DIAPHRAGM PUMPS
OPERATION AND PARTS MANUAL
MODELS MQD2H MQD3H
Revision #6 10/27/11
PROPOSITION 65 WARNING
Page
HONDAGX120K1QX2 Engine
TABLE OF CONTENTS
MQ-D2H/D3HGasoline Powered Diaphragm Pumps
Component Drawings
Ordering parts has never been easier
PARTS ORDERING PROCEDURES
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Choose from three easy options
SAFETY SYMBOLS
SAFETY INFORMATION
SAFETY MESSAGES
Symbol
first aid kit
GENERAL SAFETY
fire extinguisher
SAFETY INFORMATION
NEVER disconnect any emergency or
PUMP SAFETY
ELECTRICAL SAFETY
SAFETY INFORMATION
LIFTING SAFETY
Power Cord/Cable Safety
Grounding Safety
TRANSPORTING SAFETY
SPECIFICATIONS
Table 1. Specifications Pump
Table 2. Specifications Engine
Dry Net Weight
MODEL
Table 3. Dimensions
DIMENSIONS
Oil Alert Feature
GENERAL INFORMATION
Power Plant
Table 5. Performance Loss at Various Elevations
used in general de-wateringapplications. Typical
COMPONENTS
Figure 2. MQ-D2H/D3HPump Application
CAUTION - Burn Hazard
BASIC ENGINE
DANGER - Explosive Fuel
Figure 3. Engine Controls and Components
Table 6. Oil Type
INSPECTION
CAUTION - Read Manual
DANGER - Explosive Fuel
CAUTION - General Safety Precautions
SETUP
Handle Installation
WARNING - Fill Cap
mechanical seal to prevent water
CAUTION - Strainer
CAUTION - Flammable Fluids
SETUP
CAUTION - Read Manual
OPERATION
Figure 13. Engine ON/OFF Switch ON Position
Starting the Engine HONDA engine
Figure 15. Choke Lever Open
Figure 18. Engine ON/OFF Switch OFF
OPERATION
Figure 16. Throttle Lever Run
Connecting Rod Bearing Lubrication
MAINTENANCE
FlapperValve Replacement
Pump Vacuum Test
Figure 21. Pump Vacuum Tester
MAINTENANCE
altitude. See Tables 4 and
CAUTION - Stalled or Stopped Pump
Rotation of Suction and Discharge Ports
Clearing a Jam-Up
Stalled Pump
MAINTENANCE
Diaphragm Replacement
Seized Plunger
Engine Maintenance
MAINTENANCE
Table 7. Engine Maintenance Schedule
1Service more frequently when used in DUSTY areas
Maintenance
DANGER - Combustion Fire , Explosion
MAINTENANCE
ENGINE AIRCLEANER
PREPARATION FOR LONG-TERMSTORAGE
Pump Storage
SYMPTOM
TROUBLESHOOTING
TABLE 8. ENGINE TROUBLESHOOTING
POSSIBLE PROBLEM
TABLE 9. PUMP TROUBLESHOOTING
TABLE 8. ENGINE TROUBLESHOOTING Continued
TROUBLESHOOTING
SYMPTOM
SYMPTOM
TROUBLESHOOTING
TABLE 9. PUMP TROUBLESHOOTING Continued
POSSIBLE PROBLEM
NO. Column
EXPLANATION OF CODE IN REMARKS COLUMN
SAMPLE PARTS LIST
PART NO. Column
HONDA GX120K1QX2 ENGINE
SUGGESTED SPARE PARTS
MQ-D2H/D3HDIAPHRAGM PUMP 1TO 3 UNITS WITH
Description
NAME PLATE AND DECALS ASSY
NAMEPLATE AND DECALS ASSY
NAME PLATE AND DECALS ASSY
PART NAME
REMARKS
MQD2H - WATERBOX AND FLAP VALVE ASSY
WATERBOX AND FLAP VALVE ASSY. 2-INCH
PART NAME
QTY. REMARKS
MQD2H - WATERBOX AND FLAP VALVE ASSY
MQD2H -PUMPASSY
PUMP ASSY. 2-INCH
PART NAME
MQD2H -PUMPASSY
PUMP ASSY. 2-INCH
QTY. REMARKS
HANDLE, ENGINE AND WHEEL ASSY. 2-INCH
MQD2H -HANDLE,ENGINE, AND WHEEL ASSY
REMARKS
MQD2H -HANDLE,ENGINE, AND WHEEL ASSY
PART NAME
335410800
MQD3H -WATERBOXAND FLAP VALVE ASSY
WATERBOX AND FLAP VALVE ASSY. 3-INCH
