Multiquip MTX70HF User Manual
OPERATION AND PARTS MANUAL
SERIES
MODEL MTX70HF
TAMPING RAMMER
(HONDA GX100UKRB5 GASOLINE ENGINE)
Revision #0 (03/08/12)
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
PAGE 2 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
NOTES
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 3
TABLE OF CONTENTS
MTX70HF Rammer
Proposition 65 Warning ........................................... 2
Parts Ordering Procedures ...................................... 5
Safety Information ................................................6-9
Specifications ........................................................ 10
General Information ............................................... 11
Components .......................................................... 12
Basic Engine .......................................................... 13
Inspection .............................................................. 14
Operation .......................................................... 15-16
Maintenance .......................................................... 17
Troubleshooting ................................................18-20
Explanation Of Code In Remarks Column............. 22
Suggested Spare Parts ......................................... 23
Component Drawings
Nameplates And Decals ................................... 24-25
Crankcase And Engine Assy ............................ 26-29
Guide Cylinder Assy ......................................... 30-31
Foot Assy .......................................................... 32-33
Fuel Tank And Handle Assy .............................. 34-35
Combination Lever Assy ................................... 36-37
Honda GX100UKRB5 Engine
Cylinder Barrel Assy..........................................38-39
Crankcase Cover Assy. ...................................... 4041
Crankshaft Assy. ............................................... 42-43
Piston/Conn. Rod Assy. .................................... 44-45
Camshaft Assy. ................................................. 46-47
Carburetor Assy. .............................................. 52-53
Air Cleaner Assy. .............................................. 54-55
Muffler Assy. ..................................................... 56-57
Flywheel Ignition Assy.......................................58-59
Control Assy. ..................................................... 60-61
Labels Assy. ...................................................... 62-63
Terms And Conditions Of Sale — Parts ................ 64
NOTICE
Specifications and part numbers are subject to change
without notice.
PAGE 4 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
PARTS ORDERING PROCEDURES
Ordering parts has never been easier!
If you have an MQ Account, to obtain a Username
Effective:
Choose from three easy options:
January 1st, 2006
Best Deal!
Order via Internet (Dealers Only):
Order parts on-line using Multiquip’s SmartEquip website!
■ View Parts Diagrams
■ Order Parts
■ Print Specifi cation 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)
Order via Phone:
Non-Dealer Customers:
Contact your local Multiquip Dealer for
parts or call 800-427-1244 for help in
locating a dealer near you.
and Password, E-mail us at: parts@multiquip.
com.
To ob tain an MQ Ac cou nt , co nta ct yo ur
District Sales Manager for more information.
Use the internet and qualify for a 5% Discount
on Standard orders 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 should contact
their local Multiquip Representatives for
Parts Ordering information.
Note: Discounts Are Subject To Change
Note: Discounts Are Subject To Change
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
NOTICE
All orders are treated as Standard Orders and will
ship the same day if received prior to 3PM PST.
❒ Specify Preferred Method of Shipment:
✓ UPS/Fed Ex ✓ DHL
■ Priority One ✓ Truck
■ Ground
■ Next Day
■ Second/Third Day
www.multiquip.com
WE ACCEPT ALL MAJOR CREDIT CARDS!
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 5
SAFETY INFORMATION
Do not operate or service the equipment before reading
Potential hazards associated with the operation of this
the entire manual. Safety precautions should be followed
at all times when operating this equipment.
Failure to read and understand the safety
messages and operating instructions could
result in injury to yourself and others.
SAFETY MESSAGES
The four safety messages shown below will inform you
about potential hazards that could injure you or others. The
safety messages specifi cally address the level of exposure
to the operator and are preceded by one of four words:
DANGER, WARNING, CAUTION or NOTICE.
SAFETY SYMBOLS
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.
equipment will be referenced with hazard symbols which
may appear throughout this manual in conjunction with
safety messages.
CAUTION
Indicates a hazardous situation which, if not avoided,
COULD result in MINOR or MODERATE INJURY.
NOTICE
Addresses practices not related to personal injury.
