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MODEL NR 83AA3 Hitachi Power Tools TECHNICAL DATA STRIP NAILER NR 83AA3 SERVICE MANUAL LIST No. E009 Jul. 2003 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
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REMARK: Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(are) used in the place of company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here is(are) as follows: Competitors Symbols Utilized Company Name Model Name FP650 SENCO PASLODE F350S...
10-3. Disassembly and Reassembly of the Control Valve Section ............30 10-4. Disassembly and Reassembly of the Driving Section, the Cap and the Magazine Section ..32 11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ..........36 12. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............37 Assembly Diagram for NR 83AA3...
2. MARKETING OBJECTIVE The new Model NR 83AA3 strip nailer is a minor-changed version of the current Model NR 83AA2. Owing to the modification of the ANSI standard, the current Model NR 83AA2 has gone out of production since the 1st of May 2003.
5-2. Explanation of the Nailing Operation To meet the requirements of "ANSI SNT-101-2002", the Model NR 83AA3 is equipped with a nailing operation switching device as shown in the figures below. Use SINGLE ACTUATION MECHANISM (SINGLE SEQUENTIAL ACTUATION MECHANISM) or CONTACT ACTUATION MECHANISM in accordance with the work to be performed.
NR 83AA2. CAUTION: Ensure that nails are as specified in Fig. 1. The Model NR 83AA3 utilizes D-head (clipped head) nails collated at an angle of 34 degrees which are the same as the nails utilized by a competitor's model Paslode. However, some D-head nails made by other makers are collated at a different angle of 26 degrees.
For example, when driving a nail of 3.3 mm dia. by 83 mm length (0.131" x 3-1/4") into nine sheets of 12 mm plywood (108 mm thick ) with the Model NR 83AA3, a pressure of about 7.0 bar (7.1 kgf/cm , 102 psi) allows the nailer to drive the nail flush with the wood surface.
A full sequential actuation mechanism kit (sequential trip mechanism kit) is provided as an optional accessory for the Model NR 83AA3. By using this optional accessory, a nail is driven by pressing the push lever first against a workpiece and then pulling the trigger (single-shot operation), and no nail is driven when pulling the trigger first and then pressing the push lever against a workpiece.
7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model NR 83AA3 Nailer by all of our customers, it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Instruction Manual, and fully understands the meaning of the precautions listed on the Warning Label attached to each tool.
7-3. Related Laws and Regulations As nailers and staplers are designed to instantaneously drive nails and staples, there is an ever-present danger of misfiring and subsequent possible serious injury. Accordingly, close attention in handling is absolutely necessary at all times. Carefully ensure that the customer is fully aware of the precautions listed in the Instruction Manual provided with each unit.
The basic construction of the Model NR 83AA3 is the same as that of the Model NR 83AA2. The magazine section is common to that of the Model NR 83AA2. However, most of the parts of the control valve section were newly designed to provide the single actuation (single sequential actuation)/contact actuation mechanisms in order to correspond to the modification of the ANSI standard.
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The <Bold> numbers in the figure below correspond to the numbers in "8-3. Operation Principle". Safety valve portion Trigger valve portion Trigger Switching device (Valve sleeve (A)) Valve bushing Plunger (B) Exhaust Valve < 2 > Control valve section Exhaust cover Exhaust Vent <...
Model NR 83AA2 are described in detail. (1) Output section Be careful not to make mistakes in mounting the following parts that were changed for the Model NR 83AA3 because these parts are similar to those of the Model NR 83AA2 but not interchangeable.
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(3) Control valve section Be careful not to make mistakes in mounting the following parts that were changed for the Model NR 83AA3 because these parts are similar to those of the Model NR 83AA2 but not interchangeable. Part NR 83AA3...
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Parts that were changed for the Model NR 83AA3 and not interchangeable with the Model NR 83AA2 (except the parts described in Part NR 83AA3 NR 83AA2 Caution Valve Bushing [49] These parts were newly designed to provide the single actuation (single sequential actuation)/contact actuation selector.
8-3. Operation Principle The operation of the Model NR 83AA3 is illustrated and described in Fig. 4 through 7. The circled numbers in the descriptions correspond to the item numbers shown in the mechanism illustrated in Fig. 3. In Fig. 5 and Fig. 7, read the descriptions in alphabetical order.
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Compressed air is applied Although air pressure is applied to both the to the upper side of the upper and lower sides of the cylinder, the Exhaust Valve < 2 >, forcing cylinder is forced downward due to the larger it downward and closing Cylinder ring effective area of the upper side.
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Air pressure is applied in the shaded areas in the illustration, and each component is held in the position illustrated. If the operator's grip is loosened, air will leak. As there is no o-ring installed here, a very small amount of air will leak from the slight clearance between the components.
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The air pressure on the upper surface of the Exhaust Valve < 2 > is released, and the exhaust valve is pushed upward by the air pressure within the cylinder. This opens the Exhaust Vent < 3 >, and the air pressure in the cylinder is discharged from the nailer.
9. TROUBLESHOOTING GUIDE 9-1. Troubleshooting and Correction Problem Possible cause Inspection method Remedy 1) Nails cannot <Nails> be driven. Use specified nails. Magazine is not loaded with Check if the magazine is Remove the abnormal nails specified genuine nails. normally loaded with and load the magazine with specified nails.
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Problem Remedy Possible cause Inspection method <Output section> Adjust for 5 to 8.5 kgf/cm Set the single actuation/ Air pressure is too low. Replace the piston ring. contact actuation selector to the contact actuation. Piston O-ring is worn or Pull the nail feeder damaged.
