Universal Air Tools UT8018A - 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.
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 the air supply.
Grip the tool in a vice fitted with soft jaws on the flats at the rear end of
motor housing (1) and unscrew inlet bushing with screen (2) and O-ring
(47). Drive out spring pin (3) and take off lever (4). With a wide bladed
screwdriver unscrew valve screw (5) with O-ring (6) and from the lever
side push out valve stem (9), spring (7), O-ring (8), air regulator (49) and
O-ring (50). O-ring (8) may be removed from valve stem (9). Do not
press out bushing (45) unless a replacement is required. Remove circlip
(43) and by pushing on reverse button (34) and moving Yoke (33) from
side to side, the front end drive assembly may be removed from the tool.
Remove thrust washer (42), washer (51) and 2 off steel balls (27) and 2
off springs (40) from ratchet anvil (39). Do not remove the socket
retaining balls from ratchet anvil (39) unless replacements are required.
Tap out needle roller (35) and remove pawl (38), lock pin (37) and
spring (36). Pull out reverse button (34) but do not remove spring pin
(30) from ratchet anvil (39). Look through the slot in the side of ratchet
housing (28) and centralise the pin end of crankshaft (31) and it is then
possible to slide out from ratchet housing (28) the yoke (33) and drive
bushing (32). Pull out crankshaft (31). Unscrew clamp nut (21) with
ratchet housing (28) from motor housing (1). Unscrew ratchet housing
(28) from clamp nut (21) - left hand thread. Take out idler gear plate (25)
with three off needle rollers (26). It is now necessary to unscrew internal
gear (24) from motor housing (1) and this requires a special wrench
which locates in the teeth of internal gear (24). Seek advice from your
distributor or service depot. Remove washer (22). Carefully grip the
splined end of rotor (15) and pull out the motor assembly complete from
motor housing (1). Prise out bearing cap (10) from rear end plate (14).
Grip front end plate (19) and tap the splined end of rotor (15) with a soft
metal (lead or aluminium) hammer to drive the rotor (15) through front
end plate (19) assembly. Tap out bearing (20) from front end plate (19).
Take off cylinder (18) noting how it locates to rear end plate (14) via
spring pin (17). Remove 4 off rotor blades (16) from rotor (15). Support
the cylinder side of rear end plate (14) in a piece of tube with a bore
diameter as close as possible to the largest diameter of rotor (15) and
tap the non splined end of rotor (15) to drive it through rear end plate
(14) assembly. Tap out bearing (13) from rear end plate (14). Bearing
(23) and needle bearing (29) may be pressed out of ratchet housing
(28).
Reassembly
Clean all parts and examine for wear, damage etc. before reassembling.
Look in particular for wear and cracks on pawl (38), yoke (33), ratchet
anvil (39), drive bushing (32) and crankshaft (31). Check for wear on
rotor blades (16).
For the motor assembly ensure that the faces of front end plate (19) and
rear end plate (14) that abut cylinder (18) are clean and free from burrs.
If necessary lap these faces on a flat fine grade of abrasive paper.
Coat all parts with a pneumatic tool lubricating oil and grease all
bearings, gears and ratchet head parts with a lithium or molybdenum
based grease and assemble in the reverse order.
Note:- When servicing the tool it is good practice to replace springs (40)
and spring (36) if the reverse button slips or is inclined to slip.