critical parts made of plastic for my liking. How much would I need to pay for a rugged, reliable unit (if such a thing exists)?

Enjoyed your video. Had a dial type that went out on me. Purchased a digital read out, and now the numerals are out; still lights up, but no numerals. Any ideas??

You can make a 3d printed mold for the piston ring then use silicone to fill the mold

I smoked one in a month.... then I got the inflator deflator, not so accurate, then got new new one so far its good...

Even the cheapest Makita 18V tire infllator copies from aliexpress has Ball Bearings and polyamide housings......really sad quality from Ryobi

if you wanted to replace the hose, does it simply unthread and allow you to thread a new one in? Or is it non standard? Great vid

Could you help me with the price? And how to buy it from Ecuador?

do you know if there is some way I can replace the air hose with a standard air compressor hose?

Wish I could find the fan. I landed here looking for a replacement. Might buy the new one.

just buy a new one at Home Depot for $20 (pump only). Mine includes a fan on the motor. So did the old one. The znew one includes a spring behind the trigger. BTW, the new model has a digital pressure gage which is accurate.