Multiquip MQ41TDH User Manual

OPERATION AND PARTS MANUAL

MODEL MQ41TDH

DIESEL POWERED TRASH PUMP

(HATZ 1D81Z DIESEL ENGINE)

Revision #4 (08/15/08)

To find the latest revision of this

publication, visit our website at:

www.multiquip.com

THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.

PROPOSITION 65 WARNING

Diesel engine exhaust and some of

PAGE 2 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

REPORTING SAFETY DEFECTS

REPORTING SAFETY DEFECTS

If you believe that your vehicle has a defect that could cause a crash or could cause injury or
death, you should immediately inform the National Highway Traffic Safety Administration
(NHTSA) in addition to notifying Multiquip at 1-800-421-1244.
If NHTSA receives similar complaints, it may open an investigation, and if it finds that a safety
defect exists in a group of vehicles, it may order a recall and remedy campaign. However,
NHTSA cannot become involved in individual problems between you, your dealer, or
Multiquip.
To contact NHTSA, you may either call the Vehicle Safety Hotline toll-free at 1-888-327-4236
(TTY: 1-800-424-9153), go to http://www.nhtsa.dot.gov; or write to:

Administrator
NHTSA
1200 New Jersey Avenue S.E.
Washington, DC 20590

You can also obtain information about motor vehicle safety from http://www.safecar.gov.

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 3

TRAINING CHECKLIST

TRAINING CHECKLIST

This checklist will lists some of the minimum requirements for machine maintenance and operation. Please detach it and make
copies. Use this checklist whenever a new operator is to be trained or it can be used as a review for more experienced operator’s.

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DAILY PRE-OPERATION CHECKLIST

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MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 5

TABLE OF CONTENTS

Proposition 65 Warning ............................................. 2

Reporting Safety Defects .......................................... 3

Training Checklist ...................................................... 4

Daily Pre-Operation Checklist ................................... 5

Table Of Contents ..................................................... 6

Parts Ordering Procedures ....................................... 7

Rules For Safe Operation ...................................... 8-9

Operation and Safety Decals .................................. 10

Specifications .......................................................... 11

Components............................................................ 12

General Information ................................................ 13

Multiquip MQ41TDH — Diesel
Powered Trash Pump

Application ............................................................... 14

Pre-Setup (Pump) ................................................... 15

Initial Start-Up (Engine) ..................................... 16-18

Maintenance ...................................................... 19-22

Preparation For Long Term Storage ....................... 23

Troubleshooting (Pump).......................................... 24

Troubleshooting (Engine) ................................... 25-26

Explanation Of Codes In Remarks Column ............ 28

Suggested Spare Parts ........................................... 29

Name Plate And Decals ..................................... 30-31

Pump Assy. ........................................................ 32-35

Skid Assy. ........................................................... 36-37

Trailer-10 Assy. .................................................. 38-39

Trailer-1 Kit Assy. ............................................... 40-41

Whl-2 Kit Assy. ................................................... 42-43

TNKZZ Assy. (Optional Fuel Tank) ..................... 44-45

Hatz 1D81Z Diesel
Engine

Crankcase Assembly ......................................... 46-47

Crankcase Assembly (External Parts) ...............48-49

Crankshaft Assembly .........................................50-51

Camshaft Assembly ...........................................52-53

Piston/Rings Assembly....................................... 54-55

Cylinder Head Assembly .................................... 56-59

Flywheel Assembly ............................................60-61

Oil Pump Assembly ............................................ 62-63

Timing Cover Assembly ..................................... 64-65

Fuel Device ........................................................66-67

Air Ducting Assembly .........................................68-69

Breather Assembly .............................................70-71

Fuel Tank Assembly ........................................... 72-73

Fuel Pump Assembly .........................................74-75

Air Filter Assembly .............................................76-77

Exhaust Silencer ................................................ 78-79

Starter/Alternator Assembly ...............................80-81

Instrument Box Assembly ..................................82-83

Lifting Magnet/Stop Device ................................84-85

Terms and Conditions Of Sale — Parts .................. 86

NOTE

Specification and part number
are subject to change without
notice.