PAGE 6 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
GENERAL SAFETY
CAUTION
ALWAYS know the location of the nearest phone or keep a
Also, know the phone numbers of
This
information will be invaluable in the case of an emergency.
emergency or safety devices.
Disconnection of these devices can cause severe injury,
bodily harm or even death. Disconnection of any of these
use this machine on ground that is harder than
the machine can handle, or for driving pilings or tamping
rock beds. Furthermore, use of the machine on sloping
ground, such as the side of an embankment, may make
the machine unstable and can cause an accident. It can
Use the machine with confi dence for tamping earth and
use the machine
keep the machine in proper running condition.
store equipment properly when it is not being
used. Equipment should be stored in a clean, dry location
out of the reach of children and unauthorized personnel.
NEVER operate this equipment without proper protective
clothing, shatterproof glasses, respiratory protection,
hearing protection, steel-toed boots and other protective
devices required by the job or city and state regulations.
SAFETY INFORMATION
phone on the job site.
the nearest ambulance, doctor and fi re department.
RAMMER SAFETY
DANGER
NEVER operate this equipment when not
feeling well due to fatigue, illness or when
under medication.
NEVER operate this equipment under the infl uence of
drugs or alcohol.
ALWAYS check the equipment for loosened threads or
bolts before starting.
DO NOT use the equipment for any purpose other than
its intended purposes or applications.
NOTICE
This equipment should only be operated by trained and
qualifi ed personnel 18 years of age and older.
Whenever necessary, replace nameplate, operation and
safety decals when they become diffi cult read.
Manufacturer does not assume responsibility for any
accident due to equipment modifi cations. Unauthorized
equipment modifi cation will void all warranties.
NEVER use accessories or attachments that are not
recommended by Multiquip for this equipment. Damage
to the equipment and/or injury to user may result.
NEVER operate the equipment in an explosive
atmosphere or near combustible materials. An
explosion or fi re could result causing severe
bodily harm or even death.
WARNING
NEVER disconnect any
These devices are intended for operator safety.
devices will void all warranties.
DO NOT
also result in premature machine wear due to uneven
loads on the machine.
sand, soil, gravel, and asphalt. DO NOT
for other types of jobs.
CAUTION
NEVER lubricate components or attempt service on a
running machine.
NOTICE
ALWAYS know the location of the nearest
fi re extinguisher.
ALWAYS know the location of the nearest
fi rst aid kit.
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 7
ALWAYS
Fix damage to machine and replace any broken parts
immediately.
ALWAYS
SAFETY INFORMATION
ENGINE SAFETY
FUEL SAFETY
DO NOT add fuel to equipment if it is placed inside truck
start the engine near spilled fuel or combustible
fl uids. Fuel is extremely fl ammable and its vapors can
overfi ll tank, since spilled fuel could ignite if it
comes into contact with hot engine parts or sparks from
DANGER
The engine fuel exhaust gases contain poisonous carbon
monoxide. This gas is colorless and odorless, and can
cause death if inhaled.
The engine of this equipment
requires an adequate free fl ow
of cooling air. NEVER operate
this equipment in any enclosed
or narrow area where free fl ow
of the air is restricted. If the air
fl ow is restricted it will cause
injury to people and property
and serious damage to the
equipment or engine.
WARNING
D O NOT pl ace h ands or fingers inside engine
compartment when engine is running.
NEVER operate the engine with heat shields or
guards removed.
DANGER
bed with plastic liner. Possibility exists of explosion or
fi re due to static electricity.
DO NOT
DO NOT remove the engine oil drain plug
while the engine is hot. Hot oil will gush
out of the oil tank and severely scald any
persons in the general area of the rammer.
CAUTION
NEVER touch the hot exhaust manifold,
muffl er or cylinder. Allow these parts to cool
before servicing equipment.
NOTICE
NEVER run engine without an air fi lter or with a dirty air
fi lter. Severe engine damage may occur. Service air fi lter
frequently to prevent engine malfunction.
NEVER tamper with the factory settings
of the engine or engine governor. Damage
to the engine or equipment can result
if operating in speed ranges above the
maximum allowable.
cause an explosion if ignited.
ALWAYS refuel in a well-ventilated area, away from
sparks and open fl ames.
