Airetool 720 Series Operating & Service Manual - Page 7

Browse online or download pdf Operating & Service Manual for Power Tool Airetool 720 Series. Airetool 720 Series 12 pages. Airetrol rolling motor

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REASSEMBLY IN GENERAL

All parts should be washed in a solvent and inspected for

damage or wear. Particular attention should be given to all

bearings, gears, gear pins and rotor blades as failure of

these parts could cause damage to more expensive parts.

Rotor blades should be replaced if they measure less than

3/16" on either end. Inspect and replace any "O" rings or

seals that show signs of wear or deterioration. All gears,

gear pins and open bearings should receive a generous

amount of No. 2 Moly grease during reassembly. When

assembling the gear case to the back head, the case should

be torqued to 300/325 in. lbs. (33.9/36.7 Nm). Do Not Over-

tighten , as it can distort the valve assembly and cause the

valve to stick. Reassembly of all of the various sub-assem-

blies is in the reverse order of disassembly; however, the

following paragraphs list some of the more important reas-

sembly procedures.

CLUTCH ASSEMBLY

During the reassembly of the clutch assembly, all parts

should receive a thin coating of a mixture of 10W machine

oil and No. 2 Moly grease. The clutch (45), Tru Arc (44),

spring (53), spring bushing (54), trip (56), balls (47), cam

(43) and washer (42) must be in position on the clutch shaft

(48) before installing the spring pin (55). Install the spring

pin (55) so it is below the surface at both ends. The instal-

lation of the balls (47) can be simplified by filling the ball

slots in the shaft (48) with grease if desired.

MOTOR ASSEMBLY

Install the rear rotor bearing (28) into the rear bearing plate.

Press the bearing plate assembly (press on the bearing's

inner race) onto the rear rotor shaft until there is approxi-

mately .001" clearance between the rear bearing plate and

the rotor. Install the cylinder (25) with the slotted end to-

ward the front bearing plate.

If a new rotor or complete motor assembly is to be installed,

first install with RC609 Loctite, a push rod guide (61) - with

the countersunk end in first, and the other end flush with

the end of the rotor.

Service Instructions

VALVE ASSEMBLY

Install valve sleeve (66) with Loctite RC609. The deepest

notch (5/32" deep) in the sleeve must be flush with the

valve insert (64) at the end adjacent to the motor package

and the 1/16" diameter hole must be centered in the slot.

Allow Loctite to cure per instructions on Loctite container.

CLEAN sleeve thoroughly before installing the valve spool

(67). The spool must move freely with the valve washer

installed. Orient spool stop (62) as shown, and install pin

(65) flush with the inside of the spool stop.

PUSH ROD

It is essential that the push rod be straight and that the

ends be uniformly rounded and free from burrs, or erratic

operation can result. The length of the push rod (52) deter-

mines the location of the valve spool when the tool is run-

ning forward and has been sized to be used without trim-

ming in most cases. When installing a replacement push

rod - before screwing on the clutch cover, make sure that

the two washers (49 & 50) are in place and that the end of

the push rod does not touch the end of the trip (56) when

the spindle assembly is held tightly in position. If the rod

must be shortened, grind uniformly off the VALVE END of

the rod just enough to allow the trip to reset without inter-

ference.

SAFETY CHECK

After repair or replacement of parts, servicing or prolonged

storage, the tool should be tested to verify that the auto-

matic torque reversal device is functioning properly. SEE

CAUTION on page 5 !