GP MF Series User manual

MF
Owner’s Manual
• Installation
• Use
• Maintenance
MF45 - MF50 - MF55
Ref 310069 Rev. B
07-18
General Pump
is a member of
the Interpump Group
8

Page 2
INDEX
1. INTRODUCTION ...............................................................Page 3
2. DESCRIPTION OF SYMBOLS ....................................................Page 3
3. SAFETY ......................................................................Page 4
3.1 General safety instructions ....................................................Page 4
3.2 High pressure unit safety requirements...........................................Page 4
3.3 Safety during operation ....................................................... Page 4
3.4 General procedures for using nozzles............................................Page 4
3.5 Safety during unit maintenance .................................................Page 5
4. PUMP IDENTIFICATION .........................................................Page 5
5. TECHNICAL FEATURES ........................................................Page 6
6. DIMENSIONS AND WEIGHT .....................................................Page 6
7. OPERATING INSTRUCTIONS ....................................................Page 7
7.1 Water temperature ...........................................................Page 7
7.2 Maximum flow and pressure rates...............................................Page 7
7.3 Minimum RPM ..............................................................Page 7
7.4 Recommended lubricant types and Manufacturers .................................. Page 7-8
8. PORTS AND CONNECTIONS ....................................................Page 9
9. PUMP INSTALLATION ..........................................................Page 9
9.1 Installation .................................................................Page 9
9.2 Direction of rotation .......................................................... Page 10
9.3 Version change and reducer positioning ..........................................Page 10-11
9.4 Hydraulic connections ........................................................Page 12
9.5 Pump power supply ..........................................................Page 12
9.6 Suction line ................................................................Page 12
9.7 Filtration ...................................................................Page 13
9.8 Outlet line..................................................................Page 14
9.9 Internal diameter of hose ......................................................Page 14
9.10 V-belt transmission .........................................................Page 15
10. START UP AND OPERATION ....................................................Page 15
10.1 Preliminary inspections ......................................................Page 15
10.2 Starting up ................................................................Page 16
11. PREVENTATIVE MAINTENANCE .................................................Page 16
12. PUMP STORAGE ..............................................................Page 17
12.1 Filling the pump with anti-corrosion emulsion or anti-freeze ..........................Page 17
12.2 Hoses....................................................................Page 17
13. PRECAUTIONS AGAINST FREEZING..............................................Page 17
14. WARRANTY TERMS............................................................Page 17
15 TROUBLESHOOTING...........................................................Page 18
16. EXPLODED VIEWS AND PARTS..................................................Page 19-20
17. REPAIR TOOLS................................................................ Page 21
18. MAINTENANCE LOG ...........................................................Page 22
MF SERIES
GENERAL PUMP A member of the Interpump Group
Ref 310069 Rev. B
07-18

2. SYMBOL DESCRIPTIONS
Warning
Potential Danger
Danger
High Voltage
Danger
Wear protective mask
Danger
Wear goggles
Danger
Wear protective gloves
Danger
Wear protective boots
Read carefully and understand
the manual before operating
the pump
1. INTRODUCTION
This manual describes the use and maintenance instructions of the MF pump, and should be carefully read and
understood before using the pump.
Correct use and adequate maintenance will guarantee the pumps trouble-free operation for a long time. General Pump
declines any responsibility for damage caused by misuse or the non-observance of the instructions indicated in this
manual.
Upon receiving the pump, check that it is complete and in perfect condition. Should anything be found out of order, please
contact us before installing and starting the pump.
MF SERIES
GENERAL PUMP A member of the Interpump Group
Symbol for protection against
explosion.
This defines special safety requirements
for the us of the pumps in areas indentified
in accordance with the ATEX Directive.
When pumps are ordered in the ATEX
configuration because they are going
to work in areas with a potentially explo-
sive atmosphere, you must STRICTLY
comply with the notes given under the
headings marked with this symbol and
the instructions in the supplementary
instructions manual “ATEX EXPLOSION
PROTECTION”.
(Versions available in compliance with
ATEX:MF)
Page 3
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3. SAFETY
3.1 General Safety Indications
Improper use of pumps and high pressure systems, and the non-compliance with installation and maintenance
instructions may cause severe injury to people and/or damage to property. Anyone assembling or usinge high pressure
systems must possess the necessary competence to do so, should be aware of the characteristics of the components
assembled/used, and must take all precautions necessary to ensure maximum safety in any operating condition. In the
interest of safety, both for the Installer and the Operator, no reasonably applicable should be omitted.
3.2 High pressure unit safety requirements
1. The pressure line must always be equipped with a safety valve.
2. High pressure system components, in particular for those units working outside, must be adequately
protected against rain, frost and heat.
3. The electrical control system must be adequately protected from water spray, and must comply with the
specific regulations in force.
