Universal Air Tools UT150 User Manual

Operator Instructions

Includes - Foreseen Use, Work Stations, Putting Into Service, Operating,
Dismantling, Assembly and Safety Rules

Important

Read these instructions carefully before installing, operating,
servicing or repairing this tool. Keep these instructions in a safe
accessible place.

Manufacturer/Supplier Product Type

Universal Air Tool Company Limited
Unit 8
Lane End Industrial Park
High Wycombe
Bucks

1½" Square Inside Lever
Grip Impact Wrench

Model No/Nos Serial No

UT150 (HP150)

HP14 3BY

Tel No Fax No[phone] [phone]

RPM

3,000

Cycles Per Min

Product Nett Weight

34.1

15.5

lbs
Kg

Recommended Use Of

Balancer Or Support

Yes

Air Pressure
Recommended Working
Recommended Minimum
Maximum

6.3
n/a

7.0

bar
bar
bar

90

n/a

100

Personal Safety Equipment

Use - Safety Glasses

Yes

Use - Safety Gloves
Use - Safety Boots
Use - Breathing Masks
Use - Ear Protectors

Yes

Foreseen Use Of Tool

The impact wrench is designed for the tightening and loosening
of threaded fasteners within the range as specified by the
manufacturer. It should only be used in conjunction with suitable
impact type 1½" square female drive nut running sockets. Only
use sockets which are of the impact type.
It is allowed to use suitable extension bars, universal joints and
socket adaptors between the square output drive of the impact
wrench and the square female drive of the socket.
Do not use the tool for any other purpose than that specified
without consulting the manufacturer or the manufacturer's
authorised supplier. To do so may be dangerous.
Never use an impact wrench as a hammer to dislodge or
straighten cross threaded fasteners. Never attempt to modify the
tool for other uses and never modify the tool for even its
recommended use as a nutrunner.

Work Stations

The tool should only be used as a handheld hand operated tool.
It is always recommended that the tool is
used when standing on the solid floor. It can
be in other positions but before any such
use, the operator must be in a secure
position having a firm grip and footing and
be aware that when loosening fasteners the
tool can move quite quickly away from the
fastener being undone. An allowance must
always be made for this rearward move­ment so as to avoid the possibility of
hand/arm/body entrapment.

Recommended Hose Bore

Size - Minimum

Ins M/M Ft M

1/2 13 30 10

Recommended Max.

Hose Length

Noise Level Sound Pressure Level 98.7 dB(A)

PSI

Test Method Tested in accordance with Pneurop

PSI

test code PN8NTC1 and ISO Standard 3744

Sound Power Level 110.4 dB(A)

PSI

Vibration Level

9.7

Metres / Sec²

Test Method Tested in accordance with ISO

standard 8662 Parts 1 & 7

Putting Into Service

Air Supply

Use a clean lubricated air supply that will give a measured air
pressure at the tool of 90 p.s.i./6.3 bar when the tool is running
with the trigger fully depressed and the air regulator in its
maximum opening flow position. Use recommended hose size
and length. It is recommended that the tool is connected to the
air supply as shown in figure 1. Do not connect a quick connect
coupling directly to the tool but use a whip or leader hose of say
approximately 12 inches length. Do not connect the tool to the
air line system without incorporating an easy to reach and
operate air shut off valve. The air supply should be lubricated. It
is strongly recommended that an air filter, regulator, lubricator
(FRL) is used as shown in Figure 1 as this will supply clean,
lubricated air at the correct pressure to the tool. Details of such
equipment can be obtained from your supplier. If such
equipment is not used then the tool should be lubricated by
shutting off the air supply to the tool, depressurising the line by
pressing the trigger on the tool. Disconnect the air line and pour

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into the inlet bushing 2 teaspoonfuls (10ml) of a suitable
pneumatic motor lubricating oil preferably incorporating a rust
inhibitor. Reconnect tool to air supply and run tool slowly for a
few seconds to allow air to circulate the oil. If tool is used
frequently lubricate on daily basis and if tool starts to slow or lose
power.
It is recommended that the air pressure at the tool whilst the tool
is running is 90 p.s.i./6.3 bar. The tool can run at lower and
higher pressures with the maximum permitted working air
pressure of 100 p.s.i./7.0 bar. For a lower air pressure the tool
will give a lower output for a given setting of the air regulator set
for 90 psi operation and an increased output for higher
pressures. Hence it is possible that changes in supply pressure
can give situations where the fastener is under or over tightened.
For changes in pressure, the regulator position and application
should be reassessed.

Operating

The output of the impact wrench in prime working condition is
governed by mainly three factors
a) the input air pressure
b) the time the impact wrench is operated on the joint. Normal
time for joints of average tension requirement 3 to 5 seconds
c) the setting of the air regulator for a given joint at a given
pressure operated for a given time.

The air regulator item (12) can be used to regulate the output of
the impact wrench if no other control means is available. It is
strongly recommended that an external pressure regulator
ideally as part of a filter/regulator/lubricator (FRL) is used to
control air inlet pressure so that
the pressure can be set to help
control the tension required to
be applied to the threaded
fastener joint.
There is no consistent reliable
torque adjustment on an
impact wrench of this type.
However, the air regulator can
be used to adjust torque to the
approximate tightness of a
known threaded joint. To set
the tool to the 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 a 2" 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.
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.

Dismantling & Assembly Instructions

Disconnect tool from air supply.
Clamp handle of impact wrench in a vice with square drive
upwards. Unscrew four cap screw (48). Take out impact housing
C.P. (45). Turn anvil (36) from hammer wheel (34) and place hole

in anvil to nearest position to
the marking on the wheel.
Take out anvil by hand. If anvil
is difficult to take out by hand,
put a bar into opposite side of
spline hole of the wheel and hit
bar softly with a hammer and
push the anvil out. When the
rotation of the anvil is difficult
because of any internal
damage, hold the wheel with a
vice, turn anvil to a rotatable
direction and dismantle as
above. Take out bushing (42),
plunger A (39), plunger B (41),
spring (40), cam (38), anvil

piece (37) and retainer (35)
from anvil. Clamp motor case C.P. (32) of impact wrench.
Unscrew four cap screws (23). Take out handle C.P. (1) and
motor housing gasket (24). Set motor case C.P. on a workbench.
While lightly tapping on end of rotor (28) with a plastic hammer,

take out rotor and rear end plate (26). Take out rear end plate
from rotor.

Reassembly

Always clean every part and coat every part with a thin film of oil
before reassembly. Apply a film of O-ring lubricant to all O-rings
before final assembly. Insert ball bearing (25) to rear end plate

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