manual for DP6381 / M819 airless paint sprayer diaphragm pump

. Safety precautions
1. As the airless paint sprayer is a high-pressure power tool, any inattention or improper operation, maintenance on your unit may result in equipment damage or severe personal injury. So before using your sprayer, make sure you read, fully understand, and will follow all the safety and operating instruc-tions given in this manual.
2. Make sure the work area is in order, with no clutters, having sufficient visibility and be well ventila-ted.
3. Make sure the sprayer and paint bucket is placed securely when working. Make sure all cords, extensions, and hoses are free from sharp objects.
4. Always keep firm footing and balance when operating your sprayer. Take special care especially when you are working at heights (on scaffolding for example).
5. Make sure the power source is securely grounded and match the motor rating of your sprayer. If an extension cord is needed, use one that is heavy enough, as an undersized cord will cause greater drop in line voltage causing loss of power and overheating.
6. Before connecting your sprayer to power source, check hoses for cuts, leaks, abrasion or damage or movement of couplings, check all valves, controls and indicators to make sure they function proper-ly.
7. Make sure the hydraulic oil in the pump is clean and sufficient in volume. Starting the sprayer with-out sufficient hydraulic oil is not permitted.
8. To prevent earlier wear of the sprayer and even equipment failure, make sure paints and solvents to be used with the sprayer are clean and free from impurities.
9. Watch for spraying pressure indicated in the pressure gauge, make sure it does not exceed 22.5-MPa. Make sure using the high pressure hose from supplier.
10. Never aim the gun at any part of the body. Never allow any part of the body to come in contact with the fluid stream.
11. Do not use this sprayer to spray any corrosive, or poisonous solvents (acids, banana oil, pestici-des, fertilizers etc.)
12. Keep the sprayer free of ignition sources. Do not eat or smoke when operating.
13. After each use, relieve pressure in the system before turning off the motor. Then clean the syste-m (all the parts paint having flowed through) with water or other appropriate solvents.
14. Do not transport the sprayer with power on. Disconnect power source before cleaning or doing any maintenance. Do not have the motor and the plug come in contact with water, paints or solvents.
15. Do not modify the sprayer in any way without approval. Use only original or authorized parts for replacement.
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Ⅱ. Preparation
1. Attach the pressure gauge, open the dustproof plug on inlet valve. (Fig.1)

Fig. 1

    2. Put the high pressure hose on the outlet valve, and input hose to the inlet valve, tighten them, then loosen the prime/spray valve, open the pressure valve.(fig2)

Fig.2

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.Preparation before spraying
Put the input hose into the bucket with some water, turn on the motor and push the manual assistant valve repeatly to help to suck liquor. In a few seconds, water will begin to flow up through the tube and flow out from outlet valve, tighten the outlet valve deasil, then tighten the pressure valve deasil. When the pressure reaches up to around 22.5MPa, check if there is any leakage on the outlet hose, if it doesn’t leak, open the spraying gun and have a testing spray. (Fig.3)

Fig. 3

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.Spraying instructions
1.During paint spraying, hold the gun upright to the surface of paint-object and keep a constant spraying distance of 350~400mm.(Fig.4)
2.Move gun before starting the trigger. Equably move gun when spraying. At last, loosen the trigger and stop moving immediately. Adjust moving speed according to thickness of paint, spray pressure and the distance of gun to object.
3.In order to get an intact and slick surface, spray from level and vertical respectively . Spraying time will be variable with different paints. Spray for second time when the first painting is dry .

Begin spraying           on well spray         stop spraying
(Fig.4)

    4.During your spraying if you need to stop for several minutes, loosen the pressure valve and revolve prime valve in counter-clockwise, then shut the motor. Put spraying tip into solution in case of paint block-up in the spraying tip.

When spraying tip is block-up, revolve it 180 degree for several times, then move back in position of well-spraying.

Fig.5

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.Turning off machine
After spraying, revolve pressure valve in counter-clockwise, loosen handle of prime valve, then shut the motor after the pressure gauge shows “0”.
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Ⅵ.Cleaning, maintenance and storage
1) After spraying, clean machine to avoid indurations and block-up. .
2) Clean gun Filter after machine is used for some time. Discharge hose connector and hook plate, screw out gun handle, take out filter pistil and clean it, then fix them back. Change a new filter pistil when it is damaged. Wash the machine with relevant solvents for different paints.

