Makita Gas nailer GN900SE Technical Information Download

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[3] DISASSEMBLY/ASSEMBLY
[3]-5. DC motor and Spark plug

DISASSEMBLING

(1) Separate Handle set from Housing as illustrated in

Fig. 2

(2) Disconnect Spark plug and DC motor from Spark unit and Terminal as illustrated in

Fig. 23

(3) DC motor can be removed from Cylinder head as illustrated in

Figs. 24

and

Remove Plug cap from Spark plug.

1. Remove Spark plug with 8mm box wrench.
2. Disconnect Earth terminal
3. Disconnect Connectors of DC motor.

Plug cap

Spark plug

O ring 10

Connectors

Earth terminal

M4x8 Pan head screw

Fig. 23

Fig. 24

Fig. 25

Remove Fan 60 by unscrewing M3x4 set screw.

Remove Retaining ring R-24 with 1R291 while passing
Motor’s lead wires through the Retaining ring.

Fan 60

Motor sleeve

M3x4 Set screw

DC motor

Flat washer 10, Conical
compression springs 12-18,
DC Motor and Motor sleeve
can be removed from Cylinder
head.

Flat washer 10

Steel ball 3

Conical
compression
spring 12-18

Flat washer 10

Conical compression spring 12-18

Retaining ring R-24

DC motor

Pull Lead wires of DC motor through
Flat washer 10 and Conical compression
spring 12-18.
And remove Epoxy washer 2 from
Motor shaft.

Epoxy washer 2

Summary of Contents for Gas nailer GN900SE

Page 1: ...gle Optional accessories Nail fuel pack Fuel cell Cleaner kit contains the following accessories in a special Tool bag Cleaner 1 Lubricating oil 1 Hex wrench 4 1 Brush 1 Cotton waste 1 Charger DC07SA Charger DC10WA Battery BL7010 7 2 1 0 30 with DC07SA DC10WA Li ion Charging time approx min Battery Yes Anti dry fire mechanism Cell Voltage V Capacity Ah Battery life 4 Fuel cell life 5 4 000 nails a...

Page 2: ...Hex socket head bolt 1R268 Spring pin extractor 3 Disassembling Assembling Spring pin 3 32 1R291 Retaining ring S and R pliers Disassembling Assembling Retaining ring R 24 Item No Apply a little amount of Lubricant and Adhesives illustrated in Fig 1 Description Portion to lubricate Lubrication Lubrication oil VG100 Lubrication oil VG100 Molybdenum disulfide a Inside with which Driver complete cont...

Page 3: ... 60 Handle set Top cap Cylinder head Fan 60 M5x35 Hex socket head bolt 2pcs M5x25 Hex socket head bolt 4pcs Housing 1 Disassemble Driver complete as illustrated in Figs 2 and 3 Fig 2 Fig 3 Sleeve 8 cylinder 1R005 Driver complete Retaining ring INT R 58 on Cylinder 3 While holding Piston ring 2pcs with the slotted screwdriver to prevent them from being caught in the groove for Retaining ring INT R ...

Page 4: ...ylinder section Front cushion hammer more than 90 degrees Assemble Piston ring 2pcs to Driver complete so that the angle of their slits is more than 90 degrees slit slit slit slit Cylinder Driver complete Fig 5 Fig 6 Contact top Contact top Use slotted screwdriver to prevent Piston rings from being caught in the groove of Cylinder for Retaining ring INT R 58 Refer to Fig 3 Set Driver complete in p...

Page 5: ...ssemble Exhaust cover Silencer and Exhaust valve Silencer frame on Cylinder frame on Cylinder frame on Cylinder Exhaust plate It causes the wrong driving like dry fire and the leakage of gas Note It is possible that the tip of Driver complete does not hit the nail head in use because of the corrosion of adhesive even if Exhaust valve and Exhaust plate do not look deformed damaged Scrape away the a...

Page 6: ...te protrusions of Exhaust plate Exhaust plate M4x10 Hex socket head bolt 2pcs M4x10 Hex socket head bolt 2pcs Exhaust valve Exhaust valve Set Exhaust valve and Silencer in place Tighten Exhaust cover with M4x10 Hex socket head bolt 2pcs Silencer Exhaust cover Fig 11 Fig 12 Punching metal frame of Cylinder 1 Use slotted screwdriver to scrape away adhesive left on the frame on Cylinder Note The inco...