PAGE 6 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

PARTS ORDERING PROCEDURES

Ordering parts has never been easier!

Choose from three easy options:

Effective:

January 1

st

, 2006

Best Deal!

Order via Internet (Dealers Only):

Order parts on-line using Multiquip’s SmartEquip website!

■

View Parts Diagrams

■

Order Parts

■

Print Specification Information

Goto www.multiquip.com and click on

Order Parts

to log in and save!

Order via Fax (Dealers Only):

All customers are welcome to order parts via Fax.

Domestic (US) Customers dial:

1-800-6-PARTS-7 (800-672-7877)

Non-Dealer Customers:

Contact your local Multiquip Dealer for
parts or call 800-427-1244 for help in
locating a dealer near you.

Order via Phone:

If you have an MQ Account, to obtain a
Username and Password, E-mail us at:

[e-mail].

To obtain an MQ Account, contact your
District Sales Manager for more information.

internet

Use the
on

Standard orders

and qualify for a 5% Discount

for all orders which include

complete part numbers.*

Fax

your order in and qualify for a 2% Discount

on

Standard orders

for all orders which include

complete part numbers.*

Domestic (US) Dealers Call:

1-800-427-1244

International Customers

their local Multiquip Representatives for
Parts Ordering information.

Note: Discounts Are Subject To Change

Note: Discounts Are Subject To Change

should contact

When ordering parts, please supply:

❒❒

❒

❒❒

Dealer Account Number

❒

❒❒

❒❒

❒

Dealer Name and Address

❒❒

❒❒

❒

Shipping Address (if different than billing address)

❒❒

❒❒

❒

Return Fax Number

❒❒
❒❒

❒

Applicable Model Number

❒❒

❒❒

❒

Quantity, Part Number and Description of Each Part

❒❒

All orders are treated as

Standard Orders

and will ship the same day if received prior
to 3PM PST.

www.multiquip.com

WE ACCEPT ALL MAJOR CREDIT CARDS!

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 7

Specify Preferred Method of Shipment:

❒❒

✓

UPS/Fed Ex

■

Priority One

■

Ground

■ Next Day

■

Second/Third Day

✓ DHL
✓

Tr u c k

RULES FOR SAFE OPERATION

CAUTION:

■

Failure to follow instructions in this manual may
lead to serious injury or even death! This
equipment is to be operated by trained and

qualified personnel only! This equipment is for
industrial use only.

The following safety guidelines should always be used when
operating the MQ41TDH Trash Pump:

GENERAL SAFETY

■

DO NOT operate or service this equipment before
reading this entire manual.

■

This equipment should not be operated by persons under 18
years of age.

■

NEVER operate this equipment without proper
protective clothing, shatterproof glasses, steel-toed
boots and other protective devices required by the
job.

NEVER touch the hot exhaust manifold,
muffler or cylinder. Allow these parts to
cool before servicing engine or pump.

■

High Temperatures – Allow the engine to cool before adding
fuel or performing service and maintenance functions. Contact

hot

with

■

The air-cooled diesel engine of this pump requires an
adequate free flow of cooling air. Never operate the pump in
any enclosed or narrow area where free flow of the air is

components can cause serious burns.

restricted. If the air flow is
restricted it will cause serious
damage to the pump or

engine and may cause injury
to people and property.
Remember the pump's diesel
engine gives off DEADLY

gases.

■

NEVER operate this equipment when not feeling
well due to fatigue, illness or taking medicine.

■

NEVER operate this equipment under the
influence or drugs or alcohol.

■

NEVER use accessories or attachments, which are not
recommended by Multiquip for this equipment. Damage to
the equipment and/or injury to user may result.

■

Manufacture does not assume responsinility for any accident
due to equipment modifications.

■

Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.

■

Always check the machine for loosened threads or bolts before
starting.

■

■

■

Always refuel in a well-ventilated area, away from sparks and
open flames.

■

Always use extreme caution when
working with flammable liquids. When
refueling, stop the engine and allow it to
cool. DO NOT
machine. Fire or explosion could result from
fuel vapors, or if fuel is spilled on a hot
engine.

