Hitachi NT 65A3 Technical Data And Service Manual Download Page 28 | Manualshive

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10. DISASSEMBLY AND REASSEMBLY

The items particularly necessary for disassembly and reassembly are described below. The [Bold] numbers in

the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram.

[CAUTION]

Before disassembly or reassembly, be sure to disconnect the air hose from the nailer (with your finger

released from the trigger) to exhaust all the compressed air and remove all nails.

10-1. General Precautions in Disassembly and Reassembly

Apply grease (ATTOLUB No. 2 Code No. 317918) to the O-rings and the sliding portions. Note that another

grease (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. 874042)

1 quart (1 ltr) can (Code No. 876212)

If Gasket (B) [4] is damaged, replace it and check that no air is leaking.

Be especially careful to prevent the entry of foreign particles into the control valve section.

Tightening torque for each part

Screw

Tightening torque

Nylock Hex. Socket Hd. Bolt M5

Hex. Socket Hd. Bolt M5

Nylock Hex. Socket Hd. Bolt (W/Flange) M5

Hex. Socket Hd. Bolt (W/Flange) M5

85 5 kgf

•

cm

(8.3 0.5 N

•

m, 6.1 0.4 ft-lbs.)

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Summary of Contents for NT 65A3

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL FINISH NAILER NT 65A3 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E012 Aug 2003 N MODEL NT 65A3 Hitachi Power Tools ...

Page 2: ...AL 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 Symbols Utilized Competitors Company Name Model Name DEWALT D51256K S ...

Page 3: ...egulations 7 8 MECHANISM AND OPERATION PRINCIPLE 8 8 1 Mechanism 8 8 2 Interchangeability 10 8 3 Operation Principle 14 9 TROUBLESHOOTING GUIDE 20 9 1 Troubleshooting and Correction 20 9 2 Possible Causes and Countermeasures for Air Leakage 23 10 DISASSEMBLY AND REASSEMBLY 25 10 1 General Precautions in Disassembly and Reassembly 25 10 2 Disassembly and Reassembly of the Output Section 26 10 3 Dis...

Page 4: ...current Model NT 65A2 is provided with the contact actuation mechanism only The grip tape wound around the handle of the body was changed to the grip rubber that is common to the Model NR 83A2 The new Model NT 65A3 has the same construction as the current Model NT 65A2 including the well reputed tool less clogged nail release mechanism driving force response and balance 3 APPLICATIONS Finish naili...

Page 5: ...ode No 877153 Pneumatic tool lubricant 4 oz oil feeder Code No 872042 Pneumatic tool lubricant 1 quart can Code No 876212 Grease ATTOLUB No 2 500 g 1 1 lbs Code No 317918 Grease MULTEMP PS No 2 30 g 0 07 lbs Code No 939301 5 SPECIFICATIONS 5 1 Specifications Reciprocating piston type Item Driving system NT 65A3 Applicable air pressure 5 8 5 kgf cm2 gauge pressure 70 to 120 psi 5 2 Nail Selection T...

Page 6: ...TUATION MECHANISM First press the pushing lever against the wood next pull the trigger to drive the nail First pull the trigger next press the pushing lever against the wood to drive the nail After nailing once nailing will not be possible again until the trigger is released and pressed again CONTACT ACTUATION MECHANISM First press the pushing lever against the wood next pull the trigger to drive ...

Page 7: ... allows the nail to be fully driven For example when driving a 65 mm 2 1 2 nail into a hard wood workpiece with the Model NT 65A3 a pressure of about 5 5 kgf cm2 78 psi 5 4 bar allows the nailer to drive the nail flush with the surface A pressure beyond this value causes the nail head to be driven below the wood surface Figure 2 should be used as a reference only because those values vary dependin...

Page 8: ...ir consumption at 7 kgf cm2 100 psi Operating pressure Magazine type Weight Dimensions L x H x W Nail capacity Driving depth adjustment mechanism Handle grip Applicable nails Length Dia 5 to 8 5 kgf cm2 70 to 120 psi 380 mm x 254 mm x 76 mm 14 31 32 x 10 x 3 NT 65A3 1 14 ltr cycle 0 042 ft3 cycle 150 pcs Top loading 2 0 kg 4 4 lbs None Rubber 38 mm to 65 mm 1 1 2 to 2 1 2 1 4 mm to 1 65 mm 16 0 05...

Page 9: ...fety hazards the dangers inherent in the use of any pneumatic tool cannot be completely eliminated Accordingly general precautions and suggestions for the use of pneumatic tools and specific precautions and suggestions for the use of the pneumatic nailer are listed in the Handling Instructions to enhance the safe efficient use of the tool by the customer Salespersons must be thoroughly familiar wi...

