Universal Air Tools UT8012 - 1/2 SQ - Manual (Page 2)

Page No 2
Safety Rules For A Ratchet 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.
2) Do not exceed the maximum working air pressure.
3) Use personal safety equipment.
4) Use only compressed air at the recommended conditions.
5) If the tool appears to malfunction remove from use
immediately and arrange for service and repair.
6) If the tool is used with a balancer or other support device
ensure that it is fixed securely.
7) Always keep hands away from the working attachment fitted
to the tool.
8) The tool is not electrically insulated. Never use the tool if there
is any chance of it coming into contact with live electricity.
9) Always when using the tool adopt a firm footing and/or
position and grip the tool firmly to be able to counteract any
forces or reaction forces that may be generated whilst using the
tool.
10) Use only correct spare parts. Do not improvise or make
temporary repairs.
11) Do not lock, tape, wire, etc. the on/off valve in the run
position. The trigger/lever etc. must always be free to return to
the 'off' position when it is released.
12) Always shut off the air supply to the tool, and depress the
trigger/lever etc. to exhaust air from the feed hose before fitting,
adjusting or removing the working attachment.
13) Check hose and fittings regularly for wear. Replace if
necessary. Do not carry the tool by its hose and ensure the hand
is remote from the on/off control when carrying the tool with
the air supply connected.
14) Take care against entanglement of moving parts of the tool
with clothing, ties, hair, cleaning rags, etc. This will cause the
body to be drawn towards the tool and can be very dangerous.
15) It is expected that users will adopt safe working practices
and observe all relevant legal requirements when installing,
using or maintaining the tool.
16) Do not install the tool unless an easily accessible and easily
operable on/off valve is incorporated in the air supply.
17) Take care that the tool exhaust air does not cause a problem
or blows on another person.
18) Never lay a tool down unless the working attachment has
stopped moving.
19) Always ensure that the reverse button is in the selected
position before starting the tool.
20) Do not use sockets with excessive wear to the input and
output drives. Periodically check the square drive on the ratchet
wrench. Make sure the socket, extension is firmly fixed to the
tool.
21) When loosening fasteners first ensure that there is sufficient
clearance behind the tool to avoid hand entrapment. The tool
will move away from the threaded joint as the nut/bolt is
loosened and rides up the thread moving the tool with it.
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.
Operating
Fit securely to the tool the socket or attachment required to
perform the operation. Ensure that the reverse button situated
on the opposite side to the square drive output shaft is in the
correct position for tightening or loosening the fastener.
The nut/bolt can then be run down the thread using the power
drive of the tool. When the tool stops the handle of the tool can
be used as a ratchet lever and operated to give the required
tightness of the joint.
For loosening a joint the tool can be used in the reverse
sequence.
Dismantling & Assembly Instructions
Disconnect tool from air supply.
Grip motor housing with bushing (1) in a vise fitted with soft
jaws. With a snap ring plier, remove the retaining ring (52). By
using a adjustable wrench, unscrew the air hose assembly (53),
inlet bushing (50) and inlet bushing (12) then separate o-ring
(14), connecting ring (51), muffler (13) and o-ring (14). Unscrew
valve screw (11) and remove o-ring (10), (9), air regulator (8),
spring (7), throttle pin (6), o-ring (5), (4). Use a proper steel bar,
tap out pin (3) and remove throttle lever (2) from motor housing
with bushing (1). Release housing with bushing (1) from vise,
slide off comfort grip (48) from housing with bushing (1) then
return housing with bushing to vise.
Remove retainer ring (46) and by moving ratchet yoke (34) from
side to side to push out the complete ratchet anvil assembly out
of the ratchet housing (30). Remove the thrust washer (45),
steel balls (44) and springs (43). Rotate reverse button (35) until
a semi-circular groove in it lines up with pin (40). Then, tap out
pin (40) by using a suitable punch, remove ratchet pawl (42) ,
lock pin (37), spring (36) and reverse button (35) from ratchet
anvil (41). Do not try to remove the steel ball from the drive of
ratchet anvil (41) and only remove roll pin (39) from ratchet anvil
(41) when a replacement is required. Remove ratchet yoke (34),
washer (38), drive bushing (33) and crank shaft (32) from
ratchet housing (30). Unscrew lock ring (28) from internal gear
(25) then unscrew ratchet housing (30) (left hand thread) from
lock ring (28). With a suitable punch, tap needle bearing (31),
bushing (29) out of ratchet housing (30) slightly. Remove planet
gear carrier (27) and planet gears (26) from internal gear (25).
Do not remove any of the pins from planet gear carrier (27). Use
a special wrench which locates in the teeth of the internal gear
(25), unscrew the internal gear (25) from motor housing with
bushing (1). If this proves to be difficult to unscrew, provide
some local heating to the lock ring (28) and/or internal gear (25)
to soften and break the grip of the thread locking sealant. Pull
out the motor assembly from housing with bushing (1). Grip the
front end plate (22), to avoid the splines of rotor (20) from
damage, use a rubber hammer , slightly tap the splined end of
the rotor (20) through the front end plate (22) and ball bearing
(23) assembly. Take off cylinder (19) and remove rotor blades
(21). With a suitable punch, tap the rear end of rotor (20) slightly
to separate rotor (20) from rear end plate (17). Then, press out
ball bearing (23) from front end plate (22) and ball bearing (16)
from rear end plate (17). Do not remove the steel balls (18) from
front end plate (22) and rear end plate (17) unless replacements
are required.
Reassembly
Clean all parts and examine for wear. Look in particular for wear
and cracks on ratchet pawl (42), ratchet anvil (41) and ratchet
yoke (34). Coat all parts with a pneumatic tool lubricating oil and
grease all bearings, gears, and ratchet mechanism parts with a
molybdenum or lithium based general purpose grease. Before
reassembling the motor, make sure that the faces of rear end
plate (17) and front end plate (22) that abuts cylinder (19) are flat
and free from burrs. If necessary, lap on a flat, very fine grade of
abrasive paper. Reassemble in the reverse order. When refitting
the complete motor assembly to the housing with bushing (1),
make sure that the assembly is clamped tightly together and the
rotor spins freely, ensure the steel ball (18) in the side of front
end plate (22) locates in the slot in motor housing with bushing
(1).