Cherry Gh-702a User manual

Lightweight Power Tool

GH-702A

MAINTENANCE MANUAL

1224 East Warner Ave,

Santa Ana, Ca 92705

Tel: 1-714-545-5511

Fax: 1-714-850-6093

www.cherryaerospace.com

THE GH-702A TOOL

TABLE OF CONTENTS

Description ...........................................................................................................................................1

Specifications For GH-702A ...................................................................................................................................................1

Safety Warnings ......................................................................................................................................................................2

How To Use The GH-702A .................................................................................................................3

Maintenance And Repair ........................................................................................................................................................3

Fill And Bleed Instructions ...................................................................................................................4

Trouble Shooting .................................................................................................................................4

Overhaul ...............................................................................................................................................5

Air Valve .....................................................................................................................................................................5

Head Sub-Assembly ..................................................................................................................................................5

Handle Sub-Assembly ...............................................................................................................................................6

Pulling Heads .......................................................................................................................................6

Installing Pulling Heads .............................................................................................................................................7

Cross Section Drawing Of GH-702A ......................................................................................................................................8

Parts List For GH-702A Riveter ..........................................................................................................9

Exploded View Of GH-702A .................................................................................................................................................10

Declaration Of Conformity ......................................................................................................................................Back Cover

DESCRIPTION

The Cherry GH-702A is a pneumatic-hydraulic tool designed

specifically for the most efficient installation of

commercial fasteners. Its durable, all metal housing makes

this extremely robust tool ideal for use in rugged shop

environments. It has many ergonomic features: very light

weight, comfortable fit in the operator's hand and it can be

operated in any position with one hand.

SPECIFICATIONS FOR GH-702A

Cherry Aerospace's policy is one of continuous

development. Specifications shown in this document

may be subject to change which may be introduced

after publication. For the latest information always

consult Cherry Aerospace.

IR PRESSURE 90 PSI (6.2 bar) Min. / 110 PSI (7.6 bar) Max.

STROKE .75 inch (19 mm)

PULLING FORCE 1100 Pounds (4.9 kN) @ 90 PSI (6.2 bar)

CYCLE TIME Approximately One Second

WEIGHT 3.5 Pounds (1.59 kg)

NOISE LEVEL 65 dB (A)

VIBRATION less than 2.5 m/s2

IR CONSUMPTION .066 SCF/cycle (1.87 L/cycle)

The GH-702A comes equipped with

nosepiece 728A9-4, included for

setting:

N Rivets - 1 /8” diameter

Q Rivets - 1 /8” diameter

Cherrymate® Rivets- 3/16” diameter

There is also a spare nosepiece

728A9-6 to set:

N Rivets - 3/16” diamete

Q Rivets - 3/16” diamete

Cherrymate® Rivets - 1 /4” diamete

SAFETY WARNINGS

Operating this tool with a damaged or missing stem deflector, or using the deflector as a handle, may

result in severe personal injury. The pin deflector should be rotated until the aperture is facing away

from the operator and other persons working in the vicinity.

Approved eye protection should be worn when operating, repairing, or overhauling this tool.

Do not use beyond the design intent.

Do not use substitute components for repair.

Any modification to the tool, pulling heads, accessories or any component supplied by Cherry Aerospace,

or their representatives, shall be the customer's entire responsibility. Cherry Aerospace will be pleased

to advise on any proposed modification.

The tool must be maintained in a safe working condition at all times and examined at regular intervals for

damage.

Before disassembling the tool for repair, refer to the maintenance instructions. All repairs shall be

undertaken only by personnel trained in Cherry Aerospace installation tools. Contact Cherry Aerospace

with your training requirement.

Always disconnect the air line from the tool inlet before attempting to service, adjust, fit or remove any

accessory.

Do not operate the tool when it is directed at any person.

Ensure that the vent holes do not become blocked or covered and that air line hoses are always in good

condition.

Excessive contact with the hydraulic oil should be avoided to minimize the possibility of rashes. Care should be taken to

wash thoroughly.

Operating air pressure should not exceed 110 psi (7.6 bar).

Do not operate the tool without the pulling head in place.

Do not operate the tool unless the handle base (25) is fully secured by the retaining rings (26) and (28) and

base cover (27).

All retaining rings, screwed end caps, air fittings, trigger valves and pulling heads should be attached

securely and examined at the end of each working shift.

Do not pull rivet in the air.

The precautions to be used when using this tool must be explained by the customer to all operators. Any questions regarding

the correct operation of the tool and operator safety should be directed to Cherry Aerospace.

