Alpha Tool.Com.HK Limited Grinder ECG125 User Manual

21
3.  Using small needle nose pliers, gently pull the carbon brush holder stra\
ight out from 
the motor housing. After removing the carbon brush holder from the motor housing, 
you need to remove the power wire terminal from the carbon brush holder \
(Note: the 
path of the wire, as it is important for reassembly of the unit).  The carbon brush holder 
assembly is now free from the machine and can be inspected.
 
4.  Pictured on the left below, is a worn carbon brush in the holder (Note: the twisted...

22
5.  The carbon brush can be removed from the holder by pulling back the carbon brush 
spring and moving it to the side as shown in the photo on the left below\
.  After reas-
sembly, press the carbon brush in and out of the holder to make sure it moves freely and 
the twisted wire is not hitting the wire terminal or spring (see photo \
below on right).
 
6.  Remove the old carbon brush and disconnect the wire terminal. If the ins\
ide of the 
holder	 is	filled	 with	dust,	 clean	 it	before	 installing...

23
9.  To clean the commutator, press the commutator cleaning stone against the commutator 
and rotate the armature by turning the spindle shaft by hand. Continue for a minute 
or until the commutator is clean and shiny.
10.	 Reconnect	 the	power 	wire,	 insuring	 that	the	 wire	 path	 is	correct	 (See	figure	 15),	Re-
install the carbon brush holder into the slot on the motor housing and slide in until the 
screw tab hits the stop, then install the screw using light pressure to prevent it from...

GRINDING WHEEL INSPECTION, REMOVAL, AND 
INSTALLATION
 
  DANGER!
Be sure to unplug the power cord from the outlet before attaching or removing the grinding 
wheel from the tool.  Accidental starting of the motor may cause bodily injury.
 
  WARNING!
Be	sure	 to	securely	 tighten	the	flange	 assembly	 and	all	loose	 screws	 before	testing	 the	unit. 		
Please allow the grinding wheel to do the work.  It is not necessary to \
apply more force onto 
the machine than the force created by the weight of the...

   CHECKING THE GRINDING WHEEL FOR REPLACEMENT
1.	 The	grinding	wheel	and	spring	 loaded	 flange	are	designed	 to	be	 self-adjusting.		 The	
grinding 	wheel	 should 	float 	on 	the	 flange	 nut	allowing	 it	to 	adjust 	to 	the	 height 	of 	the 	
brush assembly.
2.  The grinding wheel should be replaced when the diamond segments are worn down 
close to the hub and there are no visible diamond chips.
3.  You also need to check the grinding wheel and diamond segments for chips, cracks 
in the welds, or...

26
Figure-25
Figure-26
Spindle Lock Button
Loosening the Flange Bolt
  REMOVING THE GRINDING WHEEL
1.  While pressing in on the spindle lock button, turn the grinding wheel by hand until the 
lock can fully engage.
 
2.	 With	 the	lock	 fully	 engaged,	 turn	the	flange	 bolt	counter	 clockwise	 to	loosen	 the	flange 	
bolt	with	the	flange	wrench.
 
3.	 If	 the	grinding	 wheel	is	turning	 during	removal,	 then	the	flange	 nut	is	unscrewing	 off	the 	
spindle.	 Remove	 the	complete	 flange	assembly.		 With...

27
  REPLACING THE GRINDING WHEEL
1. To replace the grinding wheel follow the steps for removing the grinding wheel (see 
page	26).		After	 the	grinding	 wheel	is	removed,	 you	need	 to	remove	 the	three	 flat-head 	
screws holding the drive plate adapter onto the diamond grinding wheel.
Note: When you purchase a replacement Grinding Wheel (Part # DSQ0500), it does not come 
with the  Drive Plate Adapter (Part # 801381) or Flat Head Screws (Part # 801382).  
These parts need to be ordered separately or...

28
  INSTALLING THE SPRING LOADED FLANGE ASSEMBLY
NOTE:	This	unit	comes	 equipped	 with	a	self-adjusting	 spring	loaded	 flange	assembly.		 This	
flange	 assembly	 allows	the	grinding	 wheel	to	adjust	 as	it	wears	 to	keep	 positive	 contact	
with the work.
1.	 With	 the	inner	 fan	belt	 and	 cover	 installed,	 you	can	now	 install	 the	spring	 loaded	 flange	
and grinding wheel.
2. Install the lower spring retainer, spring, and upper spring retainer.
  
Note: The Spring Loaded Flange Assembly only works...

29
Flange Bolt
Grinding 
Wheel
Figure-30
Figure-31
Figure-32
Grinding Wheel and Flange Bolt
Spindle Lock Button
Tighten the Flange Bolt
  INSTALLING THE GRINDING WHEEL
1.	 Place	the	grinding	wheel	and	flange	bolt	on	the	spindle.
 2. While pressing in on the spindle 
lock button, turn the grinding wheel 
by hand until the lock is fully en-
gaged.
3.  With the lock fully engaged, turn the 
flange	 bolt	clockwise	 to	tighten	 with	
the	flange	wrench.
 
4.	 With	 the	flange	 bolt	and	nut		tightened,	 check...

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FAN BELT REMOVAL AND REPLACEMENT
The Ecogrinder incorporates two drive fan belts (an inner and an outer)\
 to power the fan 
assembly.  If the unit is not removing the dust, you will need to inspect the fa\
n belts, fan 
assembly,	and	dust	bag	to	find	the	cause	of	the	problem.
NOTE:	This	Ecogrinder	 makes	use	of	a	flat	 fan	belt	 and	 pulley	 system	 that	is	self-centering 	
due to the barrel shape of the pulleys.  If the fan belt is worn or dirty it can rotate\
 off 
the pulleys, this will be...