ZENY 3,5CFM Single-Stage 5 Pa Rotary Vane Economy Vacuum Pump 3 CFM 1/4HP Air Conditioner Refrigerant HVAC Air Tool R410a 1/4" Flare Inlet Port, Blue

The pump worked just fine on the first few occasions I used it. Terrible customer service. My purchase fulfilled the purpose for which it was purchased. Although I knew that it didn't come with the attachment I wanted to use to vacuum an automotive air conditioning system prior to buying it, I still paid for it anyway. It leaks oil terribly from this thing, which is what creates the problem. As soon as I bought it in September, I used it a couple of times, but by late October I was breaking into ZENY's customer service department because the thing was leaking so much oil. A side view of the bottom of the unit as well as the horizontally mounted side plate. discovered at least two places it leaks from (there may be more, but I would have to take it apart, I have the photographs to prove it, and I tried to get a replacement under warranty. As expected, their customer support department has been silent without This is something I'm going to complain about to Amazon. The current state of the file does not permit use.

Winnie Sexton

| Oct 11, 2020

I used it right out of the box and it worked well. We put it aside for three weeks and came back to find a good amount of oil under the housing on top of it. As it dripped down on the bench, it left a mark. It is hard to tell if it came from the drain plug or from where the aluminum body of the motor housing meets the oil reservoir. That is the front part of the motor housing with a level window. My investigation showed that the fitting surface of aluminum housing was poorly machined when I removed the allen bolts. Seals will always fail if there are enough defects to allow for oil to get through, and I found a few surface imperfections that might lead to an escape path. In the process of disassembling it, I decided to clean it all up, apply a thin layer of RTV to the joint surfaces, and place the reservoir back in place. The oil will be left out for the moment, and will not be put back in until I need it. Tempt fate does not have to be tempted.
Also, it appears that the screws holding the plastic cover to the switch are lacking. We can't tell if the vibrating is due to use or if it is due to vibration. We were able to get rid of them on our own without any problems. It was not clearly marked not to remove the cover, so I did so because there was no sticker warning me to do so. I was surprised to find that a relay was not mounted inside of the housing. All that is necessary is to connect a red wire to the motor from the switch. My feeling was that it shouldn't be moving all over the place. It was easily repaired, just by dabbing some hot melt glue on it. This product is priced well and I cannot find a better deal at this point, especially since returning and replacing is not worth the hassle. As a vacuum machine, it is powerful, efficient, and it draws a strong vacuum in a short period of time. Most of the time, you do get what you pay for, and that holds true here too.

Blake Sutton

| Nov 20, 2020

The area beneath five microns). A thermocouple gauge and just a thermometer enable me to accomplish 120 micron with my sample. I'm likely to make a trap for this pump, as it bubbles and spits some oil when pumping a gassy load. I hope to make a spout for this pump. There is no reason to believe the vacuum oil it comes with is up to scratch. This liquid has a distinct smell, which is not good, since you cannot smell anything in it so any vapour pressure there is not very good A trivial matter. In the future, the oil will be replaced with a higher quality vacuum oil, and I will see if the pump can pump a little If I get a single stage pump for $60 bucks I will be happy with anything with a micron rating of 100 or so. I didn't see any indication that the motor would cease to run, or that it would explode I have not had any problems with the start capacitor yet, but I've only had it running for a few hours.

Harlee Foster

| Aug 08, 2020

The pump did not operate at all during the two months it had been infrequently used. I found it to be very effective as well as fairly quiet when it worked. In my opinion, this pump should be recommended if not for the fact that you might have to replace it soon after buying.

Jamie Cain

| May 24, 2021

After the first few weeks, it seemed to work well. A lot of oil leaked out of the bottom after not using it for a couple of weeks.

Coraline Gross

| Nov 19, 2020

About a year ago, I bought this. There have been about three hours used on it in a half dozen different operations to cure ceramic fibers The oil that it uses is quite heavy, but it has been good so far. This is my first VP, so maybe it's just normal, since I don't have a baseline from which to compare? It doesn't exhaust the oil vertically, so the oil is pumped in a 1' diameter surrounding the pump exhaust. We put it on a platform of shop towels to keep some of the oil on the platform. As the oil in the kit has been used, it is almost at the low level again, so it is In summary, it accomplishes the task and it is priced reasonable, but it leaves a dirty mess behind it. In any case, I learned that after it oiled a bin full of plastic garbage, which of course is My experience with it has definitely improved since I bought it last summer, which may not be the norm, but my experience is what I see. The first is the best, unless better ones don't exhaust the oil and in that case I would spend the money on another one. If it is the norm, then I do not have any My only complaint is that I am ignorant of the appropriate expectations, so I would need to dock it 5 stars if that is typical.

Nathaniel Costa

| Mar 08, 2021

The first time I got into AC work was few years ago, and I decided to give it a shot now. An Expedition 2003 with 250K miles finally failed to have its compressor repaired. Amazon is where I bought a replacement compressor, a gauge set, and a vacuum pump. -the items were all received in good condition I intend to. It is necessary to install the vacuum pump after the compressor has been installed. In order to connect the vacuum pump, I used the "push-button" method A set of "on" connectors that came with the pump was mounted to the gauge set and connected the gauge fittings to the refrigerant lines There is no way to connect the pump improperly since the high and low side fittings are different sizes. Its switch is simply a toggle switch that allows it to be switched on and off The operation has been terminated. During the first few minutes it took the pump a few minutes to get down to the recommended 30 percent vacuum This is PSI. In order to determine whether the system had any leaks, I switched off both the gauge and the pump and waited for around four hours. Perfect performance was achieved by the pump. Considering the limited uses I will need it for, I'm uncertain what a more expensive pump could do differently, however this pump is adequate for my purposes. In the end, I spent $199. 00 (including shipping). I am very pleased with the quality of the pumps.

Kaiden Hull

| Aug 26, 2020