Do not pound on the rear of the tool head to force rivets into holes as this will damage the tool.

Do not depress the trigger while disconnecting the air bleeder and replacing the cap screw when bleeding the tool.

HOW TO USE THE GH-702A

After selecting the proper pulling head and attaching it securely to the GH-702A, connect the air line to the tool. Insert the rivet

stem into the pulling head until the head of the rivet is in contact with the pulling head sleeve. This will ensure full engagement

between the jaws and the rivet stem and will prevent slippage.

Once the rivet stem is inserted in the pulling head, the rivet must be installed. Insert the rivet into the application and pull the

trigger to activate the tool. Upon the release of the trigger, the stem will eject to the rear of the tool.

MAINTENANCE AND REPAIR

The GH-702A has been manufactured to give maximum service with minimum care. In order that this may be accomplished, the

following recommendations should be followed:

1. The hydraulic system should be full of oil and free from air at all times.

2. Keep excessive moisture and dirt out of air supply to prevent wear of air valve, air cylinder and air piston.

3. Tool should be routinely inspected for oil leaks.

Use automatic transmission fluid Type "A" (no substitutes). Cherry Aerospace recommends using ATF, Dexron III oil.

DEXRON III OIL SAFETY DATA

FIRST AID

Skin: Wash thoroughly with soap and water as soon as possible. Casual contact requires no immediate attention. If

irritation develops, consult a physician.

Ingestion: Seek medical attention immediately. DO NOT INDUCE VOMITING.

Eyes: Flush with copious amounts of water. If irritation develops, consult a physician.

Inhalation: No significant adverse health effects are expected to occur on short term exposure. Remove from contaminated area.

Apply artificial respiration if needed. If unconscious, consult physician.

FIRE

Suitable extinguishing media: CO2, dry powder, foam or water fog. DO NOT use water jets.

ENVIRONMENT

Waste Disposal: In accordance with local, state and federal regulations.

Spillage: Prevent entry into drains, sewers and water courses. Soak up with diatomaceous earth or other inert material. Store in

appropriate container for disposal.

HANDLING

Eye protection required. Protective gloves recommended. Chemically resistant boots and apron recommended. Use in well ventilated area.

COMBUSTIBILITY

Slightly combustible when heated above flash point. Will release flammable vapor which can burn in open or be explosive in

confined spaces if exposed to source of ignition.

STORAGE

Avoid storage near open flame or other sources of ignition.

PROPERTIES

Specific gravity 0.863

Weight per gallon 7.18 lbs.

FILL AND BLEED INSTRUCTIONS

To replace a small amount of oil in the tool, remove cap screw (15), attach the Cherry air bleeder (700A77), connect the tool to the

air line and cycle several times. This will ensure the removal of any air from the hydraulic system and its replacement with fluid.

Should it become necessary to completely refill the tool (such as would be required after the tool has been dismantled and re-

assembled), take the following steps:

1. Remove head assembly (1) from handle (32) by

unscrewing cap screws (50).

2. Fill handle assembly (32) with the recommended oil to

within 1/8" (3.175mm) of the top of the handle casting.

3. Place head assembly (1) on handle (32), being sure

gasket (49), and 0-ring (48), are properly in place.

Tighten cap screws (50) uniformly to prevent leakage

around gasket.

4. Remove cap screw (15) and attach the Cherry air

bleeder (700A77). Connect the tool to the air line and

cycle a number of times. This will ensure the removal of

any air from its hydraulic system and its replacement

with fluid.

TROUBLESHOOTING

1. Check the air line for correct pressure at the tool. It

must be 90 to 110 psi (6.2 to 7.6 bar).

2. Check the tool for lack of oil (see Fill and Bleed

instructions).

3. Check for oil leakage:

Oil leaking around the cap screw (15) in the head

indicates that the screw is loose or the Stat-O-Seal

(14) needs replacing.

If oil should leak through the by-pass hole at the

base of

the handle (32) the 0-rings (34) are worn or

damaged.

Oil leaking from the front of the head (1) indicates

that 0-rings (2) are worn or damaged.

4. Check for excessive air leakage from the air valve:

If spring (39) is broken or dislodged, air will

bleed directly through the bottom of the air valve

and the head piston retreats to its full stroke

without returning. See air valve instructions on

page 5.

If 0-ring (44) on plug (45) is worn or damaged,

replace.

If 0-rings (36) on valve spool (41) are worn

or damaged, replace.