4. High pressure hoses must be properly sized for maximum operating pressure of the system and always and only
used within the operating pressure range specified by the hose manufacturer. The same rules should be observed
for all other auxiliary systems affected by high pressure.
5. The ends of high pressure hoses must be sheathed and secured to a solid structure to prevent dangerous
whiplash in case of bursting or broken connections.
6. Appropriate safety guards must be provided for the pump transmission systems (couplings, pulleys and belts,
auxiliary drives).
3.3 Safety During Operation
The working area of a high pressure system must be clearly marked. Access must be prohibited to un-authorized
personnel and, wherever possible, the area should restricted or fenced. The personnel authorized to access this area
should first be trained, and informed about the risks that may arise from failures or malfunctions of the high pressure unit.
Before starting the unit, the operator must check:
1. That the high pressure system is properly powered (see paragraph 9.5).
2. That pump intake filters are perfectly clean; we advise the use of a device that indicates the filters clogging level.
3. Electrical parts are adequately protected and in perfect condition.
4. The high pressure hoses do not show apparent signs of abrasion, and that fittings are in perfect shape.
Any fault or reasonable doubt that may arise before or during operation should be promptly reported and verified by
competent personnel. In these cases, pressure should immediately be released and the high pressure system stopped.
3.4 General Procedures For Using Nozzles
1. The Operator must always place his/her safety and security first, as well as that of others that may be directly
affected by his/her actions, or any other assessments or interests. The operator’s work must be dictated by common
sense and responsibility.
2. The Operator must always wear a helmet with a protective visor, waterproof clothing, and appropriate boots capable
of guaranteeing grip on wet pavement.
MF SERIES
GENERAL PUMP A member of the Interpump Group
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Page 5
Note: appropriate clothing will effectively protect against water spray, but it may not offer adequate protection against the
direct impact of water jets or sprays from a close distance. Some circumstances may require further protection.
3. It is generally best to organize personnel into teams of at least two people capable of giving mutual and immediate
assistance in case of necessity and of taking turns during long and demanding operation.
4. Access to the work area that is within the water jets’ range must be absolutely prohibited to and free from objects
that, inadvertently under a pressure jet, can be damaged and or create dangerous situations.
5. The water jet must only and always be directed in the direction of the work area, including during testing or
preliminary tests or checks..
6. The Operator must always pay attention to the trajectory of the debris removed by the water jet. If
necessary, suitable guards must be provided by the Operator to protect anything that may be accidentally exposed.
7. The Operator should not be distracted for any reason during operation. Workers needing to access the operating
area must wait for the Operator to stop work, and then immediately make their presence known.
8. For safety reasons, it is important that each member of the team is fully aware of the intentions and actions of
other team members in order to avoid dangerous misunderstandings.
9. The high pressure system must not be started up and run under pressure without all team members in position
and without the Operator having already directed his/her lance toward the work area.
3.5 Safety During System Maintenance
1. The pressure system maintenance must be carried out in the time intervals set by the manufacturer who is
responsible for the whole group according to law.
2. Maintenance should always be carried out by trained and authorized personnel.
3. Assembly and disassembly of the pump and its various components must be performed exclusively
by authorized personnel, using appropriate equipment in order to avoid damage to components and connections.
4. Always use original spare parts to ensure total reliability and safety.
4. PUMP IDENTIFICATION
Each pump has a specific label (1, fig. 1) which contains:
Pump model and version
Serial Number
Maximum RPM
Power Hp-kW
Presure - P.S.I.
Flow Rate - GPM
Pump model, version and serial number must always
be specified when ordering spare parts.
MF SERIES
GENERAL PUMP A member of the Interpump Group
For pumps ordered with the ATEX configuration.
(2, fig. 1) With specific ATEX marking for explosion
protection.
(3, fig. 1) For locating the grounding screw.
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Page 6
5. TECHNICAL FEATURES
MODEL RPM FLOW RATE PRESSURE POWER
l/min GPM PSI Bar Hp kW
MF 45
800
1500
1800
2200
2600
267
267
269
270
270
70.6
70.6
71
71.3
71.3
2900 200
139
139
140
140
140
102.2
102.2
102.9
102.9
102.9
MF 50
800
1500
1800
2200
2600
330
330
332
333
333
87.2
87.2
87.6
88
88
2465 170
146
146
147
147
147
147
107.3
107.3
108.1
108.1
108.1
MF 55
800
1500
1800
2200
2600
399
399
401
403
403
105.4
105.4
106
106.5
106.5
2032 140
145
145
146
147
147
106.6
106.6
107.3
108.1
108.1
MF SERIES
GENERAL PUMP A member of the Interpump Group
6. DIMENSIONS AND WEIGHT
Weight: 551 Lbs./250 Kg.
