MULTIQUIP MTX Service Manual

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SERVICE

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TOOLS ○ DISASSEMBLY DIAGRAMS ○ TROUBLESHOOTING

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Manual No. MTX2015SM

CCAALLIIFFOORRNNIIAA

Proposition 65 Warning:

Engine exhaust and some of its constituents, and some dust created by power
sanding, sawing, grinding, drilling and other construction activities contains
chemicals known to the State of California to cause cancer, birth defects and
other reproductive harm.

Some examples of these chemicals are:

 Lead and lead-based paint.
 Crystalline silica from bricks.
 Cement and other masonry products.
 Arsenic and chromium from chemically treated lumber.

Your risk from these exposures varies, depending on how often you do this type
of work. To reduce your exposure to these chemicals: ALWAYS work in a well
ventilated area, and work with approved safety equipment, such as dust mask
that are specially designed to filter out microscopic particles.

Multiquip Inc. ◦ MTX Series Rammers ◦ Manual No. MTX2015SM

MTX TAMPING RAMMER SERVICE MANUAL

Table of contents

Preface
Warning labels
Precautions for safety

Tool
Inspection procedure
Engine and oil
Rules for conduction service work
Disassembly and reassembly

Periodic checks and adjustments
Troubleshooting

Work area
Clothing and protective gear
Cautions during refueling
Preventing burns and
accidentally being caught in the machine
Tools and equipment,etc
Use of genuine parts and genuine oils
Tightening torque of bolts and nuts
Handling of wastes

Engine
Guide cylinder and Spring cylinder
Crankcase
Handle
Combination lever

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1

2. WARNING LABELS

1. PREFACE

Please read an instruction manual of a separate volume before work by all means in order to
get security of work when I do right driving, maintenance of TAMPING RAMMER and prepa­ration.

On the handling of an engine, please read an engine instruction manual and a preparation
manual of a separate volume.

This preparation commentary handwriting mentions the point of the resolution / assembling
in preparation of TAMPING RAMMER and a preparation standard.You read this preparation
commentary handwriting carefully before getting it ready, and please understand enough
structure / a function of each part.

For inquiries about repair parts, parts lists, service manuals, and repair of the
machine, please contact Multiquip dealer in your area. In addition, parts lists are
available on the MQ Service & Support Center website at: http://service.multiquip.com

●

●

●

●

The triangle shaped marks used in this manual and on the decals stuck on the main body
indicate common hazards. Be sure to read and observe the cautions described.

Warning labels indicating hazards to humans and to equipment.

Denotes an extreme hazard. It calls attention to a procedure,practice, condition
or the like, which, if not correctly performedor adhered to, is likely to result in
serious injury or death.

Denotes a hazard. It calls attention to a procedure, practice,condition or the like,
which, if not correctly performed or adhered to, could result in serious injury or
death.

Denotes a hazard. It calls attention to a procedure, practice, condition or the like,
which, if not correctly performed or adhered to, could result in injury to people
and may damage or destroy the product.

Precautions (without a triangular mark): Failure to follow the instructions may
result in damage to property.

！

WARNING:

！

CAUTION:

！

DANGER:

！

3.1 Work area

3. PRECAUTIONS FOR SAFETY

DANGER

！

Do not work in a poorly ventilated area such as indoors or inside a tunnel.
Exhaust from engines contains toxic substances such as carbon monoxide,
and it is very dangerous if those oisonous gases and dust are inhaled.
Also to maintain better ventilation, keep an appropriate distance from
buildings when operating this machine.

Do maintenance work in a place with a flat robust surface to keep the machine stable while
being maintained. Also select an area with sufficient space for maintenance work.

Before maintenance work, clean the floor thoroughly. Oil and other soiling left on the floor
may cause accidental fall.
For maintenance work, make sure the work area is well lighted.

A portable lamp to illuminate the work site has to be protected by wire.
If the lamp breaks, fuel and oil might ignite.

To prepare for emergency, the work area should be equipped with emergency
medical devices and fire extinguishers.

CAUTION

！

■

■

■

■

■

2

3.2 Clothing and protective gear

3.3 Cautions during refueling

DANGER

！

To make the work safe, wear work clothes that fit properly, and use protective gear such as
a helmet and safety boots appropriate for the work.
Work clothes that do not fit might be caught in the rotating parts, leading to an unexpected
injury.

When refueling, pay attention to the following points.

