Disassembly And Reassembly Of The Arm - Hitachi CM 75EAP Service Manual

16. Disassembly and reassembly of the arm

[Tools required]
• Hex. bar wrench (4 mm)
• Pliers
• Round bar about 15 mm in diameter
• Round bar about 17 mm in diameter
(1) Disassembly
• Remove the Retaining Ring [52] by using pliers.
• Push a round bar about 15 mm in diameter towards the Spindle [84] from the Arm Plate [67] side to
remove a set of the Spindle [84], two Ball Bearings 6203DD [53], and BB Collar [54] from the Arm
[63].
• Remove the two Ball Bearings 6203DD [53] and BB Collar [54] from the Spindle [84].
• Remove the Felt [55] from the Arm [63].
• Loosen the Bolt M5 x 12 [62] by using a hex. bar wrench (4 mm), and remove the Stopper Holder [64]
and Stopper Rubber [65].
• Loosen the four Bolts M5 x 12 [68] by using a hex. bar wrench (4 mm), and remove the Arm Plate [67]
and the four Collars [66].
(2) Reassembly
Reassembly can be conducted by reversing the disassembly procedure. However, special attention
should be given to the following items.
• Do not reuse the removed Ball Bearings 6203DD [53] (2 pcs.).
• Mount the Felt [55], Ball Bearing 6203DD [53] (felt side), BB Collar [54], Ball Bearing 6203DD [53]
(retaining ring side), Spindle [84], and Retaining Ring [52] to the Arm [63] in this order.
NOTE:
• Push the outer ring of Ball Bearing 6203DD [53] to press-fit it into place.
• When press-fitting the Ball Bearing 6203DD [53] (retaining ring side), insert a round bar
about 17 mm in diameter into the BB Collar [54] and Ball Bearing 6203DD [53] (felt side) to
prevent the BB Collar [54] from becoming misaligned.
• When press-fitting the Ball Bearing 6203DD [53] (retaining ring side), immediately stop
press-fitting when the ball bearing contacts the BB Collar [54]. Note that excessive
press-fitting will apply shearing force to the inner and outer rings of the ball bearing.
• Hold the inner ring of the Ball Bearing 6203DD [53] (retaining ring side) when press-fitting
the Spindle [84].
• Firmly fit the Retaining Ring [52] into the ring groove of the Arm [63].
• Arm
[52]
[53]
[54]
[53]
[55]
[63]
-24-
[62]
[58]
[84]
[64]
[65]
[66]
[68]
[67]