Airetool 720 Series Manuel d'utilisation et d'entretien - Page 5

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OPERATION

The Model 720 AIRETROL is a trigger operated roll-

ing control with an automatic, torque controlled re-

versal. It is designed for use with regulated, filtered

and lubricated 90 psig air (measured at the tool in-

let), but can be used at lower pressures to lower the

minimum torque setting if required (with some loss of

free speed). The operator pulls the trigger to start the

tool (before engaging the expander mandrel in soft

tubes to avoid "staking" ) and holds it until the entire

rolling operation is completed. The tool expands to a

preset torque, reverses automatically and backs out

to release the mandrel. The tool stops and resets

when the operator releases the trigger between tubes.

If necessary, the tool can be started in reverse by

unscrewing the clutch housing (32) three or four turns

and pulling back gently on the tool before pulling the

trigger.

AIRETROL CLUTCH ADJUSTMENT

Remove clutch housing (32) (left hand threads) and

spindle/clutch assembly from tool, taking care to avoid

loss of push rod (52) or spring (51). Hold clutch driver

(58) with a 3/8" wrench and turn the adjusting nut

(39) with a 3/4" open end wrench (right hand thread).

Compressing the spring increases the torque setting.

Reinstall the spindle/clutch assembly and the clutch

cover carefully to avoid damaging the push rod. For

very light torque settings, the adjusting nut (39) can

be locked to the spindle with a #8-32 x 3/16" nylon

tipped set screw (not included).

CHANGING THE TORQUE REGULATING SPRING

Remove clutch housing (# 32) (left hand thread) and

spindle/clutch assembly from the tool. Remove the

socket head cap screw (# 46) and the chuck assem-

bly (35, 34, 33, 31, 30 & 29), wave washer (36), bear-

ing (37), c-ring (38), lock nut (39), lock washer (40

and regulating spring (41 and install the desired regu-

lating spring and reassemble parts in reverse order.

Make sure that the wave washer (36) is centered on

the bearing guard (35) (1/4" chuck) or chuck body

(34) (3/8" chuck) before securing the chuck. With the

1/4" chuck, it is important to always keep the screw

(46) tight to avoid excessive wear to the spindle (48)

and the chuck body (34). Set and test tool for proper

reversal before resuming operations - SEE CAUTION.

Operating Instructions

I F THE CLUTCH IS ADJUSTED OVER THE MAXI-

MUM POWER OUTPUT OF THE TOOL, THE

CLUTCH WILL NOT FUNCTION AND THE TOOL

WILL OPERATE LIKE A STALL TYPE TOOL. ALSO,

IF THE TOOL IS BEING OPERATED AT ITS UP-

PER TORQUE LIMITS, A DROP IN AIR PRESSURE

COULD CAUSE THE CLUTCH NOT TO FUNCTION

DUE TO A LOSS OF MOTOR POWER AND THE

TOOL WILL FUNCTION LIKE A STALL TYPE TOOL.

OPERATIONAL CHECK: GRIP TOOL SECURELY

AND BE PREPARED TO COUNTERACT STALL

TORQUE IN CASE THE CLUTCH IS IMPROPERLY

ADJUSTED.

AIR SUPPLY

The tool is designed to operate on 90 psig maximum

air pressure. The air pressure should be checked at

the tool's inlet when the tool is running. An automatic

in-line filter-lubricator is required. This will sustain the

tool with clean, lubricated air; keeping it in sustained

operation; and increase tool life.

For maximum performance, use a 1/4" I.D. minimum

air hose up to 8 ft.in length. If additional length is re-

quired, a 3/8" I.D. or larger hose should be connected

to the 1/4" hose (or use 3/8" I.D. hose or larger the

full length).

The air hose should be cleared of accumulated dirt

and moisture,. Then pour one half (1/2) teaspoon of

10W oil into the tool's air inlet before connecting the

hose to the tool. A new hose should be similarly lubri-

cated before placing in service. The tool should be

cycled several times to disperse the oil before rolling

tubes.

LUBRICATION

The in-line lubricator should be regularly checked and

kept filled with a good grade of 10W machine oil.

Application of the tool should govern how frequently

it is greased. It is recommended that the idler gears

receive a generous amount of No. 2 Moly grease af-

ter every 40 hours of operation. The clutch housing

(left hand threads) and the clutch/spindle/driver as-

sembly must be removed and the grease applied

through the hex in the spider.