Disassembly And Reassembly Of The Output Section - Hitachi NR 1890DC Service Manual

Disassembly and reassembly of the output section

1. Removal of the power assembly and wiring
• The nailer has two Housing Set [46](46) halves: housing (A) with a HITACHI logo mark on one side and
housing (B) on the other side.
• For safety, push the valve core once more and check that compressed air is completely released.
• Remove the Hex. Socket Bolt M6 [1](1) and detach the Top Cover [2](2).
• Remove the fourteen Tapping Screws D4 x 20 [44](44) that fasten housing (A) and housing (B).
• Holding the battery portion of housing (B), gently open and remove the Housing Set [46](46).
• Remove the Trigger [54](54) and Spring (T) [53](53) from housing (A).
• Remove Rubber Cushion (A) [18](18) from housing (A).
• Disconnect the connectors of Sensor (B) [63](63), Sensor (C) [60](60), Switch Cable (A) [52](52), and
Wiring [51](51).
• Remove the two O-rings (I.D 2.5) [50](50) from Switch Cable (A) [52](52). Be careful not to lose the
O-rings.
• Carefully lift the Chamber Base [10](10) and Nose [17](17) to remove the power assembly from housing
(A) and Rotor [83](83).
• Remove the Gear Box [82](82) and Bumper (B) [59](59) from the power assembly.
• Firmly hold the stator of the Wiring [51](51) (as the Rotor [83](83) has strong magnetic force), slowly push
the ball bearing (opposite to the pinion) of the Rotor [83](83) in direction "A" to separate the Wiring
[51](51) from the Rotor [83](83) as shown in the figure below.
Fig. 9
Rotor
• Remove the Wiring [51](51) from housing (A).
• Remove Lever (C) [55](55) from Lever (A) [56](56).
• Remove Lever (A) [56](56) from housing (A).
Stator
-12-
A