Universal Air Tools UT5315 User Manual

Operator Instructions

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

Important

Read these instructions carefully before insta lling, 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

3/4 Square Drive Pistol
Grip Impact Wrench

Model No/Nos Serial No

UT5315

HP14 3BY

Tel No Fax No

[phone] (01494) 883237

RPM

5000

Cycles Per Min

Product Nett Weight

9.90

4.50

lbs
Kg

Recommended Use Of

Balancer Or Support

No

Air Pressure
Recommended Working
Recommended Minimum
Maximum

6.3

n/a

7.0

bar
bar
bar

90

n/a

100

Perso n a l Sa fe t y E q ui pm en t

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 threade d fas ten er s w ithin the ra nge as spe cifie d by the
manufacturer. It should only be used in conjunction with suitable
impact type 3/4" 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
with out co nsul ti ng th e ma nufa ctur er or th e man uf act urer 's
authorised supplier. To do so may be dangerous.
Never u se an impact wre nch as a ha mmer to dislodge or
straighte n cross threaded fas teners. Never a ttempt 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 recom-
mended 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 loosen-
ing fasteners the tool can move quite quickly
away from the fastener being undone. An
allowanc e must alway s be made for this
rearward movement so as to avoid the pos-
sibility of hand/arm/body entrapment.

Recommended Hose Bore

Recommended Max.

Size - Minimum

3/8 10 30 10

Ins M/M Ft M

Noise Level

PSI

Test Method

PSI

test code PN8NTC1 and ISO Standard 3744

PSI

Vibration Level

Test Method

Sound Pressure Level 85.7 dB(A)
Sound Power Level 96.7 dB(A)

Tested in accordance with Pneurop

5.8

Tested in accordance with ISO

standards 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 depresse d and the air regu lator 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 sys tem withou t incorporating an easy to reach a nd
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

Hose Length

Metres / Sec²

Page No 1

into the intake bushing (21) a teaspoonful (5ml) of a suitable
pneumatic motor lubricating oil preferably incorporating a rust
inhibitor. Reconnect tool to air supply and run tool slowly for a
few sec onds 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. When lubricating, also ensure that screen (1) is
clean.
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 p si o perat io n and an i ncrea sed o utp ut fo r hig her
pressures. Hence it is possible that changes in supply pressure
can gi ve si tuat io ns wher e the fast ener i s und er o r o ver
tightened. For changes in pressure, the regulator position and
application should be reassessed.
It is recommended that joint tightness of the threaded fastener
assembly be checked with suitable measuring equipment.

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 a t a given
pressure operated for a given time.
The air regulator item (26) 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 ten sion requ ired to be applied to the th readed
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 se t. The tool is now s et to duplicate tha t 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 wre nch is rated a 3/4" bolt size.
Rating must be down graded for spring U bolts, tie bolts, long
cap sc rews, double depth nu ts, badly rusted con ditions and
spring fasteners as they absorb much of the impact power.
When possible, clamp or wedge the bolt to prevent spring back.
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 from air supply.
Remove red boot (56) remove clamp screw (13) and drain the
oil in the front end into a suitable container. Grip motor housing

Page No 2

(1) in a vice and tap out spring pin (28). Pull out air regulator
(26) with o-ring (27). Take out screw (9) and remove deflector
(8). Unscrew retainer plug (31) take out stop pin (29) and
spring (30) and it will be possible to push out the reverse valve
(25) from the motor housing (1). Unscrew 4 off screws (4) with
washers (5) and tap the square drive end of the anvil shank
(51) and this will drive the motor and hammer assemblies out
of the rear end of the motor housing (1). Pull off the hammer
mechanism from the motor assembly. The hammer
mechanism maybe pulled apart separating the anvil shank (51)
spring (50) drive cam (48) 2 off anvil hammer bars (49) steel
ball (47) drive cam base (46) hammer cage (45) and anvil
washer (52). Note the notch in the spline of the anvil shank
(51) and the wide splined tooth drive cam (48) for correct
reassembly. Anvil collar (54) and o-ring (53) maybe prised off
the anvil shank (51) oil seal (7) maybe prised and the anvil
bushing (6) pressed out of the motor housing (1). Unscrew 3
off rotor screws (43) and washers (44) and take off end cap (2)
and gasket (3). It is then possible to pull the motor assembly
apart but first note the orientation of the cylinder (37) to the
front and rear end plates before pulling off the front and rear
plate assemblies from the rotor (38). Remove 6 off rotor blades
(39) from rotor (38). With a suitable punch tap out bearings
(32) and (41) remove oil seals (33) from rear plate (40) and
front plate (34). Prise out o-ring (35) from the grove in front
plate (34).

Reassembly

Clean all component parts and examine for wear and cracks
etc. before reassembling Look in particular to wear and cuts on
o-rings and oil seals, wear on rotor blades and wear and
cracks on hammer bars (49) and anvil (51) particular around
the square drive. Check carefully cage (45). Make sure that the
faces of the end plates (40) and (34) about cylinder (37) are flat
and free from burrs and surface marking. If necessary lap faces
on a flat, very fine grade of abrasive paper. Lightly coat all parts
with suitable pneumatic tool lubricating oil and reassemble in
the reverse order (See note below).

Note in particular

a) that the hammer bars (49) -2 off are located in the two

identical shaped grooves in the hammer cage (45).

b) that the cut away portion of the front flange of the cylinder

(37) abuts the two notches in the face of the front plate

(34).
On completing assembly ensure that all parts are locked tight
and the anv il rotates a nd the trigger, reve rse v alve a nd air
regulator mechanisms operate freely. Remove oil plug (13) and
pour in one ounce (28cc) of standard SAE20 grade oil. Do not
over fill as this will result in a reduction of power in the tool
performanc e. Pour approx 5ml of a good quality pneuma tic
lubricating oil (preferably one containing a rust inhibitor) into the
air intake with the trigger depressed. Connect tool to a suitable
air supply and reset for operation required. Refer to section on
operation instructions.

Safety Rules When Using an Impact
Wrench

1) Read all the instructions before using this tool. All operators
must be fully trained in its use and aware of these safety rules.
All service and repair must be carried out by trained personnel.

2) The socket used must be of the correct drive size and the
"impact" type. Never use sockets other than impact type.

3) Do not use sockets with excessive wear to the input and
output drives. Check that the square on any other type of drive
or the impact wrench is not cracked or excessively worn before
fitting or changing socket, extension, etc. Make sure that the
socket is firmly fixed to the tool.

4) Always ensure that a stable position or footing is adopted
before using the tool.