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Page 7
MF SERIES
GENERAL PUMP A member of the Interpump Group
7.INFORMATION ABOUT PUMP USE
The MF pump, when not ordered with the ATEX configuration, is designed to operate in environments with
atmosphers that are not potentially explosive, and with filtered water (see par. 9.7)
Other fluids may be used only upon the approval of The Customer Service Department.
7.1 WaterTemperature
The max water temperature is 1040F (400C).However, it is possible to use the pump at temperatures
of up to 1400F (600C) for short periods of time. In this case we advise consulting the Customer Service
Department.
7.2 Max Pressure and Flow Rate
The performance values indicated in the catalog refer to the maximum performance of the pump. Regardless of the power
used, pressure and maximum RPM values indicated on the plate may not be exceeded unless expressly authorized by the
Customer Service Department.
7.3 Minimum Operating Speed
The minimum speed of the crankshaft for these types of pumps is 300 RPM. Any RPM value different from what is
indicated in the performance table (see chapter 5) must be expressly authorized by the Customer Service Department.
7.4 Recommended Lubricant Oil Types & Manufacturers
The pump is delivered with lubricant oil compliant with room temperatures ranging between 320and 89.60F (00and
300C ). Some recommended lubricant types are indicated in the table below; these lubricants are treated with additives
in order to increase corrosion protection and resistance to fatigue. As an alternative, Automotive SAE 85W-90 gearing
lubricants may also be used.
Check the oil level by using the oil level dipstick (1, fig.
3). Refill if necessary to top off level. Correct oil level
inspection is done with the pump at room temperature;
oil is changed with the pump at working temperature, by
removing the rear plug (2, fig. 3).
Checking and changing oil is to be carried out as indicated
in Chapter 11. The amount required is 287 oz. (8.5 liters)
for pumps with reduction units and 253 oz (7.5 liters) for
pumps with no reduction units.
BRAND TYPE
GENERAL PUMP SERIES 220
ARAL Aral Degol BG 220
BP ENERGOL HLP 220
CASTROL Hyspin VG 220, Magna 220
ELF
POLYTELIS 220
ESSO NUTO 220
FINA Cirkan 220
FUCHS RENOLIN 220
MOBIL DTE OIL BB
SHELL TELLUS C 220
TEXACO RANDO HD 220
TOTAL CORTIS 220
Set up the pump so that the oil temperature
does not exceed in any case 212°F (100°C)
during pump operation.
Use a temperature probe to be inserted into
the oil drain plug (2, fig. 3). See the “ATEX
EXPLOSION PROTECTION” manual.
ATTENTION: Use only oil with flash point
higher than 392°F (200°C).
Ref 310069 Rev. B
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MF SERIES
GENERAL PUMP A member of the Interpump Group
In any case, oil must be changed at least once a year since it may deteriorate by oxidation.
For room temperatures that differ from that mentioned earlier, follow the indications contained in the
diagram below, keeping in mind that the oil must have a minimum viscosity of 180 cSt.
VISCOSITY/ROOM TEMPERATURE DIAGRAM
Exhausted oil must be collected in an appropriate container and disposed of in appropriate
locations. In absolutely no case may it be dispersed into the environment.
Page 8
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MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 9
8. PORTS AND CONNECTIONS
MF Series pumps are equipped with (see fig. 4):
1. 2 inlet ports “IN”, Ø2.598 inch (66 mm) (on MF45, MF50, MF55 versions).
The line can be connected to either of the two inlet ports; the ones not being used must be hermetically sealed.
2. 2 outlet ports “OUT”, G1 1/4” (on MF45, MF50, MF55 versions).
3. 1 drain port “DRAIN” with G1/2” hole in the lower cover to monitor any water leakage due to wear of the pressure
packings. In case of leaks, please consult the repair manual.
This hole must always be kept open.
9. PUMP INSTALLATION
9.1 Installation
The pump must be installed in a horizontal position using the M16 threaded support feet.
Tighten the screws with a torque of 200 Nm (147.5 Ft-Lb)
The base must be perfectly flat and rigid enough as not to allow bending or misalignment on the pump coupling and
axis/transmission due to torque transmitted during operation.
Two lifting brackets are mounted on the pump for easy installation, as per the figure below.
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MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 10
The pump’s shaft (PTO) must not be rigidly connected to the motor unit.
The following transmission types are suggested:
• Flexible joint
• Cardan Joint (please respect the maximum working angles indicated by the manufacturer)
• Belts; for correct application, please contact the Customer Service Department.
Replace the oil filling hole closing service plug positioned on the rear casing cover with the
plug with oil dipstick. Check the correct quantity.
The dipstick must always be reachable, even when the unit is assembled.
The brackets are sized soley for pump lifting and therefore are absolutely not permitted for use
of additional loads.