Spills might occur if the fuel is filled to the top. After refueling, tightly close the tank cap by
twisting it to the end.

Start your work only after the machine cools down completely.
The muffler, in particular, gets very hot, and an accidental burn might occur.
The engine and engine oil also get very hot, so be careful not to get a burn.

If you perform maintenance work with the engine running, you might be
accidentally caught in the rotating parts such as the clutch and gear.
Perform maintenance work after the engine is stopped.

Qualification is required for handling the crane. Only someone qualified to operate a crane
and do hooking work can handle the crane.

Before operating the crane, for safety reasons, check the machine parts (especially the hook
and anti-vibration rubber) for any damage and loosened or missing bolts.

Stop the engine while hoisting.

Use a sufficiently strong wire rope.

For safety reasons, do not hoist to a height that is highter than necessary.

Do not use a wire rope if it is damaged.

For hoisting, use only the one point hoisting hook, and do not hoist at
other parts (such as the handle).

When using a hydraulic shovel as a crane, never hoist up and down suddenly.

When the machine is hoisted, never allow people or animals underneath the crane.

For safety reasons, do not hoist to a height that is higher than necessary.
Be careful not to cause accidents while operating the hoisting equipment.
Also make sure the hoisting equipment is not malfunctioning.

Use appropriate tools. Using tools that do not fit the parts will not only damage the parts but
also cause unexpected injury.

■

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■

■

■

■

■

■

■

■

■

■

■

■

■

■

- Always refuel in a well ventilated area.
Make sure that the engine is stopped. Refuel after the engine cools down.

- Refuel on a flat surface area with no flammable objects around.
Be careful not to spill the fuel. If a spill occurs, wipe it well.

- Keep away from open fires while refueling.
(Smoking is strictly prohibited while refueling.)

CAUTION

！

3.4 Preventing burns and accidentally being caught in the machine

WARNING

！

3.5 Tools and equipment, etc

WARNING

！

3

3.6 Use of genuine parts and genuine oils

3.7 Tightening torque of bolts and nuts

Always use genuine parts and oils. The use of inappropriate parts will greatly shorten the life
of the machine, also resulting in unexpected accidents.

For tightening of bolts and nuts, use the tightening torque specified in this maintenance
manual. Over-tightening and the lack of torque will not only shorten the life of the machine
but also result in unexpected accidents such as breakage and break-down of the machine
while in use.

Store waste engine oil, lubrication oil and fuel in a container. Never release such wastes on
the ground or discharge them in side ditches. Handle them in compliance with the applicable
laws and other regulations.

her than necessary.
Be careful not to cause accidents while operating the hoisting equipment.
Also make sure the hoisting equipment is not malfunctioning.

Use appropriate tools. Using tools that do not fit the parts will not only damage the parts but
also cause unexpected injury.

■

■

■

CAUTION

！

WARNING

！

3.8 Handling of wastes

CAUTION

！

4

1. Wrench 6mm 8mm 10mm 12mm 13mm 14mm 17mm 19mm

Offset wrench/Socket wrench/Adjustable wrench

2. Hexagonal wrench / Hexagonal socket

5mm 6mm

3. External snap ring plier/Internal snap ring plier(bent type can be also used)

4. Screwdriver, flat and cross

5. Metal and plastic hammers

6. Sealing compound (Locktite 221 and 242)

7. Molybdenum grease

8. Grease for combination lever C1-Z (P/N:9800-10420)

10. Pressing machine

11. Special tool

Clutch puller “A”

(P/N:9810-10400)

Clutch puller “B”

(P/N:9839-10020)

Spring cylinder remover

(P/N:9830-10040)

Piston end remover

(P/N:9839-10010)

Clutch mounter

(P/N:9830-10060)

Piston rod holder

(P/N:9839-10090)

Socket head bolt 8X50

(Crank gear remover)

(P/N:0091-10044)

4. TOOL

5.2 Operating test

5.1 External appearance check

5. INSPECTION PROCEDURE

5

Installation of parts (loosened screw, defective parts, etc.)
Damage on machine
Oil check (level and contamination)
A. Engine oil (SAE10W-30 when shipped) (See operation manual for the engine)
B. Main body oil (SAE10W-30 when shipped) (See table 1)
Shock rubber for damage, crack, fatigue, hardening, etc.

Check for engine speed. (Idling and Operating speed)
Check for abnormal noise and jump during operation.

