Reassembly - Hitachi G 10SR2 Service Manual

8-2. Reassembly

Put the parts together in the reverse order of disassembly, with the precautions given below.
(1) Generously lubricate the teeth of Gear [20] and Pinion [6] with grease. Rub grease onto the teeth with your
fingers so that the grease reaches each tooth bottom. Note that the Gear [20] and the Pinion [6] may wear at
a faster rate if under-lubricated.
(2) Be sure to soak the inner diameter of the Felt Packing [24] with machine oil. Otherwise, its dust-sealing
function will fail to work properly, resulting in an earlier damage of the Ball Bearing [23].
(3) When replacing the Armature [10] and the Ball Bearing [15] on the commutator side, press inward on the Dust
Seal [14] while taking care of its direction until the end face of the Dust Seal [14] hits against the a butting
surface of the Armature [10] and make sure that Dust Seal [14] cannot turn freely. Keep the end face of the
armature shaft approximately 0.2 mm (reference) distance inward of the end face of the Ball Bearing [15].
(See Fig. 7.)
The Dust Seal [14] is an important element for improved dust protection of the Ball Bearing [15]. Be sure to
use a new one upon replacement.
Fit the Rubber Bushing [16] into the housing ball bearing chamber before installing the Armature [10].
(See Fig. 8.)
Housing ball bearing chamber
About 0.2 mm (reference)
Armature shaft
Ball Bearing [15]
Dust Seal [14]
Fig. 7
--- 9 ---
Rubber Bushing [16]
About 4.5 mm
Fig. 8