ALWAYS use extreme caution when working with
fl ammable liquids.
DO NOT fi ll the fuel tank while the engine is running
or hot.
DO NOT
the ignition system.
Store fuel in appropriate containers, in well-ventilated
areas and away from sparks and fl ames.
NEVER use fuel as a cleaning agent.
DO NOT smoke ar ound or near the
equipment. Fire or explosion could result
from fuel vapors or if fuel is spilled on a
hot engine.
PAGE 8 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
TRANSPORTING SAFETY
CAUTION
NEVER allow any person or animal to stand underneath
the equipment while lifting.
NOTICE
Before lifting, make sure that the equipment parts (hook
and vibration insulator) are not damaged and screws are
not loose or missing.
Always make sure crane or lifting device has been
properly secured to the lifting bail (hook) of the
equipment.
ALWAYS shutdown engine before transporting.
NEVER lift the equipment while the engine is running.
Tighten fuel tank cap securely and close fuel cock to
prevent fuel from spilling.
SAFETY INFORMATION
Use adequate lifting cable (wire or rope) of suffi cient
strength.
Use one point suspension hook and lift straight
upwards.
DO NOT lift machine to unnecessary heights.
ALWAYS tie down equipment during transpor t by
securing the equipment with rope.
Never allow any person or animal to stand underneath the
equipment while lifting.
ENVIRONMENTAL SAFETY
NOTICE
Dispose of hazardous waste properly.
Examples of potentially hazardous waste
are used motor oil, fuel and fuel fi lters.
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.
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 9
SPECIFICATIONS
Table 1. Rammer Specifications
Overall Height 40.04 in. (1017 mm)
Overall Width 13.78 in. (350 mm)
Over Length 28.1 in. (713 mm)
Shoe Size (W x L) 13.4 x 11.2 in. (340 x 285 mm)
Fuel Tank Capacity 2.1 qt. (2 liters)
Lubrication Oil Capacity 0.86 qt. (0.82 liter)
No. of Impacts Per Second 10.7 - 11.5
Impact Force 2,855 lbf (12.7 kN)
Impact Plate Stroke 2 - 3.2 in. (50 - 80 mm)
Operating Weight 163.13 lbs. (74 kg)
Measured Sound Power Level 104 dB
Guaranteed Sound Power Level 107 dB
Max. Sound Pressure Level 94 dB
Table 2. Engine Specifications
Model Honda GX100UKRB5 Engine
Type
Piston Displacement 6.0 cu.in. (98 cc)
Max. Output 3.0 hp/3,600 rpm (2.2 KW)
Max. Governed Speed, No Load 3,800 - 4,100 rpm
Cooling System Air-Cooled
Engine Oil Capacity 0.3 qt. (0.28 liters)
Fuel Unleaded gasoline
Lubricant for Engine Automobile Oil; Class SE or higher
Starting System Recoil Starter
Spark Plug Type NGK CR5HSB
Air-Cooled 4 Stroke, Overhead camshaft,
single cylinder gasoline engine
PAGE 10 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
GENERAL INFORMATION
DEFINITION OF TAMPING RAMMER
The Multiquip MTX70HF tamping rammer is a powerful
compacting tool capable of applying a tremendous force
in consecutive impacts to a soil surface. Its applications
include soil compacting for road, embankments and
reservoirs as well as backfilling for gas pipelines, water
pipelines and cable installation work.
The impact force of the MTX70HF levels and uniformly
compacts voids between soil particles to increase dry
density.
Circular motion is converted to create impact force.
The MTX70HF tamping rammer develops a powerful
compacting force at the foot of the rammer. To maintain
optimum performance, proper operation and service are
essential.
CONSTRUCTION OF TAMPING RAMMER
The MTX70HF is equipped with an air cooled, four- cycle
gasoline engine. Transmission of the power takes place
by increasing the engine speed to engage the centrifugal
clutch.
CAUTION
Before starting operation check the lifting
handle to:
1. Make sure that there is no damage on the bolts.
2. Make sure that there is no crack or breakage on
handle.
3. Make sure that there is no fissure on the surface.
If there is any abnormality or damage, replace
with new one.
