Repair Guide; Precautions On Disassembly And Reassembly; Preparation Before Disassembly - Hitachi NR 1890DC Service Manual

The following describes the most essential precautions on disassembly and reassembly of the nailers.
The cordless strip nailer Models NR 1890DC, NR 1890DBCL, NR 1890DR, and NR 1890DBRL mainly
consist of two sections: the output section and the magazine section.

1. Precautions on disassembly and reassembly

[Bold] numbers in the description below correspond to the item numbers in the parts list and exploded
assembly diagram for the Models NR 1890DC and NR 1890DBCL, and (Bold) numbers to those for the
Models NR 1890DR and NR 1890DBRL.
WARNING: Always remove the battery from the main body before starting repair or maintenance
work. Because the tool is cordless, inadvertently activating the switch with the battery
left in the main body will start the motor rotating unexpectedly, and could cause serious
injury.
1. Removal of the hook
Remove the Hook [57](57) by removing the Low Head Hex. Socket Bolts M4 x 8 [58](58) for easy
disassembly work, although disassembly can be done without removing the Hook [57](57).
2. Removal of housing (C)
• When the nailer is enabled to nail, set MAINTENANCE mode and move the Piston Ass'y [15](15) down to
the bottom dead point referring to "Feeding compressed air" on page 27.
• Remove the Tapping Screw D4 x 20 [44](44) and remove Housing (C) [45](45).
• Remove the Charge Cap [8](8) by using a hexagonal socket wrench.
• Push the valve core to release compressed air as shown below.
Fig. 3
Valve core

REPAIR GUIDE

Preparation before disassembly

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