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why my diaphragm pump sprayer doesnt suck the paint

why my diaphragm pump airless paint sprayer doesn’t suck the paint ?

sometimes we got complaints from our clients that our diaphragm pump paint sprayer machine doens’t suck the material. let us explain to you. There’re 3 reason , and 3 step to solve this problem. It’s very easy.

1. If the sample is shipped by Air / Plane, or by DHL/TNT/FeDEX posting, we had poured out the hydraulic oil before shipment. (because the oil / liquid is not allowed to be loaded onto plane)

so you must pour  hydraulic oil  (about 0.8 Liter) into the pump,  The oil is 46# anti-wear hydraulic oil normally. but you can chose Good quality oil like Shell Tellus High Performance Hydraulic Oil 46# .   The oil is about 85-90% full, MUST not 100% full. please see below picture.

2. please use your finger or a pen  to push the spring nut inside the SUCTION VALVE (INLET VALVE)

This way is for make sure the Suction Valve Spring was not stuck after storage & transportation.

if you switch on the machine, you could feel the vibration of the Suction Valve Spring.

If the Suction Valve Spring is Vibrating, that means it’s ok for sucking the paint.

please see below picture.

3. Make sure the suction tube is tightly screwed on.

if the tube is too loose, the air will enter inside, then the paint couldn’t be sucked, or sucked very slowly, and also the pressure can’t reach 210bar or more.

4. If all above 3 steps are finished, but the paint still can’t be sucked, we’ll take the last step to exhaust the air inside the Oil Passing Way.

Because the machine will be shipped to your country through truck / container, during the long way transportation, the air maybe enter into the Oil Passing Way. so we must exhaust all the air out, and then the piston push the oil,and the oil could push the diaphragm for vibrating.

if there’s air inside, the oil can’t push the diaphragm any more, and the paint couldn’t be sucked of course.

How to exhaust the air inside the oil of airless sprayer?

it’s very easy, set the Prime Spray Valve in A. Prime position, and regulate the Pressure Control Valve to the Weakest (0 bar), and then switch on the machine, let it run for 30 seconds, then the air could be exhausted.

 

 

5. After the air exhausted, we could adjust the Pressure Regulator Valve clockwise to higher pressure.

There’s one small HEX screw to fix the out cover with inner pin. but sometimes this screw is not very tight, the result is: when you regulate the valve again and again, but the pressure is still same, dont’ go up.

If this happened, you need to push hard on the Regulator Valve and then turn it clockwise.

This will make sure the inner pin are turning accordingly.


         
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3 comments

  1. Alex
    2017/07/04 at 04:06:13

    Hi I have a campbell hausfeld Airless paint spryer which is not priming or spraying at all I checked the lines for any obstructions but everything is clear. My question is, how to know whether the valves or the diaphragm is bad?

  2. mahendran
    2014/08/27 at 22:19:31

    hi,

    2nd step

    This is my problem The suction valve spring is could not vibrating
    please tell about this problem
    Thanks

  3. mahendran
    2014/08/27 at 22:18:34

    hi,

    2. please use your finger or a pen to push the spring nut inside the SUCTION VALVE (INLET VALVE)
    This way is for make sure the Suction Valve Spring was not stuck after storage & transportation.
    if you switch on the machine, you could feel the vibration of the Suction Valve Spring.
    If the Suction Valve Spring is Vibrating, that means it’s ok for sucking the paint.
    please see below picture.

    This is my problem The suction valve spring is could not vibrating
    please tell about this problem
    Thanks

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FAQ regarding our business

Q1: What's your MOQ minimum order quantity for formal order?

A: Our MOQ is 10-100 units depends on the model. For small pump or spray guns , the MOQ is 100. and for large capacity pump, the MOQ could be 10. We can accept 1 or 2 units for sample testing order.

Q2: What's your payment terms?

A: We could accept L/C, T/T and Paypal or Western Union, also accept the payment against B/L copy . We can offer credit payment term for our long year cooperated representatives.

Q3: What is the lead time?

A: Sample order: 3-5days, mass production 20-40 days for the formal order.

Q4: Can we put our logo on your products? Is there extra charge for it?

A: Yes, we accept the OEM order based on the order quantity. The color box package need extra cost for less container order.

Q5: What's your warranty?

A: our warranty is 12months limited warranty except the easily worn parts. and for the motor we offer 2 years warranty.

Q6. Which port do you ship your machines?

A: We ship from Ningbo port China. for the FOB price, we will bear the local freight charge and the forwarder fee / customs fee, and all the shipping cost / insurance cost / forwarder cost at destination port / import duty tax ... all will be beared by the buyer (or importer).

Q7. how can i buy your products?

A: if you're final user, please leave your mobile phone number to us, and we will ask our distributor / dealer to call you directly. if you want to be our distributor or representative, welcome to contact us by email or whatsapp. we can talk more details one by one, we're sure you would be satisfied with our quality / service and price.

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