Ingersoll-Rand 8355A, 8255-A User Manual

SECTION

ARO.

OPERATOR’S MANUAL

INCLUDING: OPERATION, INSTALLATION & MAINTENANCE

PAR-A-MATIC® SELF-FEED DRILLS

MANUAL Released: 8/9O Revised: 11-20-98 Form:

Models 8255-A( )-( ) and 8355A( )-( )

IMPORTANT: READ THIS MANUAL CAREFULLY BEFORE INSTALLING,

OPERATING OR SERVICING THIS EQUIPMENT.

M103

1612-2

OPERATING AND SAFETY PRECAUTIONS

Keep hands and clothing away from rotating end of tool.

Wear suitable eye protection while operating tool.

Disconnect air supply from tool before removing/installing bit or performing other maintenance procedures.

ROUTINE LUBRICATION REQUIREMENTS

Lack of or an excessive amount of lubrication will affect the performance and life of this tool. Use only recommended lubricants at below time intervals:

EVERY 8 HOURS OF TOOL OPERATION - Fill air line lubricator reservoir of recommended F.R.L. with spindle oil (29665).

EVERY 180 HOURS OF TOOL OPERATION - Inject NLGI #1 “EP” grease (33153), 1 to 2 strokes, thru grease filling in gear housing. NOTE: Spindle must be extended from outer sleeve suf-

ficiently to expose grease fitting in gear housing. Gearing should contain approximately 1/8 oz. (3.5 g) of grease per set of gears.

AIR SUPPLY REQUIREMENTS

For maximum operating efficiency, the following air supply specifications should be maintained to this air tool:

AIR PRESSURE - 90 PSIG (6 bar)

AIR FILTRATION - 56 micron

. LUBRICATED AIR SUPPLY

HOSE SIZE - 5/16” (8 mm) I.D.

An ARO® model C28221-810 air line FILTER/REGULATOR/LUBRICATOR (F.R.L.) is recommended to maintain the above air supply specifications.

MOUNTING

The nose end of the outer sleeve (43) is provided with 2” - 16 L.H. threads (remove thread guard [49] for use) and a 2” x 1-1/8” long pilot diameter for fixture mounting. Foot and flange type mounting brackets are available for tool mounting.

RECOMMENDED LUBRICANTS

After disassembly is complete, all pans, except sealed or shielded bearings, should be washed with solvent. To relubricate parts, or for routine lubrication, use the following recommended lubricants:

Where Used

Air Motor

“0” Rings 8 Lip Seals 36480

Gears and Bearings 33153

29665

1 qt. Spindle Oil

4 oz. Stringy Lubricant

5 lb. "EP" - NLGI #1 Grease

SET-UP PROCEDURE

WARNING: Keep clear of rotating end of unit with hands and/or clothing. Keep fingers/hands from being pinched between housing or valves and adjustment screws and/or trip bracket.

Loosen two screws (31) and remove cover (1).

Allow a minimum distance of 1/4" between the drill point of the unit and the workpiece (this is necessary for the air motor to start and reach free speed before the drill point touches the workpiece).

Determine the TOTAL STROKE LENGTH the drill must travel

to perform the drilling operation - see illustration below.

Loosen jam nut (8) and turn adjustment screw "A” so the distance between the end of the screw and the stud (28) equals the Total Stroke Length.

lighten jam nut (8).

Loosen jam nut (8) and turn adjustment screw ”B" (valve-it+ head models only) so the distance between the end of the screw and the button bleed valve (27) is slightly GREATER than the distance set for adjustment screw “A,.

Start and let unit advance until the adjustment screw “A". makes contact with the stud (28).

Carefully, and be aware that the unit is going to retract, turn the adjustment screw “B" until it depresses the button bleed valve (27) enough to cause the unit to retract.

Tighten jam nut (8).

See “FEED RATE CONTROL VALVES”, page 2.

For parts and service information, contact your local ARO distributor, or the Customer Service Dept. of the Ingersoll-Rand Dis-

tribution Center, White House, TN at PH: (615) 672-0321, FAX: (615) 672-0801.

ARO Tool Products

Ingersoll-Rand Company

1725 U.S. No. 1 North

P .O. Box 8000 l Southern Pines, NC 28388-8000

PRINTED IN U.S.A.

