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PAGE 28 — MQD2H/3H DIAPHRAGM PUMP • OPERATION MANUAL — REV. # 8 (07/31/20)

TROUBLESHOOTING (PUMP)

Table 9. Pump Troubleshooting (Continued)

Symptom

Possible Problem

Solution

Flow rate is slow.

Incorrect engine speed speed?

Increase engine speed.

Piping is clogged or damaged?

Clean or replace piping.

Clogged pump?

Clean pump well.

Discharge line restricted or undersize?

Flush out piping or replace.

Collapsible disc hose?

Replace with rgid or non-collapsible

hose.

Too many hose bends?

Straighten hose.

Hose lines too long?

Shorten hose lines.

Pump runs but no fluid.

Faulty suction piping?

Replace piping.

Pump located too far from fluid source?

Move pump closer to source.

Gate valve closed?

Open gate valve.

Clogged strainer?

Clean or replace strainer.

Discharge height too high?

Lower the height.

Pump starts and stops

pumping.

Leak in suction line?

Repair suction line.

Leak in foot valve?

Repair or replace valve.

Diaphragm has a crack or hole?

Replace diaphragm.

Defective or clogged flapper valves?

Clean or replace flapper valves.

Excessive noise while pump

is in operation.

Pump not secured properly?

Secure pump

Restricted suction line?

Clean or correct restriction.

Water can be seen on top of

diaphragm.

Diaphragm has crack or hole?

Replace diaphragm.

Screw loose holding diaphragm?

Tighten screw.

Pump stalls repeatedly

or stops for no apparent

reason.

Discharge height is over 25 feet (7.62

meters) of head?

Lower height

Material jammed in pump well?

Clean out pump well.

Содержание MQD2H

Страница 1: ...CCOMPANY THE EQUIPMENT AT ALL TIMES MODELS MQD2H MQD3H DIAPHRAGM PUMP HONDA GX120UT1QX2 GASOLINE ENGINE Revision 8 07 31 20 To find the latest revision of this publication or associated parts manual visit our website at www multiquip com ...

Страница 2: ...PAGE 2 MQD2H 3H DIAPHRAGM PUMP OPERATION MANUAL REV 8 07 31 20 PROPOSITION 65 WARNING ...

Страница 3: ...ormation 4 6 Specifications 7 Dimensions 8 General Information 9 Pump Components 10 11 Basic Engine 12 Inspection Engine 13 Setup 14 15 Operation 16 17 Maintenance Pump 18 21 Maintenance Engine 22 24 Storage 25 Troubleshooting Engine 26 27 Troubleshooting Pump 27 28 NOTICE Specifications and part numbers are subject to change without notice ...

Страница 4: ...y messages specifically address the level of exposure to the operator and are preceded by one of four words DANGER WARNING CAUTION or NOTICE SAFETY SYMBOLS DANGER Indicates a hazardous situation which if not avoided WILL result in DEATH or SERIOUS INJURY WARNING Indicates a hazardous situation which if not avoided COULD result in DEATH or SERIOUS INJURY CAUTION Indicates a hazardous situation whic...

Страница 5: ... the working area when the equipment is in operation DO NOT use the equipment for any purpose other than its intended purposes or applications NOTICE This equipment should only be operated by trained and qualified personnel 18 years of age and older Whenever necessary replace nameplate operation and safety decals when they become difficult read Manufacturer does not assume responsibility for any a...

Страница 6: ...ure strainer is not clogged Remove any large objects dirt or debris from the strainer to prevent clogging ALWAYS use a large basket strainer when pumping water that contains large debris ALWAYS flush pump clean after use when pumping water concentrated with heavy debris It is very important to always flush the pump before turning it off to prevent clogging Fix damage to machine and replace any bro...

Страница 7: ...rt 0 60 liter Speed Control Method Centrifugal Fly weight Type Starting Method Recoil Start Dimension L x W x H 11 7 x 13 4 x 12 5 in 297 x 341 x 318 mm Dry Net Weight 28 7 lbs 13 Kg Table 1 Specifications Pump Pump Model MQD2H MQD3H Type Diaphragm Pump Diaphragm Pump Suction Discharge Size 2 00 in 50 8 mm 3 00 in 76 2 mm Maximum Pumping Capacity 3 000 gallons hour 11 340 liters hour 5 400 gallons...