(1)
(2)
(3)

(4)

(1)
(2)

6. ENGINE AND OIL

Model

Engine type

Idling engine speed

Setting speed

Fuel tank capaity

Lubricant for Body

Capacity of Lubricant

for Body

Lubricant for Engine

Capacity of Lubricant

for Engine

Fuel

MTX-70

1900 - 2000

3800 - 4100

MTX-60

1900 - 2000

3800 - 4100

2 (2.1)

Honda

GX100U-KRBF

0.65 (0.69)

0.28 (0.30)

rpm

rpm

liters

(quart)

liters

(quart)

liters

(quart)

MTX-80

1900 - 2000

3400 - 3600

3 (3.2)

Automobile Oil SAE 10W-30; Class SE or higher

Automobile Oil SAE 10W-30; Class SE or higher

Unleaded Gasoline

MTX-90

1900 - 2000

3500 - 3700

Robin

EH12-2D46530

0.82 (0.87)

0.4 (0.42)

Table 1

7. RULES FOR CONDUCTING SERVICE WORK

6

Before removing or disassembly any parts or component, be sure to know exactly
how it was installed or assembled.
Disassembly work should be conducted working space where it is free from dust.
Protect the parts or component with sheet to avoid smearing or damaging during
service work.
Use proper tools and genuine parts in proper manner.
Level check or replacement of oil for main body and engine should be carried out
on level ground.
Replace the disassembled O-ring, oil seal, packing, gasket or the like with new one.
Do not reuse any bolts which it has been heated for disassembly.
Use the specified standard tightening torque (See Table 2) and bonding agent
(Loctite#221 and #242 or the like) when tightening the bolts and nuts.
And clean the bolts and nuts before tightening them or coating with bonding agent
to them.

(1)

(2)
(3)

(4)
(5)

(6)
(7)
(8)

Screw diameter

M6

M8

M10

M12

M14

The caller screws materials

Aluminum type

SS,FCD,

Aluminum type+Helisert

N.m

Kgf.cm

ft.lbf

N.m

Kgf.cm

ft.lbf

N

.

m

Kgf.cm

ft.lbf

N.m

Kgf.cm

ft.lbf

N.m

Kgf.cm

ft.lbf

11.8 - 14.7

120 - 150

8.7 - 10.8

24.5 - 29.4

250 - 300

18.1 - 21.7

58.8 - 68.6

600 - 700

43.4 - 50.6

98.1 - 107.9

1000 - 1100

72.3 - 79.6

117.7 - 127.5

1200 - 1300

86.8 - 94.4

14.7 - 17.7

150 - 180

10.8 - 13.0

32.4 - 35.3

330 - 360

23.9 - 26.0

73.5 - 78.5

750 - 800

54.2 - 57.9

112.8 - 122.6

1150 - 1250

83.2 - 90.4

166.7 - 176.5

1700 - 1800

123.0 - 130.2

Table 2Standard torque table

MTX-60
MTX-70

(Figure is MTX-70)

MTX-80
MTX-90

23

24

25-1

25-2

26

28

29

34

51

63

52

57

111

61

59

59

58

53

36

35

60

56

75

53

63

63

51

60

56

57

58

56

52

59

63

63

53

6359536662

34

36

35

25-1

111

23

24

25-2

82

79

28

29

272671

73

72

65

fig.1

8. DISASSEMBLY AND REASSEMBLY

8.1 Disassembly and reassembly the Engine

7

Remove the EX bar (57) by unscrewing 4 pcs
bolts (58).

Remove the muffler guard (52) and the link
guard (51) by unscrewing 4 pcs bolts (63)
and 2 pcs bolts (56).

Remove the engine guard (60) as per follow­ing terms
i) In case of MTX-60 / 70
Remove the engine guard (60) by unscrew­ ing 4 pcs bolts (61).

ii) In case of MTX-80 / 90
Remove the engine guard (60) by unscrew­ ing 4 pcs nuts (65) and 2 pcs bolts (72).

Disconnect the fuel hose from the carburetor
side. Disconnect the wire harness of
combination lever and the curl cord of hour &
tachometer from the engine. (fig.2)

Remove the speed control wire by loosening
a pan head screw and 2 pcs M6 nuts. (fig.3)

A.

B.

C.

D.

E.

(1) Disassembly

Remove the intake pipe (34) by loosening a
flat screw of cyclone clamp (35).