FEED RATE CONTROL VALVES

REMOTE OPERATION

Turn valve (24) marked “R” on top of housing, approximately

1-1/2 turns counterclockwise (open). Turn the other valve (24) marked “F" on top of housing, clock-

wise until closed (do not tighten too snugly). Start the unit and slowly turn valve (24) marked “F", counter-

clockwise (open) until the desired forward rate of feed is reached. A final adjustment of the rate of return (retract) can be made

with the valve (24) marked “R” on housing.

MANUAL OPERATION

Install button bleed valve (27) in either the “F" port located at

top of valve housing or the “F" port located at the rear of valve housing. NOTE: Unused port must be plugged with pipe plug

(22). Depress button bleed valve (27) marked “F" on valve housing.

The unit will start in the forward (advancing) mode and continue to feed forward until the adjusting screw “B” has depressed bleed valve (27) marked “R” to retract the unit. See set-up procedure. A manual emergency retract button bleed valve (27) can be

installed in “R” port at top of valve housing if desired. This valve can be used to immediately retract the unit in case of misaligned part or other emergency. Valve not furnished.

RECOMMENDED POWER AIR INLET SYSTEM

Install a pressure bleed valve - ARO part number 9600 - in valve port marked “F" at either the top or rear of valve housing Connect pressure bleed valve - using 1/8” i.d. tubing - to a remote operated valve which, when actuated, feeds air pressure to the pressure bleed valve. Pressure bleed valve will bleed the air from "F" port of valve housing causing spool valve in housing to shift to the forward feed position, thus starting the forward stroke of the unit. Install a pressure bleed valve - ARO part number 9600 - in

valve port marked “R” at the top of the valve housing and connect - using 1/8” i.d. tubing -to a remote MANUALLY operated valve. This valve is used as an emergency retract in case of a part misalignment or such only as the unit, when properly set-up and applied, will automatically retract and return to the start position. See set-up procedure. Refer to page 10 for plumbing and schematic diagrams.

SPECIAL NOTE: The air inlet and remote ports of valve housing have tapered pipe threads and should not require the use of thread sealants, such as sealant tape or pipe joint compounds. Thread sealants, when used improperly, can contaminate air passages and cause valve or unit to malfunction.

Your ARO self-feed tool is designed to deliver specific horsepower and thrust to achieve high rates of work. To assure the unit will develop this power, care must be that the power air inlet system is correctly sized to permit the proper rate of air flow. Shown is a system for a single tool that will supply correct delivery. IMPORTANT tool is power rated when 90 p.s.i. is present at the tool during operation.

Shown below is the same system in schematic form.

SUPPLY

If two or three units are to be installed, each unit should be supplied with a system like that shown below or use a system like that above for each tool.

1/4” CAPACITY

3/8” CAPACITY

1/4” CAPACITY

F = FILTER R = REGULATOR L = LUBRICATOR

FILTER MODEL 25231-110 REGULATOR MODEL R27231-100 LUBRICATOR MODEL L26221-110

‘-the

taken

SET-UP PROCEDURE WITH OPTIONAL HYDRAULIC CHECK

Assemble hydraulic check to mounting bracket and assemble mounting bracket to tool, using washers (30997) and cap screws (Y157-44). Measure distance from drill point to work piece - distance “Y". Distance “X” between hydraulic check plunger and trip bracket must be less than distance “Y" to prevent damage to drill point when it approaches the work piece. Loosen the cap screws (Y15744) and position hydraulic

check to obtain correct setting for distance “X”. Tighten cap screws (Y157-44) securely before operating unit. Increase the air flow thru the feed control valve marked “F" by opening two (2) full turns from closed position. This will allow drill to advance rapidly until the trip bracket contacts plunger of hydraulic check. The hydraulic feed rate adjustment is located at the nameplate end of the hydraulic check. Rotate extended spindle until

FEED BATE ADJUSTMENT

the slot on the spindle is located midway between the highest and the lowest settings.

Start the drill unit and the drill will advance at a rapid rate until the trip bracket contacts plunger of hydraulic check.

Slowly rotate the hydraulic feed rate counterclockwise for faster feed rate or clockwise for slower feed rate

TO CONTROL BREAKTHROUGH

Position hydraulic check so the distance between the plunger

and the trip bracket (distance "X”) is less than the distance from the drill point to the opposite side of the work piece (distance "W").

M103

DISASSEMBLY/ASSEMBLY INSTRUCTIONS

Never apply excessive pressure by a holding device which

may cause distortion of a part. Apply pressure evenly to parts which have a press fit. Apply even pressure to the bearing race that will be press fitted to the mating part.