Page 10: ...ted in the Handling Instructions provided with each unit While there are no specific safety regulations there are related items in various general safety regulations with which the salespersons should be familiar in order to advise the customer properly Please check your national and or local regulations for applicable items Some applicable items are outlined below The U S A OSHA 1926 102 Eye and ...

Page 11: ...es some parts of the output section were changed Primary differences from the Model NT 65A2 are described below Output section Cylinder Newly designed A hole 1 mm dia was provided to prevent malfunction when selecting the single actuation single sequential actuation mechanism Cylinder spring Newly designed Exhaust valve Newly designed Body An air escape groove was provided at the inmost position o...

Page 12: ...r 9 Lock lever Guide plate Pushing lever Control valve section Exhaust cover Accumulator 1 Air inlet Magazine cover Roll Pin D3 x 16 Magazine assembly Nail feeder Magazine section Grip rubber Driving section Output section Exhaust Valve 2 Trigger Safety valve portion Trigger valve portion Switching device Valve sleeve A Valve bushing Plunger B Control valve section Cylinder Ring Cylinder 6 Nose as...

Page 13: ...o the Model NT 65A3 by mistake Otherwise it may cause a malfunction when selecting the single actuation single sequential actuation mechanism There is no problem in mounting the cylinder for the Model NT 65A3 to the Model NT 65A2 Never mount the cylinder spring for the Model NT 65A2 to the Model NT 65A3 Otherwise the cylinder may not return properly and it may cause a malfunction There is no probl...

Page 14: ...T 65A3 to the Model NT 65A2 NT 65A3 NT 65A2 Body Ass y 19 2 Driving section Parts that were changed for the Model NT 65A3 and not interchangeable with those of the Model NT 65A2 though they are similar to those of the Model NT 65A2 Pushing Lever 65 Part NT 65A3 NT 65A2 Caution Without safety bolt Safety bolt The pushing lever for the Model NT 65A3 is not interchangeable with that of the Model NT 6...

Page 15: ...ctuation single sequential actuation mechanism Do not mount the O ring ID 10 7 for the Model NT 65A3 to the valve bushing of the Model NT 65A2 Otherwise air leakage may occur Valve Bushing 45 Part NT 65A3 NT 65A2 Caution These parts were newly designed to provide the single actuation single sequential actuation contact actuation selector They are not interchangeable Plunger B 52 Parts that were ch...

Page 16: ...B Spring 51 at the Valve Bushing 45 side Thickness 1 mm 10 mm dia 5 3 mm dia Wire dia 1 5 mm Inside dia 6 5 mm Outside diameters at both ends are greater Overall length 18 4 mm Continued 2 The parts of the control valve section except the above are common to those of the Model NT 65A2 6 6 mm dia 8 mm dia 8 mm dia These parts are exclusive to the Model NT 65A3 ...

Page 17: ...When the compressed air source air hose is connected to the nailer Air pressure is applied to the lower surface of the flanges located at the center portion of the Cylinder 6 forcing the cylinder upward The compressed air is thereby blocked from the upper end of the cylinder and no pressure is applied to the piston The Accumulator 1 fills with compressed air The trigger and pushing lever are not o...

Page 18: ...lever are operated simultaneously NOTE If either the trigger or pushing lever are operated individually compressed air will not enter the valve air passage and the nailer will not function When the trigger and pushing lever are operated simultaneously the exhaust vents are closed Compressed air is applied to the upper side of the Exhaust Valve 2 forcing it downward and closing the Exhaust Vent 3 A...

Page 19: ...the position illustrated The lower surface of the Piston 4 contacts the Piston Bumper 9 and prevents air leakage If the upper surface of the Piston Bumper 9 is damaged some air will leak At there is no o ring installed here a very small amount of air will leak from the slight clearance between the components If the operator s grip is loosened air will leak ...

Page 20: ... remaining air pressure at the lower end of the piston is discharged through the clearance between the Piston Bumper 9 and the Driver Blade 7 When the air pressure at the upper side of the piston lowers the air pressure within the Return Air Chamber 8 pushes the piston upward NOTE If the clearance were larger the piston would not return if it were smaller driving force would be decreased When the ...

Page 21: ...evice is set to the single actuation mode the compressed air cannot be released from the upper portion of the piston and the air passage until the trigger is released because the valve exhaust vent II is blocking even if only the pushing lever returns Therefore the piston is kept at the lowermost position and the next nail cannot be driven ...