For operation:
This handle is to be used to lift up the shoe part of
the machine with the body laid down on the ground
or truck bed.
1. Use proper lifting techniques to avoid back injury.
This handle is for manual lifting only.
2. Do not use this handle as a rammer lift point. Use
the lifting point on the top of the machine.
RAMMER GEARBOX AND SPRING CYLINDER
The MTX70HF uses an oil bath lubrication system. Always
check the oil level through the oil level sight glass at the
rear of the tamper foot.
CONTROLS
Before starting the MTX70HF Tamping Rammer identify
and understand the function of the controls.
3. Do not move the rammer with the lifting handle
and the front rollers more than 16 feet (5 meters).
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 11
COMPONENTS
3
2
10
5
6
4
1
9
11
7
8
Figure 1. MTX70HF Rammer
Figure 1 shows the location of the controls and components
for the MTX70HF Tamping Rammer. The functions of each
control is described below:
1. Combination (Throttle) Lever — Used to adjust
engine speed (rpm). Move lever forward (SLOW) to
reduce engine speed, move lever back toward operator
(FAST) to increase speed. Always operate the rammer
at full speed (rpm).
2. Handle — To operate rammer, GRIP handle assembly
firmly on both sides.
3. Fuel Tank Cap — Remove this cap to add unleaded
gasoline to the fuel tank. Make sure cap is tightened
securely. DO NOT over fill.
12
13
8.
Foot — Laminated wood with tempered steel plate for
superior shock absorption.
9.
Fuel Tank — Holds the fuel for the unit (up to 2.1quarts).
10. Muffler — reduces the noise of the engine when
running.
11. Engine — this unit uses a Honda GX100UKRB5
gasoline engine.
12.
Oil Gauge (Sight Glass) — Indicates the level of oil in
the oil bath reservoir.
13. Drain Valve — Open this valve to remove oil from the
bellows.
4. Hook — Used to lift rammer for transporting.
5. Air Cleaner Cover — Protects the air cleaner which
prevents dirt and other debris from entering the engine.
6. Roller — Allows rammer to be moved around easily
by rolling the unit.
7. Bellows — Reservoir for oil bath.
PAGE 12 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
WARNING
Adding fuel to the ta nk sho uld be
accomplished only when the engine is
stopped and has had an opportunity to
cool down. In the event of a fuel spill, DO
NOT attempt to start the engine until the
fuel residue has been completely wiped up, and the
area surrounding the engine is dry.
Figure 2. Honda GX100 Engine
BASIC ENGINE
The engine (Figure 2) must be checked for proper lubrication and filled with fuel prior to operation. Refer to the
engine manufacturer's manual for detailed operation and
service information.
1. Choke Lever — Normally used in starting the engine
in cold weather conditions. In cold weather, turn
the choke lever to the fully closed position. In warm
weather, set the choke lever halfway or completely
open.
2. Spark Plug — Provides spark to the ignition system.
Set spark plug gap to 0.024 - 0.028 inch (0.6 - 0.7 mm).
Clean spark plug once a week.
3. Recoil Starter (pull rope) — Manual-starting method.
Pull the starter grip until resistance is felt, then pull
briskly and smoothly.
NOTICE
Operating the engine without an air filter, with a
damaged air filter, or a filter in need of replacement
will allow dirt to enter the engine, causing rapid engine
wear.
4. Muffler — Used to reduce noise and emissions.
5. Dipstick/Oil Filler Cap — Remove this cap to
determine if the engine oil is low. Add oil through this
filler port as recommended in Table 3.
6. Oil Drain Plug — Remove this plug to remove oil from
the engine's crankcase.
WARNING
Engine components can generate
extreme heat. To prevent burns, DO
NOT touch these areas while the
engine is running or immediately
after operating. NEVER operate the
engine with the muffler removed.
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 13
INSPECTION
It is extremely important that this section be read carefully
before attempting to operate the rammer. DO NOT use
your rammer until this section is thoroughly understood.
CRANKCASE AND SPRING CYLINDER OIL BATH
This unit uses an oil bath lubrication system. Perform the
following:
1. Check the oil level through the oil level sight glass
(Figure 3) at the rear of the tamper foot.