NEVER operate the pump/engine in an explosive atmosphere
or near combustible materials. An explosion or fire could result
causing severe

Topping-off to filler port is dangerous, as it tends to spill fuel.

bodily harm or even death.

smoke around or near the

PAGE 8 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

■

NEVER use accessories or attachments, which are not

■

recommended by Multiquip for this equipment. Damage to
the equipment and/or injury to user may result.

■

NEVER pump volatile, flammable or low flash point fluids.

■

These fluids could ignite or explode.

■

NEVER pump corrosive chemicals or water containing toxic
substances. These fluids could create serious health and
environmental hazards. Contact local authorities for
assistance.

■

NEVER open the priming plug when pump is hot. Hot water

inside could be pressurized much like the radiator of an
automobile. Allow pump to cool to the touch before loosening
plug.

■

NEVER open the pump housing during operation or start the

pump with the cover off. The rotating impeller inside the pump
can cut or sever objects caught in it.

■

NEVER block or restrict flow from discharge hose. Remove

kinks from discharge line before starting pump. Operation
with a blocked discharge line can cause water inside pump to
overheat.

■

NEVER Run engine without air cleaner. Severe engine

damage may occur.

■

Check the
bellows is pulled inwards this indicates restricted air flow,
replace air cleaner.

■

Always read, understand, and follow procedures in

Engine Operator’s Manual

equipment.

■

Always be sure the operator is familiar with proper safety
precautions and operations techniques before using pump.

■

Always store equipment properly when it is not being used.
Equipment should be stored in a clean, dry location out of the
reach of children.

air cleaner blockage indicator

before attempting to operate

daily. If the rubber

Hatz

■

Emergencies

■

Maintenance Safety

■

■

■

■

■

■

■

RULES FOR SAFE OPERATION

Always make sure pump is correctly secured to the trailer.
Check all supports attaching the pump to the trailer and make
sure they are tight.

Always make sure that the pump's trailer is placed on solid
level ground so that it cannot slide or shift around, endangering
workers. Place blocks under the trailer's bumper to make it
level (prevents tipping), and use a chocked block underneath
the wheels to prevents rolling. Also keep the immediate area
free of bystanders.

High Temperatures – Allow the engine to cool before adding
fuel or performing service and maintenance functions. Contact

hot

with

Always know the location of the nearest
and
Also know the phone numbers of the nearest

doctor

invaluable in the case of an emergency.

components can cause serious burns.

fire extinguisher

first aid kit

and

. Know the location of the nearest telephone.

fire department

ambulance

. This information will be

,

NEVER lubricate components or attempt service on a running
machine.

Always allow the machine a proper amount of time to cool
before servicing.

Keep the machinery in proper running condition.
Fix damage to the machine immediately and always replace

broken parts.
Dispose of hazardous waste properly. Examples of potentially

hazardous waste are used motor oil, fuel and fuel filters.
DO NOT use food or plastic containers to dispose of

hazardous waste.
DO NOT pour waste, oil or fuel directly onto the ground,

down a drain or into any water source.

■

Refer to the
technical questions or information.

■

Always fill the pump casing with water before starting the
engine. Failure to maintain water inside the pump housing
will cause severe damage to the pump.

■

In winter drain water from pump housing to prevent freezing.

Hatz Engine Owner's Manual

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 9

for engine

OPERATION AND SAFETY DECALS

Machine Safety Decals

The MQ41TDH Centrifugal Trash pump is equipped with a number of safety decals. These decals are provided for operator safety
and maintenance information. The illustration below shows these decals as they appear on the machine. If any of these decals
become unreadable, replacements can be obtained from your dealer.

PAGE 10 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

MQ41TDH — SPECIFICATIONS

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SOUND MEASUREMENTS

The required sound specifications, per Appendix 1, paragraph 1.7.4.f of the EC-Machine Regulations,
are defined as follows:

The sound pressure level at the operator's location (L) = 87 dB (A)

The sound power level (L) = 97 dB (A)

These sound values are determine according to ISO 3744 for the sound power level (L) and ISO
6081 for the sound pressure level (L) at the operator's location.