Use correct tools and fixtures when servicing this tool.

Don’t damage “0” rings when servicing this tool.

Use only genuine ARO replacement parts for this tool. When ordering, specify part number, description, tool model number and serial number.

GEARING DISASSEMBLY

Remove chuck from gearing. Thread adjustment screws (6 and 7) all the way back and push the piston rod (51) all the way forward to expose wrench flats of motor housing (52) from the outer sleeve (43). Using wrenches on flats of ring gear and motor housing, un-

thread gearing from motor housing.

If tool has double gearing, unthread ring gear (87) from adapt-

er (78). DIRECT DRIVE models: Unthread and remove bearing lock nut (113). Grasp ring gear in one hand and tap threaded end of the spindle with a soft face hammer; spindle and components will loosen from ring gear. Remove bearing(s) and shafts from spindle to remove gears.

To remove bearings (89) from ring gear, remove lock nut (90).

48044-1 GEARING DISASSEMBLY

SEE PAGE 11 FOB HYDRAULIC CHECK DIMENSIONAL DATA.

Using wrenches on flats of ring gear and motor housing, un-

thread gearing from motor housing.

Pull spindle (100) and components from ring gear (102). Remove bearing (70) and spacer (99). Remove shafts (81). releasing gears (82). Remove retaining ring (101), releasing shafts (72) and gears (73 and 75). Remove lock nut (90) from ring gear, releasing bearings (89) and spindle (104).

GEARING ASSEMBLY

Assemble gears to spindle and secure with shafts. Align notch in end of shaft with step on spindle (align notch of shaft with spacer for auxiliary gearing). NOTE: Be sure each

shaft (72) contains 15 needle bearings. Pack bearings with ARO 33153 grease and assemble spacer (71) and bearing (70) to spindle. Lubricate gears of spindle liberally with ARO 33153 grease and assemble spindle to ring gear. Pack bearings (89 or 110) with ARO 33153 grease and as-

semble to spindle with the ‘unmarked” faces of bearings facing

each other (identification markings on beatings facing out). Assemble seal (91) to lock nut (90) and secure bearings (89)

with lock nut. DIRECT DRIVE models: Assemble bearing lock nut (113) to spindle. Assemble spindle nut (92) to spindle. Assemble gearing to tool. Assemble chuck (117) to spindle.

Remove chuck from gearing.

Thread adjustment screws (6 and 7) all the way back and

push the piston rod (51) all the way forward to expose wrench flats of motor housing (52) from the outer sleeve (43).

48044-1 GEARING ASSEMBLY

Pack bearings (89) with ARO 33153 grease and assemble to spindle (104).

DISASSEMBLY/ASSEMBLY INSTRUCTIONS

Lubricate needle bearing (103) with ARO 33153 grease and as-

semble to spindle (104) and assemble spindle to ring gear (102). Assemble seal (91) to lock nut (90) and assemble lock nut to ring gear, securing bearings and spindle. Assemble spindle nut (92) to spindle. Assemble gears (82) to spindle, securing with shafts (81). Assemble spacer (99) and bearing (70) to spindle, securing shafts. Assemble gears (73 and 75) to spindle, securing with shafts (72) and retaining ring (101). NOTE: Be sure each shaft contains 15 needle bearings. Lubricate gears liberally with ARO 33153 grease and assemble spindle to ring gear.

Assemble gearing to tool. Assemble chuck (117) to spindle.

MOTOR DISASSEMBLY

Remove gearing from tool as previously outlined.

Remove spacer (88) and motor assembly from housing. Remove cap (54) and shield (55). Grasp cylinder in one hand and tap splined end of rotor with a soft face hammer; motor will come apart.

MOTOR ASSEMBLY

Assemble bearing (56) to end plate (57), pressing on outer race of bearing. Assemble end plate (57) to rotor, pressing on inner race of bearing.

Coat i.d. of cylinder (61) with ARO 29665 spindle oil and assemble cylinder to end plate (57), aligning roll pin in cylinder with hole in end plate. Coat blades (59 or 66) with ARO 29665 spindle oil and insert into rotor slots - straight side out. Assemble bearing (63) to end plate (62), pressing on outer race of bearing. Assemble end plate (62) to cylinder, pressing on inner race of bearing. Be sure rotor does not bind (if rotor binds, tap splined end of rotor lightly to loosen). Assemble shield (55) and cap (54) to end plate (57).

