Magnum MDP300 User manual

PORTABLE TRASH PUMPS
MDP300
OPERATING & PARTS MANUAL

2
INTRODUCTION
This manual provides information and procedures to safely operate and maintain the engine and pump. For your
own safety and protection from physical injury, carefully read, understand, and observe the safety instructions
described in this manual. The information contained in this manual was based on machines in production at the time
of publication. Magnum Products LLC reserves the right to change any portion of this information without notice.
DO NOT MODIFY or use this equipment for any application other than which it was designed for.
Magnum Products LLC recommends that a trained and licensed professional perform all electrical wiring and testing
functions. Any wiring should be in compliance with the United States National Electric Code (NEC), state and local
codes and Occupational Safety and Health Association (OSHA) guidelines.
Keep a copy of this manual with the unit at all times. Additional copies are available from Magnum Products LLC, or
can be found at www.m-p-llc.com. An engine operator’s manual was also supplied with the unit at the time of
shipment from the factory. The manual provides detailed operation and maintenance procedures for the engine.
Additional copies of the engine operator’s manual are available from the engine manufacturer.
MAGNUM PRODUCTS LLC
215 Power Drive • Berlin, WI 54923
U.S.A.
Phone: [phone]
FAX: [phone]
Toll Free: 1-800-926-9768
www.m-p-llc.com
For technical or parts QUESTIONS, please contact Magnum Products’ Customer Support or
Technical Support team at 920-361-4442 or toll free at 1-800-926-9768. Please have your serial
number available.
To ORDER SERVICE PARTS, please contact the dealer from which you purchased the unit, or call
Magnum Products to locate a dealer in your area.
Supplemental information may be available for your unit; when ordering parts ALWAYS check for a
supplement that applies to your unit. A supplement may have been provided with your unit and can
be found on the Magnum Products LLC website.
Engine Make:__________________________________________
Engine Serial Number:___________________________________
Engine Model Number: __________________________________
Unit Model Number:_____________________________________
Unit Serial Number: _____________________________________
WARNING
CALIFORNIA PROPOSITION 65 WARNING: Engine exhaust and some of its
constituents are known to the state of California to cause cancer, birth defects and
other reproductive harm.

3
TABLE OF CONTENTS
Page
INTRODUCTION ............................................................................................................................ 2
TABLE OF CONTENTS .................................................................................................................. 3
SAFETY NOTES ............................................................................................................................ 4
OPERATING SAFETY ...................................................................................................................4
ENGINE SAFETY ........................................................................................................................... 5
UNIT SERIAL NUMBER LOCATION .............................................................................................. 6
SAFETY SYMBOL SUMMARY ...................................................................................................... 6
SPECIFICATIONS .......................................................................................................................... 7
COMPONENT LOCATIONS .......................................................................................................... 8
HOSE RECOMMENDATIONS .......................................................................................................8
STARTING THE PUMP .................................................................................................................. 9
OPERATING THE PUMP ...............................................................................................................9
STOPPING THE PUMP .................................................................................................................. 9
MAINTENANCE SCHEDULE .......................................................................................................10
DAILY MAINTENANCE CHECKS AND TIPS ............................................................................... 10
ADDING ENGINE OIL ................................................................................................................. 11
CLEANING THE PUMP ................................................................................................................ 11
STORING THE PUMP .................................................................................................................. 11
UNIT ASSEMBLY AND PARTS ............................................................................................12 - 13
UNIT DECALS .............................................................................................................................. 14
NOTES ......................................................................................................................................... 15