The sound measurements were obtained with the unit operation on pavement at nominal speed.

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 11

MQ41TDH — COMPONENTS

Figure 1. Pump Components

PAGE 12 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

MQ41TDH — GENERAL INFORMATION

The MQ41TDH Trash Pump is a self-priming centrifugal trash
pump powered by a 15 horsepower air-cooled four stroke HATZ
diesel engine. Both the intake (suction) and discharge ports on
the MQ41TDH incorporate a 4-inch diameter opening, which

Pump Clean-out

The clean-out cover on the MQ41TDH has been design for easy
removal that allows for easy access to the volute and impeller
for cleaning and servicing.

allows the pump to pump at a rate of approximately 611 gpm or
2,313 lpm.

Trash Pump

Trash pumps derive their name from their ability to handle a
greater amount of debris and solids than standard centrifugal
pumps. These pumps generally handle solids up to 1/2 the size
of the discharge opening making them less likely to clog. Also

Spark Arresters

State Health Safety Codes and Public Resources Codes specify
that in certain locations spark arresters be used on internal
combustion engines that use hydrocarbon fuels. A spark arrester
is a device designed to prevent accidental discharge of sparks
or flames from the engine exhaust. Spark arresters are qualified
and rated by the United States Forest Service for this purpose.

trash pumps are capable of handling water with 25% solids by
weight.

The advantage of using a trash pump is that it can be quickly
and easily disassembled in the field to remove debris in the
event the pump becomes clogged.

Suction Lift

This pump is intended to be used for dewatering applications
and is capable of suction lifts up to 25 feet at sea level. For
optimal suction lift performance keep the suction hose or line as
short as possible. In general always put the pump as close to the
water as possible.

Pump Support

The pump should always be placed on solid stationary ground
in a level position. To prevent the trailer from tipping, place blocks
under the trailer's bumper. In addition, place chock blocks behined

In order to comply with local laws regarding spark arresters,
consult the engine distributor or the
Administrator.

Mechanical Seal Lubrication

The pump uses a water-cooled mechanical seal to prevent water
from seeping into the engine. The passage of water through the
pump casing lubricates the seal and prevents it from overheating.
Never operate the pump without water in the casing as this will
cause the seal to fail.

Engine Safety

Internal combustion engines present special hazards during
operation and fueling! Failure to follow the safety guidelines
described in the Rules for Safe Operation section of this manual
and the Hatz Engine Operator's Manual could result in severe
injury or death.

each wheel to prevent the trailer from rolling.

Accessories

NEVER place the pump on

soft soil

connection should always be checked for tightness and leaks. A
small suction leak in the hose or fittings could prevent the pump
from priming.

. The suction hose or pipe

.

Multiquip offers a complete line of fittings, hoses, and clamps to
properly connect the pump to match various job conditions. Refer
to the part list in section 2 of this manual for a complete list of
accessories

Elevation

local Health and Safety

Elevations over 3,000 feet will effect the performance of the
pump. Due to less atmospheric pressure at higher altitudes,
pumps DO NOT have the priming ability that they have at sea
level.

A general rule of thumb is that for every 1,000 feet of elevation
above sea level a pump will lose one foot of priming ability.

For example, in Flagstaff, Arizona where the elevation is
approximately 7,000 feet, the pump would have a suction lift of
only 18 feet rather than the 25 feet at sea level.

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 13

MQ41TDH — APPLICATION

Figure 2 below shows a typical application using the MQ41TH Centrifugal Trash pump. Please note that this
pump is intended for the removal of clean water and water containing some debris and solids. Maximum size
of solids should not exceed 2 inches (50 mm) in diameter. DO NOT set strainer on bottom of water bed.
Placing the strainer above the water bed will prevent the pump from drawing in excessive amounts of sand
and foreign debris.