OIL FILL PLUG
SIGHT GLASS
OIL DRAIN PLUG
Figure 3. Foot Housing Sight Glass
OIL LEVEL
DIPSTICK
Figure 5. Engine Oil Dipstick
2. Low levels of oil may result in engine seizure due to
high levels of consumption during operation.
3. Check the engine oil level and if the engine oil level is
low, it should be refilled. Use the proper motor oil as
suggested in the Table 3 below.
Table 3. Motor Oil Grade
Season or Temperature
Grade of motor oil
(higher than MS class)
NOTICE
The oil level should be kept at the half way point of the
sight glass.
2. If oil is not visible, add 10W-30 SE, SF or higher grade
motor oil into the oil fill plug opening (Figure 3). The
bath contains approximately 1.7 pints (820 cc.)
ENGINE
1. Fill the fuel tank (Figure 4) with unleaded gasoline. At
the same time, check the engine oil and make it a habit
to replenish it often (Figure 5).
FUEL
TANK
Spring, Summer or Autumn
+120° F to +15° F
Winter
+40° F to +15° F
Below +15° F SAE 10W-30
SAE 30
SAE 30
GENERAL INSPECTION
1. Check all nuts, bolts fasteners for tightness. Retighten
as necessary.
2. Clean any dirt from the recoil starter and foot pedestal.
Wipe the entire unit clean before operating.
3. Replace any missing or damaged Safety Operation
decals.
4. Adjust height of handle. Adjust handle by loosening
nuts and moving handle to suit operation. Retighten
nuts.
Figure 4. Fuel Tank
PAGE 14 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
OPERATION
CAUTION
Failure to understand the operation of the Tamping
Rammer could result in severe damage to the unit or
personal injury.
INITIAL STARTUP
When starting the MTX70HF Tamping Rammer perform
the following:
1. Slide the throttle lever from the stop to the idle position
( ) (Figure 6). This opens the fuel cock and the
engine electrical circuit is turned on automatically.
THROTTLE LEVER
(IDLE POSITION)
3. Grip the starter rope handle (Figure 8) and pull it until
you feel a slight resistance. Then pull sharply and
quickly. Return the handle to the starter case before
releasing.
STARTER
ROPE
Figure 8. Recoil Starter
4. If engine fails to start, move the choke lever (Figure 7)
to the half open position to avoid flooding.
5. Repeat steps 1 thru 4.
Figure 6. Throttle Lever (Idle Position)
2. Place the choke lever to the closed position. When the
weather is cold, close the choke all the way. When it
is hot, or if the engine is hot, open the choke a little or
leave it fully open (Figure 7).
CHOKE LEVER
(OPENED POSITION)
Figure 7. Choke Lever
6. If the engine does not start after repeated attempts,do
the following:
a. Check fuel delivery from fuel tank to carburetor.
b. Check for restrictions to fuel flow at in-tank filter.
c. Check for restrictions to fuel flow at in-line filter.
d. Inspect spark plug for contamination and proper
gap. Clean, adjust or replace spark plug as
required.
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 15
OPERATION
LEVER
POSITION)
OPERATION
1. To start the rammer tamping action, move the throttle
lever (Figure 9) quickly from IDLE to the START ( )
position. DO NOT move the throttle lever slowly as this
may cause damage to the clutch or spring.
THROTTLE LEVER
(START POSITION)
Figure 9. Throttle Lever (Start Position)
CAUTION
STOPPING THE ENGINE
1. Move throttle lever quickly from the START to IDLE
position (Figure 6) and run the engine for three minutes
at low speed. After the engine cools, move the throttle
lever to the STOP position (Figure 10). The engine will
stop and the fuel cock is automatically closed.
THROTTLE
(STOP
Figure 10. Throttle Lever (Stop Position)
Make sure that the throttle lever is moved to the FULL
START position. Operating the rammer at less than full
speed can result in damage to the clutch springs or foot.
2. The MTX70HF tamping rammer is designed to run
at 3,800 to 4,100 rpm. At optimum rpm the foot hits
at the rate between 590 - 695 impacts per minute.