4
SAFETY NOTES
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey allsafety
messages that follow this symbol to avoid possible injury or death.
This manual contains DANGERS, WARNINGS, CAUTIONS, NOTICES and NOTES which must be
followed to prevent the possibility of improper service, damage to the equipment, personal injury or death.
The following formatting options will apply when calling the readers attention to the DANGERS, WARN-
INGS, CAUTIONS, NOTICES and NOTES.
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 which, if not avoided, may result in minor or moderate injury.
NOTICE
Indicates a hazardous situation which, if not avoided, may result in property or equipment
damage.
Note: Notes contain additional information important to a procedure and will be found within the regular text body
of this manual.
OPERATING SAFETY
Before using the pump be sure to read and understand all of the instructions! This equipment was
designed for specific applications; DO NOT modify or use this equipment for any application other than
which it was designed for. Equipment operated improperly or by untrained personnel can be dangerous!
Read the operating instructions and familiarize yourself with the location and proper use of all instruments
and controls. Inexperienced operators should receive instruction from someone familiar with the equipment
before being allowed to operate or set up the pump. The following points should be practiced at all times:
• The area immediately surrounding the pump should be dry, clean, and free of debris.
•NEVER start a unit in need of repair.
•NEVER operate on a combustable surface.
•NEVER operate the pump if any of the following conditions exist during operation:
1. Noticeable change in engine speed.
2. Sparking occurs.
3. Engine misfires or there is excessive engine vibration.
4. Protective covers are loose or missing.
WARNING
Never pump volatile or corrosive chemicals or solutions with this pump. These fluids
could create serious safety, health and environmental hazards. High pressure
increases the chance of pump explosion which may result in serious personal injury.

5
ENGINE SAFETY
Internal combustion engines present special hazards during operation and fueling! Failure to follow the
safety guidelines described below could result in severe injury or death. Read and follow all safety warnings
described in the engine operator's manual. A copy of this manual was supplied with unit when it was
shipped from the factory.
•DO NOT run engine indoors or in an area with poor ventilation. Engine exhaust contains carbon
monoxide, a deadly, odorless and colorless gas which, if inhaled, can cause nausea, fainting or death.
Only use this unit outside and away from windows, doors and ventillation equipment.
•DO NOT fill fuel tank near an open flame, while smoking, or while engine is running. DO NOT fill tank
in an enclosed area with poor ventilation.
•DO NOT operate with the fuel tank cap loose or missing.
•DO NOT touch or lean against hot exhaust or engine parts.
•DO NOT clean air filter with gasoline or other types of low flash point solvents.
• Keep hands, feet and loose clothing away from moving parts on the engine.

6
UNIT SERIAL NUMBER LOCATION
Refer to the location illustrated below to find the unit ID tag. Important information, such as the unit serial and model
numbers are found on this tag. Record the information from this tag, so it is available if the tag is lost or damaged.
When ordering parts or requesting technical service information, you may be asked to specify this information.
SAFETY SYMBOL SUMMARY
This equipment has been supplied with numerous safety and operating decals. These decals provide important
operating instructions and warn of dangers and hazards. Replace any missing or hard-to-read decals and use care
when washing or cleaning the unit. Decal placement and part numbers can be found on page 14 of this manual.
Below is a summary of the intended meanings for the symbols used on the decals.
215 Power Drive • Berlin, WI 54923
1-800-926-9768
MODEL
SERIAL NUMBER
MDP 300
000000
kglbs.
WEIGHT
FLOW
Lpmgpm
CONNECTION SIZE
cmin.
TOTAL HEAD
mft.
DO NOT RUN PUMP DRY!
Unit ID Tag
Read and understand the
supplied operator’s manual
before operating unit.
Hot surface(s) nearby.
Fire/explosion hazard; Keep
open flames away from unit.
Use unleaded gasoline only.
Asphyxiation hazard; Operate
in well ventilated area.
Two-person lift only.
Safety alert symbol; Used to
alert you to potential personal
injury hazards.
Stop engine before fueling.
G
Impeller hazard.