Gounding: It is necessary to fix a grounding cable to the pump by means of the M8 stainless steel
screw and the stainless steel toothed washer properly marked by the YELLOW label. See the “ATEX
EXPLOSION PROTECTION” manual.
In all cases, the transmission must be properly assembled to avoid incorrect or harsh operation of the
connection parts and prevent excessive wear, an increase in temperature and/or hazardous breakages
that may create potential sources of ignition and explosion. See the “ATEX EXPLOSION PROTECTION”
manual.
9.2 Direction of rotation
The PTO rotation is indicated by an arrow located on the reduction gear cover. From a position facing the pump head,
the rotation direction will be as in fig. 5.
9.3 Version Change and Reducer Positioning
A right version pump is defined when: observing the pump from the head side, the PTO shank of the pump shaft is on
the right side.
A left version pump is defined when: observing the pump from the head side, the PTO shank is on the left side.
See fig. 5.
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MF SERIES
GENERAL PUMP A member of the Interpump Group
The version may be changed only by trained and authorized personnel by carefully
following the instructions in the repair manual.
1. Separate the hydraulic part from the mechanical part as indicated in Chapter 2 in points 2.2.1 and 2.2.2 of the
Repair Manual.
2. Turn the mechanical part 180oand reposition the rear casing cover in such a way that the oil dipstick is turned
upward. Reposition the lifting bracket and relative hole closing plugs in the upper part of the casing. Invert
the two inspection covers, ensuring that the open one is positioned lower. Finally, properly reposition the
specification label in its housing on the casing.
Make sure that the lower inspection cover draining holes are open.
3. Reassemble the hydraulic part to the mechanical part as indicated in Chapter 2 in points 2.2.1, 2.2.4 and 2.2.5 of
the Repair Manual.
It is also possible to place the reduction gear in 5 different positions as per fig. 6.
The reducer’s position may be changed only by trained and authorized personnel by carefully
following the instructions in the repair manual.
Page 11
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MF SERIES
GENERAL PUMP A member of the Interpump Group
9.4 Hydraulic Connections
In order to isolate the system from the vibrations produced by the pump, we advise to build the first section of the duct
near the pump (both for intake and delivery) with flexible hose. The consistency of the intake section must allow to avoid
deformation caused by the depressurization produced by the pump.
9.5 Pump Power Supply
MF pumps must always be installed with a positive suction head i.e. they must receive water by gravity or by forced
feeding, and never suctioned from a lower level. The pumps can tolerate minimum NPSH even as low as 1 m. (3.28 ft.),
however, to obtain a better volumetric efficiency and above all to avoid cavitation, the minimum NPSH available, mea-
sured at the pump inlet flange, will have to be at least equal or higher than the values shown in the chart below.
MF45 MF50 MF55
NPSHr(ft) 7.5 8 9
Forced feeding by a booster pump is highly recommended in order to avoid cavitation, considering the geometry of the
hydraulics and the considerable flow rates.
The booster pump must have the following specifications: flow rate at least double the rated flow rate of the pump, and
pressure between 30 to 40 PSI (2 to 3 Bar). These feeding conditions must be respected at any operating RPM.
Page 12
The booster pump must always be started up before the plunger pump. In order to protect the
pump, we advise to install a pressure switch on the feeding line after the filters.
9.6 Suction Line
For the pump’s correct operation, the suction line must have the following characteristics:
1. Minimum internal diameter as indicated in the diagram in paragraph 9.9, and in any case equal or greater than
the pump head’s value.
Along the duct, avoid localized diameter reductions that may cause pressure drops with
subsequent cavitation. Absolutely avoid 900elbows, connections with other hoses, bottlenecks, counter-slopes,
upside down “U” shaped curves, “T” connections.
2. With a layout that is set in such a way to prevent cavitation.
3. It should be perfectly airtight, and built in a way that guarantees perfect sealing over time.
4. Avoid pump emptying when stopping (even partial emptying).
5. Do not use hydraulic fittings, 3 or 4 way fittings, adapters, swivel joints, etc., since they may hinder the pump’s
performance.
6. Do not install Venturi tubes or injectors for detergent intake.
7. Avoid the use of base valves or any other type of one-way valves.
8. Do not connect the by-pass line from the valve directly to the pump suction line.
9. Provide appropriate baffle plates inside the tank in order to avoid water flows coming from both the by-pass and
feeding lines which may create turbulance near the tank’s outlet port.
10. Make sure that the suction line is perfectly clean inside before connecting it to the pump.
11. The pressure gauge for checking booster pressure must be installed near the plunger pump’s inlet port, and always
downstream from the filters.
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MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 13
9.7 Filtering
On the suction line, install two filters as indicated in fig. 7 and fig. 7/a.