Remove the engine as per following terms.
i) In case of MTX-60 / 70

ii) In case of MTX-80 / 90

(1)

Unscrew 4 pce nuts (29) and remove
the engine from the crankcase slowly by
having it firmly with both of hands.

(2)

Remove the engine flange(26) by un­ screwing 4 pcs flange bolts (28).

(1)

Unscrew 2 pcs flange nuts (27) and 2
pcs bolts (28), and remove the engine
from the crankcase slowly by having it
firmly with both of hands.

(2)

Remove the engine flange (26) from the
crank case by unscrewing 4 pcs flange
bolts (29).

F.

G.

fig.2

Ground
terminal

wire harness
connector

Curl cord

Clamp

Nut (M6)

fig.3

Pan head screw

Speed control wire

61

17.6N・m

(13.0ft・lbf)

No.

Size

Socket Head Bolt

M8X30

Apply Loctite

#221

Tightening

torque

Remarks

29

53.9N・m

(39.8ft・lbf)

No.

Size

Flange Nut M10

Tightening

torque

Remarks

28

22.5N・m

(16.6ft・lbf)

No.

Size

Flange Bolt M10X40

Flange Bolt M10X30

MTX-60

MTX-70

Tightening

torque

Remarks

29

19.6N・m

(14.5ft・lbf)

No.

Size

Flange Bolt M8X30

Tightening

torque

Remarks

65

19.6N・m

(14.5ft・lbf)

19.6N・m

(14.5ft・lbf)

No.

Size

Nut M8

Apply Loctite

#221

72

Socket Head Bolt

M8X20

Tightening

torque

Remarks

27

53.9N・m

(39.8ft・lbf)

53.9N・m

(39.8ft・lbf)

No.

Size

Flange Nut M10

28 Bolt M10X70

Tightening

torque

Remarks

Socket Head Bolt

M8X20, PW

63

19.6N・m

(14.5ft・lbf)

No.

Size

Apply Loctite

#221

Tightening

torque

Remarks

8

Unscrew a bolt (25) which is fixing the clutch.
Then, assemble the clutch puller B (P/N:9839

-10020) to the clutch by tightening 4 pcs pan
head screws, and tighten the center bolt B to
the crank shaft of engine. (fig.4)

In addition, assemble the clutch puller A
(P/N:9810-10400) to the clutch puller B by
tightening 2 pcs bolts A, and tighten the
center bolt A. (fig.5)

Remove the clutch by shocking the top end of
center bolt A with plastic hammer. (fig.6)
If it doesn’t remove, shock it after tightening
the center bolt A again.

Disassembling the engine is completed
above.

H.

I.

J.

Reassemble with the reversed procedure of
disassembly with attention to the following
terms.
Replace the clutch with new one, if it is dam­aged.

Degrease the engine shaft when assembling
the clutch.

Tighten a bolt which is fixing the clutch by
fixing the clutch with the clutch mounter
(P/N:9830-10060). (fig.7)

Adjust the operating speed of engine as table

1.

The well nut (53, 59) is tightened by com­pressing the rubber of it when is tightening
the bolt. (fig.8)

A.

B.

C.

D.

E.

(2) Reassembly

Bolt M8X2525

32.4N・m

(23.9ft・lbf)

No.

Size

Apply Loctite

#221

Tightening

torque

Remarks

fig.6

fig.8

Bolt “A”

fig.5

(Clutch puller “A”)

Special tool

Center bolt “A”

fig.7

fig.4

Center bolt “B”

(Clutch puller “B”)

Special tool

9

Piston pin

fig.10

A.

B.

Drain oil from drain plug (17).

Remove the guide cylinder (20) by removing
a clamp (25) for the upper bellows (25) after
removing the nut (28), bolt (27) and pin (29),
which fixing it.
(There is no pin (29) on the MTX-60.)

Remove the bellows (23) by removing a
clamp (25) for the lower bellows after
removing the nut (28), bolt (27) and pin (29),
which fixing it.
(There is no pin (29) on the MTX-60.)

Remove the foot assembly by unscrewing 4
pcs M12 nylon nuts. (fig.11)

Remove the foot plate from the protection
sleeve (51) as per following procedure.
i) In case of MTX-60

1) Unscrew 2 pcs bolts which marked foot
plate. (fig.12)
Assemble the spring cylinder remover(P/N:
9830-10040) there.Then, unscrew 6 pcs
remaining bolts after tightening the center
bolt of the spring cylinder remover.

