Hitachi H 60MA Repair Manual page 3

• Lubrication
Apply special grease (grease for electric impact drills) to the inner circumference of the Connecting Rod
[36], O-Rings (A) [33] in the Striker [32] and in the Piston [35], the outer circumference of the Retainer
Sleeve [19], the sliding portion of the Second Hammer [24], the Oil Seal [48], the Damper [26], Damper
(B) [22], the Damper Washer [27] and the outer polished surface of the Ball Holder [12]. Seal 60 g of
the special grease into the Crank Case [38] (Connecting Rod [36] side). Apply Hitachi Motor Grease
No. 29 to Needle Bearing (A) [55], the pinion portion of the Armature Ass'y [65], the Steel Ball [16] and
the Needle [8]. Seal 40 g of the Hitachi Motor Grease No. 29 into the Crank Case [38] (First Gear [54]
side).
• Oil seals
Be very careful not to damage the O-Ring [42] in the Crank Cover [41], O-Rings (A) [33] in the Striker
[32] and in the Piston [35], the Oil Seal [48] in the Crank Case [38], the O-Ring [31] on the Cylinder
Case [29], the O-Ring [28] on the Front Cover [18], the O-Ring [20] in the Retainer Sleeve [19], and X-
Ring [21].
• Reassembly of the variable lock mechanism (See Fig. 5.)
D2.6 Hole
Retaining ring
Arrow mark
Mount the Front Cover [18] to the Cylinder Case [29] positioning the D 2.7 hole to the top. Turn the
Retainer Sleeve [19] so that the Steel Ball [16] is inserted in the D 6.5 hole of the Front Cover [18] to the
deepest position. Fix the Steel Ball [16] in the D 6.5 hole with grease. Insert the A portion of Spring
(B) [14] in the D 2.7 hole of the Front Cover [18], and then fit the B portion in the D 4.8 hole of Grip (B)
[13]. Turn Grip (B) [13] about 40˚ in the arrow direction while pressing against the Cylinder Case [29].
Holding this arrangement, insert the Ball Holder [12] into Grip (B) [13] so that the B portion of Spring
(B) [14] is inserted in the D 2.6 hole of the Ball Holder [12], and fix them with the Retaining Ring [11].
Check that Grip (B) [13] goes back to the original position by itself when turning Grip (B) [13] 6˚ in the
arrow direction and releasing the hand.
Ball holder
Grip (B)
D4.8 Hole
B
Spring (B)
Retainer sleeve
A
D6.5 Hole
Front cover
Fig. 5
--- 3 ---
Steel ball (4 pcs.)
D2.7 Hole
Cylinder case