PART NAME
MQD3H -WATERBOXAND FLAP VALVE ASSY
WATERBOX AND FLAP VALVE ASSY. 3-INCH
QTY. REMARKS
MQD3H - PUMP ASSY
28 27
PART NAME
MQD3H - PUMP ASSY
PUMP ASSY. 3-INCH
REMARKS
MQD3H - HANDLE, ENGINE, AND WHEEL ASSY
7 6 1 2
HANDLE, ENGINE AND WHEEL ASSY. 3-INCH
REMARKS
MQD3H - HANDLE, ENGINE, AND WHEEL ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - AIR CLEANER ASSY
AIR CLEANER ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - AIR CLEANER ASSY
AIR CLEANER ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - CAMSHAFT ASSY
CAMSHAFT ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - CAMSHAFT ASSY
CAMSHAFT ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - CARBURETOR ASSY
CARBURETOR ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - CARBURETOR ASSY
CARBURETOR ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - CONTROL ASSY
CONTROL ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - CONTROL ASSY
CONTROL ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - CRANKCASE COVER ASSY
CRANKCASE COVER ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - CRANKCASE COVER ASSY
CRANKCASE COVER ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - CRANKSHAFT ASSY
CRANKSHAFT ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - CRANKSHAFT ASSY
CRANKSHAFT ASSY
13310ZE0601
HONDA GX120K1QX2 ENGINE - CYLINDER BARREL ASSY
CYLINDER BARREL ASSY
QTY. REMARKS
HONDA GX120K1QX2 ENGINE - CYLINDER BARREL ASSY
PART NAME
120A0ZH7810
HONDA GX120K1QX2 ENGINE - CYLINDER HEAD ASSY
CYLINDER HEAD ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - CYLINDER HEAD ASSY
PART NAME
12210ZH7000
HONDA GX120K1QX2 ENGINE - FAN COVER ASSY
FAN COVER ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - FAN COVER ASSY
FAN COVER ASSY
HONDA GX120K1QX2 ENGINE - FLYWHEEL ASSY
FLYWHEEL ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - FLYWHEEL ASSY
FLYWHEEL ASSY
HONDA GX120K1QX2 ENGINE - FUEL TANK ASSY
FUEL TANK ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - FUEL TANK ASSY
FUEL TANK ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - IGNITION COIL ASSY
IGNITION COIL ASSY
PART NAME
CAP ASSEMBLY, NOISE SUPPRESSOR
HONDA GX120K1QX2 ENGINE - IGNITION COIL ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - MUFFLER ASSY
MUFFLER ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - MUFFLER ASSY
MUFFLER ASSY
HONDA GX120K1QX2 ENGINE - PISTON ASSY
PISTON ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - PISTON ASSY
PISTON ASSY
HONDA GX120K1QX2 ENGINE - RECOIL STARTER ASSY
RECOIL STARTER ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - RECOIL STARTER ASSY
PART NAME
28400ZH8013ZB
HONDA GX120K1QX2 ENGINE - GASKET KIT ASSY
GASKET KIT ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - GASKET KIT ASSY
GASKET KIT ASSY
REMARKS
HONDA GX120K1QX2 ENGINE - LABELS ASSY
LABELS ASSY
PART NAME
HONDA GX120K1QX2 ENGINE - LABELS ASSY
LABELS ASSY
PAYMENT TERMS
TERMS AND CONDITION OF SALE - PARTS
SPECIAL EXPEDITING SERVICE
FREIGHT POLICY
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