C.

D.

E.

F.

G.

Unscrew 4 pcs bolts (22) which is fixing the
crankcase and the guide cylinder.

Lift the crankcase and separate the connect­ing rod and the piston rod by removing the
piston pin (1). (fig.10)

38

78.4N・m

(57.8ft・lbf)

No.

Size

Nylon Nut M12

Tightening

torque

Remarks

22

53.9N・m

(39.8ft・lbf)

No.

Size

Bolt M10X35, SW

Tightening

torque

Remarks

Apply Loctite

#221

17

39.2N・m

(28.9ft・lbf)

39.2N・m

(28.9ft・lbf)

No.

Size

Oil Drain Plug

30

Oil Fill Plug

Tightening

torque

Remarks

27

12.7N・m

(9.4ft・lbf)

12.7N・m

(9.4ft・lbf)

No.

Size

Bolt M8X40

28 Nut M8

Tightening

torque

Remarks

27

12.7N・m

(9.4ft・lbf)

12.7N・m

(9.4ft・lbf)

No.

Size

Bolt M8X40

28 Nut M8

Tightening

torque

Remarks

24.5N・m

(18.1ft・lbf)

15

68.6N・m

(50.6ft・lbf)

No.

Size

Socket Head Bolt

M10X20

Socket Head Bolt

M8X40

16

Tightening

torque

Remarks

Apply Loctite

#221

Apply Loctite

#221

Nylon nut (M12)

fig.11

8.2 Disassembly and reassembly the guide
cylinder and the spring cylinder.

fig.9

17

18

8

9

13

11

(Only MTX-60)

(MTX­ 70,80,90)

15

16

14

4

5

10

6

7

9

12

3

1

2

21

32

20

22

23

24

25

25

27

28

29

51

27

28

24

53

52

30

31

26

26

29

35

363739

38

(1) Disassembly

10

2) Loosening the center bolt of the spring cyl
inder remover slowly will remove the foot
plate (13). (fig.13)
Remove the spring cylinder remover when
decreasing pressure of main springs (9).
Then, remove the lower main springs (9)
and lower stopper (8).

Load the piston rod holder (P/N:9839-10030)
to the vice, and put the spring cylinder as­sembly which removed the foot plate upside
down to it. Then, remove the bolt (5), SW and
PW, which fixing the piston end (4). (fig.14)

Assemble the piston end remover (P/N:9839-

10010) to the piston end(4), and tightening
the center bolt of it. (fig.15)

H.

I.

i) In case of MTX-70 / 80 / 90

1) Unscrew 2 pcs bolts which marked foot
plate. (fig.12)
Assemble the spring cylinder remover(P/N:
9830-10040) there.Then, unscrew 6 pcs
remaining bolts after tightening the center
bolt of the spring cylinder remover.

fig.15

(Piston end
remover)

Special tool

Center bolt

5

117.6N・m

(83.7ft・lbf)

No.

Size

Bolt M12X30

(Fine Pitch Thread)

Tightening

torque

Remarks

Apply Loctite

#221

fig.13

(Spring cylinder remover)

Special tool

Center
bolt

fig.14

(Piston rod holder)

Special tool

11

Rear (Engine side)

Front (Front cover side)

Mark

Backside of "Foot plate"

MTX-60

Socket head bolt M10 x 20(15)

Socket head bolt M 8 x 40(16)

Special tool
wearing point

Rear (Engine side)

Front (Front cover side)

Mark

Backside of "Foot plate"

MTX-70 / 80 / 90

Socket head bolt M10 x 20(15)

Socket head bolt M10 x 40(16)

Special tool
wearing point

fig.12

15

68.6N・m

(50.6ft・lbf)

53.9N・m

(39.8ft・lbf)

No.

Size

Socket Head Bolt

M10X20

Socket Head Bolt

M10X40

16

Tightening

torque

Remarks

Apply Loctite

#221

Apply Loctite

#221

J.

K.

A.

B.

C.

D.

E.

F.

G.

Remove the engine assembly as per 8-1.

Separate the crankcase and the guide cylin­der as per 8-2.

Remove the handle assembly by unscrewing
4 pcs bolts (4) which fixing it.

Remove the air cleaner assembly (33) by un­screwing 2 pcs bolts (40) and 2 pcs bolts
(39), which is fixing it. (fig.19)

A.