Страница 8: ... Figure 1 MQD2H 3H Dimensions Table 3 Dimensions Model A Lenght B Height C Width D Discharge E Suction MQD2H 39 in 99 06 cm 27 53 in 69 93 cm 25 68 in 65 23 cm 7 34 in 18 64 cm 5 62 in 14 27 cm MQD3H 41 5 in 105 41 cm 22 in 55 88 cm 30 in 76 2 cm 6 2 in 15 75 cm 6 3 in 16 cm ...

Страница 9: ...m pumps are designed to be used for dewatering applications The suction and discharge ports on the MQD2H use a 2 inch diameter opening which allows the pump to pump at a rate of approximately 3 000 gallons hour gph or 11 340 liters hour lph The suction and discharge ports on the MQD3H use a 3 inch diameter opening which allows the pump to pump at a rate of approximately 5 400 gallons hour gph or 2...

Страница 10: ...PAGE 10 MQD2H 3H DIAPHRAGM PUMP OPERATION MANUAL REV 8 07 31 20 Figure 2 MQD2H 3H Key Components PUMP COMPONENTS Contact your nearest Multiquip dealer for quick disconnect hoses and fittings ...

Страница 11: ... rubber hose to the discharge port on the pump Make sure that the hose lays flat and is not kinked Use only recommended type discharge hose Contact Multiquip parts department for ordering information 6 Suction Port Connect either a 2 inch or 3 inch inlet hose to this port depending on pump model 7 Suction Hose Connect a flexible rubber hose to the suction port on the pump Make sure that the hose l...

Страница 12: ...immediately after operating NEVER operate the engine with the muffler removed Figure 3 Engine Controls and Components INITIAL SERVICING The engine See Figure 3 must be checked for proper lubrication and filled with fuel prior to operation Refer to the manufacturers engine manual for instructions and details of operation and servicing The engine shown above is a HONDA engine operation for other typ...

Страница 13: ...e oil filler hole See Figure 4 and wipe clean Figure 4 Engine Oil Dipstick Removal DIPSTICK 3 Insert and remove the dipstick without screwing it into the filler neck Check the oil level shown on the dipstick 4 If the oil level is low See Figure 5 fill to the edge of the oil filler hole with the recommended oil type Table 6 Maximum oil capacity is 0 63 quarts 0 6 liters Figure 5 Engine Oil DipStick...

Страница 14: ...gned to protect the pump by preventing large objects from being pulled into the pump WARNING DO NOT open fill cap if pump is hot Water inside may be under pressure NOTICE Suction and discharge hoses are available from Multiquip Contact your nearest dealer for more information CAUTION Transmission fluid needs to be added prior to operation HANDLE INSTALLATION The MQD2H D3H diaphragm pumps are compl...

Страница 15: ...ontaining toxic substances These fluids can create potentially dangerous health and environmental hazards Contact local authorities for assistance CONNECTING ROD BEARING LUBRICATION 1 Grease connecting rod bearing thru the access hole Figure 8 every 25 hours of operation 2 Use only premium lithium based grease conforming to NLG1 Grade 2 consistency Figure 8 Connecting Rod Bearing Lubrication HELPF...

Страница 16: ... ON OFF THROTTLE LEVER RUN IDLE OPEN CLOSE CHOKE LEVER 4 Place the choke lever See Figure 12 in the OPEN position if starting a warm engine or the temperature is warm Figure 12 Engine Choke Lever Open 5 Place the engine ON OFF switch See Figure 13 in the ON position Figure 13 Engine ON OFF Switch ON Position 6 Grasp the starter grip See Figure 14 and slowly pull it out The resistance becomes the h...

Страница 17: ...5 strokes per pinute to about 40 strokes per minute for lesser volume seepage Smoothest operation can be determined by trying to pump at several speeds Limit maximum speed to 65 strokes per minute of the diaphragm 2 800 RPM engine speed STOPPINGTHE ENGINE Normal Shutdown 1 Move the throttle lever to the IDLE position See Figure 14 and run the engine for three minutes at low speed Figure 17 Throttl...

Страница 18: ...umed that the pump is not functioning correctly and corrective action needs to be taken 5 To test the flapper valve shut down the engine The vacuum tester should remain attached to the pump suction inlet port by vacuum This indicates the pump s flapper valve is seating properly to hold water in the suction hose when the engine is stopped This prevents backflow and allows for faster priming when th...