Page 22: ...itching device is set to the contact actuation mode the compressed air in the upper portion of the piston and the air passage is released from the valve exhaust vent II if the pushing lever returns Therefore the piston returns to the original position and the next nail can be driven Valve Exhaust Vent II ...

Page 23: ...ls Remove the adhesive fragments and apply oil to the nail feeder ribbon spring and the nail rail Magazine is loaded with abnormal nails bent nails large or small head nails abnormal collation etc Magazine is abnormal deformed or damaged Nail feeder is abnormal deformed or damaged Ribbon sping is abnormal deformed or damaged Magazine cover is abnormal deformed damaged or fatigued Check the nail fe...

Page 24: ...ng is abnormal galled or damaged After making idle driving check if the driver blade is kept in the down position Replace the defective part Control valve section Cylinder s external surface sliding surface between the cylinder guide and the clyinder plate is abnormal deposits of dirt or worn Repair or replace Apply grease Replace the head valve spring O ring is worn or oiling is needed Apply grea...

Page 25: ...for 5 to 8 5 kgf cm2 Do not use unspecified workpieces Replace the driver blade Replace the defective part 3 Head of a nail driven into a workpiece protrudes from the wood surface Drive a nail into soft wood workpiece and check if the head protrudes from the wood surface Operate the nailer without nails and check if the driver blade is projected from the nose tip Disassemble the output section and...

Page 26: ... 23 9 2 Possible Causes and Countermeasures for Air Leakage Primary areas of the air leakage Air inlet ...

Page 27: ...ety valve are ON 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 See Parts List and exploded assembly diagram fo...

Page 28: ...iding portions Note that another grease 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 874042 1 quart 1 ltr can Code No 876212 If Gasket B 4 is damaged ...

Page 29: ...sembly procedures in reverse However special attention should be given to the following items Ensure that the Piston 9 is properly engaged in the groove of the Guide Plate 25 Confirm that Plunger B 52 Plunger B Spring 51 and Washer M5 50 have not fallen out and become lost Loosely fasten the Nose Ass y 22 onto Body Ass y 19 with the four Nylock Hex Socket Hd Bolts M5 x 16 24 and fully tighten the ...

Page 30: ...x 20 1 into the provided holes on the Cylinder Plate 12 Gripping these two bolts simultaneously turn and pull upward to remove the Cylinder Plate 12 the Cylinder 13 and the related parts If the Cylinder 13 is difficult to remove as described above remove the Nose Ass y 22 as described in paragraph 10 2 1 and push down on the cylinder to remove it from the lower portion of the main body 2 Piston 9 ...

Page 31: ...side Reassembly of the Piston 9 can be most easily accomplished by inserting the Piston 9 into the Cylinder 13 as illustrated in Fig 13 and inserting the Piston 9 into the grooves on the Guide Plate 25 while pulling the piston out in a downward direction When assembling Gasket B 4 ensure that its air vents are properly aligned with the air vents on the Body Ass y 19 Tighten the four Hex Socket Hd ...

Page 32: ...ig 15 disassemble the Head Cap 7 the Exhaust Valve 6 and Gasket C 5 in that order b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse Ensure that the Hex Socket Hd Botls M5 x 20 1 are properly tightened to specified torque 85 5 kg cm 6 1 0 4 ft lb 3 Head Cap 7 and Exhaust Valve 6 Hex Socket Hd Bolt M5 x 20 1 Hex Socket Hd Bolt M5 x 20 1 Exhaust Cover 3 To...

Page 33: ...the two O rings P 9 46 inside the Valve Sleeve 47 by means of a setting pin with a rounded tip Fig 18 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 41 and Plunger B Spring 51 are small and apt to be twisted and lost Be careful when handling them To prevent the two O ring...

Page 34: ...sher M5 50 Plunger B Spring 51 Valve Sleeve 47 Plunger B 52 Trigger 59 Roll Pin D3 x 30 38 Trigger Plunger 58 Valve Packing 53 Urethane Ball C D7 14 54 Trigger Valve Bushing 57 Valve Bushing 45 Plunger O ring 49 O ring P 9 46 Body Ass y 19 Trigger 59 2 5 mm dia hole Valve Bushing 45 Valve Sleeve 47 Fig 19 Fig 18 ...

Page 35: ...3 x 20 27 with a 3 mm dia roll pin remover and then the Lock Lever 26 can be removed Remove Spring B 28 by hand and pull out the Roll Pin D3 x 30 38 with a 3 mm dia roll pin remover and then the Pushing Lever 65 can be removed b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following items Check that Pl...