7
SPECIFICATIONS
Read this manual carefully before attempting to use this pump. The potential for property damage, personal injury
or death exists if this equipment is misused or installed incorrectly. Read all of the manuals included with this unit.
Each manual details specific information regarding items such as set-up, use and service requirements. Specifica-
tions are subject to change without notice.
MAGNUM MODEL MDP300
Pump Output
Suction/Discharge Diameter .............................................................................3 in. (7.6 cm)
Maximum Discharge Head................................................................................105 ft. (32 m)
Maximum Suction Head....................................................................................25 ft. (7.6 m)
Maximum Discharge .........................................................................................264 gpm (1000 Lpm)
Engine Specifications
Engine Make .....................................................................................................Honda
Engine Model ....................................................................................................GX160
Net Power Rating* ............................................................................................4.8 hp (3.6 kW)
Approximate Run Time .....................................................................................3.3 hours
Capacities
Fuel Tank ..........................................................................................................0.82 gal. (3.1 L)
Weights and Dimensions
Dry Weight ........................................................................................................58 lbs. (26 kg)
Operating Weight .............................................................................................64 lbs. (29 kg)
Dimensions (L x W x H) ....................................................................................20.0 x 15.6 x 17.9 in.
508 x 396 x 455 mm
* The power rating of the engine indicated in this document is the net power output tested on a production engine
for the engine model and measured in accordance with SAE J1349 at 3600 rpm. Mass production engines may vary
from this value. Actual power output for the engine installed in the final machine will vary depending on numerous
factors, including the operating speed of the engine in application, environmental conditions, maintenance, and other
variables.
17.9 in.
15.6 in.
20.0 in.

8
COMPONENT LOCATIONS
HOSE RECOMMENDATIONS
HOSES
• Suction hoses must be rigid enough not to collapse when pump is operating.
• Discharge hoses need to be thin-walled and collapsible. Rigid hoses may also be used as discharge hoses.
Note: A small air leak from the suction hose will prevent the pump from priming. Be sure to properly connect and
secure the hose clamps before running the pump.
DISCHARGE
SUCTION
DRAIN
OIL FILL
MUFFLER
SPARK PLUG
AIR FILTER
FUEL TANK
PRIMING PORT
OIL FILL/
LEVEL CHECK
RECOIL STARTER

9
STARTING THE PUMP
Before starting the pump, add engine oil and gasoline. See page 11 for instructions on how to properly fill the unit
with engine oil.
1. Attach suction and discharge hoses.
DANGER
CARBON MONOXIDE: USING A GENERATOR INDOORS CAN KILL YOU IN MINUTES!
2. Fill up pump casing with water by removing the fill cap on top of the pump.
3. Open the fuel valve.
4. Turn engine switch on.
5. Open the throttle.
6. Pull starter rope.
7. As engine begins to warm-up, open choke.
8. Open throttle fully to operate.
OPERATING THE PUMP
The pump should begin pumping water within a minute. The longer the suction hose and higher the pump is above
water, the more time it will take to begin pumping.
If the pump does not prime, check for loose fittings or air leaks in the suction hose. Make sure strainer in water is
not blocked.
WARNING
Never pump volatile or corrosive chemicals or solutions with this pump. These fluids
could create serious safety, health and environmental hazards. High pressure
increases the chance of pump explosion which may result in serious personal injury.
STOPPING THE PUMP
1. Reduce engine rpm to idle by moving throttle to the right.
2. Turn engine switch off.
3. Close fuel valve.

10
MAINTENANCE SCHEDULE
The following maintenance schedule should be followed to ensure proper performance of the unit.
DAILY MAINTENANCE CHECKS AND TIPS
• Check the engine oil level daily before starting engine.
•DO NOT start the pump if the oil level is low! The normal operating level for the engine oil is when oil is
present on the crosshatch pattern of the dipstick. Add oil to the engine if it does not start or if oil is not present
on the dipstick when tested.
•DO NOT overfill the crankcase.
• Consult the engine operator’s manual for the proper grade of oil, including special operating conditions such
as a change in season or climate.
* After initial break-in, change the engine oil and filter. Oil change interval can then be extended to 100 hours.
Check engine oil level
Change engine oil
*
Check air filter

Clean air filter

Replace air filter
Check and adjust spark plug

Replace spark plug

Clean muffler/spark arrester

Check and adjust idle speed
Check and adjust valve clearance
Clean combustion chamber
Clean fuel tank and filter
Check fuel tube
Visual walk around inspection


