MT638 3 9/9/15
aIr suPPly
Tools operate on a wide range of air pressures. It is recommended
that air pressure measures 90 psig at the tool with the trigger fully
depressed and no load applied to the tool. Higher pressure (over
90 psig; 6.2 bar) raises performance beyond the rated capacity of
the tool, which will shorten tool life and could cause injury.
Always use clean, dry air. Dust, corrosive fumes and/or water in
the air line will cause damage to the tool. Drain the water from
air lines and compressor prior to running tool. Clean the air inlet
filter screen weekly. The recommended hookup procedure can
be viewed in the Figure 1.
The air inlet used for connecting air supply has standard 1/4" NPT.
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 and
be tightly secured.
Always turn off the air supply, drain hose of air pressure
and detach tool from air supply before installing, removing or
adjusting any part or accessory on this tool, or before performing
any maintenance on this tool.
ensure an accessible emergency shut off valve has
been installed in the air supply line and make others
aware of its location.
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. Grit or
gum deposits in the tool may cut power and may be corrected
by cleaning the air strainer and flushing out the tool with gum
solvent oil or an equal mixture of SAE #10 and kerosene. If outside
conditions are in order, disconnect tool from hose and take tool to your
nearest authorized service center.
luBrIcaTIOn and MaInTenance
Lubricate the air motor daily with high quality air tool oil. If no air
line oiler is used, run 1/2 oz. of oil through the tool. The oil can
be squirted into the tool air inlet 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.
wArning:
After an air tool has been lubricated, oil will discharge
through the exhaust port during the first few seconds of operation.
The exhaust port must be covered with a towel before applying
air pressure to prevent serious injury.
fIg. 1
fIg. 2
aIr InleT
TrIgger
feaTures
•
designed to perform.
Precision machined cylinder and rotor produce 170 RPM and 50 ft. lbs. of working torque.
•
ultimate control.
Variable speed throttle easily controls speed and power output.
•
lightweight design.
Aluminum housing with front exhaust motor design.
MT638 3/8" AIR RATCHET
Drain Daily
Regulator
Oiler
Quick Coupler
Leader
Hose
Nipple
Do Not Install
Quick Coupling
Here
Nipple
Filter
Air Supply
Whip Hose
fOrWard/reVerse
OPeraTIOn
The MT638 3/8" ratchet is designed to fasten and unfasten threaded
fasteners while operating under recommended conditions. Note
the directional setting of the reversing button before depressing
the throttle. Ensure body stance to be in excellent balance and
have full control of the tool before use. Be fully alert as sudden
reaction torques and directional changes may unexpectedly
occur. Be aware that air ratchets are not torque wrenches or
pry bars. Joints and fasteners requiring a specific torque must
be checked with a torque wrench as the final step. Using the air
ratchet while the power is in the "off" position, to tighten or break-
free fasteners, can irreversibly damage its internal mechanism
and will void any remaining warranty.
Always turn off the air supply, drain hose of air pressure
and detach tool from air supply before installing, removing or
adjusting any part or accessory on this tool, or before performing
any maintenance on this tool.
wArning: use only impact sockets and accessories on this
tool. do not use hand sockets and accessories.
