MH Owner’s Manual • Installation • Use • Maintenance General Pump is a member of the Interpump Group 8
GENERAL PUMP INDEX 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. A member of the Interpump Group MH SERIES INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3 SYMBOL DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3 SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3.1 General warnings for safe operation . . . .
GENERAL PUMP 1. INTRODUCTION A member of the Interpump Group MH high pressure water plunger pumps have been designed for long life industrial duties and provided they are correctly installed and maintained will give long trouble-free operation. Read and understand this manual before using your pump; it contains the necessary information for the correct installation, use and maintenance as well as some practical suggestion for trouble shooting.
GENERAL PUMP A member of the Interpump Group 3.3 Safety of operation The access into the area when a high pressure unit is working should be strictly prohibited to unauthorized personnel. The area should be suitably enclosed and its perimeter, so far as is reasonably practical, cordoned off and proper warning notices displayed in prominent positions.
GENERAL PUMP MH SERIES A member of the Interpump Group 4. PUMP IDENTIFICATION Each pump is fitted with a rating plate (see Fig. 1) containing the following information: 2. 3. 4. 5. 6. 7. 8. pump model and version serial number max RPM max operating pressure (bar) oil capacity (ltr) and oil specification gear box ratio max flow rate (l/min) Pump model, pump version and serial number should be specified when ordering spare parts. Should the pump be modified (i.
GENERAL PUMP A member of the Interpump Group 7. GENERAL INFORMATION ABOUT PUMP USE MH SERIES 8. CONNECTIONS AND PLUGS The MH pump has been designed to pump fresh filtered water at room temperature. 7.1 Water temperature Water temperature is critical for the pump life, the higher it is, the more likely it is to crate cavitation, resulting in premature seal and valve failures.
GENERAL PUMP 9. PUMP INSTALLATION A member of the Interpump Group 9.1 Positioning The pump should be installed flat on a rigid base by means of the four feet Ø 16.5 mm. The base should be rigid enough to avoid any misalignment of flexing of flexing of the pump/transmission coupling axis due to the torque involved during operation. On no account should the pump be installed in such a way its fluid end rests on the base where the pump is mounted.
GENERAL PUMP A member of the Interpump Group MH SERIES 9.5 Filtration All pumps require a suitable filter. The filter should be installed as close as possible to the pump, should allow easy inspection and have the following characteristics: 1. The filter capacity should be at least three times the rated pump volume. 2. Filter port diameters should not be smaller than the pump inlet ports. 3. Filtration degree in between 50 and 80 mesh (360 to 200 microns.
GENERAL PUMP A member of the Interpump Group 10. START UP AND RUNNING PROCEDURES 10.1 Before start up Before start up make sure that the following conditions have been complied with: 1. Suction line should be connected: the pump must never run dry. 2. Suction line must be perfectly air-tight. 3. Any ON-OFF valve in between the pump and water source should be open and make sure the water gets into the pump freely. 4.
GENERAL PUMP A member of the Interpump Group 11. MAINTENANCE INSTRUCTIONS 11.1 Crank mechanism maintenance. Check oil level on a weekly basis by means of the two oil dipsticks (1, Fig. 8) provided with notches for min. and max. levels. MH SERIES 11.2 Fluid end maintenance The fluid end does not require periodical maintenance. Service operations are limited to valve inspection and/or replacement, when necessary. In order to remove the valves: Loosen and remove the valve cover screws. 1, Fig.
GENERAL PUMP A member of the Interpump Group MH SERIES Should excessive scaling inside the fluid end hinder the valve extraction open one of the two lateral inlet ports, remove the three plugs 1, Fig. 15, insert our special tool p/n F200030090 (2, Fig. 15), or a corresponding one, and push the valve unit out as shown in Fig. 15. Check the valve components for wear and replace where necessary. Every time valves are inspected all o-rings of the valve units and valve covers should be replaced.
GENERAL PUMP A member of the Interpump Group 11.3 Pumping unit maintenance The only maintenance operation required for the pumping unit is the pressure packings greasing through the proper greasers (1, Fig. 16). MH SERIES Loosen and remove the plunger screws (1, Fig. 18). Greasing should be carried out at even intervals at least every 100 hours by means of a hand pump. Stop greasing when the pump trigger becomes harder to operate: that means the grease chamber is full.
GENERAL PUMP A member of the Interpump Group MH SERIES With the tool in place, rotate the crankshaft until the packing support is pushed out together with plungers and cylinders (Fig. 21). Repeat the operation for each pumping unit. Separate the pumping unit components and check them for wear. Pressure packing replacement is carried out by hand without need of special tools (Fig. 24) A little bit of grease helps when sliding the packings into the packing support.
GENERAL PUMP A member of the Interpump Group 12. SCREW CALIBRATION Screw calibration is to be carried out by means of a torque wrench only: DESCRIPTION Ft. Lbs. Head Bolts 260.3 Connecting Rod Screws 54.2 Valve cover screws Plunger bolts N-m Kgm. 353 36 86.7 117.6 72.3 98 13. MAINTENANCE TOOLS 73.5 12 10 7.
GENERAL PUMP A member of the Interpump Group 16.
GENERAL PUMP Item Part # 1 F080100200 3 F871131100 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 F872047006 F052000060 F052000080 F030000080 F042000000 F871024107 F872126004 F871125109 F871121151 F063100070 F080600090 F881080028 F811110012 F063100050 F080600080 F872098009 F872097013 F052000070 F052000090 F052000190 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 F052000200 F811110006 F871131107 F812000000 F872046006 F035
GENERAL PUMP A member of the Interpump Group 17. TROUBLE SHOOTING MH SERIES THE PUMP DOES NOT PRODUCE ANY NOISE: the pump is not primed and is running dry! - No water in the inlet line - The valves are blocked - The pressure line is closed and does not allow the air to get out the fluid end. INSUFFICIENT PUMP PRESSURE: - The nozzle is (or has become) too large.
GENERAL PUMP MAINTENANCE LOG A member of the Interpump Group MH SERIES HOURS & DATE OIL CHANGE GREASE PACKING REPLACEMENT PLUNGER REPLACEMENT VALVE REPLACEMENT GP Companies, Inc. 1174 Northland Drive Mendota Heights, MN 55120 Phone:651.686.2199 Fax: 800.535.1745 www.generalpump.com email: sales@gpcompanies.com Ref 300019 Rev.