Increasing throttle speed past factory set rpm does
not increase impacts and may damage unit. The
MTX70HF is designed to advance while tamping. For
faster advance, pull back slightly on the handle so that
rear of foot contacts soil first.
3. To stop the tamping action, move throttle lever quickly
from START to IDLE position (Figure 6).
2. If the engine does not stop due to a problem with the
switch or the like, move the machine to a safe location
and hold the throttle lever in the stop position. Let the
machine run on idle and the machine will stop after a
few minutes.
PAGE 16 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
Perform the scheduled maintenance procedures as indicated:
DAILY
Thoroughly remove dirt and oil from the engine and
control area.
Clean or replace the air cleaner elements as necessary.
Check and retighten all fasteners as necessary.
Check the spring box and bellows for oil leaks. Repair
or replace as needed.
EVERY 50 HOURS
Remove the fuel filter cap and clean the inside of the
fuel tank (Figure 11).
MAINTENANCE
PRIMARY
ELEMENT
Figure 12. Air Cleaner Primary Element
EVERY 200 HOURS
Remove the oil drain plug on foot housing (Figure 13) and
drain the oil. Refill with approximately 1.7 pint (800 cc)
of 10W-30 SE, SF or higher grade motor oil. Oil should
be midway in sight glass. Break in oil should be changed
after first 50 hours.
FUEL FILTER
Figure 11. Fuel Filter
Remove and clean the spark plug, then adjust the spark
gap to 0.024~0.028 inch (0.6~0.7 mm).
EVERY 80 TO 100 HOURS
Remove the air cleaner cover. Loosen and remove
the 2 screws that hold the cover to the air cleaner
assembly. If the primary element (Figure 12) is dirty,
wash it with gasoline or kerosene. Then dip it in engine
oil (SAE10W-30) and wring the element so that 25 to 30
cc of engine oil remains on the element.
OIL FILL PLUG
SIGHT GLASS
OIL DRAIN PLUG
Figure 13. Oil Drain Plug
EVERY 2 YEARS
Replace the fuel line every 2 years even if there is no
visible damage.
LONG TERM STORAGE
Slide the throttle lever to the STOP position.
Drain any fuel including in the fuel hose.
Replace lubrication oil and apply grease to lubrication
points.
Cover the air intake on the air cleaner and the exhaust
outlet on the muffler.
Store unit indoors covered with plastic sheet in moisture
free and dust free location out of direct sunlight.
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 17
Symptom Possible Problem Solution
Diffi cult to start, fuel is available, but no spark
at spark plug.
Diffi cult to start, fuel is available, and spark is
present at the spark plug.
Diffi cult to start, fuel is available, spark is
present and compression is normal.
Diffi cult to start, fuel is available, spark is
present and compression is low.
No fuel present at carburetor.
TROUBLESHOOTING
Troubleshooting (Engine)
Spark plug bridging? Check gap, insulation or replace spark plug.
Carbon deposit on spark plug? Clean or replace spark plug.
Short circuit due to defi cient spark plug
insulation?
Improper spark plug gap? Set to proper gap.
Fuel reaching carburetor? Check fuel line.
Water in fuel tank? Flush or replace fuel tank.
Fuel fi lter clogged? Replace fuel fi lter.
Stuck carburetor? Check fl oat mechanism.
Spark plug is red? Check transistor ignition unit.
Spark plug is bluish white?
No spark present at tip of spark plug?
No oil? Add oil as required.
Oil pressure alarm lamp blinks upon starting?
(if applicable)
ON/OFF switch is shorted? Check switch wiring, replace switch.
Ignition coil defective? Replace ignition coil.
Improper spark gap, points dirty? Set correct spark gap and clean points.
Condenser insulation worn or short circuiting? Replace condenser.
Spark plug wire broken or short circuiting? Replace defective spark plug wiring.
Wrong fuel type?
Water or dust in fuel system? Flush fuel system.
Air cleaner dirty? Clean or replace air cleaner.
Choke open? Close choke.
Suction/exhaust valve stuck or protruded? Reseat valves.
Piston ring and/or cylinder worn? Replace piston rings and/or piston.
Cylinder head and/or spark plug not tightened
properly?
Head gasket and/or spark plug gasket damaged? Replace head and spark plug gaskets.
