The G746A CherryMAX® Power Riveter is a pneumatic-hydraulic tool designed for the efficient installation of CherryMAX® Bulb, CherryMAX® "A" wire draw, and CherryLOCK® "A" wire draw rivets. This riveter utilizes the straight, offset, and right-angle pulling heads to correctly pull the rivet part number for the rivet to be installed. The G746A has a durable metal housing, making it extremely robust for shop use.
Technical Specifications:
- Air Pressure: 90 psi (6.2 bar) Min. / 110 psi (7.6 bar) Max.
- Stroke: .875 inch (22.23 mm)
- Pulling Force: 1850 pounds (8.23 kN) @ 90 PSI (6.2 bar)
- Cycle Time: Approximately one second
- Weight: 4 1/4 Pounds (1.93 kg)
- Noise Level: 72 dB(A)
- Vibration: <2.5 m/s²
- Air Consumption: 3.9 CFM (110.5 liters/M) at 20 Cycles per Minute
- Dimensions: 3/4" (19.05 mm) diameter, 2-1/8" (53.97 mm) width, 11" (279.46 mm) height, 4-15/16" (125.41 mm) length.
Usage Features:
The G746A is designed for ease of use and versatility. To select the proper pulling head and attach it securely to the riveter, connect the tool to an air line. Recommended air pressure is between 90 and 110 psi. Insert the rivet stem into the pulling head until the head of the rivet is in contact with the nosepiece. This will ensure full engagement between the jaws and the rivet stem and preventing slippage.
To insert the rivet into the application and depress the trigger to activate the tool, pull the release of the trigger. The stem will eject to the rear of the tool when straight pulling heads with no side eject feature are used. Other pulling heads (offset, right angle) will either captivate the stem or allow stem removal through the front only. See the appropriate tooling sheet for the selected pulling head.
The tool requires a small amount of oil in the tool, connect the tool to the air line, remove cap screw (15) (CAUTION: Do not depress trigger without cap screw or air bleeder attached.) Attach the Cherry air bleeder (700A77), and slowly cycle tool several times. This will ensure the removal of any air from the hydraulic system and its replacement with fluid.
Troubleshooting:
- Incorrect air pressure: If the tool does not operate correctly, ensure the air pressure is between 90 and 110 PSI (6.2 to 7.6 bar).
- Oil leakage:
- Oil leaking around the cap screw (15) indicates that the screw is loose or the washer gasket (14) needs replacing.
- Oil should leak through the by-pass hole at the base of the handle (18) if the O-rings (30) are worn or damaged.
- Oil leaking from the front of the head (1) indicates that O-rings (2) are worn or damaged.
- Excessive air leakage from the air valve:
- If spring (20) is broken or damaged, air will bleed directly through the bottom of the air valve and the head piston retreats to its full stroke without returning. Refer to "Air Valve Instructions."
- If the O-rings (29) on plug (26) is worn or damaged, replace it. O-rings (21) on valve spool (22) are worn or damaged, replace.
- Slow movement of the head piston:
- O-rings (56), (7), (8) and (9) may be damaged and require replacement.
- Head piston (4) may be mechanically locked due to damaged parts.
- Muffler (27) or air filter (23) inside valve spool (22) may be plugged with dirt. Clean them thoroughly with normal solvent and back-blow with compressed air.
- Hole in metering screw (24) in valve spool (22) may be blocked or damaged. Hole diameter should be .028" (0.7 mm). Clear and size or replace valve spool assembly (54). Metering screw (24) and filter (23) are not sold separately.
- Rivet stem stick inside the pulling head, or stems slip during installation: If the rivet stem sticks or slips, the pulling head needs maintenance. Refer to the Tool Sheet of the pulling head for details.
Maintenance and Repair:
The G746A has been manufactured to give maximum service with minimum care. For optimal performance, the following recommendations should be followed:
- The hydraulic system should be full of oil and free from air at all times.
- Keep excessive moisture and dirt out of air supply to prevent wear of air valve, air cylinder and air piston.
- Tool should be routinely inspected for oil leaks.
- Use automatic transmission fluid Type "A" (no substitutes). Cherry® Aerospace recommends using Dexron® III ATF.
Dexron® III ATF Properties:
- Specific gravity: 0.883
- Weight per gallon: 7.38 lbs.
- Open flash point: >200°C (392°F)
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: Use only suitable extinguishing media like 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. Handle more spilled fluid in an appropriate container for disposal.
- Handling: Store in a cool, well-ventilated area. It is recommended to wear protective gloves and chemically resistant boots and apron while working with the fluid. Use in well-ventilated area.
- Combustibility: It is slightly combustible when heated above flash point. It 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.
Overhaul:
Always disconnect the air supply before any overhaul or maintenance. The disassembly and reassembly procedures can be accomplished by following the instructions below and the exploded view on page 10. Use extreme care during disassembly and reassembly not to nick, pick or burr any smooth surface that comes in contact with O-rings. Before installing O-rings, be sure to apply an O-ring lubricant. It is recommended that special assembly tools, which can be ordered under part number G701/G704KT, be used to overhaul this tool. Service kit G746KS, which contains a complete set of O-rings, back-up rings, screws, washers and gaskets should be ordered.
