Hitachi DH 12DD, Service Manual

-6- 

Fig. 7 • Reassembly of the second shaft ass’y (1) 

Fig. 8 • Reassembly of the second shaft ass’y (2) 

3. Reassembly of the second shaft ass’y

NOTE: Use the special repair tool specified in the 

table for reassembly of the second shaft 
ass’y. 

(1) Mount the Clutch 

[44]{44}

, Reciprocating Bearing 

[45]{45}

, Needle Cage 

[46]{46}

, and Thrust Washer 

(C) 

[47]{47}

 on Second Shaft (A)

 [43]{43}

. Then, mount the Bevel Gear 

[48]{48}

 and the J-408 bevel 

gear jig on Second Shaft (A)

 [43]{43}

 as shown in Fig. 7. Push Second Shaft (A)

 [43]{43}

 with a hand 

press until the end of Second Shaft (A)

 [43]{43} 

contacts the end of the J-408 bevel gear jig. Then, 

remove the J-408 bevel gear jig and mount it in reverse direction as shown in Fig. 8 and push Second 
Shaft (A)

 [43]{43}

 with a hand press until the end of Second Shaft (A)

 [43]{43} 

contacts the end of the 

J-408 bevel gear jig.

NOTE: After reassembly of the second shaft ass’y, check the following. 

• Check that the Reciprocating Bearing [45]{45} rotates around Second Shaft (A) [43]{43} 

smoothly. 

• Check that the Reciprocating Bearing [45]{45} has an appropriate clearance by moving 

it back and forth. 

Special repair tool 

Code No. 

J-408 

Bevel gear jig 

376748 

J-408 bevel gear jig 

[47]{47} 

[45]{45} 

[48]{48} 

[44]{44} 

[46]{46} 

End of 

[43]{43} 

Hand press 

J-408 bevel gear jig 

End of 

[43]{43} 

Hand press 

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