B.

C.

D.

Remove the piston end (4) by shocking the
top end of center bolt with the

plastic

hammer.

(fig.16)
If it doesn’t remove, shock it after tightening
the center bolt again.

Remove the protection sleeve (51) from the
spring cylinder (12). (fig.17)

Disassembling the guide cylinder and
spring cylinder are completed above.

Reassemble with the reversed procedure of
disassembly with attention to the following
terms.

Replace the disassembled O-ring with new
one.

Replace the main spring (9) as a set with
upper and lower when replacing it

Replace the bellows (23) with new one, if it is
damaged.

The bellows (23) is easy to install by applying
grease to inner wall of its opening.

Be careful not to pinch and to twist the O-ring
when assembling the spring cylinder (12) and
guide cylinder (20).

Apply molybdenum grease to inner sliding
parts of spring cylinder (12), guide cylinder
(20) and main spring (9) before assembling
them.

Assemble the foot plate (13) to the spring cyl­inder (12) with the spring cylinder remover
(P/N:9830-10040) after fitting position of the
oil drain plug (17) of foot plate and the oil fill

39

24.5N・m

(18.1ft・lbf)

24.5N・m

(18.1ft・lbf)

No.

Size

Bolt M8X55

Bolt M8X15

40

Tightening

torque

Remarks

8.3 Disassembly and reassembly the
crankcase.

(1) Disassembly

1

4

31

33

42

40

39

47

47

2

21

22

3

5

6

7

9

10

11

12

13

14

15

17

16

19

20

21

106

101

44

32

23

fig.18

fig.19

12

Protection sleeve

Spring cylinder

fig.17

fig.16

Center bolt

(2) Reassembly

E.

F.

G.

H.

Remove the connecting rod (14) from crank
gear (101) with the pulley puller after remov­ing the stop ring (17).

Remove the bearing (9) from the connecting
rod with the press after removing the stop
ring (16). (fig.24)

Remove the pinion drum (4) from the crank
case (1) with the press after removing the
stop ring (7). (fig.25)

Disassembling the crank case is com­pleted above.

Reassemble with the reversed procedure of
disassembly with attention to the following
terms.

Be careful not to pinch fingers between the
crank case and the front cover.

Apply molybdenum grease to contact surface
of oil seal, O-ring, tooth face of pinion gear
and crank gear.

I.

J.

K.

A.

B.

Remove the shock absorber bracket (31) by
unscrewing 4 pcs bolts (32) which fixing it.
(fig.20)

Remove the front cover (106) by shocking it
with the plastic hammer after unscrewing 8
pcs bolts (21) which fixing it. (fig.21)

Remove the stop ring (11) which fixing bear­ing (10) through the hole of crank gear (101)
with the snap ring plier. (fig.22)

Remove the crank gear by tightening 2 pcs
M8x50 full threaded bolts (P/N:0091-10044)
to threaded holes which installed in the crank
gear evenly, after fitting position of the top
end of bolts and the ribs of front cover which
had three o’clock and nine o’clock positions.
(fig.23)

(2) Reassembly

1

4

3

6

7

5

fig.25

fig.22

Please match a position
of this lib with a head of
a bolt.

fig.23

9

14

17

16

101

fig.24

13

32

53.9N・m

(39.8ft・lbf)

No.

Size

Bolt M10X30,SW

Tightening

torque

Remarks

Apply Loctite

#221

21

No.

Size

Socket Head Bolt

M8X25

Tightening

torque

Remarks

Apply Loctite

#242

24.5N・m

(18.1ft・lbf)

fig.21

fig.20

A.

B.

C.

A

B.

Remove the slider (9) and the inner wire from
there.

Remove the outer wire by unscrewing 2 pcs
nuts (7) after removing the wire cap (6).

Reassemble with the reversed procedure of
disassembly.

In case of removing the fuel cock (3), move to
high speed position of the lever (2) ready.
(fig.29)

C.

D.

A.

Remove the fuel tank (10) from the handle by
unscrewing 3 pcs bolts (11) after disconnect­ing the fuel hose (19).

Unscrew 2 pcs tapping screws (22) which
fixing the meter finisher from the underside of
the fuel tank, and remove the hour & tachom­eter and the meter finisher at the same time
because they are tightening at the same time.

In case of replacing the fuel filter (14) which
installed in the fuel tank, remove the fuel filter
holder (16) by unscrewing 3 pcs nuts (17)
which is fixing it.

