Matco Tools MT1734 Instruction Manual

MT1734 1 Rev. 12/05/03

MT1734

3/8" Butterfly

Impact Wrench

Some dust created by power sanding, sawing, grinding, drilling, and other construction
activities contains chemicals known to cause cancer, birth defects or other reproductive
harm. Some examples of these chemicals are:

• lead from lead-based paints,

• crystalline silica from bricks and cement and other masonry products, and

• 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: work in a well ventilated area, and
work with approved safety equipment, such as those dust masks that are specially
designed to filter out microscopic particles.

MT1734

Max. Free Speed . . . . . . . . . . . . . . . . . . . . . . . . 11,500 RPM

Working Torque . . . . . . . . . . . . . . . . . . . . . . . . .10-60 Ft. Lbs.

Max. Torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75 Ft. Lbs.

Air Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/4" NPT

Air Hose Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/8" ID

Recommended Air Pressure . . . . . . . . . . . . . . . . . . . . . 90 PSIG

Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.94"

Net Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 LBS.

Air Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . .2.22 CFM

SPECIFICATIONS

• Operating Instructions • Warning Information

• Parts Breakdown

ALWAYS READ
INSTRUCTIONS
BEFORE USING
POWER TOOLS

ALWAYS WEAR
SAFETY GOGGLES

WEAR HEARING
PROTECTION

AVOID
PROLONGED
EXPOSURE TO
VIBRATION

MT1734 2 Rev. 12/05/03

MT1734 3/8" Butterfly Impact Wrench

THIS INSTRUCTION MANUAL CONTAINS
IMPORTANT SAFETY INFORMATION.

READ THIS INSTRUCTION MANUAL CAREFULLY
AND UNDERSTAND ALL INFORMATION
BEFORE OPERATING THIS TOOL.

• Always operate, inspect and maintain this tool in
accordance with American National Standards
Institute Safety Code of Portable Air Tools (ANSI
B186.1) and any other applicable safety codes
and regulations.

• For safety, top performance and maximum durability
of parts, operate this tool at 90 psig 6.2 bar max
air pressure with 3/8" diameter air supply hose.

• Always wear impact-resistant eye and face
protection when operating or performing
maintenance on this tool.

• Always wear hearing protection when using this
tool. High sound levels can cause permanent hearing
loss. Use hearing protection as recommended by
your employer or OSHA regulation.

• Keep the tool in efficient operating condition.

• Operators and maintenance personnel must be
physically able to handle the bulk, weight and
power of this tool.

• Air powered tools can vibrate in use. Vibration,
repetitive motions or uncomfortable positions over
extended periods of time may be harmful to your
hands and arms. Discontinue use of tool if discomfort,
tingling feeling or pain occurs. Seek medical advice
before resuming use.

• Air under pressure can cause severe injury. Never
direct air at yourself or others. Always turn off the
air supply, drain hose of air pressure and detach tool
from air supply before installing, removing or
adjusting any accessory on this tool, or before
performing any maintenance on this tool. Failure to

do so could result in injury. Whip hoses can cause
serious injury. Always check for damaged, frayed
or loose hoses and fittings, and replace immediately.
Do not use quick detach couplings at tool. See
instructions for correct set-up.

• Place the tool on the work before starting the tool.

• Slipping, tripping and/or falling while operating air
tools can be a major cause of serious injury or
death. Be aware of excess hose left on the walking
or work surface.

• Keep body working stance balanced and firm. Do
not overreach when operating the tool.

• Anticipate and be alert for sudden changes in motion
during start up and operation of any power tool.

• Do not carry tool by the hose. Protect the hose from
sharp objects and heat.

• Tool shaft may continue to rotate briefly after throttle
is released. Avoid direct contact with accessories
during and after use. Gloves will reduce the risk of
cuts or burns.

•Keep away from rotating end of tool. Do not wear
jewelry or loose clothing. Secure long hair. Scalping
can occur if hair is not kept away from tool and
accessories. Choking can occur if neckwear is not
kept away from tool and accessories.

• Impact wrenches are not torque control devices
Fasteners with specific torque requirements must be
checked with suitable torque measuring devices
after installation with an impact wrench.

• Use only impact wrench sockets and accessories on
this tool. Do not use hand

• Do not lubricate tools with flammable or volatile
liquids such as kerosene, diesel or jet fuel.

• Do not force tool beyond its rated capacity.

• Do not remove any labels. Replace damaged labels.

FAILURE TO OBSERVE THESE WARNINGS COULD RESULT IN INJURY

OPERATION

The air regulator knob can be used as an air throttle, if there are
no other means of regulating air. Turn the air regulator knob all the
way to position 4 for maximum power.

The air regulator can be used to adjust torque to the approximate
tightness of a known fastener.To set the tool to desired torque, select
a nut or screw of known tightness of the same size, thread pitch
and thread condition as those on the job. Turn air regulator to low
position, apply wrench to nut and gradually increase power (turn
regulator to admit more air) until nut moves slightly in the direction
it was originally set. The tool is now set to duplicate that tightness ­note regulator setting for future use. When tightening nuts not
requiring critical torque values, run nut up flush and then tighten an
additional one-quarter to one-half turn (slight additional turning is
necessary if gaskets are being clamped). For additional power
needed on disassembly work, turn regulator to its fully open
position. This impact wrench is rated at 3/8" USS bolt size. Rating
must be down graded for spring U bolts, tie bolts, long cap screws,

double depth nuts, badly rusted conditions and spring fasteners as
they absorb much of the impact power. When possible, clamp or
wedge the bolt to prevent springback.