Figure 2. Pump Application

PAGE 14 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

MQ41TDH — PRE-SETUP (PUMP)

Before Starting

1. Read safety instructions at the beginning of manual.

2. Place pump as near to water as possible, on a firm flat, level
surface.

3. To prime pump, remove fill cap (Figure 1) and fill pump case
with water. If the pump case is not filled with water before
starting, it will not begin pumping.

NOTE

Pump case must be filled with water
before using pump. Otherwise pump will
not be able to begin pumping.

WARNING

5. The discharge hose is usually a
hose, however if a thin-walled discharge hose is not avail­able, a rigid suction hose can be substituted in its place.

6. Make sure the
securely attached to the water end of the suction hose. The
strainer is designed to protect the pump by preventing large
objects from being pulled into the pump.

CAUTION:

DO NOT open fill cap if pump

is hot! Water inside may be
under pressure.

NOTE

Suction and discharge hoses are available
from Multiquip. Contact your nearest dealer
for more information.

collapsible

suction strainer

The strainer should be positioned so it will

remain completely
pump with the strainer above water for long
periods can damage the pump.

(Figure 1) is clean and

under water

(thin-walled)

. Running the

CAUTION:

4. Check for
between the pump and engine housing, the seal inside the
pump may be worn or damaged. Continued operation of the
pump is not recommended. Further usage of the pump under
these conditions may cause severe water damage to engine.

Hoses and Clamps

1. Check that all hoses are
Make certain suction hose (Figure 1) does not have any air
leakage. Tighten hose clamps and couplings as required.

2. It is recommended that 2 clamps be used when securing the
suction hose to the inlet side of the pump.

3. Remember suction hoses must be
collapse when the pump is in operation.

4. Check that

Place hose so that it lays as straight as it is possible on the
ground. Remove any twists or sharp bends from hose which
may block the flow of water.

leaks

between pump and engine. If water is leaking

the

discharge

securely

hose (Figure 1) is not restricted.

attached to the pump.

rigid

enough not to

DO NOT pump flammable fluids, corrosive
chemicals or fluids containing toxic substances.
These fluids can create potentially dangerous
health and environmental hazards. Contact
local authorities for assistance.

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 15

MQ41TDH — INITIAL START-UP (ENGINE)

CAUTION :

DO NOT attempt to start the engine unless

the pump has previously been

primed

water. Severe pump damage will occur if
pump has not been primed.

Engine Oil

1. Make sure pump/engine is on level ground.

2. Pull the engine oil dipstick (Figure 3) from its holder.

ENGINE OIL
DIPSTICK

HOLDER

with

4. If engine oil is low, fill engine crankcase with lubricating
oil through filler hole (Figure 3), but do not overfill.

5. The oil listed in Table 3 is recommended to ensure better
engine performance. Use class CD or higher grade motor
oil.

Table 3. Oil Selection Chart

F

122

104

86

68

50

-14

-4

-22

-40

C

50

40

30

20

10

-10

-20

-30

-40

032

5W/30

OIL: SAE

5W/40

10W

10W/30

10W/40

15W/40

20W/20

40

30

Figure 3. Dipstick Location

3. Verify that oil level (Figure 4) is maintained between the
two notches on the dipstick.

Figure 4. Engine Oil Dipstick

PAGE 16 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

MQ41TDH — INITIAL START-UP (ENGINE)

Fuel

CAUTION :

Never fill the fuel tank while the engine is
running or in the dark. Fuel spillage on a
hot engine can cause a fire or explosion.
If fuel spillage occurs, wipe up the spilled
fuel completely to prevent fire hazards.

1. Determine if engine fuel is low by removing fuel cap
and looking inside tank. Fill with diesel fuel. DO NOT
fill the tank beyond capacity.

Speed Control Lever

1. Set the
half way between start and stop.

CAUTION :

DO NOT smoke while refueling, motor

fuels are highly flammable and can be
dangerous if mishandled.

Speed Control Lever

NOTE

Selecting a
smoke when starting.

lower

engine speed will reduce

(Figure 5) to a position

2. Handle fuel in a safety container. If the container does
not have a spout use a funnel.

3. Pay attention to the fuel tank capacity when replenishing
fuel. Refer to the fuel tank capacity listed on page 11,
Specification Table1.