5. Check movement of the head piston (4). If it does not

move freely or is slow in operation:

0-rings (2), (5), (7) and (8) may be damaged and

require replacement.

Head piston (4) may be mechanically locked

due to damaged parts.

The 0-ring (36) on power piston rod (37)

may be damaged; replace.

Muffler (46) or air filter (42) inside valve spool (41)

may be plugged with dirt. Clean them thoroughly

with normal solvent and back-blow with compressed

air.

Hole in metering screw (43) in valve spool (41)

may be blocked or damaged. Hole diameter should

be .028" (.711 mm). Clear and size or replace

valve spool assembly (40).

6. Rivet stem sticks in the pulling head:

Pulling head components need maintenance.

Disassemble the pulling head, clean and replace

worn parts. Re-assemble following instructions on

page 7.

Spent rivet stems are wedged side by side in the

pulling head. Disassemble the pulling head, remove

stems and re-assemble following the instructions on

page 7.

(15)

OVERHAUL THE G701/G704KT TOOL KIT

AIR VALVE

Remove retaining ring (47) and muffler (46). Insert a valve plug extractor (P1178) into end of valve plug (45) and pull it out.

Using the same procedures, pull out valve spool sub-assembly (40).

Use needle nose pliers to grasp the end of the spring (39), turn clockwise and pull out to dislodge from groove in handle.

With spring removed, valve sleeve (38) can be pulled out using the valve sleeve removal tool (837B700).

To re-assemble, reverse the above procedures, being certain that all 0-rings are properly lubricated. To avoid damaging the

0-rings (2), carefully install sleeve (38) with your finger. Gently push and wiggle sleeve to allow 0-rings to slip past inner ports.

Spring (39) is best installed using a valve spring installation tool (836B700) to push the large diameter coil into the groove. This

requires care as the tool will not operate if the spring is not anchored firmly.

HEAD SUB-ASSEMBLY

Disconnect the air supply and remove the complete pulling head from the tool before attempting to disassemble the

head assembly.

Remove the four socket head cap screws (50). Lift head assembly from the handle (32). Remove 0-ring (48) and gasket

(49). Empty the oil into a container by pouring from the handle. Dispose of the oil according to environmental regulations.

Remove end cap (10). Push against threaded end of head piston (4) and slide it out of head cylinder (1). Be careful not to

damage threads or cause burrs on polished head piston rod surface.

0-rings (2) and back-up ring (3) can now be removed using a bent hook. 0-ring (8) can be removed in the same manner.

Upon re-assembly, be sure to install 0-rings and back-up rings carefully to avoid cutting them. Always lubricate all 0-rings.

Just prior to placing the head sub-assembly onto the handle, see Fill and Bleed Instructions. Also make sure to place 0-ring

(48) on top of the handle in its groove, and then the gasket (49) over the 0-ring (48).

Tighten the four socket head cap screws (50) uniformly to prevent leakage around the gasket.

Purge system of air using Cherry air bleeder (700A77) according to Fill & Bleed Instructions.

The disassembly and re-assembly proce-

dures can be accomplished by following

the instructions below and the drawings on

pages 8 & 10. Use extreme care during

disassembly and re-assembly not

to mar, nick or burr any smooth

surface that comes in contact with

0-rings. Before installing 0-rings, be

sure to apply an 0-ring lubricant. It is

recommended that special assembly

tools, which can be ordered under part

number G7O1/G7O4KT, be used to

overhaul this tool. Service kit, G7O2AKS,

which contains a complete set of 0-rings,

back-up rings, screws, washers and

gaskets should be ordered.

Not shown, but included: 701A67 Sea

Guide, 702862 Power Cylinder Tool,

703A53 Seal Guide, 702A64 Seal Guide.

700477

Air Bleeder

700A460

Seal Guide

700A

Piston Rod Wrench

1178

Valve Plug Extractor

700

Power Cylinder Tool

700B65

Packing Plug Wrench

8375700

Valve Sleeve Removal Tool

836B700

Valve Spring Installation Tool

HANDLE SUB-ASSEMBLY

Disconnect tool from air supply and remove parts (25) through (29).

Remove the head sub-assembly using the instructions in the head sub-assembly section.

Place piston rod wrench (700A61) down into the top of the handle (32), into the hex socket in the head of the power piston

rod (37). While holding this wrench, remove the locknut (24) using the 7/16" socket in packing plug wrench (700B65).