Soak rusted nuts in penetrating oil and break rust seal before
removing with impact wrench. If nut does not start to move in three
to five seconds use a larger size impact wrench. Do not use impact
wrench beyond rated capacity as this will drastically reduce tool
life.

The reversing valve is used to change the rotation of the tool. When
the valve is out, the tool is in a forward or right hand rotation.
When the valve is pushed in, the rotation is reverse or left hand.

NOTE: Actual torque on a fastener is directly related to joint
hardness, tool speed, condition of socket and the time the tool is
allowed to impact.

Use the simplest possible tool-to-socket hook up. Every connection
absorbs energy and reduces power.

MT1734 3 Rev. 12/05/03

MT1734 3/8" Butterfly Impact Wrench

WARRANTY

Matco warrants its air tools for a period of 1 year to the consumer.
We will repair any MT Series air tool covered under this warranty
which proves to be defective in material or workmanship during the
warranty period. In order to have your tool repaired, return the tool
to either of the Matco Authorized Warranty Centers listed below,
freight prepaid. Please include a copy of your proof of purchase
and a brief description of the problem. The tool will be inspected
and if any part or parts are found to be defective in material or
workmanship, the tool will be repaired free of charge and returned
to you freight prepaid.

This warranty gives you specific rights. You may also have other
rights which vary from state to state.

The foregoing obligation is Matco’s sole liability under this or any
implied warranty and under no circumstances shall Matco be liable
for any incidental or consequential damages.

Note: Some states do not allow the exclusion or limitation of
incidental or consequential damages so the above limitation or
exclusion may not apply to you.

MATCO AIR COMMAND
Tool Repair SV
1330 Commerce Dr.
Stow, OH 44224
[phone]

DISCOUNT TOOL REPAIR
3433 Losee Rd. #1
North Las Vegas, NV 89030
[phone]

AIR SUPPLY

Tools of this class operate on a wide range of air pressures. It is
recommended that air pressure of these tools measures 90 PSI at
the tool while running free. Higher pressure and unclean air will
shorten tool life because of faster wear and may create a
hazardous condition.

Water in the air line will cause damage to the tool. Drain the air
tank daily. Clean the air inlet filter screen on at least a weekly
schedule. The recommended hook-up procedure can be viewed
in Figure 1.

The air inlet (Figure 2), used for connecting air supply, has standard
1/4" NPT American Thread.

Line pressure should be increased to compensate for unusually
long air hoses (over 25 feet). Minimum hose diameter should be
3/8" I.D. and fittings should have the same inside dimensions.

TROUBLESHOOTING

Other factors outside the tool may cause loss of power or erratic
action. Reduced compressor output, excessive drain on the air line,
moisture or restrictions in air pipes or the use of hose connections
of improper size or poor conditions may reduce air supply. If
outside conditions are in order, and the tool still performs
erratically, disconnect tool from hose and take tool to your nearest
Matco authorized service center.

LUBRICATION & MAINTENANCE

Lubricate the tool daily with a good grade of air tool oil. If no
air line oiler is used, run a teaspoon of oil through the tool. The oil
can be squirted into the tool air inlet Figure 2, or into the hose at
the nearest connection to the air supply, then run the tool. A rust
inhibitive oil is acceptable for air tools.

FIG. 1 FIG. 2

AIR

INLET

AIR REGULATOR

FEATURES

• Butterfly forward/reverse throttle makes one hand operation easy

• 360° swivel air inlet for maximum convenience and versatility

• Built in air regulator on swivel inlet

• Durable dog clutch for trouble-free service

• Tapered front nose for easy access to limited clearance areas

Nipple

MT1734 4 Rev. 12/05/03

MT1734 3/8" Butterfly Impact Wrench

REF. NO. PART NO. DESCRIPTION QTY.

101 RS1734101 Oil Seal 1
102 RS1734102 Housing 1
103 RS1734103 Hex Socket Head Screw 1
104 RS1734104 Latch Spring Bushing 1
201 RS1734201 Socket Retainer 1
202 RS1734202 O-Ring 1
203 RS1734203 Anvil 1
204 RS1734204 Hammer Cage Pin 1
205 RS1734205 Hammer Cage 1
206 RS1734206 Hammer 1
207 RS1734207 Hammer Cam 1
208 RS1734208 C-Ring 1
301 RS1734301 Bearing 1
302 RS1734302 Sealing 1
303 RS1734303 Magazine 1
304 RS1734304 O-Ring 1
305 RS1734305 Rotor 1
306 RS1734306 Blades 6
307 RS1734307 Cylinder 1
308 RS1734308 Spring Pin 1
309 RS1734309 Rear End Plate 1

REF. NO. PART NO. DESCRIPTION QTY.

310 RS21114 Bearing 1
311 RS1734311 Spring Pin 1
401 RS1734401 Trigger 1
402 RS1734402 Gasket 1
403 RS1734403 Rear Cover 1
404 RS1734404 Hex Socket Head Bolt 4
405 RS1734405 O-Ring 2
406 RS1734406 Valve Stem 2
407 RS1734407 Valve Seal 2
408 RS1734408 Spring 2
409 RS1734409 E-Ring 1
410 RS1734410 O-Ring 1
411 RS1734411 O-Ring 1
412 RS1734412 Regulator Body 1
413 RS1734413 Spring Pin 1
414 RS1734414 O-Ring 1
415 RS1734415 Regulator 1
416 RS1734416 Ball 1
417 RS1734417 Spring 1
418 RS1734418 Hex Socket Head Screw 1

TUNE-UP KIT

MT1734TK includes Ref. Nos. 101, 201, 202, 302,
304, 306 (6), 402, 405 (2), 407 (2), 410, 411, 414