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Problem Inspection method Remedy Possible cause 3) Head of a nail Air pressure is too low. Drive a nail into soft wood Adjust for 5 to 8.5 kgf/cm driven into a Workpiece is very hard. workpiece and check if the Do not use unspecified workpiece head protrudes from the...
9-2. Regrinding the Driver Blade The tip of the driver blade should be ground as shown in Fig. 8. To grind with a grinder, gradually grind the tip while cooling the ground area with water to prevent it from being excessively heated. Excessive grinding will rapidly reduce the service life of the driver blade.
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Inspection priorities: In the table below, possible causes of air leakage and their repair procedures are marked in accordance with the likelihood of possible failure. (1) First priority items are marked with an asterisk ( ). (2) Second priority items (seal portions) are marked with a double circle ( (3) Remaining items are marked with a single circle ( ).
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Cause Air leak part When trigger valve ON/ When trigger valve/ When trigger valve/safety valve are OFF safety valve are ON safety valve OFF Scratched or damaged O-ring [53] inside Valve Safety valve Sleeve (A) [54] (When (continued) single actuation is selected) Loose Hex.
(MULTEMP PS No. 2 Code No. 939301) must be applied to the O-rings and the sliding portions of the control valve section. Do not scratch the O-rings nor adhere dust to them when mounting. Oil required: Hitachi pneumatic tool lubricant 1 oz (30 cc) oil feeder (Code No. 877153) 4 oz (120 cc) oil feeder (Code No.
10-2. Disassembly and Reassembly of the Output Section (1) Piston [12], Cylinder [17] and related parts Tool required: Hexagonal bar wrench (5 mm) (a) Disassembly (See Figs. 9, 10 and 11.) Remove the four Hex. Socket Hd. Bolts (W/Sp. Washer) M6 x 25 [3], and take off the Exhaust Cover [4]. The Piston [12] can then be taken out.
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Head Cap and Gasket Set [10] Gasket (C) [8] and Gasket (F) [6] should be replaced with new genuine Hitachi parts. Fig. 12 Disassembly of main body, upper part Apply the designated grease to the outer circumference of the Exhaust Valve [9] prior to reassembly.
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Exhaust Valve [9] 1 mm dia. hole Cross-sectional view Fig. 13 (3) Piston Bumper (B) [27], Gasket (A) [28] and related parts (See Figs. 14 and 15.) Tools required Hexagonal bar wrench (5 mm, 6 mm) Roll pin puller (3 mm (0.118") dia.) Screwdriver (a) Disassembly Pull out the Roll Pin D3 x 45 [43] to remove Guard (B) [42].
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Guard (B) [42] Roll Pin D3 x 45 [43] Body Ass'y [25] Plunger (B) Spring [58] Plunger (B) [59] Nylock Bolt (W/Flange) Piston Bumper (B) [27] M8 x 16 [33] Gasket (A) [28] Nylock Bolt (W/Flange) M6 x 12 [29] Guard [30] Nylock Hex.
10-3. Disassembly and Reassembly of the Control Valve Section Tools required: Roll pin puller (3 mm (0.118") dia.) Flat-blade screwdriver Setting pin (with a rounded tip) (a) Disassembly (See Fig. 16.) Remove the Magazine [78] as described in section 10-2-(3). Remove the Pushing Lever [45] as described in section 10-2-(3).
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(b) Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse. However, special attention should be given to the following items. Plunger Spring [46] and Plunger (B) Spring [58] are small and apt to be twisted and lost. Be careful when handling them.
10-4. Disassembly and Reassembly of the Driving Section, the Cap and the Magazine Section (1) Nose [32], Pushing Lever [45] and the related parts (See Fig. 19.) Tool required Hexagonal bar wrench (5 mm) (a) Disassembly Perform disassembly according to 10-2-(3) to remove the Nose [32], Pushing Lever [45] and the other parts.
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(2) Magazine [78], Nail Feeder Ass'y [75] and the related parts (See Fig. 20.) Tool required Hexagonal bar wrench (5 mm ) (a) Disassembly Perform disassembly according to 10-2-(3) to remove the entire magazine section. Remove a screwdriver or a rod from the stopper hole for the Nail Feeder Ass'y [75]. Then the Nail Feeder Ass'y [75], Ribbon Spring [76] and Needle Roller D4 x 20 [77] can be removed from the front of the Magazine [78].
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(3) Nail Feeders (A) [71], (B) [73] and the related parts (See Fig. 21.) Tool required Roll pin puller (4 mm (0.157") dia.) (a) Disassembly Fix the Nail Feeder Ass'y [75] using a V-block and pull out the Roll Pin D4 x 40 [72] from the top using a roll pin puller (4 mm (0.157") dia.).
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(4) Disassembly and reassembly of the cap (See Fig. 22.) Tool required Hexagonal bar wrench (4 mm) Cap [38] Gasket (D) [37] Hex. Socket Hd. Bolt M5 x 18 [39] Body Ass'y [25] Fig. 22 (a) Disassembly Remove the three Hex. Socket Hd. Bolts M5 x 18 [39], the Cap [38] and Gasket (D) [37] can be removed. (b) Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse.
Feeder Ass'y [75] moves smoothly in the Magazine [78]. (2) Connect the Model NR 83AA3 to an air compressor and set Valve Sleeve (A) [54] to "single actuation (single sequential actuation)" (see 5-2). Check the following when the pressure is 4.5 kgf/cm (63 psi) and 8.5 kgf/cm (120 psi).
12. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow NR 83AA3 Exhaust Cover Exhaust Piece Nose Exhaust Valve Magazine Head Cap and Nail Rail Gasket Set Nail Feeder Gasket x 4 Ass'y Ribbon Spring General Assembly...