Still holding the piston rod wrench, remove the air piston (22) using the packing plug wrench (700B65) by turning

counterclockwise. When air piston (22) is completely freed from the piston rod, tap or push on the piston rod wrench to eject

the piston from bottom of handle.

Slide power piston rod (37) back up to the end of its travel. Using the packing plug wrench (700B65), remove

packing plug (19). It may be necessary to hold the handle upside down in a vise while removing the packing plug.

Power cylinder (33) can be tapped out by lowering power cylinder tool (700A62) down into the top of the handle on to top of

cylinder. The 0-rings (16) and backup rings (17) are best removed and replaced by using a thin bent hook.

To re-assemble the handle, reverse the above procedure, being certain that all the 0-rings are properly lubricated before installa-

tion. Attach the seal guide (700A60) to the piston rod (37) and with a mallet, tap the piston rod through the packing plug (19).

When re-assembling a replacement air piston, items (20) through (23), follow the instructions given below:

Clamp piston rod wrench (700A61) in a vise with the hex shaft pointed up.

Turn the handle upside down and place the hex end of the power piston rod (37) onto the wrench. Push handle casting down

until it stops.

Assemble 0-ring (20) to air piston (22).

Place large washer (21) over the threaded end of the power piston rod (37).

Place the air piston (22) into handle bore. IMPORTANT: Be sure that the radial pattern embossed on the side of air piston

is facing downward towards the large washer (21) and the smooth side of the air piston is facing you.

Place the small washer (23) over the threaded end of the power piston rod (37). Thread the locknut (24) onto the power

piston rod (37) and tighten between 50 in.-lb (5.65 N-m) and 59 in.-lb (6.67 N-m).

INSTALLING H702 PULLING HEAD ON RIVETER

1. Connect tool to air supply and without

depressing trigger, place spring (G) over

tube (F) as shown and insert as far as

possible into head piston (4).

2. Place jaws (E) inside collet (D) and screw

this assembly onto end of head piston (4).

Tighten snugly, using wrenches on the flats

provided. NOTE: Make sure tapered end of

tube (F) is aligned properly in bevel in back

end of jaws (E).

3. Thread nose piece (A) completely into

sleeve (B) and place this assembly over the

collet and jaw assembly. Screw sleeve (B)

into end of tool head (1) while depressing

trigger and tighten snugly.

4. Tighten jam nut (C) securely.

5. These pulling heads will give long life if

properly maintained. This includes keeping

the head clean and dry and all the parts

securely tightened. The only lubrication

required is a little Lubriplate inside the cone

of the collet to assure a sliding action

against the back of the jaws.

6. In case of damage or wear to pulling head

parts, dismantle and replace with parts

selected from the list below.

RI VET

RIV ET

CherryMate

RIVET

728A9-3Z 3/32 ALL

—

728A9-4 1/8 ALL ALL —

728A9-104 5/32 AAP,BSP,

SSP AAA,BSP,

SSP —

728A9-4 3/16 ——ALL

728A9-6 AAP, BSP AAP —

728A9-6 1/4 — — BALM,

BSLM

B1702B19

C1671A16

D1702A20

E1 SET 728B4

F1743A8-8Z

G1732A8

COMMERCIAL FASTENER TYPE

PART

NUMBER

JAM NUT

COLLET

REF. NO. QTY.

REQ.

RI VET

DIAM.

ASEE CHART

AT RIGHT

JAW SPRING

JAWS (2 PIECE)

JAW FOLLOWER

SLEEVE

CROSS SECTION OF GH-702A

PART LIST FOR THE GH-702A RIVETER ASSEMBLY

"Not furnished with riveter. Must be ordered separately if desired.

**No substitutions.

***These parts can not be ordered separately, but must be ordered as a sub-assembly.

All dimensions are in inches.

QTY.

10 1

11 1

12 1

13 1

14 1

15 1

16 2

17 2

18 1

19 1

20 1

21 1

22 1

23 1

24 1

25 1

26 1

27 1

28 1

29 1

30 1

31 P-223 O-RING (.285, .145, .070) 1

32 1

33 1

34 2

35 1

36 4

37 1

38 1

39 1

40 1

41 SPOOL, VALVE*** 1

42 FILTER*** 1

43 SCREW, METERING*** 1

44 2

45 1

46 1

47 1

48 1

49 1

50 4

51 ASSEMBLY, MANDREL CATCHER BAG* 1

52 1

702-054 (G702A RIVER ASSEMBLY)