Reassemble with the reversed procedure of
disassembly with attention to the following
terms.

Replace the damaged fuel hoses (19, 103,

104) with new one.

Be careful not too tightening the tapping
screws (22) which is fixing the hour &
tachometer and the meter finisher because
the threaded holes of the meter finisher made
by plastic is broken by over tightening torque.

(1) Disassembly

5-2 Disassembly and reassembly
the fuel cock

(1) Disassembly

(2) Reassembly

(2) Reassembly

fig.28

In case of removing the throttle wire (5),
move to idling position of the lever (2) ready.
(fig.28)

Remove the end cap (11) and unscrew a bolt
(10) and 2 pcs nuts (8).

A.

B.

8.5 Disassembly and reassembly the
combination lever

(1) Disassembly

5-1 Disassembly and reassembly
the throttle wire

fig.27

1

2

3

4

5

6

7

8

8

9

10

11

121314

15

16

17

18

19

20

14

8.4 Disassembly and reassembly the
handle.

3

41

41

101

101

101

101

7

6

5

43

43

42

42

A

9

54
51

10

22

56

14
15

18

16

17

53

A

11

55

4

52

102

103

57

104

fig.26

20

19

20

Never disassemble the stop switch (4).

CAUTION

！

B.

A.

B.

C.

A.

B.

Reassemble with the reversed procedure of
disassembly with attention to the following
terms.

Assemble the stop switch after fitting the po­sition of groove between the fuel cock and
the stop switch.

Apply grease for combination lever (P/N:9800

-10420) to the O-ring (19), the groove and the
gear of the stop switch.

In case of the threaded hole was broken by
too over screwing the tapping screw M4X12
(18), it is available by M4X16.

In case of the threaded hole was broken by
too over screwing the tapping screw M4X30
(19), it is available by M4X34.

Remove the lever (2) by unscrewing a bolt
(12) after unscrewing a bolt (14). (fig.32)

Reassemble with the reversed procedure of
disassembly with attention to the following
terms.

Be careful the way of dick springs as per
fig.33 when assembling the lever.

A.

B.

C.

D.

A.

Remove the fuel cock (3) by unscrewing 2
pcs tapping screw (16). (fig.30)

Reassemble with the reversed procedure of
disassembly with attention to the following
terms.

Assemble the fuel cock after fitting the posi­tion of groove between the fuel cock and the
stop switch.

Apply grease for combination lever (P/N:9800

-10420) to the O-ring (17) and the groove of
the fuel cock.

In case of the threaded hole was broken by
too over screwing the tapping screw M4X12
(16), it is available by M14X16.

In case of removing the stop switch (4), move
to high speed position of the lever (2) ready.
(fig.29)

Remove the stop switch (4) by unscrewing 2
pcs tapping screws (19) and a tapping screw
(18). (fig.31)

(2) Reassembly

(1) Disassembly

(1) Reassemble

5-4 Disassembly and reassembly
the lever

(1) Disassembly

5-3 Disassembly and reassembly
the stop switch

(2) Reassembly

fig.32

212131415

fig.33

Lever

Dick springs

Socket head bolt
M8×35

fig.31

19184

18

0.78N・m

(0.58ft・lbf)

0.78N・m

(0.58ft・lbf)

No.

Size

Tapping Screw

M4X30

Tapping Screw

M4X12

19

Tightening

torque

Remarks

15

16

0.78N・m

(0.58ft・lbf)

No.

Size

Tapping Screw

M4X12

Tightening

torque

Remarks

16173

fig.30

fig.29

9. PERIODIC CHECKS AND ADJUSTMENTS

Table 3

9.1 Table of scheduled checks

9.2 Periodic checks and adjustments

How often?

Daily
(before starting operation)

After first 20 hours
Every 50 hours

Every 200 hours

Every 200 to 300 hours

Every 2 years

Place to check

Appearance
Air cleaner
Bolts, nuts
Handle
Rubber damper
Engine oil
Lubrication oil in
the main body
Fuel tank
Fuel system
Engine oil
Spark plug
Engine oil
Lubrication oil in
the main body
Pre-air cleaner
(primary element)
Fuel hose

Item to check
Flaws, deformity, dirt
Dirt, flaws, deformation
Loose or missing parts
Flaws, deformity, cracks, damage
Wear, deformity, cracks, damage
Dirt, oil level
Dirt, oil level

Leaks, fuel level, dirt
Leaks, wear, looseness
Replace once, after the first 20 hours
Clean, adjust gap
Replace
Replace

Cleaning

Replace

Oil etc.