With the manual adjustment valve:
The filter must be installed as close as possible to the pump, should allow easy inspection and have the following
characteristics:
1. Minimum capacity 3 times greater than the pump’s rated flow value.
2. Filter port diameters must not be smaller than the pump inlet ports.
3. Filtration degree ranging between 200 and 360 µm.
In order to guarantee correct pump operation, it is important to plan periodical cleaning of the filter
depending on actual pump usage, water quality and actual clogging conditions.
With the pneumatic adjustment valve:
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MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 14
9.9 Internal Diameter of the Hose Line
To determine the internal diameter of the hose, please refer to the following diagram.
Suction Hose
With a flow rate of ~105 GPM (400 l/mn) and water speed of 1 m/sec. the diagram line that connects the two scales
intersects the central scale, indicating the diameters, at a value of ~ 3.5 inch (90 mm).
Delivery Hose
With a flow rate of ~105 GPM (400 l/mn) and water speed of 5.5 m/sec. The diagram line that connects the two scales
intersects the central scale, indicating the diameters at a value of ~ 1.6 inch (40 mm).
Optimal speed to be obtained with the booster pump:
• Suction: ≤ 1 m/sec.
• Delivery: ≤ 5.5
The diagram does not take into account the hose and valve resistance, the pressure drop due to the pipe length,
the viscosity and the temperature of the pumped fluid. If necessary, contact our Customer Service Department.
9.8 Outlet Line
To obtain a correct delivery line, please comply with the following installation instructions:
1. The internal diameter of the hose must allow to guarantee correct fluid speed; see digram in paragraph 9.9
2. The first section of the hose connected to the pump must be flexible in order to isolate pump vibrations
from the rest of the system.
3. Use high pressure hoses and fittings that guarantee wide safety margins in any working condition.
4. Install a safety valve on the delivery line.
5. Use pressure switches suitable for the pulsating loads typical of plunger pumps.
6. In the design phase, take into proper account the pressure drop along the line, since this causes a reduction in
usage pressure with respect to the value measured at the pump.
7. If the pump pulsations are harmful for particular applications, install an appropriately sized pulsation dampener on
the outlet line.
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MF SERIES
GENERAL PUMP A member of the Interpump Group
Page 15
9.10 V-belt Transmission
As indicated in paragraph 9.1, only in exceptional cases may the pump be driven by a v-belt system. For correct lay-out
sizing, please contact our Customer Service Department.
9.11 Transmission of power from the second PTO
Upon request the MF series pump can be supplied with an auxiliary PTO on the opposite side to drive.
Transmission can be carried out:
- By means of V-belts
- By means of a coupling
With V-Belts, Max Torque output is: 110 ft/lb (150 Nm) corresponding to 17 HP (12.5 kW) at 800 rpm.
With coupling, Max Torque output is: 162 ft/lb (220 Nm) corresponding to 25 HP (18.4 kW) at 800 rpm.
With transmission by means of coupling, pay close attention to perfectly align, so that no transverse
forces are generated on the pump shaft. If necessary, contact our Customer Service Department.
10. START-UP AND OPERATION
10.1 Preliminary Inspections
Before Start-up Be sure that:
The suction line is connected and up to pressure (see Chapter 9) the pump must never run dry.
1. The suction line must be perfectly airtight.
2. All the On-Off valves between the pump and the feeding source are completely open. The delivery line must
discharge freely in order to allow the air in the pump to be expulsed easily, thus facilitating pump priming.
3. All suction/delivery connections and fittings must be correctly tightened.
4. Coupling tolerances on the pump/transmission axis (half-joint misalignment, Cardan joint tilt belt
tightening, etc.) must remain within the limits indicated by the transmission Manufacturer.
5. The pump’s oil level must be verified using the correct dipsticks (position 1, fig 8).
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MF SERIES
GENERAL PUMP A member of the Interpump Group
In case the pump has not run for a long period of time, recover the correct operation of the suction valves
by opening the three valve-lifting devices (see position 2, fig. 9). Be sure to reclose the valves before the
pump start-up. See fig. 10 for “work” and “rest” positions.
Page 16
10.2 Start-up
1. When starting the pump for the first time, check for the correct direction of rotation.
2. Verify correct feeding pressure.
3. The pump must be started off-load.
4. During operation, check that the rotating speed does not exceed the rated value.
5. Before putting the pump under pressure let it run for at least 3 minutes.
6. Before stopping the pump, release the pressure by acting on the adjustment valve or on any discharging device.
11. PREVENTIVE MAINTENANCE
PREVENTIVE MAINTENANCE
EVERY 500 HOURS EVERY 1500 HOURS
Check oil level Change oil
Check / Replace:*
Valves
Valve seats
Valve springs
Valve guides
Check / Replace:
H.P packings
L.P. packings
To guarantee pump reliability and efficiency, comply with the maintenance intervals as indicated in the table below.
* For replacement follow instructions contained in the repair manual.