Page 7: ...connector While opening Arm s ends pull Arm in the direction designated with black arrow M4x16 Hex socket head bolt 4pcs Remove Chamber top and Chamber seal ring from Chamber Chamber top Cylinder Cylinder Chamber Pull Chamber carefully so that Compression spring 8 does not spring out of Cylinder Remove these Spring pin3 32 2pcs for joining Cylinder section and Chamber Spring pin 3 32 2pcs Compress...

Page 8: ...in Fig 14 4 Assemble Stop rubber and Compression spring 8 to Cylinder Refer to the right illustration in Fig 13 5 Applying Molybdenum disulphide lubricant to the outside of Cylinder Fig 1 insert it into Chamber Refer to right illustration in Fig 13 6 Connect Cylinder with Chamber as illustrated in Fig 16 Fig 15 Fig 16 Spring Pin 3 32 Water pump pliers Insert Spring pin 3 32 for approx 5mm depth wi...

Page 9: ...e set R Sliding Pusher lever toward the rear side insert Screwdriver to stop Pusher lever s return Remove Lock bar and compression spring 4 Lock Bar Pusher lever Compression spring 4 1 Separate Handle set from Housing as illustrated in Fig 2 2 Handle set L can be separated from Handle set R as illustrated in Fig 17 And remove Lock bar and Compression spring 4 as illustrated in Fig 18 Magazine supp...

Page 10: ...Pan head screw Remove Pusher Pusher holder Compression and spring 4 from Pusher lever by unscrewing M4x20 Pan head scerw Remove Spiral spring complete from Drum portion of Pusher lever Pusher Handle set L Spiral spring complete Pusher holder Lock claw of Spiral spring Pusher lever Pusher Lever Compression spring 3 Drum portion Fig 19 Fig 20 Hook holder Hook Lead wire cover Spark unit Switch Unit C...

Page 11: ...t portion to Under driver guide assemble Nail plate Facing the tab to Under driver guide assemble Nail rail cut portion of Nail plate Pusher holder M4x20 Pan head screw Fig 21 Fig 22 1 Assemble Pusher section as illustrated in Fig 21 2 Referring to Fig 18 assemble Lock bar and Compression spring 4 to Handle set L 3 Assemble Nail feeding section as illustrated in Fig 22 4 Referring to Fig 20 assemb...

Page 12: ...g 10 Connectors Earth terminal M4x8 Pan head screw Fig 23 Fig 24 Fig 25 Remove Fan 60 by unscrewing M3x4 set screw Remove Retaining ring R 24 with 1R291 while passing Motor s lead wires through the Retaining ring Fan 60 Motor sleeve M3x4 Set screw DC motor Flat washer 10 Conical compression springs 12 18 DC Motor and Motor sleeve can be removed from Cylinder head Flat washer 10 Steel ball 3 Conica...

Page 13: ...ther Conical compression spring 12 18 into Motor box as illustrated above Assemble DC motor covered with Motor sleeve while paying attention to the descriptions in Fig 27A Conical compression spring 12 18 DC motor 1 Assemble DC Motor to Cylinder head as illustrated in Figs 26 27 and 27A Top view of Cylinder head and DC motor Epoxy washer 2 Protrusion of Motor sleeve Steel ball 3 Groove of Motor bo...

Page 14: ...erminal to Cylinder head Assemble O ring 10 and Spark plug to Cylinder head Refer to the right illustration in Fig 23 6 Connect plug cap to Spark plug Refer to the left illustration in Fig 23 7 Assemble Handle set to Housing Refer to Fig 2 4 How to check of Spark and DC motor 1 Separate Handle set from Housing as illustrated in Fig 2 And Disassemble Handle set L as illustrated in Fig 17 2 Remove F...

Page 15: ... blinking orange Melting a part of Switch in Contact arm Disconnection of Trigger switch Returning Contact arm incompletely 1 Melting a part of Switch in Contact arm Melting a part of Trigger switch Returning Trigger incompletely 2 Possible electrical malfunction Possible mechanical malfunction Melting a part of Switch in Contact arm Returning Contact arm incompletely 3 Melting a part of Trigger s...

Page 16: ...een Switch unit and boss Put lead wire black of Spark plug between rib and boss Switch unit for DC motor Switch unit for trigger Connector Connector to DC motor Wire connecting portion Spark unit Pay attention not to put lead wires on the rib in this area Line filter When putting the following lead wires into lead wire holders do not cross them in this area lead wire red to DC motor lead wire blac...

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Makita Gas nailer GN900SE, Technical Information

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