Engine oil
Engine oil

Gasoline

Engine oil

Engine oil
Engine oil

Lamp kerosene

Daily maintenance

Carefully wipe off any mud

, dirt or oil from each
component.
If oil leaks, retighten the joints and check
again.

Maintenance after every 50 hours of operation

Remove the fuel filter cup and clean the inside
thoroughly. (fig.34)
Remove the spark plug and clean it.

Then

adjust the gap to 0.6 to 0.7 mm.

Replacing the lubrication oil

Remove the drain plug on the lower part of the
machine body and drain the oil inside. Then
add the specified amount of new oil.(fig.35)

(1)

(2)

(3)

Oil gauge

Drain plug

fig.35

Fuel filter

fig.34

16

Cleaning the air cleaner

Remove the upper air cleaner cover on the
main body. Loosen and remove the 2 Phillips
screws that hold the cover on the air cleaner
assembly.

Primary element (clean every 80 to 100 hours)

If the primary element is dirty, wash it with
gasoline or lamp kerosene. Then, dip it in
engine oil SAE10W-30 and wring it out. (Wring
the element so that 25 to 30 cc of engine oil
remains in the element.) (fig.36)

Secondary element (clean every 100 to 150
hours)

When the secondary element (under the
primary element) becomes dirty, wash it with
neutral detergent solution and dry it well. Then
reuse it. (fig.37,38)

Be sure to check the fuel line for damaged
or looseness.

Replace the fuel line every 2 years, even if it
does not show any abnormality.

Cleaning the machine body

If you want to clean the machine body using
high-pressure steam, do not spray water
directly into the air cleaner, carburetor, muffler,
or top of the fuel tank. Otherwise engine
problems may occur.

Secondary element

fig.37

fig.38

Primary element

fig.36

(4)

A.

B.

(5)

(6)

17

10. TROUBLESHOOTING

Engine

1.Won't start

Fuel is present
but the spark plug
is not sparking.

Fuel and spark
are both present.

Fuel is not being
supplied to the
carburetor.

Electricity is being
supplied to the
high voltage
cable.

Electricity is not
being supplied to
the high voltage
cable
Compression is
good

Compression is
low

The gap in the spark plug tip is clogged.
Carbon is stuck on the spark plug
The spark plug has a short circuit due to faulty
insulation.
The gap in the spark plug is the wrong size.
The stop button switch has a short circuit.
The ignition coil is broken.

The muffler is clogged with carbon.
The wrong fuel was used.
The air cleaner is clogged.
The fuel is contaminated with water or dirt.
The cylinder head gasket is blown or the head is not
correctly tightened.
The piston rings don't fit well.
The cylinder is worn.
The spark plug is not seated tightly.
The valve seat is damaged.

No fuel in the fuel tank.
Faulty fuel cock operation.
The fuel filter is clogged.
The air hole in the cap on the fuel tank is clogged.
Air is trapped in the fuel line.

2.Faulty operation

Too little
power

Engine
overheats

Smoke
comes from
the muffler

Good compression
and no misfiring

Good compression
but misfires

Black smoke
Blue
smoke

White smoke

Dirt in the air cleaner.
Air trapped in the fuel line.
Carbon has accumulated in the cylinder.

Faulty ignition coil.
Dirt on the spark plug.
Ignition coil shorts sometimes.

Choke lever wasn't returned to the open position.
Blended fuel (for 2-cycle engines) was used.
Too much oil.
Engine oil leaked into the air cleaner when the
machine was laid down on the wrong side.
Worn piston rings.
The piston rings don't fit well.
Moisture in the gasoline.
The air cleaner is wet.

Low compression (See ”Compression in low” above

Excessive accumulation of carbon in the combustion chamber.
Clog exhaust port or muffler.
Faulty spark plug.

Good
compression

Compression
is low

(In the winter, the machine may emit white smoke for a while when first started in the morning.
This is not abnormal.)

Faulty governor adjustment.
Faulty governor spring.
Faulty fuel flow.
Air being sucked into the fuel line.

Engine speed fluctuates

18

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Multiquip Inc. ◦ MTX Series Rammers ◦ Manual No. MTX2015SM