Attention: On pumps without reduction unit, replace bearings and the corresponding seal rings
every 7000 hours of operation. On pumps with a reduction unit, replace all the bearings and the
corresponding seal rings every 10000 hours of operation. Perform periodical checks on cleaning
and maintenance on the pump. See the “ATEX EXPLOSION PROTECTION” manual.
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MF SERIES
GENERAL PUMP A member of the Interpump Group
12. PUMP STORAGE
12.1 Filling the Pump With An Anti-Corrosion Emulsion or Anit-freeze By Using An External Diaphragm Pump
As In The Layout Shown in Paragraph 9.7.
a) Close the filter draining, if open.
b) Be sure that the connecting hose is clean, spread with grease and connect it to the high pressure outlet port.
c) Fit a suction hose to the diaphragm pump. Open the pump suction connection and fit hose between it and the
diaphragm pump.
d) Fill the container with the solution/emulsion.
e) Put the free extremeties of the suction line and the high pressure outlet hose inside the container.
f) Start up the diphragm pump.
g) Pump the emulsion until it comes out of the high pressure hose.
h) Continue pumping for at least another minute; if needed, the emulsion can be reinforced by adding, for example,
Shell Donax
i) Stop the pump, remove the hose from the suction connection and close it with a plug.
j) Remove the hose from the high pressure outlet port. Clean, grease and plug both connections and the
hoses.
12.2 Hoses
a) Before greasing and protecting the hoses according to the previously described procedure, dry the connections
using compressed air.
b) Cover with polyethelene.
c) Do not wrap them too tightly; be sure there is no bending.
Page 17
13. PRECAUTIONS AGAINST FREEZING
In areas and periods of the year where there is risk of freezing, follow the instructions indicated in Chapter 12
(see paragraph 12.2).
In the presence of ice, do not start the pump for any reason unitl the circuit has been fully defrosted,
otherwise there can be serious damage to the pump.
14. WARRANTY TERMS
The pump is guaranteed for a period of 5 years from the delivery date, with the exception of parts subject to wear. In
any case, please refer to the contract terms for other warranty conditions. The warranty is void if:
a) The pump has been used for purposes that differ from that agreed.
b) The pump has been fit with an electric or diesel engine with performance greater than that indicated in the table.
c) The required safety devices were un-adjusted or disconnected.
d) The pump was used with accessories or spare parts not supplied by General Pump.
e) Damage was caused by:
1) improper use
2) the non-observance of maintenance instructions
3) use not compliant with operating instructions
4) insufficient flow rate
5) faulty installation
6) incorrect positioning or sizing of the hoses
7) non-authorized design changes
8) cavitation
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MF SERIES
GENERAL PUMP A member of the Interpump Group
15. TROUBLESHOOTING
The pump does not produce any noise at start-up:
• The pump is not primed and is running dry
• There is no water in the inlet line
• The valves are blocked
• The delivery line is closed and does not allow the air in the pump to be discharged
The pump pulses irregularly (knocking):
• Air suction
• Insufficient feeding
• Bends, elbows, fittings along the suction line obstruct the fluid’s passage
• The inlet filter is dirty or too small
• The booster pump, where provided, supplies insufficient pressure or flow rate
• The pump is not primed due to insufficient head or the delivery line is closed during priming
• The pump is not primed due to valve seizing
• Worn valves
• Worn pressure packings
• Incorrect operation of the pressure adjustment valve
• Transmission problems
The pump does not deliver the rated flow / is noisy:
• Insufficient feeding (see the causes listed above)
• RPM are less than the rated flow
• Excessive amount of water by-passed by the pressure adjustment valve
• Worn valves
• Leakage from the pressure packings
• Cavitation due to:
1) Wrong sizing of the suction hose/
undersized diameters
2) Insufficient flow rate
3) High water temperature
Insufficient pump pressure:
• The nozzle (or has become)too large
• Insufficient RPM
• Leakage from the pressure packings
• Incorrect operation of the pressure adjustment valve
• Worn valves
Overheated pump:
• The pump is overloaded (pressure or RPM exceed the rated values)
• Oil level is too low, or the oil is not of a suitable type, indicated in Chapter 7 (see paragraph 7.4)
• Incorrect alignment of the joint or pulleys
• Excessive inclination of the pump during operation
Pump vibrations or knocking:
• Air suction
• Incorrect operation of the pressure adjustment valve
• Valve malfunction
• Irregular drive transmission motion
Page 18
Ref 310069 Rev. B
07-18

Page 19
GENERAL PUMP A member of the Interpump Group
16. EXPLODED VIEW AND PARTS LIST
MF45/50/55 SERIES
Ref 310069 Rev. B
07-18

Page 20
GENERAL PUMP A member of the Interpump Group
MF45/50/55 SERIES
REPAIR KITS
Item Part # Description QTY.
