Checking After Reassembly; Tightening Torque; Load Current - Hitachi DH 18DPA Service Manual

After reassembly, install the battery in the tool body and check the following.
(1) Check that the LED light turns on while pulling the switch and automatically turns off in about ten seconds
when you release your finger from the switch.
(2) Insert the SDS-plus bit into the Cylinder [20]{20} and pull the switch to check that the SDS-plus bit
rotates in the direction as indicated on Pushing Button (B) [60]{60}. When you press the "R" side of
Pushing Button (B) [60]{60}, the SDS-plus bit rotates clockwise as viewed from the rear of the tool body.
(3) Insert the SDS-plus bit into the Cylinder [20]{20} and hold the tip of the SDS-plus bit with a vise. Holding
the handle and the side handle securely, pull the switch to check that the slip clutch operates.
(4) Check that the Change Lever [11]{11} turns smoothly and the operating mode properly switches between
"Rotation only" (
Change Lever [11]{11}.
• Tapping Screw (W/Flange) D4 x 30 (Black) [8]{8} ····························· 2.0±0.5 N•m (20±5 kgf•cm)
• Machine Screw M4 x 5 [14]{14} ···················································· 0.8±0.2 N•m (8±2 kgf•cm)
• Seal Lock Hex. Socket Hd. Bolt M5 x 14 [34]{34} ······························ 5.9 to 7.3 N•m (60 to 75 kgf•cm)
• Tapping Screw (W/Flange) D4 x 20 (Black) [40]{40} ·························· 2.0±0.5 N•m (20±5 kgf•cm)
No-load current should be as follows using a fully charged battery after no-load operation for five minutes in
"Rotation + Hammering" mode.
• DH 18DPA: 5.6±1.0 A
• DH 12DD: 11.1±2.0 A

Checking after reassembly

mark) and "Rotation + Hammering" (

Tightening torque

No-load current
mark) according to the operation of the
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