4. Tighten fuel tank cap securely after filling.

Figure 5. Speed Control Lever

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 17

MQ41TDH — INITIAL START-UP (ENGINE)

Control Box

1. Insert ignition key into ignition switch located on control
box (Figure 6)

Figure 6. Control Box

2. Turn ignition key to position I, and verify that charge
indicator light comes ON.

3. Continue turning the ignition key through positions II
and III.

4. Release ignition key as soon as engine starts, and
verify that ignition key automatically returns back to
position I.

Operation

1. The MQ41TDH trash pump should begin pumping water
within a minute depending on the length of suction hose
and height the pump is above water.

2. If pump does not begin to pump water after a few
minutes, check for loose connections or air leaks in
suction hose. Make sure there is water in the pump end
and strainer is not clogged with debris, reference pump
troubleshooting guide on page 25.

Engine Shut-Down

1. Slow down the engine and allow to cool for at least 2
minutes. Place
and listen for the engine to stop running.

CAUTION :

NOTE

Longer suction hoses will require more time
for the pump to begin pumping water.

speed control lever

in the stop position

5. Verify charge indicator light goes
engine is started.

6. If charge indicator remains lit, increase engine speed
until light goes off. When the charge indicator light goes
off, it can then be assumed that the charging system is
working correctly .

7. If the charge light remains on while the engine is running,
refer to engine troubleshooting guide (pages 25-26) or
the

Hatz EngineInstructionManual.

8. Move

speed control lever

maximum engine speed. (See Fig. 5)

OFF

immediately when

to full start position for

2. Turn the ignition key to the 0 position and remove the
key from the ignition switch.

CAUTION :

NEVER attempt to stop the engine by

moving the decompression lever. Always
use the speed control lever to stop engine.

When pump is not in use, keep ignition
starting key in a safe place, out of the

reach of unauthorized persons.

PAGE 18 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

MQ41TDH — MAINTENANCE

General Inspection

The following maintenance guidelines are intended to assist
the operator in preventative maintenance. For a more detailed
maintenance schedule refer to the

Manual

At least

supplied with the pump.

daily

or prior to each use, the MQ41TDH trash

Hatz Engine Instruction

Changing Oil Filter

Change the engine oil filter (Figure 8) and gasket after 250
hours of operation. To gain access to the oil filter element,
unscrew the oil filter cap and replace the oil filter element.
Make sure to tighten oil filter cap securely.

pump cover should be removed, and the pump should be
cleaned and inspected for deficiencies. Check for loose,
missing or damaged nuts, bolts or other fasteners. Also check
for fuel or oil leaks, and remove any debris stuck in the
impeller or volute.

Check Oil Level

Check the engine crankcase oil level prior to each use, or
when the fuel tank is filled. Make sure the pump is level. The
oil level must be between the two notches on the dipstick
as shown in Figure 7.

OILDIPSTICK

SAFE OPERATING
OILLEVEL

MAX

Fuel Filter

Replace fuel filter (Figure 9) and drain fuel tank to remove
water and sediment every 500 hours. If the purity of the fuel

ADD ENGINE OIL

MIN

Figure 7. Engine Oil Dipstick

being used is of lesser quality replace fuel filter more often
as needed.

Changing Engine Oil

Change engine oil after first 25 hours of operation. Drain and
refill engine crankcase with the correct type and amount oil
(reference Table 3) after 250 hours of operation hours or once
a week thereafter.

When draining engine crankcase oil, place oil into a suitable
container while engine is still warm. Replace the drain plug
tightly. Add oil through the filler hole.

Figure 8. Oil Filter Element

Figure 9. Fuel Filter

NOTE

When re-installing fuel filter, please
note the arrows indicating the direction
of fuel flow.

