HITACHI SB 75 User guide

MODEL SB 75

1. DUST COLLECTION

1-1. Dust Collector

This is a system in which the housing is provided with a dust fan on its side so that air pressure from the dust fan causes grinding dust to be drawn in from the inlet and collected in a dust bag.

1-2. To Maintain Dust Collecting Performance

z#When moist dust is drawn in, the dust collecting section becomes clogged and impairs dust-collecting performance. Instruct the customer to operate the equipment in a dry location as much as possible.

z#A clogged dust bag impairs dust-collecting performance. Instruct the customer to frequently clean the dust bag.

z#Overflow of dust in the dust bag impairs dust-collecting performance. Instruct the customer to empty the dust bag when dust has been collected to about 70% of bag capacity.

1-3. Others

Should sparks created from sanding smolder in the dust bag after sanding a steel plate etc., there is a risk of burning. Instruct the customer to always remove sanding dust from the dust bag.

2.NOTES ON DISASSEMBLY REASSEMBLY

Precautions on operation are given in the instruction manual; the followings are special precautions on disassembly, reassembly, and repair.

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Be sure that the plug is disconnected from the power receptacle during disassembly, reassembly, and polishing belt replacement. When tightening a tapping screw, align the holes on both sides.

2-1. Disassembly (Encircled numbers in the following description

denote item numbers in the Parts Price List.)

(1)Removing the armature assembly 11

z#Remove the belt cover 35 after loosening the belt cover clamping screw (M4 + tapping screw (1pc.)) 36 , and remove the V-belt 34 .

z#By loosening the CB cap 69 , remove the carbon brushes 68 . z#Loosen the dust cover clamping screw (M4 + tapping screw (1pc.)) 41 and the M4 + Hd. machine screws 40 (2pcs.);

then, remove the dust cover 39 and dust guide 38 . z#Finally, loosen the inner cover clamping screws (M5 + tap-

ping screws (4pcs.)) 16 ; then, remove the armature 11 together with the innercover 15 while lightly tapping the armature with a wooden mallet from the pulley (A) 32 side.

(2)Removing the stator 5

z#After removing the armature, detach the handle cover 63

by loosening the handle cover clamping screws (M4 + tapping screws (3pcs.) 41 ).

z#Disconnect the stator lead wires from the terminal on the trigger switch 54 and the connector 60 .

z#After removing the stator’s CB terminal suspended on the CB tube, remove the lead wire 9 and the fan guides (C) 19

(2pcs.) by loosening the M5 + Hd. machine screw 7 (2pcs.); then, remove the stator 5 .

(3)Removing the belt tightener assembly 44 and idle pulley 45 z#After removing the polishing belt, return the lever to its

original position and loosen the M4 + Hd. FT-screws 30

(2pcs.); then, pull out the belt tightener assembly 44 toward the operator.

z#By removing the D10 C-Type retaining ring 48 and the

shaft (B) 47 , the idle pulley 45 can be removed.

(4)Removing the pulley (A) 32 and pulley (B) 33

z#To remove the pulley (A) 32 , first remove the armature and then turn the pulley (A) clockwise with a wrench.

z#To remove the pulley (B) 33 , clamp the drive pulley 22

and then turn the pulley (B) counterclockwise with a wrench.

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