Air Valve Maintenance:
- Disconnect tool from air supply. Remove retaining ring (25) and muffler (27). Insert a valve plug extractor (P-1178) into end of valve plug (26) and pull it out. Using the same procedures, pull out spool assembly (54).
- Use needle nose pliers to grasp the end of the spring (20), turn clockwise and pull out to dislodge from groove in handle.
- With spring removed, valve sleeve (19) can be pulled out using the valve sleeve removal tool (837B700).
To re-assemble, reverse the above procedures being certain that all O-rings are properly lubricated. To avoid damaging the O-rings (56), carefully install sleeves (19) with your finger. Center push and wiggle sleeve to allow O-rings to slip past inner ports. Spring (20) 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 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 (49). Lift head assembly from the handle (18). Remove O-ring (50) and gasket (51). 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 body (1). Be careful not to damage threads or cause burrs on polished head piston rod surface.
- O-rings (2) and back-up rings (3) can now be removed using a bent hook. O-ring (8) can be removed in the same manner.
- Upon re-assembly, be sure to install O-rings and back-up rings carefully to avoid cutting them. Always lubricate all O-rings. Just prior to placing the head sub-assembly on to the handle, see Fill and Bleed Instructions. Also make sure to place O-ring (50) and the gasket (51) on the top of the handle, and that they are properly oriented.
- Tighten the four socket-head cap screws (49) uniformly to prevent leakage around the gasket.
- Purge system of air using Cherry air bleeder (700A77) according to the "Fill and Bleed Instructions".
Handle Sub-Assembly:
- Disconnect tool from air supply. Remove four socket-head cap screws (49). Lift head assembly from handle (18) and set aside O-ring (50) and gasket (51). Empty all oil into a container by pouring from handle.
- Remove parts (44) through (48).
- Place piston rod wrench (700A61) down into the top of the handle (18), into the hex socket in the head of the power piston rod (33). While holding this wrench remove the locknut (43) using the 7/16" socket in packing plug wrench (700B65).
- Still holding the piston wrench, remove the air piston (41) using the packing plug wrench (700B65) by turning counterclockwise. When air piston is completely freed from the piston rod, tap or push on the piston rod wrench ejecting the piston from bottom of handle.
- Slide power piston rod (33) back up to end of its travel. Using the packing plug wrench (700B65), remove packing plug (35). It may be necessary to hold the handle upside down in a vise while removing the packing plug.
- Power cylinder (29) can be tapped out by lowering power cylinder tool (700A62) down into the top of the handle onto top of cylinder. The O-rings (36) and back-up rings (37) 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 O-rings are properly lubricated before installation. Attach the seal guide (700A60) to the piston rod (33) and with a mallet, tap the piston rod through the packing plug (35). When re-assembling a replacement air piston, items (38) through (42), 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 piston rod (33) onto the wrench (700A61).
- Push handle casting down until it stops.
- Assemble seal (39) and back-up rings (38) to air piston (41).
- Place small washer (40) over the threaded end of the piston rod (33) so the counterbore side will face the air piston.
- Place the air piston (41) into the handle bore. IMPORTANT: Be sure that the radial pattern embossed on the side of air piston is facing downward. Place small washer (40) on the smooth end of the air piston facing you.
- Place the large washer (42) over the threaded shaft with the counterbore side toward the air piston.
- Thread the locknut (43) onto the piston rod and tighten at 50 in.-lb and 59 in.-lb (5.65 N-m to 6.67 N-m) of torque.
G746A Pulling Heads:
Pulling Heads are not furnished with this riveter and must be ordered separately. Make certain the pulling head is kept clean - especially around the riveting end, as adhesives, chips, sealants, etc., will clog up the serrations of the pulling head and may cause slippage of the stem.
| Pulling Head |
Type |
Adapter |
Rivet |
Rivet Diameters |
Maximum Grip |
| H701 B-456 |
Straight |
- |
CherryMAX® Bulb CherryMAX® "A" InterMAX |
1/8, 5/32, 3/16¹ 1/8, 5/32, 3/16² 1/8, 5/32, 3/16³ |
-9¹ -9² -4³ |
| H753A-456 |
Right Angle |
- |
CherryMAX® Bulb CherryMAX® "A" InterMAX |
1/8, 5/32, 3/16¹ 1/8, 5/32, 3/16² 1/8, 5/32, 3/16³ |
-9¹ -9² -4³ |
| H781-456 |
Offset |
- |
CherryMAX® Bulb CherryMAX® "A" InterMAX |
1/8, 5/32, 3/16¹ 1/8, 5/32, 3/16² 1/8, 5/32, 3/16³ |
-9¹ -9² -4³ |
| H9015 |
Straight |
704A9 |
M5 |
3/32, 1/8, 5/32, 3/16 |
-4 |
| H955-3, -4, -5, -6 |
|
|
CherryLock® "A"⁴ |
3/32, 1/8, 5/32, 3/16 ¹ |
-9 ¹ |
¹ On the first stroke.
² Nominal size oversize.
³ No 2117 Aluminum, Alloy steel and Monel only.
⁴ When installing CherryLock "A" rivets, the proper diameter pulling head must be used.
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