Page 36: ... 61 and the Magazine Cover 62 can be removed b Reassembly Refer to Figs 21 22 and 23 Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following points Tighten the Nylock Bolt W Flange M5 x 8 68 and the Nylock Hex Socket Hd Bolt M5 x 12 29 for mounting the Magazine Ass y 63 and the Nose Ass y 22 while pressing the Mag...

Page 37: ... Hex Socket Hd Bolt M5 x 18 31 Washer 32 Handle Arm 61 Nylon Nut M5 60 Magazine Cover 62 Sleeve A 30 Nose Ass y 22 Nylock Bolt W Flange M5 x 8 68 Ribbon Spring 66 Nail Feeder 67 Magazine Ass y 63 Hex Socket Hd Bolt W Flange M5 x 12 69 Fig 21 ...

Page 38: ... 35 Fig 22 Body Ass y 19 Handle Arm 61 Magazine Ass y 63 Nose Ass y 22 No space Nose Ass y 22 Magazine Ass y 63 Fig 23 ...

Page 39: ...not operate just by pulling the Trigger 59 Check that the Model NT 65A3 does not operate just by pressing the Pushing Lever 65 against a test piece wood etc Check that the Model NT 65A3 operates by pulling the Trigger 59 first then pressing the Pushing Lever 65 against a test piece at this time keep the Nail Feeder 67 pulled backward 4 Set the Valve Sleeve 47 to single actuation single sequential ...

Page 40: ...ODEL 10 20 30 40 Fixed Variable NT 65A3 Work Flow Exhaust Cover Gasket x 2 Exhaust Valve Head Cap 60 min 50 Nose Ass y Magazine Ass y Nail Feeder Ribbon Spring Pushing Lever Spring B General Assembly Adjustment Cylinder Body Valve Cylinder Cylinder Plate Cylinder Ring Cylinder Spring Cylinder Guide Cylinder O ring x 3 O ring x 3 Piston Bumper Body Ass y Piston Piston O ring ...

Page 41: ...25 E1 Hitachi Power Tools 1 2 3 4 5 6 7 8 9 1 10 10 18 17 31 32 504 505 33 34 35 16 10 11 12 13 30 29 28 27 26 25 24 23 22 21 20 19 14 15 501 502 503 36 37 53 54 55 56 57 43 58 59 60 61 60 60 60 62 64 63 36 36 69 40 32 65 66 67 38 41 38 39 42 43 44 45 46 47 48 49 50 51 52 68 ...

Page 42: ... Y 1 INCLUD 40 23 949 547 ROLL PIN D4X36 10 PCS 1 24 878 181 NYLOCK HEX SOCKET HD BOLT M5X16 4 25 882 404 GUIDE PLATE 1 26 881 747 LOCK LEVER 1 27 949 685 ROLL PIN D3X20 10 PCS 1 28 877 873 SPRING B 1 29 880 830 NYLOCK HEX SOCKET HD BOLT M5X12 1 30 882 403 SLEEVE A 1 31 949 658 HEX SOCKET HD BOLT M5X18 10 PCS 1 32 876 205 WASHER 2 33 GRIP RUBBER 1 SUPPLIED WITH ITEM NO 601 602 34 877 131 GASKET D ...

Page 43: ...LATE 1 57 877 335 TRIGGER VALVE BUSHING 1 58 878 121 TRIGGER PLUNGER 1 59 876 203 TRIGGER 1 60 877 371 NYLON NUT M5 6 61 882 405 HANDLE ARM 1 62 878 530 MAGAZINE COVER 1 63 878 524 MAGAZINE ASS Y 1 INCLUD 36 60 64 64 949 496 ROLL PIN D3X16 10 PCS 1 65 884 170 PUSHING LEVER 1 66 881 755 RIBBON SPRING 1 67 878 529 NAIL FEEDER 1 68 878 540 NYLOCK BOLT W FLANGE M5X8 1 69 996 399 HEX SOCKET HD BOLT W F...

Page 44: ...ted in Japan 030825N 501 944 458 HEX BAR WRENCH 4MM 1 502 881 751 NOSE CAP A 1 503 875 769 SAFETY GLASSES 1 504 884 180 CAUTION TAG 1 505 884 120 LEAFLET 1 601 881 768 GRIP TAPE A 1 602 880 407 TAPE 2 603 877 153 PNEUMATIC TOOL LUBRICANT 30CC 1 604 874 042 PNEUMATIC TOOL LUBRICANT 120CC 1 605 876 212 PNEUMATIC TOOL LUBRICANT 1L 1 606 317 918 GREASE ATTOLUB NO 2 500G 1 ...

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