Repair Guide; Precautions On Disassembly And Reassembly - Hitachi H 45MEY Service Manual

1. Precautions on disassembly and reassembly

WARNING: Be sure to disconnect the power cord plug from the wall outlet before conducting
repair. Otherwise, the motor may run suddenly and you could get injured.
1. Disassembly of the tool retainer
Remove the Front Cap <1> while pulling the Grip <4> in the arrow direction. Note that the Front Cap <1>
is firmly fitted to the Retainer Sleeve <24>. Insert the edge of a flat-head screwdriver or similar tool into
the gap between the Front Cap <1> and Grip <4>, and then pry up the Front Cap <1> by placing the
fulcrum on the Grip <4> as shown below. Then remove the Front Cap <1> from the Retainer Sleeve <24>.
Remove the Stopper Ring <2> by using a retaining ring puller. Then remove the Retainer Washer <3>,
Grip <4>, Retainer Damper (A) <5>, Bit Lock Holder <6>, two Bit Locks <23>, Spring Holder (A) <8>,
Retainer Spring <9>, and Spring Holder (B) <10> from the Retainer Sleeve <24>.
Remove the Stopper Ring <11> by using a retaining ring puller. Then remove the Ball Holder <12>, Grip
(B) <13>, and four Steel Balls D5 <7> from the Cylinder Case <19>.
Flat-head screwdriver
<1>
2. Disassembly of the hammering mechanism
(1) Removal of the second hammer and striker
(a) Remove the Bolt M5 x 12 <14> from the Cylinder Case Cover <15> and detach the Cylinder Case
Cover <15> from the Cylinder Case <19>.
(b) Remove the Bolt M6 x 25 <18> and detach the Cylinder Case <19> from the Crank Case [91]{88}.
(c) Disassembly of the vibration reduciton mechanism (Model H 45MEY only):
Remove the Retaining Ring for D52 Hole [39] by using a retaining ring puller. Then remove the
two Weight Washers [29], two Weight Springs [37], and Weight [38] from the Cylinder Case [19].
NOTE: Be careful not to pop out the Weight Washers [29], Weight Springs [37], and Weight
[38] when removing the Retaining Ring for D52 Hole [39].
(d) Remove the Cylinder <33>, Cylinder Holder <32>, Damper Holder <31>, Damper <28>, Damper
Washer <27>, Damper (C) <30>, and Weight Washer <29> from the Cylinder Case <19>.
(e) Tap the end of the Cylinder <33> with a plastic hammer to pull out the Striker <35>.

REPAIR GUIDE

Disassembly
<4>
-3-
<6>
<23>
<3>
<24>
<2>
<5>
<8>
<9>
<11>
<12>
<7>
<19>
<13>
<10>