50 F73150022 CLOSED INSPECTION COVER 1
51 F73050636 PLUNGER GUIDE ROD 3
52 F90414800 OR Ø 202.8X3.53 2
53 F73150122 OPEN ISPECTION COVER 1
54 F90168500 RAD. RING Ø 40.0X72.0X7.0/8.5 3
55 F99188400 SCREW M6X20 12
56 F73010213 PUMP CASING 1
57 F79050443 PLUNGER GUIDE 3
58 F73210674 LIFTING BRACKET 2
59 F99513000 SCREW M16X30 4
60 F73030301 CONNECTING ROD ASSY. 3
61 F99378800 CONNECTING ROD SCREW 6
63
F90928300
F90928100
F90928200
CONROD HEAD SEMI-BUSHING LOWER - INF
CONROD HEAD SEMI-BUSHING LOWER +0.25
CONROD HEAD SEMI-BUSHING LOWER +0.50
3
64
F90928000
F90928400
F90958500
CONROD HEAD SEMI-BUSHING UPPER - INF
CONROD HEAD SEMI-BUSHING UPPER +0.25
CONROD HEAD SEMI-BUSHING UPPER +0.50
3
65 F90917300 CONROD BUSHING 3
66 F90069700 STOP RING Ø 35 6
67 F97745000 SPINDLE 3
68 99183700 SCREW M6X14 4
69 98206000 HOLE PLUG Ø 15 6
70 F98233500
F98233600
OIL FILLING PLUG G1”
OIL FILLING PLUG G1” - ATEX 1
71 90361600 OR Ø 34.65X1.78 1
72 F73210295 TUBE FOR OIL FILLING PLUG, G1” 1
73 F91854000 CY. ROLLER BEARING 1
74
F10076735
F10076835
F10076935
F10082255
PINION, Z24 Ø 1.875, HELICOL
PINION, Z21 Ø 2.238, HELICOL
PINION, Z18 Ø 2.722, HELICOL
PINION, Z19 Ø 3.211, HELICOL
1
75 F97623000 TMP. CYL PIN. Ø 10.0X24.0 2
76 F90101000 STOP RING Ø 120 1
77 F91859900 ADJUST. ROLLER BEARING 1
78 F73210455 BEARING SUPPORT RING 1
79 F90081000 STOP RING Ø 55 1
80 F90172400 RAD. RING, Ø 55.0X75.0X8.0, VITON 1
81 F91500500 TAB, 14.0X9.0X60.0 1
82 F73210589 RING GEAR SUPPORT RING 1
83 9936700 SCREW M10X25 2
84 F91511000 TAB, 22.0X14.0X80.0 1
85 F74213255 RING GEAR STOP 1
86 F73020035 CRANKSHAFT C.70 1
87
F10077035
F10077135
F10077235
F10082355
RING GEAR, Z46 R.1.875 HELICAL
RING GEAR, Z47 R.2.238 HELICAL
RING GEAR, Z49 R.2.722 HELICAL
RING GEAR, Z61 R.3.211 HELICAL
1
88 F99371000 SCREW M10X40 15
89 F73210113 REDUCTION GEAR COVER 1
90 F90415000 OR, Ø 253.6X3.53 2
91 F73210013 REDUCTION GEAR BOX 1
92 F91881000 CY. ROLLER BEARING 2
93 F73210384 SIDE SEAL 2
94 F73160022 CASING COVER 1
96 F73150222 BEARING COVER 1
97 F99368600 SCREW M10X30 14
98
F98218700
F98218700
F98208150
PLUG G1/2”X10
PLUG G1/2”X10 - ATEX
PLUG G1/2”X13 - ATEX
2
1
1
99 F73200064 FOOT 2
100 F94540000 LEVER M8X107 1
101 F73215864 VALVE LIFTER BRACKET 1
102 F99301800 SCREW M8X10 2
103 F92221800 SCREW M8X1.5X5X13 2
Item Part # Description QTY.