No fuel in fuel tank? Fill with correct type of fuel.
Fuel cock does not open properly?
Fuel fi lter/lines clogged? Replace fuel fi lter.
Fuel tank cap breather hole clogged? Clean or replace fuel tank cap.
Air in fuel line? Bleed fuel line.
Check spark plug insulation, replace if worn.
If insuffi cient compression, repair or replace
engine. If injected air leaking, correct leak. If
carburetor jets clogged, clean carburetor.
Check transistor ignition unit is broken, and
replace defective unit. Check if voltage cord
cracked or broken and replace. Check if
spark plug if fouled and replace.
Check automatic shutdown circuit, "oil
sensor". (if applicable)
Flush fuel system, and replace with correct
type of fuel.
Torque cylinder head bolts and spark plug.
Apply lubricant to loosen fuel cock lever,
replace if necessary.
PAGE 18 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
Symptom Possible Problem Solution
Weak in power, compression is proper and
does not misfi re.
Weak in power, compression is proper but
misfi res.
Engine overheats.
Rotational speed fl uctuates.
Recoil starter malfunctions. (if applicable)
Starter malfunctions.
Burns too much fuel.
Exhaust color is continuously "white".
Exhaust color is continuously "black".
Will not start, no power with key "ON". (if
applicable)
TROUBLESHOOTING
Troubleshooting (Engine) - continued
Air cleaner dirty? Clean or replace air cleaner.
Improper level in carburetor? Check fl oat adjustment, rebuild carburetor.
Defective spark plug? Clean or replace spark plug.
Improper spark plug? Set to proper gap.
Water in fuel system?
Dirty spark plug? Clean or replace spark plug.
Ignition coil defective? Replace ignition coil.
Spark plug heat value incorrect? Replace with correct type of spark plug.
Wrong type of fuel? Replace with correct type of fuel.
Cooling fi ns dirty? Clean cooling fi ns.
Intake air restricted?
Oil level too low or too high? Adjust oil to proper level.
Governor adjusted incorrectly? Adjust governor.
Governor spring defective? Replace governor spring.
Fuel fl ow restricted? Check entire fuel system for leaks or clogs.
Recoil mechanism clogged with dust and
dirt?
Spiral spring loose? Replace spiral spring.
Loose, damaged wiring?
Battery insuffi ciently charged? Recharge or replace battery.
Starter damaged or internally shorted? Replace starter.
Over-accumulation of exhaust products?
Wrong spark plug?
Lubricating oil is wrong viscosity? Replace lubricating oil with correct viscosity.
Worn rings? Replace rings.
Air cleaner clogged? Clean or replace air cleaner.
Choke valve set to incorrect position? Adjust choke valve to correct position.
Carburetor defective, seal on carburetor
broken?
Poor carburetor adjustment, engine runs too
rich?
ON/OFF device not activated ON? Turn on ON/OFF device.
Battery disconnected or discharged?
Ignition switch/wiring defective? Replace ignition switch. Check wiring.
Flush fuel system and replace with correct
type of fuel.
Clear intake of dirt and debris. Replace air
cleaner elements as necessary.
Clean recoil assembly with soap and water.
Ensure tight, clean connections on battery
and starter.
Check and clean valves. Check muffl er and
replace if necessary.
Replace spark plug with manufacturer's
suggested type.
Replace carburetor or seal.
Adjust carburetor.
Check cable connections. Charge or replace
battery
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 19
TROUBLESHOOTING
Troubleshooting (Rammer)
Symptom Possible Problem Solution
Engine runs but rammer jumps
erratically or not at all.
Operating speed of throttle lever is
incorrectly set?
Oil in excess? Drain excess oil. Bring to correct level.
Clutch slips? Replace or adjust clutch.
Spring Failure? Replace spiral spring.
Speed of engine improper?
Soil over-compacted? Shut down machine and test soil.
Set throttle lever to correct position.
Adjust engine speed to correct
operating RPM setting.
PAGE 20 — MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12)
NOTES
MTX70HF RAMMER • OPERATION AND PARTS MANUAL — REV. #0 (03/08/12) — PAGE 21
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