702B15 SUB-ASSEMBLY, HEAD

702C2 SUB -ASSEMBLY, HEAD CYCLINDER

P-653 O-RING (.691, .551, .070)

P-883 RING, BACK-UP (.686, .580, .053)

702B16 PISTON, HEAD

P-216 RING, QUAD (.880, .674, .103)

P-209 RING, BACK-UP (.864, .688, .088)

P-654 O-RING (.879, .739, .070)

P-112 0-RING (.504, .364, .070)

P-848 O-RING (.941, .801..070)

702B17 CAP

P-880 RING, RETAINING (NON-STANDARD)

703A13 FITTING, DEFLECTOR

530A16 DEFLECTOR, PIN

P-572 STAT-O-SEAL (.430, .180, .125)

P-573 SCREW, BUTTON HEAD SOC., 10-32 X 1/4

702-053 SUB-ASSEMBLY, HANDLE

P-838 O-RING (.568, .362_1 03)**

P-115 RING, BACK-UP (.551, .375, .088)

P-727 O-RING (1.318, 1.112, .103)

700B93 PLUG, PACKING

P-893 O-RING (2.387, 2.109, .139)

700A21 WASHER

747-013 PISTON, AIR

P-1387 WASHER, STEEL

P-737 NUT, CONEL K, 1/4-20

747-015 BASE, HANDLE

P-894 O-RING (2.254, 2.114, .070)

P-895 RING, RETAINING (INT. Ø 2.440)

P-1386 RING, RETAINING (EXT. Ø 2.062)

747-011 COVER, URETHANE BASE

703A33 SUB-ASSEMBLY, TRIGGER

747-018 HANDLE

747-019 CYLINDER, POWER

P-833 O-RING, DISOGRIN (1.068, .862, .103)

P-919 RING, BACK-UP (.528, .422, .053)

P-829 O-RING, DISOGRIN (.504, .364, .070)**

747-017 PISTON, POWER

700B73 SLEEVE, VALVE

700A67 SPRING

700A15 SUB-ASSEMBLY, VALVE SPOOL

700D15-2

700A18

700A69

P-834 O-RING (.816 .676, .070)**

700A16 PLUG, VALVE

GASKET

700A17 MUFFLER

P-279 RING, RETAINING (INT. Ø .906)

HOSE

PART NO. DESCRIPTION

670-037-1

P-948

P-27 SCREW, SOC. HD. CAP, 8/32 X 1/2

P-832 O-RING (.379, .239, .070)**

702A22

EXPLODED VIEW OF GH-702A

1224 East Warner Ave,

Santa Ana, Ca 92705

Tel: 1-714-545-5511

Fax: 1-714-850-6093

www.cherryaerospace.com

For more information

lease contact our Technical Services De

artment at Tel. 714-850-6022

Seller warrants the goods conform to applicable specifications and drawings and will be manufactured and inspected according to generally accepted practices of

companies manufacturing industrial or aerospace fasteners. In the event of any breach of the foregoing warranty, Buyer’s sole remedy shall be to return defective

goods (after receiving authorization from Seller) for replacement or refund of the purchase price, at the Seller’s option. Seller agrees to any freight costs in

connection with the return of any defective goods, but any costs relating to removal of the defective or nonconforming goods or installation of replacement goods

shall be Buyer’s responsibility. SELLER’S WARRANTY DOES NOT APPLY WHEN ANY PHYSICAL OR CHEMICAL CHANGE IN THE FORM OF THE

PRODUCT IS MADE BY BUYER.

THE FOREGOING EXPRESS WARRANTY AND REMEDY ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES AND REMEDIES;

ANY IMPLIED WARRANTY AS TO QUALITY, FITNESS FOR PURPOSE, OR MERCHANTABILITY IS HEREBY SPECIFICALLY DISCLAIMED AND

EXCLUDED BY SELLER. THIS WARRANTY IS VOID IF SELLER IS NOT NOTIFIED IN WRITING OF ANY REJECTION OF THE GOODS WITHIN ONE

(1) YEAR AFTER INITIAL USE BY BUYER OF ANY POWER RIVETER OR NINETY (90) DAYS AFTER INITIAL USE OF ANY OTHER PRODUCT.

Seller shall not be liable under any circumstances for incidental, special or consequential damages arising in whole or in part from any breach by Seller, AND SUCH

INCIDENTAL

SPECIAL

OR CONSE

UENTIAL DAMAGES ARE HEREBY EXPRESSLY EXCLUDED.