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 19

MQ41TDH — MAINTENANCE

Air Filter Blockage Indicator

To test the air cleaner blockage indicator (Figure 10) run the
engine at full speed for a short time. If the rubber bellows is
pulled inwards (down), and the green rubber band cannot be
seen, this implies that maintenance work is required on the

To clean or replace air filter loosen the wing nut on the air
filter housing (Figure 11), remove the cover and take out air
filter cartridge. If only cleaning of the air filter is desired blow
through the air filter cartridge from the inside, moving a jet
of dry compressed air up and down until all dust is removed.

air cleaner. Clean or replace air cleaner.

CLEAN USING
COMPRESSED
DRYAIR

Figure 10. Air Filter Blockage Indicator

WING NUT

Air Filter Cartridge

AIR FILT ER
CANNISTER

AIR FILT ER
CARTRIDGE

Figure 11. Air Filter

If engine is operating in very dusty and dry grass conditions.
A clogged air filter will result in high fuel consumption, loss
of power and excessive carbon buildup in the combustion
chamber. Clean air filter daily. Remember if operating in dusty
conditions, check the rubber bellows on the air blockage
indicator several times a day.

CAUTION :

DO NOT blow high pressure, high velocity

compressed air thru the air filter cartridge. The
high velocity air will damage the filter, which
will then allow contaminates to pass into the
engine.

PAGE 20 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

MQ41TDH — MAINTENANCE

Pump Vacuum Test

CAUTION :

DO NOT attempt to start the engine unless the

pump has previously been
Severe pump damage will occur if pump has
not been primed.

To perform the pump vacuum test do the following:

1. Remove the pump fill cap, and fill the pump with water.

2. Start the engine as outlined in the initial strat-up section,
and wait for the pump to begin pumping.

3. As shown in Figure 12 (next page), place a water hose
inside the discharge opening of the pump, and turn on
the water. This flow of water into the discharge opening
will

prevent

4. Place the
the pump inlet opening (Figure 15) with the vacuum guage
facing upwards. It may be necessary to apply a small
amount of water around the rubber seal of the vacuum
tester to make a good suction fit.

the pump from running dry.

Pump Vacuum Tester

primed

(P/N 7000030) over

. with water.

5. Check and make sure that there are no air leaks between
the vacuum tester and the inlet port on the pump. If air
leaks are present reseat vacuum tester.

6. Run the pump for a few minutes while monitoring the
vacuum guage. If the guage indicates a reading between

-25 and -20 in. Hg. (inches of mecury) then it can be
assumed that the pump is working correctly.

7. If the vacuum tester guage indicates a reading

below

is not functioning correctly, and corrective action needs
to be taken.

6. To test 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 the engine
is restarted.

-20 in. Hg, it can then be assumed that the pump

flapper valve

, shut down the engine. The

NOTE

25 in. Hg (inches of mecury) translates
into 25 feet of lift at

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 21

sea level

.

MQ41TDH — MAINTENANCE

Figure 12. Pump Vacuum Tester

PAGE 22 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

Pump Storage

MQ41TDH — PUMP STORAGE

For storage of the pump for over 30 days, the following is
required:

z

Drain the fuel tank completely.

z

Run the engine until the fuel in the injection system is
completely consumed.

z

Completely drain used oil from the engine crankcase
and fill with fresh clean oil, then follow the procedures
described in the engine manual for engine storage.

z

Remove the drain plug from the pump and drain out any
water from left in the housing.

z

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.

z

Cover suction and discharge ports with duct tape to
prevent any foreign matter from falling into pump.

z

Cover pump and engine with plastic covering or
equivalent and store in a clean, dry place.

MQ41TDH — PREPARATIO

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 23

MQ41TDH — TROUBLESHOOTING (PUMP)

Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a
breakdown, use the table shown for pump troubleshooting guide (Table 4)and the engine troubleshooting guide (Table 5).
If the problem cannot be remedied, consult our company's business office or service plant.

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PAGE 24 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

MQ41TDH — TROUBLESHOOTING (ENGINE)

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MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 25

MQ41TDH — TROUBLESHOOTING (ENGINE)

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PAGE 26 —MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07)

NOTE PAGE

MQ41TDH TRASH PUMP — PARTS & OPERATION MANUAL — REV. #3 (04/02/07) — PAGE 27