Страница 19: ...MQD2H 3H DIAPHRAGM PUMP OPERATION MANUAL REV 8 07 31 20 PAGE 19 MAINTENANCE PUMP Figure 21 Pump Vacuum Tester ...

Страница 20: ...s may build in the pump well and if not removed may cause extreme damage to the plunger arm and pump casing If a jam or suspected debris build up occurs the pump must be thoroughly cleaned as described in the Stalled Stopped Damaging Debris Section STALLED STOPPED DAMAGING DEBRIS If pump has stalled stopped or has been engaged in moving heavy debris laden fluids perform the following procedure 1 R...

Страница 21: ...9 6 KG M PLUNGER ARM LOCK SCREW MAINTENANCE PUMP DIAPHRAGM REPLACEMENT 1 Remove plunger cover as shown in step 1 of the Seized Plunger section 2 Remove handle as shown in Figure 6 of the Handle Installation section 3 Rotate pump output shaft until plunger arm is in the down position 4 Remove the four hex head cap screws hex nuts flat washers and lock washers from the pump base 5 Push pump well dow...

Страница 22: ... Spark Plug CHECK CLEAN X REPLACE X Cooling Fins CHECK X Spark Arrester CLEAN X Fuel Tank CLEAN X Fuel Filter CHECK X Idle Speed CHECK ADJUST X 2 Valve Clearance CHECK ADJUST X 2 Fuel lines CHECK Every 2 years replace if necessary 2 1 Service more frequently when used in DUSTY areas 2 These items should be serviced by your service dealer unless you have the proper tools and are mechanically profic...

Страница 23: ...E OUT FOAM FILTER ELEMENT GASKET WING NUT DAILY 1 Thoroughly remove dirt and oil from the engine and control area Clean or replace the air cleaner elements as necessary Check and retighten all fasteners as necessary Check the spring box and bellows for oil leaks Repair or replace as needed WEEKLY 1 Remove the fuel filter cap and clean the inside of the fuel tank 2 Remove or clean the filter at the...

Страница 24: ... protector 3 Remove the 4 mm screw from the spark arrester then remove the spark arrester Figure 29 Spark Arrester Removal 4 MM SCREW 5 MM SCREW MUFFLER PROTECTOR 5 MM SCREW SPARK ARRESTER 4 MM SCREW 4 Carefully remove carbon deposits from the spark arrester screen Figure 30 with a wire brush Figure 30 Cleaning The Spark Arrester 5 If the spark arrester is damaged and has breaks or holes replace w...

Страница 25: ...nkcase and fill with fresh clean oil then follow the procedures described in the engine manual for engine storage Remove the pump cover and clean inside of pump housing Coat inside of pump housing with a light film of oil to reduce corrosion A spray can of oil works well for this application Cover suction and discharge ports with duct tape to prevent any foreign matter from falling into pump Cover...

Страница 26: ...ush fuel system and replace with fresh fuel Air Cleaner clogged Clean or replace air cleaner Fuel is available and spark plug ignites compression low Defective cylinder head gasket Tighten cylinder head bolts or replace head gasket Cylinder worn Replace cylinder Spark plug loose Tighten spark plug Operation not satisfactory Not enough power available compression normal no miss firing Air cleaner c...

Страница 27: ... Increase throttle Strainer plugged Clean strainer Suction hose damaged Replace or repair hose and clamps Air leak at suction port Check that fittings are tight and properly sealed Pump is located too high above water line Move pump closer to water Debris collecting in pump housing Clean pump housing Valves not seated correctly Check that valves are seated correctly Pour water in in suction chambe...

Страница 28: ...ce Move pump closer to source Gate valve closed Open gate valve Clogged strainer Clean or replace strainer Discharge height too high Lower the height Pump starts and stops pumping Leak in suction line Repair suction line Leak in foot valve Repair or replace valve Diaphragm has a crack or hole Replace diaphragm Defective or clogged flapper valves Clean or replace flapper valves Excessive noise whil...

Страница 29: ...MQD2H 3H DIAPHRAGM PUMP OPERATION MANUAL REV 8 07 31 20 PAGE 29 NOTES ...

Страница 30: ...ere in effect at the time of approval for printing Illustrations descriptions references and technical data contained in this manual are for guidance only and may not be considered as binding Multiquip Inc reserves the right to discontinue or change specifications design or the information published in this publication at any time without notice and without incurring any obligations UNITED STATES ...

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