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Dismantling & assembly instructions, Safety rules when using a drill, Reassembly – Universal Air Tools UT8824 User Manual

Page 2: Motor assembly

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Operating

Select suitable drill bit, insert the shank into the drill chuck as far

as possible and tighten chuck with key supplied making sure

that the shank of the device is securely clamped centrally

between the three chuck jaws. Remove chuck key.

When drilling holes of all sizes it is advised to use a pointed

punch to mark the centre at which the hole is to be drilled as

this will provide a starting point for the drill tip. This procedure

will prevent the drill bit from skidding, ensure that the hole is

drilled where intended and help to prevent drill breakage when

using small drills. When drilling, particularly with small diameter

drills, always try to ensure that load applied to the drill is such

that the drill bit is always at right angles to the hole being drilled.

Do not force the drill but allow it to cut.

When drilling always adopt a firm posture to be able to

counteract any sudden movement of the drill due to torque

reaction. Such torque reaction can occur when the drill stalls

due to a too heavy load being applied or the material being too

hard or tough. The torque reaction can occur when the drill

breaks through the material being drilled, particularly on sheet

metal. Always use eye protection and hand protection is

advised, particularly when drilling holes in metals where the

material being removed from the hole is in the form of long

sharp strips. Do not tie the drill chuck key to the drill as the

attaching device i.e. string or chain could become entangled

with the rotating chuck and bit etc.

If using an abrasive device, drilling stone or performing any

operation where dust is created, it is recommended to use a

breathing mask.

Always ensure that the material to be drilled is firmly fixed to

prevent its movement.

It is also recommended that when drilling holes of large

diameter to first pre drill a hole of smaller diameter as this will

reduce effort required to drill the hole and minimise torque

reaction.

Dismantling & Assembly Instructions

Disconnect drill from air supply.

The drill chuck (25) may be removed by placing the chuck

adjusting key securely in the chuck and giving the key a sharp

tap with a hammer in the direction to loosen a right hand

threaded joint. If this fails to remove the chuck remove it after

the gearbox assembly has been removed from the drill handle.

(See later). Place motor housing (1) in a vice fitted with soft jaws

with the handle section pointing upwards, unscrew bushing

(26), remove screw (4) and exhaust deflector (3). Unscrew

locknut (24) to remove gearbox and pull out motor assembly.

If the drill chuck has not been removed as it is too tightly fitted,

it can be removed as follows. Pull off ring gear (20) from

gearbox and pull off 3 off idler gears (21). Use a suitable square

section bar inserted between the pins in idler gear plate (22),

pushed up against the face to ensure that contact is made at the

bottom of the pins and unscrew the chuck using the chuck key.

Do not use a round bar or locate at the outer edge of the pins

as this may distort the 3 pins. A length of 8mm (0.312) square

bar is ideal for this purpose. Continue to dismantle the gearbox

by supporting ball bearings (23) on the gear side in a piece of

tube of suitable bore to just clear the largest diameter of idler

gear plate (22) and press out idler gear plate from bearings 2

off- (23). It is recommended that the pins in the idler plate (22)

are not removed for replacement and the complete idler gear

plate (22) is replaced. For information the nominal diameter of

the three pins in the idler plate (22) is 0.1574 ins (4 mm).

Replacement is required if the pins are badly damaged or worn

below 0.155 (3.937 mm) diameter.

To dismantle motor assembly grip the front end plate (19) tightly

by hand and tap the gear end of the rotor with a non metallic or

soft metal (lead or aluminium) hammer through the front end

plate (19) and bearing (13). Remove 4 off rotor blades (17) and

cylinder (18). Hook out plastic shield from rear end plate (14).

Support rear end plate (14) in a piece of tube with a bore size

as close as possible to the largest diameter of the rotor (14) and

tap the non splined end of the rotor to remove it from the rear

end plate and bearing assembly. Tap out bearing (13) from rear

end plate (14) and bearing (13) from front end plate (19).

Tap out trigger retaining pin (2) and pull out trigger assembly.

Remove trigger (10) from valve stem (6). Remove valve stem (6)

from valve bushing (9) and remove O-Rings (5). Remove 2 off

O-Rings (7) and O-ring (8) from valve bushing (9).

Reassembly

Clean all component parts and examine for wear before

reassembling. Use only manufacturers or distributor supplied

spare parts. Check in particular for wear and cuts on O-Rings

and wear on rotor blades. Lightly coat all parts with a suitable

pneumatic tool lubricating oil. Pack all bearings and gearbox

with a general purpose lithium or molybdenum based general

purpose grease.

Assemble in reverse order - see notes below.

Motor Assembly

If fitting a new rotor very lightly deburr the edges of the rotor

slots. Make sure rotor blade slots are clean. Make sure that the

faces of the front and rear end plates (19) and (14) that abut

cylinder (18) are free from burrs and surface marking. If

necessary lap faces on a flat, very fine grade of abrasive paper.

Press bearing (13) into end plates (14) and (19). Support bearing

(13) in rear end plate on the inner race and tap rotor on the gear

end with a soft metal or non metallic hammer until the rotor

locates against the face of the rear end plate. Support the inner

face of the rear end plate in a piece of tube with a bore diameter

as close as possible to the largest diameter of the rotor and tap

the non splined end until a clearance of 0.040mm (0.0015") to

0.065mm (0.0025") is obtained between the inner face of the

rear end plate and the rotor. This clearance to be checked when

pulling the rotor by hand away from the rear end plate and

bearing assembly.

Spin rotor to ensure that it will spin freely in the rear end plate

and bearing assembly. Fit rotor blades and cylinder ensuring that

the pin in one end of the rotor cylinder locates in the round hole

in the rear end plate. Push on front end plate and check that

rotor still rotates freely.

Reassemble tool in reverse order.

pressing the trigger on the tool. Disconnect the air line and pour

into the intake bushing 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 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.

Page No 2

Safety Rules When Using A Drill

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) Always select a suitable cutting, abrasive device suitable for

use with this drill.

3) Always shut off the air supply to the drill and depress the

trigger to exhaust air from the feed hose before fitting, adjusting

or removing the device. Remove drill chuck.

4) Always adopt a firm footing and/or position and be aware of

torque reaction developed by the drill.

5) Use only correct spare parts.