Every 500 hours
Every 2 years
Every 1 year
ITEM DAILY
20
HRS.
50
HRS.
100
HRS.
500
HRS.
Check external hardware
Inspect hoses and housing for leaks



Clean cooling system






Check and adjust impeller clearance

11
ADDING ENGINE OIL
1. Place the pump on a firm, level surface.
2. Remove the oil fill cap/dipstick. Clean the area
around the oil fill cap and wipe the dipstick clean.
3. Insert the dipstick in oil filler neck. Do not thread
into filler neck. Remove the dipstick, and check
the oil level.
4. If oil is needed, carefully add oil to the bottom of
the oil filler neck, below the threads. While filling,
stop to check oil level. DO NOT overfill.
5. Insert oil fill cap/dipstick and secure tightly.
6. Check engine oil level before each use of the pump.
CLEANING THE PUMP
After running the pump in water containing dirt or debris, clean out the inside of pump housing.
1. Remove drain plug from pump housing. Drain any water left in the pump.
2. Remove the pump cover.
3. Clean out dirt and debris. Inspect impeller and volute for wear.
WARNING
Impeller may develop sharp edges. Use caution when cleaning around impeller to
avoid serious injury.
STORING THE PUMP
If the pump is to be stored for more than 4 weeks (30 days), please take the following actions in preparing the unit
for storage.
WARNING
Never open priming plug, discharge plug or cover when pump is hot, doing so may
result in severe burns.
NOTICE
Always drain the pump casing if the ambient air temperature is expected to drop below 32°F
(0°C).
1. After pump has cooled, remove drain plug from pump casing and drain out any remaining water.
2. Remove pump cover and clean inside of pump housing. Coat inside of pump with a light film of oil to reduce
corrosion.
3. Tape up suction and discharge ports to prevent anything from falling into pump.
4. Change engine oil.
5. Cover pump and engine. Store in a clean, dry area.
LOWER
LIMIT
UPPER
LIMIT

12
12
3
1
26
45
6
8
5
4
1
7
910
11
13
14
12
15
20
19
18
17
16
1
21
22
23
24
25
25
24
26
UNIT ASSEMBLY AND PARTS

13
ITEM PART QTY DESCRIPTION NOTES
1 41830 15 Spring washer
2 41822 1 Suction flange
3 41821 1 Check valve
4 41827 2 Cap plug
5 41829 2 O-ring, 24mm
6 41818 1 Casing
7 41824 1 Packing
8 41823 1 Delivery flange
9 41819 1 Packing, U-type
10 41817 1 Inner casing
11 41815 1 Impeller
12 41816 1 Mechanical seal
13 41820 1 O-ring, 195mm
14 41814 1 Casing cover
15 41831 4 Plastic washer
16 26615 1 Fuel tank
17 26616 1 Fuel filler cap
18 26610 1 Air cleaner element Under cover
19 26605 1 Spark plug
20 26618 1 Muffler
21 41834 1 Roll cage
22 41835 4 Rubber
23 41832 1 Strainer
24 41826 2 Coupling
25 41825 2 Fitting, nipple
26 41828 2 O-ring, 43mm
- 26611 1 Carb gasket set Not shown
- 26617 1 Fuel filter Not shown
- 26621 1 Muffler gasket Not shown
- 26622 1 Recoil starter spring Not shown
- 26623 1 Recoil starter rope Not shown

14
G
WARNING
ADVERTENCIA
AVERTISSEMENT
PRIME PUMP BEFORE STARTING.
Bomba primera antes de comenzar.
Pompe principale avant de commencer.
WARNING
ADVERTENCIA
AVERTISSEMENT
WARNING
ADVERTENCIA
AVERTISSEMENT
WARNING
ADVERTENCIA
AVERTISSEMENT
MDP 300
PN: 26562
Decal, small "M" - portables PN: 41946
Decal, MDP300
UNIT DECALS

15
NOTES
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REV: A
PART NO: 41861
05.27.09