1F73121115
F73121215
MANIFOLD (45-50)
MANIFOLD (55) 1
2 F10755401 VALVE OPENING DEVICE 3
3 96751400 WASHER Ø 21.5X27X1.5 5
4 F98218500 STEEL PLUG 3
5 F36206666 INLET VALVE HOUSING 3
6 F90527000 ANTI-EXTRUSION RING, Ø 61.2X67X2 3
7 F90410500 OR Ø59.62X3.53 3
9 F36208701 BALL VAVLE ASSY. 3
10 F36208951 INTERNAL VALVE GUIDE 3
11 F94769800 SPRING, Ø 41.5X37.9
3
12 F36206005 INLET VALVE GUIDE 3
13 F36715001 INLET VALVE UNIT 3
14 F90391100 OR Ø 66.35X2.62 3
15 F90528200 ANTI-EXTRUSION RING, Ø 68.0X72.0X1.5 3
16 F73221556 INLET VALVE PLUG 3
17 F73221415 INLET VALVE COVER 1
18 F73210915 OUTLET VALVE COVER 1
19 F90412000 OR, Ø 68.28X3.53 3
20 F36206766 OUTLET VALVE HOUSING 3
21 F90526000 ANTI-EXTRUSION RING Ø 51.5X56.0X1.5 3
22 F90389000 OR Ø 50.47X2.62 3
24 F36208801 BALL VALVE ASSY. 3
25 F36206766 INTERNAL VALVE GUIDE 3
26 F94760500 SPRING Ø28.5X32 3
27 F36206105 OUTLET VALVE GUIDE 3
28 F36207701 OUTLET VALVE UNIT 3
29
F73040309
F73040409
F73040509
PLUNGER Ø 45X117
PLUNGER Ø 50X117
PLUNGER Ø 55X117
3
30 F96710500 WASHER , Ø 10.0X18.0X0.9 3
31 F99383000 SCREW M10X140 3
32 F90411500 OR Ø 63.5X3.53 3
33 F90528550
F90527000
ANTI-EXTRUSION RING, Ø 72.9X77.0X1.5 (MF45-50)
ANTI-EXTRUSION RING, Ø 79.8X80.0X1.5 (MF55) 3
34 F90391400
F90391350
OR, Ø 72.69X2.62 (MF55)
OR, Ø 71.12X2.62 (MF45-50) 12
35 F90528650
F90528400
ANTI-EXTRUSION RING, Ø 74.9X79.0X1.5 (MF55)
ANTI-EXTRUSION RING, Ø 71.9X76.8X1.5 3
36
F73221856
F73221956
F73222056
CYLINDER SEAL Ø 45
CYLINDER SEAL Ø 50
CYLINDER SEAL Ø 55
3
37 701111 OR, Ø 10.78X2.62 6
38
F74100192
F74100292
F74100392
PISTON HEAD RING, Ø 45
PISTON HEAD RING, Ø 50
PISTON HEAD RING, Ø 55
3
39
90285000
F90286300
F90287300
SEAL RING, Ø 45.0X60.0X4.5/7.5 HP
SEAL RING, Ø 50.0X65.0X7.5/4.5 HP
SEAL RING, Ø 55.0X70.0X5.0/4.5 HP
3
40
F90284800
F90286500
F90287500
RESTOP RING, Ø 45
RESTOP RING, Ø 50
RESTOP RING, Ø 55
3
41
F73222170
F73222270
F73222370
CENTERING RING Ø 45
CENTERING RING Ø 50
CENTERING RING Ø 55
3
42 F73221691
F73221791
CENTERING HEAD BUSHING Ø 45-50
CENTERING HEAD BUSHING Ø 55 3
43 F90371000 OR, Ø 81.0X2.0 9
44
F73080056
F73080156
F73080256
BOTTOM RING Ø 45
BOTTOM RING Ø 50
BOTTOM RING Ø 55
3
45
F90284600
F90286000
F90287000
SEAL RING, Ø 45.0X53.0X5.5 LP
SEAL RING, Ø 50.0X58.0X5.5 LP
SEAL RING. Ø 55.0X63.0X5.5 LP
3
46 F99514200 SCREW M16X45 14
47 F99522500 SCREW M16X200 6
48 F99522200 SCREW M16X180 2
49 F96735500 WASHER Ø 16.0X65.0X1.0 3
KIT
NUMBER
F2312 (MF45)
Plunger Pack.
F2313 (MF50)
Plunger Pack.
F2314 (MF55)
Plunger Pack.
F2142
Inlet
Valve
F2062
Outlet
Valve
F2315 (MF45)
Complete Seals
F2316 (MF50)
Complete Seals
F2317 (MF55)
Complete Seals
F2150
Conn. Rod
F2151
Conn. Rod
F2153
Conn. Rod
F2152
Mounting
Feet
F2189
Valve lifter
junction
Positions
Included
32, 33, 34,
35, 37, 39, 40,
43, 45
32, 33, 34,
35, 37, 39, 40,
43, 45
32, 33, 34,
35, 37, 39, 40,
43, 45
13 28
6, 7, 14, 15,
19, 21, 22, 32,
33, 34, 35, 37,
39, 40, 43, 45,
52, 54, 71, 80,
90, 93
6, 7, 14, 15,
19, 21, 22, 32,
33, 34, 35, 37,
39, 40, 43, 45,
52, 54, 71, 80,
90, 93
6, 7, 14, 15,
19, 21, 22, 32,
33, 34, 35, 37,
39, 40, 43, 45,
52, 54, 71, 80,
90, 93
63, 64 63, 64 63, 64 59, 99 101, 102,
103
Ref 310069 Rev. B
07-18