Fig.6

    3) During spraying, check and clean suction-filter in time when paint blocks up. Usually clean it once after each use.
4) To check timely if fixed parts are loosened and sealed parts have any leakage.
5) Usually after three months’ usage of the machine, open pump cover and check if hydraulic oil is clean and enough. Add hydraulic oil when it’s in short; change hydraulic oil if it isn’t clean. Clean oil-case of pump with diesel oil before changing hydraulic oil, and then add hydraulic oil to 85% of oil-case capacity.
6) If you use this machine the second day, It is not necessary to clean it, dip the suction hose and tip into paint. For long storage, discharge the liquid in the machine, pack it well, store in dry and well-ventilated place, and don’t be pressed by any articles.
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.Trouble shootings
The normal problems for machine are:
1)The machine doesn’t absorb liquid.
2)It doesn’t spray.
Please try the following solution:
1)Check if Inlet valve is in stickiness or leakage. If inlet valve is sticky, refer to fig.1. Push the dustpr-oof plug inside the inlet valve. To fill water into inlet valve and check whether it’s leaky. If it’s leaky, contact supplier to change it.

Fig.7

        2)Check whether the diaphragm is damaged. If it is damaged, oil goes out from outlet hose when it absorbs liquid, in additional, check if there is any hydraulic oil in the pump.

Put this machine backward, loosen four fixed bolts on valve assembly, remove them and take out diaphragm to change.

It’s necessary to discharge air after changing diaphragm. Please follow these steps: Unscrew copper nut of pressure valve, turn on the motor repeatly till air is out. To check if the air is released, tighten copper nut of pressure valve, remove inlet valve and extend finger into the center hole of inlet valve, gently touch the diaphragm, if you can feel it’s vibrating, it means there is no air inside Otherwise, repeat the above.

Fig.8

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Ⅷ.Other trouble shootings
1.If the prime valve is leaky, circumfluence accrues in outlet hose when the valve is closed.
1). Open and close spray valve in times to check whether inner parts of spray valve are locked.
2).Discharge spray valve to check whether it is damaged. Take out gasket to inspect if the surface of it and hole bottom of spray valve are smooth. Change gasket if it isn’t good. Contact supplier to maintain if hole bottom of spray vale isn’t good. (Fig.9)
2.Leakage between valve assembly and pump
1)Check if the four bolts are loosening.
2)Change valve assembly if seal grains behind it are damaged.(Fig.10)

Fig.9

Fig.10

    3. Contact the manufacturer if oil leakage in motor occurs, no hydraulic oil in pump or motor doesn’t work.
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Ⅸ.Paint sprayer assembly, Valve assembly, Spray gun assembly
Fig.11 Exploded parts view and parts list (The whole unit)
m819 airless paint sprayer pump
NO.   DESCRIPTION Q’TY NO. DESCRIPTION Q’TY
1 Gun 1 6 Inlet hose 1
2 Hydraulic pump 1 7 Outlet hose 1
3 Valve assembly 1 8 Filter 1
4 Pressure valve 1 9 Flame 1
5 Motor 1 10 Handle 1
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Fig.12  The valve assembly
valve block for M819 diaphragm pump
NO.  DESCRIPTION Q’TY NO.  DESCRIPTION Q’TY
11 Outlet valve 1 15 Manual assistant valve 1
12 Plastic packer 1 16 Inlet valve 1
13 Prime/spray valve 1 17 Pressure gauge 1
14 Connector of outlet hose 1 18 Valve block 1
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Fig.13  The gun
NO. DESCRIPTION Q’TY NO. DESCRIPTION Q’TY
19 Spray tip 1 27 Housing 1
20 Tip support 1 28 Gun filter 1
21 Valve seat 1 29 Gun handle 1
22 Valve stem 1 30 Hook plate 1
23 Trigger pin 1 31 Hose connector 1
24 Nut 1 32 Trigger guard 1
25 Retainer block 1 33 Gun trigger 1
26 Thrust pin 2 34 Tip guard & base 1
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3 comments

  1. P Visser
    2017/05/22 at 10:21:51

    looking for a diaphragm for dp6381/m819 pump in South Africa if posible

  2. Hayden
    2015/12/20 at 04:44:41

    Hi,
    I am trying to source parts for your pumps in New Zealand, can you advise if you have an agent here please?
    Thanks,
    Hayden

  3. racovita ioan
    2015/08/22 at 16:50:53

    dawnload

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