Assemble motor and spacer (68) to motor housing.

Assemble gearing to tool.

AIR PISTON DISASSEMBLY

Remove gearing and motor assembly as outlined. Remove cover (1) adapter (3) washer (4) and trip bracket (5). Place valve housing in a suitable holding device with the outer

sleeve in an upright position.

Using a strap wrench on outer sleeve (43), unthread (L.H.

threads) and CAUTIOUSLY remove outer sleeve straight up and off from valve housing to prevent bending of air cylinder

(37) and damaging the inside diameter. Handle the air cylinder (37) with care so its fine cylindrical

shape is not distorted in any manner.

If the air cylinder remains inside the outer sleeve when the

sleeve is removed, push the piston rod (51) forward then pull it backward. The cylinder will then extend from the sleeve and can now be removed. Remove “0” ring (33) and retaining ring (34). Push piston rod and motor housing out thru gear end of outer sleeve. Piston (36) will drop out when motor housing and pis-

ton rod are removed from outer sleeve.

Insert a suitable rod thru gear end of outer sleeve and push muffler cap (41) out thru valve end of outer sleeve. Piston rod (51) and motor housing (52) are secured with a hard drying thread adhesive. If it should become necessary to sepa-

rate these two parts, heat the threaded area lightly to soften the adhesive and unthread the rod from the housing (R.H. threads).

AIR PISTON ASSEMBLY

NOTICE: When a part containing “0” rings has been removed from the tool, it is recommended that the “0” rings be replaced with new ones when reassembling the part to the tool. Lubricate all “0” rings with ARO 36460 “0” ring lubricant.

Assemble retaining ring (38) “0” ring (39), “0” ring (40) and screen (42) to muffler cap (41). Assemble muffler cap (41), screened end first, to outer sleeve (43) from end of sleeve with internal threads. Push muffler cap into sleeve until it bottoms against step in sleeve. Coat torque pin (44) with grease to retain pin in place and assemble inside outer sleeve in hole provided. Assemble “0” ring (50) to piston rod. Assemble motor housing and piston rod to outer sleeve thru end of sleeve with external threads and push piston rod thru muffler cap, using care not to damage “0” ring (39) contained in muffler cap. Align slot in motor housing with torque pin (44). Assemble seals (35) to piston (36), with lips of seals facing

away from each other. Assemble piston (36) to piston rod (51) and push piston on rod until it seats against “0” ring (50) and step on rod. Assemble retaining ring (34) to groove in piston rod, securing piston on rod. Assemble “0” ring (33) to piston rod and slide on rod until it seats against retaining ring (34). Clamp valve housing (10) in a suitable holding device, with the threaded end of housing upright. Coat i.d. of air cylinder (37) with “0” ring lubricant 36460 and place air cylinder on valve housing (10) over "0" ring (30). Using care not to damage “0” rings (11) contained in housing, insert piston rod (51) thru housing and carefully locate outer sleeve over air cylinder and thread sleeve to housing. Tighten securely using a strap wrench. Assemble motor, gearing, trip bracket and components and assemble cover (1) to housing.

VALVE HOUSING DISASSEMBLY

The valve body (14), feed control valves (24) and button bleed valves (27) can be serviced without removing outer sleeve from valve housing. To gain access to check valves (17) and components or “0” rings (11), follow disassembly procedure for removing the air piston.

Remove both caps (12) and “0” rings (13) - models 8255-A-( )

only. Push valve body (14) out thru housing. Handle valve body

with reasonable care so the o.d. of valve is not damaged. Button bleed valves (27) need not be removed except for replacement.

VALVE HOUSING ASSEMBLY

Replace all “0” rings with new ones. Lubricate “0” rings (15) with 36460 lubricant and assemble to valve body - models 8255-A-( ) only. Assemble valve body to housing and assemble caps (12) with “0” rings (13), to housing. If check valve(s) (17) have been removed, assemble “0" ring(s) (16) to valve(s) and assemble valve(s) to housing. Assemble spring(s) (18) to housing. Assemble “0” ring (20) to screw plug (21) and assemble to housing. Assemble screw plug (19) to housing - models 8255A-( ) only Assemble outer sleeve and components to housing as described in air piston assembly section. Assemble “0” rings (23) to needle valves (24) and assemble needle valves to housing. Assemble plate (25) to housing, securing with screws (26).

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